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HomeMy WebLinkAbout23SITE1 689OCR StrmRep Rev 021323 Rec 021623 CONTENTS 1.0 PROJECT OVERVIEW 2.0 DRAINAGE ANALYSIS 2.1 DRAINAGE DESIGN PARAMETERS 2.1.1 Watersheds 2.1.2 Soils 2.1.3 Rainfall Data 2.1.4 Runoff Curve Numbers 2.2 EXISTING CONDITIONS 2.2.1 Table A – Existing Conditions Hydrology 2.3 DEVELOPED CONDITIONS 2.3.1 Table B – Developed Conditions Hydrology 3.0 HYDROLOGIC CALCULATIONS 3.1 Stormwater Management – Supplemental Information • Northeast Regional Climate Center: Extreme Precipitation Table • NRCS: Web Soil Survey • Test Pit Logs • % Impervious Coverage/ Storm Water Quality Volume (WQV) and Sediment Forebay Calculations 3.2 Existing Watersheds • Pre-Development Plan • Drainage Diagram / Area and Soil Listings • HydroCAD Node and Storm Summary Output 3.3 Developed Watersheds • Post-Development Plan • Drainage Diagram / Area and Soil Listings • HydroCAD Node and Storm Summary Output 1.0 PROJECT OVERVIEW This report is a hydrologic water quantity quality analysis of the subject parcel located on 689 Old Colchester Road in Uncasville, CT. The 8.3-acre property is identified as Tax Map 30, Block 89, Lot 00A. The lot consists of five (5) existing utility buildings, twelve (12) concrete pads for various utilities and an access driveway. There are no wetlands associated with the site. No portion of Tax Map 30, Block 89, Lot 00A is within the flood plain. In addition to the buildings, the site consists of pavement, gravel, grass/open field, and woodland. Redevelopment of the site proposes the construction of a 912 s.f office building and associated site improvements including parking, grading, utilities, and other appurtenances, as well as a stormwater management basin. To effectively analyze the pre-development conditions, a 55,644 s.f. watershed was created, with two (2) sub-catchments, while off-site runoff accounts for 4,166 s.f. from an adjacent property. The sub-catchment is routed through site prior to discharge. The points of discharge are identified as Design Point A (DPA) and Design Point B (DPB). DPA is located at the property line south of the development area, DPB is located near the front gate. To effectively analyze the post-development three (3) sub-catchments were created. The pre- and post-development watersheds are routed to the same points of analysis. Sub- catchments model the areas of the site that are directed through proposed drainage basin. Water Quality Volume was calculated to be 550.67 c.f., resulting in a WQV Elevation of 461.29, an elevation just below the outlet weir slot elevation. A sediment forebay of 137.67 c.f. is required with this WQV. The project proposes an infiltration basin with a storage volume of 1,015 c.f. ±, including above and below ground storage, sediment forebay storage volume of 369 c.f. ±, and three (3) 8” perforated pipes with a storage volume of 44 c.f., resulting in a total available storage of 1,427 c.f. Stormwater conveyance consists of overland flow to the bioretention basin. The basin utilizes open storage, infiltration of water into the ground and controlled outflow. An outlet structure for the basin consists of a sharp crested custom weir which discharges limited runoff in all design storms into a rip-rap splash pad that leads to a concrete level spreader upgradient of the property line. The custom weir consists of a 3” x 11” slot that regulates the flow. A 24” diameter Nyloplast-type dome grate has been proposed with three (3) 8” perforated underdrains. This structure will ensure that if the water is not infiltrating through the top planting mix (bio mix), for example in certain winter conditions, then runoff in the basin pond up to the rim and then route to the underdrains below to infiltrate through the stone layer surrounding the underdrains. The analysis shows that with the mitigation measures proposed for the development of this site, the post-development conditions will improve over existing conditions in that stormwater flow rates and runoff volumes to the adjacent properties will be reduced for all design storms. 2.0 DRAINAGE ANALYSIS A comprehensive hydrologic study of this site has been performed utilizing nationally recognized runoff estimating techniques developed by the USDA, Soil Conservation Services (SCS). The technique and runoff models are described in various SCS publications and references as follows: TR-55/ TR-20 Methodology using “Stormwater Modeling System” HydroCAD Ver. 10.0 “Extreme Precipitation Tables; Northeast Regional Climate Center” 2.1 DRAINAGE DESIGN PARAMETERS A brief review of the procedures and parameters used in the drainage study follows: 2.1.1 Watersheds The watersheds and sub-catchment areas were delineated using on-site topographic survey data provided by North by Northeast Survey and Mapping Consultants. 2.1.2 Soils Natural Resources Conservation Services (NRCS) web soil survey shows the site as Woodbridge, with the surrounding area indicated as having a hydrologic soil grouping (HSG) of C. From test pits performed on site, the texture class of the underlying native soil that will receive recharged water was determined to be Loamy Sand. Accordingly, a Rawls infiltration rate of 2.41 Inches/Hour was utilized for exfiltration and recharge calculations. 2.1.3 Rainfall Data Extreme precipitation estimate values from the Northeast Regional Climate Center were utilized in this analysis. The analysis has been performed for the 2-year, 10- year, 25-year, 50-year, and 100-year storm events with 3.35”, 4.83”, 5.95”, 6.98”, and 8.18” rainfall depths respectively. 2.1.4 Runoff Curve Numbers The SCS runoff curve numbers were used for the various land uses and are summarized within each sub-catchment drainage summary in the hydrologic calculations. 2.2 EXISTING CONDITIONS For purposes of this analysis the subject parcel was analyzed as one point of discharge. 2.2.1 Table A – Existing Conditions (2, 10, 25, 50 and 100-year storm events) Watershed Pre Development Peak Flows (cfs) Design Point 2-yr 10-yr 25-yr 50-yr 100-yr A 0.95 1.76 2.40 3.02 3.74 B 0.88 1.53 2.01 2.49 3.02 Watershed Pre Development Peak Volume (cf) Design Point 2-yr 10-yr 25-yr 50-yr 100-yr A 3,745 6,946 9,562 12,055 15,033 B 3,206 5,656 7,614 9,462 11,652 2.3 DEVELOPED CONDITIONS The post development watershed was analyzed utilizing the same summing points as the pre development analysis. 2.3.1 Table B – Developed Conditions (2, 10, 25, 50 and 100-year storm events) Watershed Post Development Peak Flows (cfs) Design Point 2-yr 10-yr 25-yr 50-yr 100-yr A1 0.88 1.61 2.18 2.73 3.36 B1 0.73 1.19 1.62 2.13 2.69 Watershed Post Development Peak Volume (cf) Design Point 2-yr 10-yr 25-yr 50-yr 100-yr A1 3,396 6,218 8,510 10,690 13,288 B1 2,636 4,841 6,742 8,556 10,680 HYDROLOGIC CALCULATIONS 3.1 STORMWATER MANAGEMENT – SUPPLEMENTAL INFORMATION Extreme Precipitation Tables Northeast Regional Climate Center Data represents point estimates calculated from partial duration series. All precipitation amounts are displayed in inches. Smoothing No State Connecticut Location Longitude 72.155 degrees West Latitude 41.453 degrees North Elevation 0 feet Date/Time Wed, 28 Dec 2022 12:24:29 -0500 Extreme Precipitation Estimates 5min 10min 15min 30min 60min 120min 1hr 2hr 3hr 6hr 12hr 24hr 48hr 1day 2day 4day 7day 10day 1yr 0.31 0.48 0.58 0.78 0.96 1.17 1yr 0.83 1.14 1.37 1.75 2.23 2.80 3.06 1yr 2.48 2.94 3.40 4.10 4.72 1yr 2yr 0.37 0.57 0.70 0.95 1.18 1.42 2yr 1.02 1.39 1.63 2.11 2.66 3.35 3.67 2yr 2.97 3.53 4.02 4.79 5.40 2yr 5yr 0.44 0.68 0.84 1.16 1.47 1.77 5yr 1.27 1.73 2.02 2.60 3.23 4.13 4.57 5yr 3.65 4.40 5.04 5.90 6.66 5yr 10yr 0.51 0.78 0.97 1.35 1.74 2.08 10yr 1.51 2.04 2.36 3.05 3.75 4.83 5.41 10yr 4.28 5.20 5.98 6.92 7.82 10yr 25yr 0.61 0.94 1.16 1.66 2.18 2.59 25yr 1.89 2.53 2.92 3.77 4.57 5.95 6.75 25yr 5.27 6.49 7.52 8.55 9.66 25yr 50yr 0.71 1.08 1.34 1.93 2.60 3.05 50yr 2.24 2.99 3.43 4.42 5.32 6.98 7.99 50yr 6.17 7.68 8.94 10.04 11.34 50yr 100yr 0.82 1.24 1.56 2.25 3.09 3.61 100yr 2.67 3.53 4.03 5.20 6.19 8.18 9.46 100yr 7.24 9.10 10.64 11.79 13.32 100yr 200yr 0.96 1.44 1.82 2.64 3.68 4.26 200yr 3.17 4.17 4.73 6.12 7.21 9.60 11.21 200yr 8.50 10.78 12.68 13.86 15.66 200yr 500yr 1.17 1.75 2.25 3.26 4.64 5.32 500yr 4.01 5.20 5.87 7.60 8.83 11.87 14.05 500yr 10.50 13.51 15.99 17.17 19.40 500yr Lower Confidence Limits 5min 10min 15min 30min 60min 120min 1hr 2hr 3hr 6hr 12hr 24hr 48hr 1day 2day 4day 7day 10day 1yr 0.26 0.41 0.50 0.67 0.82 0.97 1yr 0.71 0.95 1.16 1.53 2.02 2.35 2.85 1yr 2.08 2.74 3.21 3.84 4.43 1yr 2yr 0.36 0.55 0.68 0.92 1.14 1.37 2yr 0.98 1.34 1.59 2.06 2.59 3.28 3.59 2yr 2.91 3.45 3.93 4.70 5.29 2yr 5yr 0.40 0.62 0.77 1.06 1.35 1.62 5yr 1.16 1.58 1.89 2.41 3.00 3.90 4.33 5yr 3.45 4.16 4.76 5.58 6.31 5yr 10yr 0.44 0.68 0.84 1.18 1.52 1.81 10yr 1.31 1.77 2.08 2.73 3.36 4.45 4.97 10yr 3.94 4.78 5.47 6.37 7.24 10yr 25yr 0.50 0.75 0.94 1.34 1.76 2.11 25yr 1.52 2.06 2.42 3.21 3.93 5.28 6.00 25yr 4.67 5.77 6.59 7.59 8.65 25yr 50yr 0.53 0.81 1.01 1.46 1.96 2.45 50yr 1.69 2.40 2.72 3.65 4.42 6.03 6.93 50yr 5.34 6.66 7.62 8.69 9.92 50yr 100yr 0.59 0.89 1.11 1.61 2.20 2.62 100yr 1.90 2.56 3.07 4.17 4.98 6.89 8.02 100yr 6.10 7.71 8.83 9.97 11.39 100yr 200yr 0.64 0.96 1.22 1.76 2.46 2.91 200yr 2.12 2.85 3.44 4.77 5.63 7.90 9.29 200yr 6.99 8.93 10.22 11.46 13.10 200yr 500yr 0.72 1.07 1.37 2.00 2.84 3.90 500yr 2.45 3.81 4.02 5.72 6.63 9.48 11.32 500yr 8.39 10.89 12.47 13.82 15.77 500yr Upper Confidence Limits 5min 10min 15min 30min 60min 120min 1hr 2hr 3hr 6hr 12hr 24hr 48hr 1day 2day 4day 7day 10day 1yr 0.34 0.52 0.64 0.86 1.05 1.29 1yr 0.91 1.26 1.50 1.94 2.38 3.01 3.26 1yr 2.66 3.13 3.59 4.30 4.98 1yr 2yr 0.39 0.61 0.75 1.01 1.24 1.50 2yr 1.07 1.46 1.71 2.20 2.76 3.45 3.77 2yr 3.05 3.63 4.16 4.92 5.54 2yr 5yr 0.47 0.73 0.90 1.24 1.58 1.92 5yr 1.36 1.88 2.15 2.80 3.49 4.35 4.85 5yr 3.85 4.67 5.33 6.22 7.03 5yr 10yr 0.56 0.86 1.06 1.49 1.92 2.35 10yr 1.66 2.30 2.67 3.37 4.18 5.20 5.87 10yr 4.60 5.64 6.46 7.46 8.39 10yr 25yr 0.71 1.08 1.34 1.91 2.52 3.08 25yr 2.17 3.01 3.48 4.32 5.33 6.58 7.55 25yr 5.82 7.26 8.35 9.44 10.71 25yr 50yr 0.84 1.28 1.60 2.29 3.09 3.57 50yr 2.67 3.49 4.24 5.21 6.39 7.88 9.12 50yr 6.97 8.77 10.12 11.29 12.85 50yr 100yr 1.01 1.53 1.92 2.77 3.80 4.65 100yr 3.28 4.55 5.18 6.29 7.67 9.42 11.04 100yr 8.33 10.62 12.26 13.50 15.40 100yr 200yr 1.22 1.83 2.32 3.35 4.68 5.74 200yr 4.04 5.61 6.33 7.58 9.20 11.25 13.36 200yr 9.96 12.85 14.88 16.14 18.48 200yr 500yr 1.56 2.32 2.99 4.34 6.18 6.89 500yr 5.33 6.73 8.28 9.72 11.74 14.23 17.20 500yr 12.60 16.54 19.25 20.44 23.51 500yr Extreme Precipitation Tables: 41.453°N, 72.155°W http://precip.eas.cornell.edu/data.php?1672248269048 1 of 1 12/28/2022, 12:24 PM United States Department of Agriculture A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for State of ConnecticutNatural Resources Conservation Service December 28, 2022 9 Custom Soil Resource Report Soil Map 45928404592890459294045929904593040459309045931404592840459289045929404592990459304045930904593140737500 737550 737600 737650 737700 737750 737800 737850 737900 737950 738000 737500 737550 737600 737650 737700 737750 737800 737850 737900 737950 738000 41° 27' 17'' N 72° 9' 24'' W41° 27' 17'' N72° 9' 1'' W41° 27' 6'' N 72° 9' 24'' W41° 27' 6'' N 72° 9' 1'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 18N WGS84 0 100 200 400 600 Feet 0 35 70 140 210 Meters Map Scale: 1:2,390 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:12,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: State of Connecticut Survey Area Data: Version 22, Sep 12, 2022 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Data not available. The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Custom Soil Resource Report 10 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 3 Ridgebury, Leicester, and Whitman soils, 0 to 8 percent slopes, extremely stony 0.0 0.0% 45A Woodbridge fine sandy loam, 0 to 3 percent slopes 5.0 43.9% 45B Woodbridge fine sandy loam, 3 to 8 percent slopes 6.2 54.4% 46B Woodbridge fine sandy loam, 0 to 8 percent slopes, very stony 0.2 1.7% Totals for Area of Interest 11.4 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. Custom Soil Resource Report 11 The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha-Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. Custom Soil Resource Report 12 State of Connecticut 3—Ridgebury, Leicester, and Whitman soils, 0 to 8 percent slopes, extremely stony Map Unit Setting National map unit symbol: 2t2qt Elevation: 0 to 1,480 feet Mean annual precipitation: 36 to 71 inches Mean annual air temperature: 39 to 55 degrees F Frost-free period: 140 to 240 days Farmland classification: Not prime farmland Map Unit Composition Ridgebury, extremely stony, and similar soils:40 percent Leicester, extremely stony, and similar soils:35 percent Whitman, extremely stony, and similar soils:17 percent Minor components:8 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Ridgebury, Extremely Stony Setting Landform:Drumlins, ground moraines, hills, drainageways, depressions Landform position (two-dimensional):Footslope, toeslope Landform position (three-dimensional):Head slope, base slope Down-slope shape:Concave Across-slope shape:Concave Parent material:Coarse-loamy lodgment till derived from gneiss, granite, and/or schist Typical profile Oe - 0 to 1 inches: moderately decomposed plant material A - 1 to 6 inches: fine sandy loam Bw - 6 to 10 inches: sandy loam Bg - 10 to 19 inches: gravelly sandy loam Cd - 19 to 66 inches: gravelly sandy loam Properties and qualities Slope:0 to 8 percent Surface area covered with cobbles, stones or boulders:9.0 percent Depth to restrictive feature:15 to 35 inches to densic material Drainage class:Poorly drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat):Very low to moderately low (0.00 to 0.14 in/hr) Depth to water table:About 0 to 6 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.9 mmhos/cm) Available water supply, 0 to 60 inches: Low (about 3.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Custom Soil Resource Report 13 Hydrologic Soil Group: D Ecological site: F144AY009CT - Wet Till Depressions Hydric soil rating: Yes Description of Leicester, Extremely Stony Setting Landform:Ground moraines, hills, drainageways, depressions Landform position (two-dimensional):Footslope, toeslope Landform position (three-dimensional):Base slope Down-slope shape:Concave, linear Across-slope shape:Concave Parent material:Coarse-loamy melt-out till derived from gneiss, granite, and/or schist Typical profile Oe - 0 to 1 inches: moderately decomposed plant material A - 1 to 7 inches: fine sandy loam Bg - 7 to 18 inches: fine sandy loam BC - 18 to 24 inches: fine sandy loam C1 - 24 to 39 inches: gravelly fine sandy loam C2 - 39 to 65 inches: gravelly fine sandy loam Properties and qualities Slope:0 to 8 percent Surface area covered with cobbles, stones or boulders:9.0 percent Depth to restrictive feature:More than 80 inches Drainage class:Poorly drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat):Moderately low to high (0.14 to 14.17 in/hr) Depth to water table:About 0 to 6 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.9 mmhos/cm) Available water supply, 0 to 60 inches: High (about 9.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: B/D Ecological site: F144AY009CT - Wet Till Depressions Hydric soil rating: Yes Description of Whitman, Extremely Stony Setting Landform:Drumlins, ground moraines, hills, drainageways, depressions Landform position (two-dimensional):Toeslope Landform position (three-dimensional):Base slope Down-slope shape:Concave Across-slope shape:Concave Parent material:Coarse-loamy lodgment till derived from gneiss, granite, and/or schist Typical profile Oi - 0 to 1 inches: peat Custom Soil Resource Report 14 A - 1 to 10 inches: fine sandy loam Bg - 10 to 17 inches: gravelly fine sandy loam Cdg - 17 to 61 inches: fine sandy loam Properties and qualities Slope:0 to 3 percent Surface area covered with cobbles, stones or boulders:9.0 percent Depth to restrictive feature:7 to 38 inches to densic material Drainage class:Very poorly drained Runoff class: Negligible Capacity of the most limiting layer to transmit water (Ksat):Very low to moderately low (0.00 to 0.14 in/hr) Depth to water table:About 0 to 6 inches Frequency of flooding:None Frequency of ponding:Frequent Maximum salinity:Nonsaline (0.0 to 1.9 mmhos/cm) Available water supply, 0 to 60 inches: Low (about 3.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 7s Hydrologic Soil Group: D Ecological site: F144AY009CT - Wet Till Depressions Hydric soil rating: Yes Minor Components Woodbridge, extremely stony Percent of map unit:6 percent Landform:Hills, drumlins, ground moraines Landform position (two-dimensional):Summit, backslope, footslope Landform position (three-dimensional):Side slope, crest Down-slope shape:Concave Across-slope shape:Linear Hydric soil rating: No Swansea Percent of map unit:2 percent Landform:Bogs, swamps Down-slope shape:Concave Across-slope shape:Concave Hydric soil rating: Yes 45A—Woodbridge fine sandy loam, 0 to 3 percent slopes Map Unit Setting National map unit symbol: 2w686 Elevation: 0 to 1,420 feet Custom Soil Resource Report 15 Mean annual precipitation: 36 to 71 inches Mean annual air temperature: 39 to 55 degrees F Frost-free period: 140 to 240 days Farmland classification: All areas are prime farmland Map Unit Composition Woodbridge and similar soils:85 percent Minor components:15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Woodbridge Setting Landform:Ground moraines, hills, drumlins Landform position (two-dimensional):Summit, footslope Landform position (three-dimensional):Crest Down-slope shape:Convex Across-slope shape:Linear Parent material:Coarse-loamy lodgment till derived from gneiss, granite, and/or schist Typical profile Ap - 0 to 7 inches: fine sandy loam Bw1 - 7 to 18 inches: fine sandy loam Bw2 - 18 to 30 inches: fine sandy loam Cd - 30 to 65 inches: gravelly fine sandy loam Properties and qualities Slope:0 to 3 percent Depth to restrictive feature:20 to 39 inches to densic material Drainage class:Moderately well drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat):Very low to moderately low (0.00 to 0.14 in/hr) Depth to water table:About 18 to 30 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.9 mmhos/cm) Available water supply, 0 to 60 inches: Low (about 4.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2w Hydrologic Soil Group: C/D Ecological site: F144AY037MA - Moist Dense Till Uplands Hydric soil rating: No Minor Components Paxton Percent of map unit:7 percent Landform:Ground moraines, hills, drumlins Landform position (two-dimensional):Summit, shoulder Landform position (three-dimensional):Crest Down-slope shape:Convex, linear Across-slope shape:Convex Hydric soil rating: No Custom Soil Resource Report 16 Ridgebury Percent of map unit:6 percent Landform:Depressions, ground moraines, drainageways, drumlins, hills Landform position (two-dimensional):Footslope, toeslope Landform position (three-dimensional):Head slope, base slope Down-slope shape:Concave Across-slope shape:Concave Hydric soil rating: Yes Sutton Percent of map unit:1 percent Landform:Ground moraines, hills Landform position (two-dimensional):Footslope Landform position (three-dimensional):Base slope Down-slope shape:Concave Across-slope shape:Linear Hydric soil rating: No Whitman, extremely stony Percent of map unit:1 percent Landform:Drainageways, depressions Down-slope shape:Concave Across-slope shape:Concave Hydric soil rating: Yes 45B—Woodbridge fine sandy loam, 3 to 8 percent slopes Map Unit Setting National map unit symbol: 2t2ql Elevation: 0 to 1,470 feet Mean annual precipitation: 36 to 71 inches Mean annual air temperature: 39 to 55 degrees F Frost-free period: 140 to 240 days Farmland classification: All areas are prime farmland Map Unit Composition Woodbridge, fine sandy loam, and similar soils:82 percent Minor components:18 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Woodbridge, Fine Sandy Loam Setting Landform:Ground moraines, drumlins, hills Landform position (two-dimensional):Summit, backslope, footslope Landform position (three-dimensional):Side slope Down-slope shape:Concave Across-slope shape:Linear Parent material:Coarse-loamy lodgment till derived from gneiss, granite, and/or schist Custom Soil Resource Report 17 Typical profile Ap - 0 to 7 inches: fine sandy loam Bw1 - 7 to 18 inches: fine sandy loam Bw2 - 18 to 30 inches: fine sandy loam Cd - 30 to 65 inches: gravelly fine sandy loam Properties and qualities Slope:3 to 8 percent Depth to restrictive feature:20 to 39 inches to densic material Drainage class:Moderately well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat):Very low to moderately low (0.00 to 0.14 in/hr) Depth to water table:About 18 to 30 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.9 mmhos/cm) Available water supply, 0 to 60 inches: Low (about 3.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2w Hydrologic Soil Group: C/D Ecological site: F144AY037MA - Moist Dense Till Uplands Hydric soil rating: No Minor Components Paxton Percent of map unit:10 percent Landform:Drumlins, ground moraines, hills Landform position (two-dimensional):Summit, shoulder, backslope Landform position (three-dimensional):Nose slope, side slope, crest Down-slope shape:Convex, linear Across-slope shape:Convex Hydric soil rating: No Ridgebury Percent of map unit:8 percent Landform:Depressions, ground moraines, hills, drainageways Landform position (two-dimensional):Toeslope, backslope, footslope Landform position (three-dimensional):Base slope, head slope, dip Down-slope shape:Concave Across-slope shape:Concave Hydric soil rating: Yes 46B—Woodbridge fine sandy loam, 0 to 8 percent slopes, very stony Map Unit Setting National map unit symbol: 2t2qr Custom Soil Resource Report 18 Elevation: 0 to 1,440 feet Mean annual precipitation: 36 to 71 inches Mean annual air temperature: 39 to 55 degrees F Frost-free period: 140 to 240 days Farmland classification: Not prime farmland Map Unit Composition Woodbridge, very stony, and similar soils:82 percent Minor components:18 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Woodbridge, Very Stony Setting Landform:Ground moraines, hills, drumlins Landform position (two-dimensional):Summit, backslope, footslope Landform position (three-dimensional):Side slope Down-slope shape:Concave Across-slope shape:Linear Parent material:Coarse-loamy lodgment till derived from gneiss, granite, and/or schist Typical profile Oe - 0 to 2 inches: moderately decomposed plant material A - 2 to 9 inches: fine sandy loam Bw1 - 9 to 20 inches: fine sandy loam Bw2 - 20 to 32 inches: fine sandy loam Cd - 32 to 67 inches: gravelly fine sandy loam Properties and qualities Slope:0 to 8 percent Surface area covered with cobbles, stones or boulders:1.6 percent Depth to restrictive feature:20 to 43 inches to densic material Drainage class:Moderately well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat):Very low to moderately low (0.00 to 0.14 in/hr) Depth to water table:About 19 to 27 inches Frequency of flooding:None Frequency of ponding:None Maximum salinity:Nonsaline (0.0 to 1.9 mmhos/cm) Available water supply, 0 to 60 inches: Low (about 4.0 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6s Hydrologic Soil Group: C/D Ecological site: F144AY037MA - Moist Dense Till Uplands Hydric soil rating: No Minor Components Paxton, very stony Percent of map unit:10 percent Landform:Ground moraines, hills, drumlins Landform position (two-dimensional):Summit, shoulder, backslope Landform position (three-dimensional):Side slope, crest Custom Soil Resource Report 19 Down-slope shape:Convex, linear Across-slope shape:Linear, convex Hydric soil rating: No Ridgebury, very stony Percent of map unit:8 percent Landform:Hills, drainageways, drumlins, depressions, ground moraines Landform position (two-dimensional):Toeslope Landform position (three-dimensional):Head slope, base slope Down-slope shape:Concave Across-slope shape:Concave Hydric soil rating: Yes Custom Soil Resource Report 20 CIVILWORKS NEW ENGLAND Dover, NH / Turners Falls, MA Test Pit:TP-SW1RedoxDepth (ft) Horizon Texture Features Notes0 - 6" A Loam None topsoil6" - 22" B FSL None subsoil22" - 36" C1 FSL See Note iron striations to 40", fine roots to 32"36" - 70" C2 LS None clean, stopped excavation at 70" (not refusal)Estimated Seasonal High Water:NoneObserved Water:NoneRestrictive Layer:NoneBedrock/Refusal:NonePage 1 of 1 CIVILWORKS NEW ENGLAND Dover, NH / Turners Falls, MA Test Pit:TP-SW2RedoxDepth (ft) Horizon Texture Features Notes0 - 6" A Loam None topsoil6" - 18" B FSL None subsoil18" - 32" C1 FSL None some silt pockets, fine roots to 32"32" - 42" North C2 LS None clean, rock encountered at 42" on north end32" - 60" South C2 LS None stopped excav. at 60" on south end (rock not hit)Estimated Seasonal High Water:NoneObserved Water:NoneRestrictive Layer: At 42" on north end of test pitBedrock/Refusal: At 42" on north end of test pitPage 2 of 1 % Impervious Coverage and Storm Water Quality Volume (WQV) 123456789101112131415161718A B C D E F G HSUBCATCHMENT TO INFILTRATION BASIN SUBCATCHMENTTOTAL AREAPAVED/ROOF AREA % PAVED COV.POROUS PAVER AREA% POROUS PAVER AREALAWN AREA% LANDSCAPE COV.WSA20.254 0.11344.488 0.000 0.0000.14255.906SUM TO BASIN (IB1)0.255 0.113 44.314 0.0000.0000.14255.686WATER QUALITY VOLUME (WQV) WQV= 1" x R x A/12WQV= water quailty volume (ac-ft)R= volumetric runoff coefficent = 0.05 + 0.009 (I)I= percent impervious cover 44.314A= site area in acres 0.255WQV (REQUIRED)= 0.013 acre-feet 550.67 CFSEDIMENT FOREBAY CALCULATION Sediment Forebay Volume = 25% x WQVSediment Forebay Volume 137.67 CFpage 1 3.2 EXISTING WATERSHEDS A WSA B WSB DPA DESIGN POINT A DPB DESIGN POINT B Routing Diagram for 22102-PRE Prepared by {enter your company name here}, Printed 2/10/2023 HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Subcat Reach Pond Link 22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 2HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (sq-ft) CN Description (subcatchment-numbers) 37,943 74 >75% Grass cover, Good, HSG C (A, B) 5,957 96 Gravel surface, HSG C (A, B) 6,158 98 Paved parking, HSG C (A, B) 2,066 98 Roofs, HSG C (B) 565 98 Unconnected pavement, HSG C (A, B) 2,955 70 Woods, Good, HSG C (A, B) 55,644 80 TOTAL AREA 22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 3HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (sq-ft) Soil Group Subcatchment Numbers 0 HSG A 0 HSG B 55,644 HSG C A, B 0 HSG D 0 Other 55,644 TOTAL AREA 22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 4HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (sq-ft) HSG-B (sq-ft) HSG-C (sq-ft) HSG-D (sq-ft) Other (sq-ft) Total (sq-ft) Ground Cover Subcatchment Numbers 0 0 37,943 0 0 37,943 >75% Grass cover, Good 0 0 5,957 0 0 5,957 Gravel surface 0 0 6,158 0 0 6,158 Paved parking 0 0 2,066 0 0 2,066 Roofs 0 0 565 0 0 565 Unconnected pavement 0 0 2,955 0 0 2,955 Woods, Good 0 0 55,644 0 0 55,644 TOTAL AREA 22102 24-hr S1 2-yr Rainfall=3.35"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 5HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=32,460 sf 14.77% Impervious Runoff Depth=1.38"Subcatchment A: WSA Flow Length=410' Tc=11.7 min CN=78 Runoff=0.95 cfs 3,745 cf Runoff Area=23,184 sf 17.23% Impervious Runoff Depth=1.66"Subcatchment B: WSB Flow Length=416' Tc=10.3 min CN=82 Runoff=0.88 cfs 3,206 cf Inflow=0.95 cfs 3,745 cfLink DPA: DESIGN POINT A Primary=0.95 cfs 3,745 cf Inflow=0.88 cfs 3,206 cfLink DPB: DESIGN POINT B Primary=0.88 cfs 3,206 cf Total Runoff Area = 55,644 sf Runoff Volume = 6,951 cf Average Runoff Depth = 1.50" 84.20% Pervious = 46,855 sf 15.80% Impervious = 8,789 sf 22102 24-hr S1 2-yr Rainfall=3.35"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 6HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment A: WSA Runoff = 0.95 cfs @ 12.12 hrs, Volume= 3,745 cf, Depth= 1.38" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 2-yr Rainfall=3.35" Area (sf) CN Description 2,133 70 Woods, Good, HSG C 24,102 74 >75% Grass cover, Good, HSG C 1,431 96 Gravel surface, HSG C 362 98 Unconnected pavement, HSG C 4,432 98 Paved parking, HSG C 32,460 78 Weighted Average 27,666 85.23% Pervious Area 4,794 14.77% Impervious Area 362 7.55% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.6 39 0.0231 1.06 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.2 58 0.0363 3.87 Shallow Concentrated Flow, 3 Paved Kv= 20.3 fps 0.6 57 0.0456 1.49 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.1 23 0.0605 4.99 Shallow Concentrated Flow, 5 Paved Kv= 20.3 fps 0.2 27 0.0980 2.19 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.3 34 0.0582 1.69 Shallow Concentrated Flow, 7 Short Grass Pasture Kv= 7.0 fps 1.2 73 0.0219 1.04 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 0.8 31 0.0096 0.69 Shallow Concentrated Flow, 9 Short Grass Pasture Kv= 7.0 fps 0.6 18 0.0057 0.53 Shallow Concentrated Flow, 10 Short Grass Pasture Kv= 7.0 fps 11.7 410 Total 22102 24-hr S1 2-yr Rainfall=3.35"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 7HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment B: WSB Runoff = 0.88 cfs @ 12.09 hrs, Volume= 3,206 cf, Depth= 1.66" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 2-yr Rainfall=3.35" Area (sf) CN Description 822 70 Woods, Good, HSG C 13,841 74 >75% Grass cover, Good, HSG C 203 98 Unconnected pavement, HSG C 2,066 98 Roofs, HSG C 4,526 96 Gravel surface, HSG C 1,726 98 Paved parking, HSG C 23,184 82 Weighted Average 19,189 82.77% Pervious Area 3,995 17.23% Impervious Area 203 5.08% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.4 36 0.0444 1.47 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.7 115 0.0261 2.60 Shallow Concentrated Flow, 3 Unpaved Kv= 16.1 fps 0.5 42 0.0476 1.53 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.2 29 0.1034 2.25 Shallow Concentrated Flow, 5 Short Grass Pasture Kv= 7.0 fps 0.5 44 0.0511 1.58 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.4 71 0.0246 3.18 Shallow Concentrated Flow, 7 Paved Kv= 20.3 fps 0.5 29 0.0172 0.92 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 10.3 416 Total 22102 24-hr S1 2-yr Rainfall=3.35"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 8HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPA: DESIGN POINT A Inflow Area = 32,460 sf, 14.77% Impervious, Inflow Depth = 1.38" for 2-yr event Inflow = 0.95 cfs @ 12.12 hrs, Volume= 3,745 cf Primary = 0.95 cfs @ 12.12 hrs, Volume= 3,745 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 2-yr Rainfall=3.35"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 9HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPB: DESIGN POINT B Inflow Area = 23,184 sf, 17.23% Impervious, Inflow Depth = 1.66" for 2-yr event Inflow = 0.88 cfs @ 12.09 hrs, Volume= 3,206 cf Primary = 0.88 cfs @ 12.09 hrs, Volume= 3,206 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 10-yr Rainfall=4.83"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 10HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=32,460 sf 14.77% Impervious Runoff Depth=2.57"Subcatchment A: WSA Flow Length=410' Tc=11.7 min CN=78 Runoff=1.76 cfs 6,946 cf Runoff Area=23,184 sf 17.23% Impervious Runoff Depth=2.93"Subcatchment B: WSB Flow Length=416' Tc=10.3 min CN=82 Runoff=1.53 cfs 5,656 cf Inflow=1.76 cfs 6,946 cfLink DPA: DESIGN POINT A Primary=1.76 cfs 6,946 cf Inflow=1.53 cfs 5,656 cfLink DPB: DESIGN POINT B Primary=1.53 cfs 5,656 cf Total Runoff Area = 55,644 sf Runoff Volume = 12,602 cf Average Runoff Depth = 2.72" 84.20% Pervious = 46,855 sf 15.80% Impervious = 8,789 sf 22102 24-hr S1 10-yr Rainfall=4.83"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 11HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment A: WSA Runoff = 1.76 cfs @ 12.11 hrs, Volume= 6,946 cf, Depth= 2.57" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 10-yr Rainfall=4.83" Area (sf) CN Description 2,133 70 Woods, Good, HSG C 24,102 74 >75% Grass cover, Good, HSG C 1,431 96 Gravel surface, HSG C 362 98 Unconnected pavement, HSG C 4,432 98 Paved parking, HSG C 32,460 78 Weighted Average 27,666 85.23% Pervious Area 4,794 14.77% Impervious Area 362 7.55% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.6 39 0.0231 1.06 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.2 58 0.0363 3.87 Shallow Concentrated Flow, 3 Paved Kv= 20.3 fps 0.6 57 0.0456 1.49 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.1 23 0.0605 4.99 Shallow Concentrated Flow, 5 Paved Kv= 20.3 fps 0.2 27 0.0980 2.19 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.3 34 0.0582 1.69 Shallow Concentrated Flow, 7 Short Grass Pasture Kv= 7.0 fps 1.2 73 0.0219 1.04 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 0.8 31 0.0096 0.69 Shallow Concentrated Flow, 9 Short Grass Pasture Kv= 7.0 fps 0.6 18 0.0057 0.53 Shallow Concentrated Flow, 10 Short Grass Pasture Kv= 7.0 fps 11.7 410 Total 22102 24-hr S1 10-yr Rainfall=4.83"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 12HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment B: WSB Runoff = 1.53 cfs @ 12.09 hrs, Volume= 5,656 cf, Depth= 2.93" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 10-yr Rainfall=4.83" Area (sf) CN Description 822 70 Woods, Good, HSG C 13,841 74 >75% Grass cover, Good, HSG C 203 98 Unconnected pavement, HSG C 2,066 98 Roofs, HSG C 4,526 96 Gravel surface, HSG C 1,726 98 Paved parking, HSG C 23,184 82 Weighted Average 19,189 82.77% Pervious Area 3,995 17.23% Impervious Area 203 5.08% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.4 36 0.0444 1.47 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.7 115 0.0261 2.60 Shallow Concentrated Flow, 3 Unpaved Kv= 16.1 fps 0.5 42 0.0476 1.53 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.2 29 0.1034 2.25 Shallow Concentrated Flow, 5 Short Grass Pasture Kv= 7.0 fps 0.5 44 0.0511 1.58 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.4 71 0.0246 3.18 Shallow Concentrated Flow, 7 Paved Kv= 20.3 fps 0.5 29 0.0172 0.92 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 10.3 416 Total 22102 24-hr S1 10-yr Rainfall=4.83"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 13HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPA: DESIGN POINT A Inflow Area = 32,460 sf, 14.77% Impervious, Inflow Depth = 2.57" for 10-yr event Inflow = 1.76 cfs @ 12.11 hrs, Volume= 6,946 cf Primary = 1.76 cfs @ 12.11 hrs, Volume= 6,946 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 10-yr Rainfall=4.83"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 14HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPB: DESIGN POINT B Inflow Area = 23,184 sf, 17.23% Impervious, Inflow Depth = 2.93" for 10-yr event Inflow = 1.53 cfs @ 12.09 hrs, Volume= 5,656 cf Primary = 1.53 cfs @ 12.09 hrs, Volume= 5,656 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 25-yr Rainfall=5.95"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 15HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=32,460 sf 14.77% Impervious Runoff Depth=3.53"Subcatchment A: WSA Flow Length=410' Tc=11.7 min CN=78 Runoff=2.40 cfs 9,562 cf Runoff Area=23,184 sf 17.23% Impervious Runoff Depth=3.94"Subcatchment B: WSB Flow Length=416' Tc=10.3 min CN=82 Runoff=2.01 cfs 7,614 cf Inflow=2.40 cfs 9,562 cfLink DPA: DESIGN POINT A Primary=2.40 cfs 9,562 cf Inflow=2.01 cfs 7,614 cfLink DPB: DESIGN POINT B Primary=2.01 cfs 7,614 cf Total Runoff Area = 55,644 sf Runoff Volume = 17,176 cf Average Runoff Depth = 3.70" 84.20% Pervious = 46,855 sf 15.80% Impervious = 8,789 sf 22102 24-hr S1 25-yr Rainfall=5.95"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 16HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment A: WSA Runoff = 2.40 cfs @ 12.11 hrs, Volume= 9,562 cf, Depth= 3.53" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 25-yr Rainfall=5.95" Area (sf) CN Description 2,133 70 Woods, Good, HSG C 24,102 74 >75% Grass cover, Good, HSG C 1,431 96 Gravel surface, HSG C 362 98 Unconnected pavement, HSG C 4,432 98 Paved parking, HSG C 32,460 78 Weighted Average 27,666 85.23% Pervious Area 4,794 14.77% Impervious Area 362 7.55% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.6 39 0.0231 1.06 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.2 58 0.0363 3.87 Shallow Concentrated Flow, 3 Paved Kv= 20.3 fps 0.6 57 0.0456 1.49 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.1 23 0.0605 4.99 Shallow Concentrated Flow, 5 Paved Kv= 20.3 fps 0.2 27 0.0980 2.19 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.3 34 0.0582 1.69 Shallow Concentrated Flow, 7 Short Grass Pasture Kv= 7.0 fps 1.2 73 0.0219 1.04 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 0.8 31 0.0096 0.69 Shallow Concentrated Flow, 9 Short Grass Pasture Kv= 7.0 fps 0.6 18 0.0057 0.53 Shallow Concentrated Flow, 10 Short Grass Pasture Kv= 7.0 fps 11.7 410 Total 22102 24-hr S1 25-yr Rainfall=5.95"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 17HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment B: WSB Runoff = 2.01 cfs @ 12.09 hrs, Volume= 7,614 cf, Depth= 3.94" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 25-yr Rainfall=5.95" Area (sf) CN Description 822 70 Woods, Good, HSG C 13,841 74 >75% Grass cover, Good, HSG C 203 98 Unconnected pavement, HSG C 2,066 98 Roofs, HSG C 4,526 96 Gravel surface, HSG C 1,726 98 Paved parking, HSG C 23,184 82 Weighted Average 19,189 82.77% Pervious Area 3,995 17.23% Impervious Area 203 5.08% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.4 36 0.0444 1.47 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.7 115 0.0261 2.60 Shallow Concentrated Flow, 3 Unpaved Kv= 16.1 fps 0.5 42 0.0476 1.53 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.2 29 0.1034 2.25 Shallow Concentrated Flow, 5 Short Grass Pasture Kv= 7.0 fps 0.5 44 0.0511 1.58 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.4 71 0.0246 3.18 Shallow Concentrated Flow, 7 Paved Kv= 20.3 fps 0.5 29 0.0172 0.92 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 10.3 416 Total 22102 24-hr S1 25-yr Rainfall=5.95"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 18HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPA: DESIGN POINT A Inflow Area = 32,460 sf, 14.77% Impervious, Inflow Depth = 3.53" for 25-yr event Inflow = 2.40 cfs @ 12.11 hrs, Volume= 9,562 cf Primary = 2.40 cfs @ 12.11 hrs, Volume= 9,562 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 25-yr Rainfall=5.95"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 19HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPB: DESIGN POINT B Inflow Area = 23,184 sf, 17.23% Impervious, Inflow Depth = 3.94" for 25-yr event Inflow = 2.01 cfs @ 12.09 hrs, Volume= 7,614 cf Primary = 2.01 cfs @ 12.09 hrs, Volume= 7,614 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 50-yr Rainfall=6.98"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 20HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=32,460 sf 14.77% Impervious Runoff Depth=4.46"Subcatchment A: WSA Flow Length=410' Tc=11.7 min CN=78 Runoff=3.02 cfs 12,055 cf Runoff Area=23,184 sf 17.23% Impervious Runoff Depth=4.90"Subcatchment B: WSB Flow Length=416' Tc=10.3 min CN=82 Runoff=2.49 cfs 9,462 cf Inflow=3.02 cfs 12,055 cfLink DPA: DESIGN POINT A Primary=3.02 cfs 12,055 cf Inflow=2.49 cfs 9,462 cfLink DPB: DESIGN POINT B Primary=2.49 cfs 9,462 cf Total Runoff Area = 55,644 sf Runoff Volume = 21,517 cf Average Runoff Depth = 4.64" 84.20% Pervious = 46,855 sf 15.80% Impervious = 8,789 sf 22102 24-hr S1 50-yr Rainfall=6.98"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 21HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment A: WSA Runoff = 3.02 cfs @ 12.11 hrs, Volume= 12,055 cf, Depth= 4.46" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 50-yr Rainfall=6.98" Area (sf) CN Description 2,133 70 Woods, Good, HSG C 24,102 74 >75% Grass cover, Good, HSG C 1,431 96 Gravel surface, HSG C 362 98 Unconnected pavement, HSG C 4,432 98 Paved parking, HSG C 32,460 78 Weighted Average 27,666 85.23% Pervious Area 4,794 14.77% Impervious Area 362 7.55% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.6 39 0.0231 1.06 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.2 58 0.0363 3.87 Shallow Concentrated Flow, 3 Paved Kv= 20.3 fps 0.6 57 0.0456 1.49 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.1 23 0.0605 4.99 Shallow Concentrated Flow, 5 Paved Kv= 20.3 fps 0.2 27 0.0980 2.19 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.3 34 0.0582 1.69 Shallow Concentrated Flow, 7 Short Grass Pasture Kv= 7.0 fps 1.2 73 0.0219 1.04 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 0.8 31 0.0096 0.69 Shallow Concentrated Flow, 9 Short Grass Pasture Kv= 7.0 fps 0.6 18 0.0057 0.53 Shallow Concentrated Flow, 10 Short Grass Pasture Kv= 7.0 fps 11.7 410 Total 22102 24-hr S1 50-yr Rainfall=6.98"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 22HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment B: WSB Runoff = 2.49 cfs @ 12.09 hrs, Volume= 9,462 cf, Depth= 4.90" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 50-yr Rainfall=6.98" Area (sf) CN Description 822 70 Woods, Good, HSG C 13,841 74 >75% Grass cover, Good, HSG C 203 98 Unconnected pavement, HSG C 2,066 98 Roofs, HSG C 4,526 96 Gravel surface, HSG C 1,726 98 Paved parking, HSG C 23,184 82 Weighted Average 19,189 82.77% Pervious Area 3,995 17.23% Impervious Area 203 5.08% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.4 36 0.0444 1.47 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.7 115 0.0261 2.60 Shallow Concentrated Flow, 3 Unpaved Kv= 16.1 fps 0.5 42 0.0476 1.53 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.2 29 0.1034 2.25 Shallow Concentrated Flow, 5 Short Grass Pasture Kv= 7.0 fps 0.5 44 0.0511 1.58 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.4 71 0.0246 3.18 Shallow Concentrated Flow, 7 Paved Kv= 20.3 fps 0.5 29 0.0172 0.92 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 10.3 416 Total 22102 24-hr S1 50-yr Rainfall=6.98"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 23HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPA: DESIGN POINT A Inflow Area = 32,460 sf, 14.77% Impervious, Inflow Depth = 4.46" for 50-yr event Inflow = 3.02 cfs @ 12.11 hrs, Volume= 12,055 cf Primary = 3.02 cfs @ 12.11 hrs, Volume= 12,055 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 50-yr Rainfall=6.98"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 24HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPB: DESIGN POINT B Inflow Area = 23,184 sf, 17.23% Impervious, Inflow Depth = 4.90" for 50-yr event Inflow = 2.49 cfs @ 12.09 hrs, Volume= 9,462 cf Primary = 2.49 cfs @ 12.09 hrs, Volume= 9,462 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 100-yr Rainfall=8.18"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 25HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Time span=0.00-48.00 hrs, dt=0.01 hrs, 4801 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=32,460 sf 14.77% Impervious Runoff Depth=5.56"Subcatchment A: WSA Flow Length=410' Tc=11.7 min CN=78 Runoff=3.74 cfs 15,033 cf Runoff Area=23,184 sf 17.23% Impervious Runoff Depth=6.03"Subcatchment B: WSB Flow Length=416' Tc=10.3 min CN=82 Runoff=3.02 cfs 11,652 cf Inflow=3.74 cfs 15,033 cfLink DPA: DESIGN POINT A Primary=3.74 cfs 15,033 cf Inflow=3.02 cfs 11,652 cfLink DPB: DESIGN POINT B Primary=3.02 cfs 11,652 cf Total Runoff Area = 55,644 sf Runoff Volume = 26,685 cf Average Runoff Depth = 5.75" 84.20% Pervious = 46,855 sf 15.80% Impervious = 8,789 sf 22102 24-hr S1 100-yr Rainfall=8.18"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 26HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment A: WSA Runoff = 3.74 cfs @ 12.11 hrs, Volume= 15,033 cf, Depth= 5.56" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 100-yr Rainfall=8.18" Area (sf) CN Description 2,133 70 Woods, Good, HSG C 24,102 74 >75% Grass cover, Good, HSG C 1,431 96 Gravel surface, HSG C 362 98 Unconnected pavement, HSG C 4,432 98 Paved parking, HSG C 32,460 78 Weighted Average 27,666 85.23% Pervious Area 4,794 14.77% Impervious Area 362 7.55% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.6 39 0.0231 1.06 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.2 58 0.0363 3.87 Shallow Concentrated Flow, 3 Paved Kv= 20.3 fps 0.6 57 0.0456 1.49 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.1 23 0.0605 4.99 Shallow Concentrated Flow, 5 Paved Kv= 20.3 fps 0.2 27 0.0980 2.19 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.3 34 0.0582 1.69 Shallow Concentrated Flow, 7 Short Grass Pasture Kv= 7.0 fps 1.2 73 0.0219 1.04 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 0.8 31 0.0096 0.69 Shallow Concentrated Flow, 9 Short Grass Pasture Kv= 7.0 fps 0.6 18 0.0057 0.53 Shallow Concentrated Flow, 10 Short Grass Pasture Kv= 7.0 fps 11.7 410 Total 22102 24-hr S1 100-yr Rainfall=8.18"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 27HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment B: WSB Runoff = 3.02 cfs @ 12.09 hrs, Volume= 11,652 cf, Depth= 6.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 100-yr Rainfall=8.18" Area (sf) CN Description 822 70 Woods, Good, HSG C 13,841 74 >75% Grass cover, Good, HSG C 203 98 Unconnected pavement, HSG C 2,066 98 Roofs, HSG C 4,526 96 Gravel surface, HSG C 1,726 98 Paved parking, HSG C 23,184 82 Weighted Average 19,189 82.77% Pervious Area 3,995 17.23% Impervious Area 203 5.08% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.4 36 0.0444 1.47 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.7 115 0.0261 2.60 Shallow Concentrated Flow, 3 Unpaved Kv= 16.1 fps 0.5 42 0.0476 1.53 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.2 29 0.1034 2.25 Shallow Concentrated Flow, 5 Short Grass Pasture Kv= 7.0 fps 0.5 44 0.0511 1.58 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.4 71 0.0246 3.18 Shallow Concentrated Flow, 7 Paved Kv= 20.3 fps 0.5 29 0.0172 0.92 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 10.3 416 Total 22102 24-hr S1 100-yr Rainfall=8.18"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 28HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPA: DESIGN POINT A Inflow Area = 32,460 sf, 14.77% Impervious, Inflow Depth = 5.56" for 100-yr event Inflow = 3.74 cfs @ 12.11 hrs, Volume= 15,033 cf Primary = 3.74 cfs @ 12.11 hrs, Volume= 15,033 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 100-yr Rainfall=8.18"22102-PRE Printed 2/10/2023Prepared by {enter your company name here} Page 29HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPB: DESIGN POINT B Inflow Area = 23,184 sf, 17.23% Impervious, Inflow Depth = 6.03" for 100-yr event Inflow = 3.02 cfs @ 12.09 hrs, Volume= 11,652 cf Primary = 3.02 cfs @ 12.09 hrs, Volume= 11,652 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 3.3 DEVELOPED WATERSHEDS A1 WSA1 B1 WSB1 B2 WSB2 OR1 OVERLAND REACH 1 IB1 INFIL BASIN 1 DPA1 DP A1 DPB1 DP B1 Routing Diagram for 22102-POST Prepared by {enter your company name here}, Printed 2/13/2023 HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Subcat Reach Pond Link 22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 2HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (sq-ft) CN Description (subcatchment-numbers) 33,317 74 >75% Grass cover, Good, HSG C (A1, B1, B2) 5,957 96 Gravel surface, HSG C (A1, B1) 9,674 98 Paved parking, HSG C (A1, B1, B2) 2,978 98 Roofs, HSG C (B1, B2) 644 98 Unconnected pavement, HSG C (A1, B1, B2) 3,074 70 Woods, Good, HSG C (A1, B1) 55,644 82 TOTAL AREA 22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 3HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (sq-ft) Soil Group Subcatchment Numbers 0 HSG A 0 HSG B 55,644 HSG C A1, B1, B2 0 HSG D 0 Other 55,644 TOTAL AREA 22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 4HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (sq-ft) HSG-B (sq-ft) HSG-C (sq-ft) HSG-D (sq-ft) Other (sq-ft) Total (sq-ft) Ground Cover Subcatchment Numbers 0 0 33,317 0 0 33,317 >75% Grass cover, Good 0 0 5,957 0 0 5,957 Gravel surface 0 0 9,674 0 0 9,674 Paved parking 0 0 2,978 0 0 2,978 Roofs 0 0 644 0 0 644 Unconnected pavement 0 0 3,074 0 0 3,074 Woods, Good 0 0 55,644 0 0 55,644 TOTAL AREA 22102 24-hr S1 2-yr Rainfall=3.35"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 5HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment A1: WSA1 Runoff = 0.88 cfs @ 12.11 hrs, Volume= 3,396 cf, Depth= 1.45" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 2-yr Rainfall=3.35" Area (sf) CN Description 2,474 70 Woods, Good, HSG C 19,642 74 >75% Grass cover, Good, HSG C 1,431 96 Gravel surface, HSG C 292 98 Unconnected pavement, HSG C 4,256 98 Paved parking, HSG C 28,095 79 Weighted Average 23,547 83.81% Pervious Area 4,548 16.19% Impervious Area 292 6.42% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.5 34 0.0265 1.14 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.3 58 0.0362 3.86 Shallow Concentrated Flow, 3 Paved Kv= 20.3 fps 0.6 57 0.0456 1.49 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.1 23 0.0609 5.01 Shallow Concentrated Flow, 5 Paved Kv= 20.3 fps 0.1 17 0.0941 2.15 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.8 38 0.0132 0.80 Shallow Concentrated Flow, 7 Short Grass Pasture Kv= 7.0 fps 0.4 25 0.0200 0.99 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 0.3 35 0.0857 2.05 Shallow Concentrated Flow, 9 Short Grass Pasture Kv= 7.0 fps 1.1 61 0.0164 0.90 Shallow Concentrated Flow, 10 Short Grass Pasture Kv= 7.0 fps 11.3 398 Total 22102 24-hr S1 2-yr Rainfall=3.35"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 6HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment B1: WSB1 Runoff = 0.73 cfs @ 12.09 hrs, Volume= 2,636 cf, Depth= 1.97" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 2-yr Rainfall=3.35" Area (sf) CN Description 600 70 Woods, Good, HSG C 7,133 74 >75% Grass cover, Good, HSG C 133 98 Unconnected pavement, HSG C 2,066 98 Roofs, HSG C 4,526 96 Gravel surface, HSG C 1,629 98 Paved parking, HSG C 16,087 86 Weighted Average 12,259 76.20% Pervious Area 3,828 23.80% Impervious Area 133 3.47% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.4 36 0.0444 1.47 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.7 115 0.0261 2.60 Shallow Concentrated Flow, 3 Unpaved Kv= 16.1 fps 0.5 42 0.0476 1.53 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.2 29 0.1034 2.25 Shallow Concentrated Flow, 5 Short Grass Pasture Kv= 7.0 fps 0.5 44 0.0511 1.58 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.4 71 0.0246 3.18 Shallow Concentrated Flow, 7 Paved Kv= 20.3 fps 0.5 29 0.0172 0.92 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 10.3 416 Total 22102 24-hr S1 2-yr Rainfall=3.35"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 7HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment B2: WSB2 Runoff = 0.60 cfs @ 12.04 hrs, Volume= 1,728 cf, Depth= 1.81" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 2-yr Rainfall=3.35" Area (sf) CN Description 6,542 74 >75% Grass cover, Good, HSG C 912 98 Roofs, HSG C 219 98 Unconnected pavement, HSG C 3,789 98 Paved parking, HSG C 11,462 84 Weighted Average 6,542 57.08% Pervious Area 4,920 42.92% Impervious Area 219 4.45% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.2 38 0.0618 0.15 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.0 13 0.0554 4.78 Shallow Concentrated Flow, 2 Paved Kv= 20.3 fps 0.9 35 0.0080 0.63 Shallow Concentrated Flow, 3 Short Grass Pasture Kv= 7.0 fps 0.3 27 0.0370 1.35 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.1 20 0.1015 2.23 Shallow Concentrated Flow, 5 Short Grass Pasture Kv= 7.0 fps 0.1 20 0.0125 2.27 Shallow Concentrated Flow, 6 Paved Kv= 20.3 fps 0.1 24 0.0217 2.99 Shallow Concentrated Flow, 7 Paved Kv= 20.3 fps 0.0 5 0.2400 3.43 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 5.7 182 Total 22102 24-hr S1 2-yr Rainfall=3.35"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 8HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Reach OR1: OVERLAND REACH 1 Inflow Area = 11,462 sf, 42.92% Impervious, Inflow Depth = 0.00" for 2-yr event Inflow = 0.00 cfs @ 0.00 hrs, Volume= 0 cf Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0 cf, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Max. Velocity= 0.00 fps, Min. Travel Time= 0.0 min Avg. Velocity = 0.00 fps, Avg. Travel Time= 0.0 min Peak Storage= 0 cf @ 0.00 hrs Average Depth at Peak Storage= 0.00' Bank-Full Depth= 1.00' Flow Area= 20.0 sf, Capacity= 3.25 cfs 30.00' x 1.00' deep Parabolic Channel, n= 0.400 Sheet flow: Woods+light brush Length= 30.4' Slope= 0.0033 '/' Inlet Invert= 461.00', Outlet Invert= 460.90' ‡ 22102 24-hr S1 2-yr Rainfall=3.35"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 9HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Pond IB1: INFIL BASIN 1 Inflow Area = 11,462 sf, 42.92% Impervious, Inflow Depth = 1.81" for 2-yr event Inflow = 0.60 cfs @ 12.04 hrs, Volume= 1,728 cf Outflow = 0.10 cfs @ 12.56 hrs, Volume= 1,728 cf, Atten= 83%, Lag= 31.6 min Discarded = 0.10 cfs @ 12.56 hrs, Volume= 1,728 cf Primary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 461.21' @ 12.56 hrs Surf.Area= 615 sf Storage= 495 cf Flood Elev= 462.75' Surf.Area= 2,164 sf Storage= 1,427 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 49.6 min ( 897.6 - 848.0 ) Volume Invert Avail.Storage Storage Description #1 461.00' 369 cf SEDIMENT FOREBAY (Irregular) Listed below (Recalc) #2 458.16' 1,015 cf Custom Stage Data (Irregular) Listed below (Recalc) #3 458.42' 44 cf 8.0" Round Pipe Storage x 3 L= 42.0' 1,427 cf Total Available Storage Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 461.00 134 94.9 0 0 134 462.00 321 123.9 221 221 651 462.20 1,259 212.6 148 369 3,026 Elevation Surf.Area Perim. Voids Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (%) (cubic-feet) (cubic-feet) (sq-ft) 458.16 395 110.4 0.0 0 0 395 458.17 395 110.4 40.0 2 2 396 459.17 395 110.4 40.0 158 160 507 459.50 395 110.4 40.0 52 212 543 461.00 395 110.4 20.0 119 330 709 462.00 672 141.4 100.0 527 858 1,342 462.20 905 157.8 100.0 157 1,015 1,734 Device Routing Invert Outlet Devices #1 Discarded 458.16'2.410 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 456.90' #2 Primary 461.30'Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.90 0.90 1.45 Width (feet) 0.25 0.25 4.00 4.90 Discarded OutFlow Max=0.10 cfs @ 12.56 hrs HW=461.21' (Free Discharge) 1=Exfiltration ( Controls 0.10 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=458.16' TW=461.00' (Dynamic Tailwater) 2=Custom Weir/Orifice ( Controls 0.00 cfs) 22102 24-hr S1 2-yr Rainfall=3.35"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 10HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPA1: DP A1 Inflow Area = 28,095 sf, 16.19% Impervious, Inflow Depth = 1.45" for 2-yr event Inflow = 0.88 cfs @ 12.11 hrs, Volume= 3,396 cf Primary = 0.88 cfs @ 12.11 hrs, Volume= 3,396 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 2-yr Rainfall=3.35"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 11HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPB1: DP B1 Inflow Area = 27,549 sf, 31.75% Impervious, Inflow Depth = 1.15" for 2-yr event Inflow = 0.73 cfs @ 12.09 hrs, Volume= 2,636 cf Primary = 0.73 cfs @ 12.09 hrs, Volume= 2,636 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 10-yr Rainfall=4.83"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 12HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment A1: WSA1 Runoff = 1.61 cfs @ 12.11 hrs, Volume= 6,218 cf, Depth= 2.66" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 10-yr Rainfall=4.83" Area (sf) CN Description 2,474 70 Woods, Good, HSG C 19,642 74 >75% Grass cover, Good, HSG C 1,431 96 Gravel surface, HSG C 292 98 Unconnected pavement, HSG C 4,256 98 Paved parking, HSG C 28,095 79 Weighted Average 23,547 83.81% Pervious Area 4,548 16.19% Impervious Area 292 6.42% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.5 34 0.0265 1.14 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.3 58 0.0362 3.86 Shallow Concentrated Flow, 3 Paved Kv= 20.3 fps 0.6 57 0.0456 1.49 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.1 23 0.0609 5.01 Shallow Concentrated Flow, 5 Paved Kv= 20.3 fps 0.1 17 0.0941 2.15 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.8 38 0.0132 0.80 Shallow Concentrated Flow, 7 Short Grass Pasture Kv= 7.0 fps 0.4 25 0.0200 0.99 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 0.3 35 0.0857 2.05 Shallow Concentrated Flow, 9 Short Grass Pasture Kv= 7.0 fps 1.1 61 0.0164 0.90 Shallow Concentrated Flow, 10 Short Grass Pasture Kv= 7.0 fps 11.3 398 Total 22102 24-hr S1 10-yr Rainfall=4.83"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 13HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment B1: WSB1 Runoff = 1.19 cfs @ 12.09 hrs, Volume= 4,436 cf, Depth= 3.31" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 10-yr Rainfall=4.83" Area (sf) CN Description 600 70 Woods, Good, HSG C 7,133 74 >75% Grass cover, Good, HSG C 133 98 Unconnected pavement, HSG C 2,066 98 Roofs, HSG C 4,526 96 Gravel surface, HSG C 1,629 98 Paved parking, HSG C 16,087 86 Weighted Average 12,259 76.20% Pervious Area 3,828 23.80% Impervious Area 133 3.47% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.4 36 0.0444 1.47 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.7 115 0.0261 2.60 Shallow Concentrated Flow, 3 Unpaved Kv= 16.1 fps 0.5 42 0.0476 1.53 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.2 29 0.1034 2.25 Shallow Concentrated Flow, 5 Short Grass Pasture Kv= 7.0 fps 0.5 44 0.0511 1.58 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.4 71 0.0246 3.18 Shallow Concentrated Flow, 7 Paved Kv= 20.3 fps 0.5 29 0.0172 0.92 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 10.3 416 Total 22102 24-hr S1 10-yr Rainfall=4.83"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 14HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment B2: WSB2 Runoff = 0.99 cfs @ 12.03 hrs, Volume= 2,976 cf, Depth= 3.12" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 10-yr Rainfall=4.83" Area (sf) CN Description 6,542 74 >75% Grass cover, Good, HSG C 912 98 Roofs, HSG C 219 98 Unconnected pavement, HSG C 3,789 98 Paved parking, HSG C 11,462 84 Weighted Average 6,542 57.08% Pervious Area 4,920 42.92% Impervious Area 219 4.45% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.2 38 0.0618 0.15 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.0 13 0.0554 4.78 Shallow Concentrated Flow, 2 Paved Kv= 20.3 fps 0.9 35 0.0080 0.63 Shallow Concentrated Flow, 3 Short Grass Pasture Kv= 7.0 fps 0.3 27 0.0370 1.35 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.1 20 0.1015 2.23 Shallow Concentrated Flow, 5 Short Grass Pasture Kv= 7.0 fps 0.1 20 0.0125 2.27 Shallow Concentrated Flow, 6 Paved Kv= 20.3 fps 0.1 24 0.0217 2.99 Shallow Concentrated Flow, 7 Paved Kv= 20.3 fps 0.0 5 0.2400 3.43 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 5.7 182 Total 22102 24-hr S1 10-yr Rainfall=4.83"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 15HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Reach OR1: OVERLAND REACH 1 Inflow Area = 11,462 sf, 42.92% Impervious, Inflow Depth = 0.42" for 10-yr event Inflow = 0.17 cfs @ 12.28 hrs, Volume= 405 cf Outflow = 0.16 cfs @ 12.43 hrs, Volume= 405 cf, Atten= 10%, Lag= 9.1 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Max. Velocity= 0.06 fps, Min. Travel Time= 7.9 min Avg. Velocity = 0.02 fps, Avg. Travel Time= 33.7 min Peak Storage= 75 cf @ 12.43 hrs Average Depth at Peak Storage= 0.25' , Surface Width= 14.91' Bank-Full Depth= 1.00' Flow Area= 20.0 sf, Capacity= 3.25 cfs 30.00' x 1.00' deep Parabolic Channel, n= 0.400 Sheet flow: Woods+light brush Length= 30.4' Slope= 0.0033 '/' Inlet Invert= 461.00', Outlet Invert= 460.90' ‡ 22102 24-hr S1 10-yr Rainfall=4.83"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 16HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Pond IB1: INFIL BASIN 1 Inflow Area = 11,462 sf, 42.92% Impervious, Inflow Depth = 3.12" for 10-yr event Inflow = 0.99 cfs @ 12.03 hrs, Volume= 2,976 cf Outflow = 0.30 cfs @ 12.28 hrs, Volume= 2,976 cf, Atten= 70%, Lag= 14.6 min Discarded = 0.12 cfs @ 12.28 hrs, Volume= 2,570 cf Primary = 0.17 cfs @ 12.28 hrs, Volume= 405 cf Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 461.66' @ 12.28 hrs Surf.Area= 816 sf Storage= 812 cf Flood Elev= 462.75' Surf.Area= 2,164 sf Storage= 1,427 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 53.2 min ( 880.1 - 826.9 ) Volume Invert Avail.Storage Storage Description #1 461.00' 369 cf SEDIMENT FOREBAY (Irregular) Listed below (Recalc) #2 458.16' 1,015 cf Custom Stage Data (Irregular) Listed below (Recalc) #3 458.42' 44 cf 8.0" Round Pipe Storage x 3 L= 42.0' 1,427 cf Total Available Storage Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 461.00 134 94.9 0 0 134 462.00 321 123.9 221 221 651 462.20 1,259 212.6 148 369 3,026 Elevation Surf.Area Perim. Voids Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (%) (cubic-feet) (cubic-feet) (sq-ft) 458.16 395 110.4 0.0 0 0 395 458.17 395 110.4 40.0 2 2 396 459.17 395 110.4 40.0 158 160 507 459.50 395 110.4 40.0 52 212 543 461.00 395 110.4 20.0 119 330 709 462.00 672 141.4 100.0 527 858 1,342 462.20 905 157.8 100.0 157 1,015 1,734 Device Routing Invert Outlet Devices #1 Discarded 458.16'2.410 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 456.90' #2 Primary 461.30'Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.90 0.90 1.45 Width (feet) 0.25 0.25 4.00 4.90 Discarded OutFlow Max=0.12 cfs @ 12.28 hrs HW=461.66' (Free Discharge) 1=Exfiltration ( Controls 0.12 cfs) Primary OutFlow Max=0.17 cfs @ 12.28 hrs HW=461.66' TW=461.22' (Dynamic Tailwater) 2=Custom Weir/Orifice (Weir Controls 0.17 cfs @ 1.96 fps) 22102 24-hr S1 10-yr Rainfall=4.83"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 17HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPA1: DP A1 Inflow Area = 28,095 sf, 16.19% Impervious, Inflow Depth = 2.66" for 10-yr event Inflow = 1.61 cfs @ 12.11 hrs, Volume= 6,218 cf Primary = 1.61 cfs @ 12.11 hrs, Volume= 6,218 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 10-yr Rainfall=4.83"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 18HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPB1: DP B1 Inflow Area = 27,549 sf, 31.75% Impervious, Inflow Depth = 2.11" for 10-yr event Inflow = 1.19 cfs @ 12.09 hrs, Volume= 4,841 cf Primary = 1.19 cfs @ 12.09 hrs, Volume= 4,841 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 25-yr Rainfall=5.95"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 19HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment A1: WSA1 Runoff = 2.18 cfs @ 12.11 hrs, Volume= 8,510 cf, Depth= 3.64" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 25-yr Rainfall=5.95" Area (sf) CN Description 2,474 70 Woods, Good, HSG C 19,642 74 >75% Grass cover, Good, HSG C 1,431 96 Gravel surface, HSG C 292 98 Unconnected pavement, HSG C 4,256 98 Paved parking, HSG C 28,095 79 Weighted Average 23,547 83.81% Pervious Area 4,548 16.19% Impervious Area 292 6.42% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.5 34 0.0265 1.14 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.3 58 0.0362 3.86 Shallow Concentrated Flow, 3 Paved Kv= 20.3 fps 0.6 57 0.0456 1.49 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.1 23 0.0609 5.01 Shallow Concentrated Flow, 5 Paved Kv= 20.3 fps 0.1 17 0.0941 2.15 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.8 38 0.0132 0.80 Shallow Concentrated Flow, 7 Short Grass Pasture Kv= 7.0 fps 0.4 25 0.0200 0.99 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 0.3 35 0.0857 2.05 Shallow Concentrated Flow, 9 Short Grass Pasture Kv= 7.0 fps 1.1 61 0.0164 0.90 Shallow Concentrated Flow, 10 Short Grass Pasture Kv= 7.0 fps 11.3 398 Total 22102 24-hr S1 25-yr Rainfall=5.95"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 20HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment B1: WSB1 Runoff = 1.53 cfs @ 12.09 hrs, Volume= 5,848 cf, Depth= 4.36" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 25-yr Rainfall=5.95" Area (sf) CN Description 600 70 Woods, Good, HSG C 7,133 74 >75% Grass cover, Good, HSG C 133 98 Unconnected pavement, HSG C 2,066 98 Roofs, HSG C 4,526 96 Gravel surface, HSG C 1,629 98 Paved parking, HSG C 16,087 86 Weighted Average 12,259 76.20% Pervious Area 3,828 23.80% Impervious Area 133 3.47% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.4 36 0.0444 1.47 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.7 115 0.0261 2.60 Shallow Concentrated Flow, 3 Unpaved Kv= 16.1 fps 0.5 42 0.0476 1.53 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.2 29 0.1034 2.25 Shallow Concentrated Flow, 5 Short Grass Pasture Kv= 7.0 fps 0.5 44 0.0511 1.58 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.4 71 0.0246 3.18 Shallow Concentrated Flow, 7 Paved Kv= 20.3 fps 0.5 29 0.0172 0.92 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 10.3 416 Total 22102 24-hr S1 25-yr Rainfall=5.95"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 21HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment B2: WSB2 Runoff = 1.28 cfs @ 12.03 hrs, Volume= 3,964 cf, Depth= 4.15" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 25-yr Rainfall=5.95" Area (sf) CN Description 6,542 74 >75% Grass cover, Good, HSG C 912 98 Roofs, HSG C 219 98 Unconnected pavement, HSG C 3,789 98 Paved parking, HSG C 11,462 84 Weighted Average 6,542 57.08% Pervious Area 4,920 42.92% Impervious Area 219 4.45% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.2 38 0.0618 0.15 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.0 13 0.0554 4.78 Shallow Concentrated Flow, 2 Paved Kv= 20.3 fps 0.9 35 0.0080 0.63 Shallow Concentrated Flow, 3 Short Grass Pasture Kv= 7.0 fps 0.3 27 0.0370 1.35 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.1 20 0.1015 2.23 Shallow Concentrated Flow, 5 Short Grass Pasture Kv= 7.0 fps 0.1 20 0.0125 2.27 Shallow Concentrated Flow, 6 Paved Kv= 20.3 fps 0.1 24 0.0217 2.99 Shallow Concentrated Flow, 7 Paved Kv= 20.3 fps 0.0 5 0.2400 3.43 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 5.7 182 Total 22102 24-hr S1 25-yr Rainfall=5.95"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 22HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Reach OR1: OVERLAND REACH 1 Inflow Area = 11,462 sf, 42.92% Impervious, Inflow Depth = 0.94" for 25-yr event Inflow = 0.37 cfs @ 12.20 hrs, Volume= 895 cf Outflow = 0.34 cfs @ 12.32 hrs, Volume= 895 cf, Atten= 8%, Lag= 7.1 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Max. Velocity= 0.08 fps, Min. Travel Time= 6.2 min Avg. Velocity = 0.02 fps, Avg. Travel Time= 28.6 min Peak Storage= 128 cf @ 12.32 hrs Average Depth at Peak Storage= 0.35' , Surface Width= 17.83' Bank-Full Depth= 1.00' Flow Area= 20.0 sf, Capacity= 3.25 cfs 30.00' x 1.00' deep Parabolic Channel, n= 0.400 Sheet flow: Woods+light brush Length= 30.4' Slope= 0.0033 '/' Inlet Invert= 461.00', Outlet Invert= 460.90' ‡ 22102 24-hr S1 25-yr Rainfall=5.95"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 23HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Pond IB1: INFIL BASIN 1 Inflow Area = 11,462 sf, 42.92% Impervious, Inflow Depth = 4.15" for 25-yr event Inflow = 1.28 cfs @ 12.03 hrs, Volume= 3,964 cf Outflow = 0.51 cfs @ 12.20 hrs, Volume= 3,964 cf, Atten= 60%, Lag= 10.0 min Discarded = 0.14 cfs @ 12.20 hrs, Volume= 3,069 cf Primary = 0.37 cfs @ 12.20 hrs, Volume= 895 cf Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 461.89' @ 12.20 hrs Surf.Area= 935 sf Storage= 1,018 cf Flood Elev= 462.75' Surf.Area= 2,164 sf Storage= 1,427 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 52.2 min ( 868.1 - 815.9 ) Volume Invert Avail.Storage Storage Description #1 461.00' 369 cf SEDIMENT FOREBAY (Irregular) Listed below (Recalc) #2 458.16' 1,015 cf Custom Stage Data (Irregular) Listed below (Recalc) #3 458.42' 44 cf 8.0" Round Pipe Storage x 3 L= 42.0' 1,427 cf Total Available Storage Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 461.00 134 94.9 0 0 134 462.00 321 123.9 221 221 651 462.20 1,259 212.6 148 369 3,026 Elevation Surf.Area Perim. Voids Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (%) (cubic-feet) (cubic-feet) (sq-ft) 458.16 395 110.4 0.0 0 0 395 458.17 395 110.4 40.0 2 2 396 459.17 395 110.4 40.0 158 160 507 459.50 395 110.4 40.0 52 212 543 461.00 395 110.4 20.0 119 330 709 462.00 672 141.4 100.0 527 858 1,342 462.20 905 157.8 100.0 157 1,015 1,734 Device Routing Invert Outlet Devices #1 Discarded 458.16'2.410 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 456.90' #2 Primary 461.30'Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.90 0.90 1.45 Width (feet) 0.25 0.25 4.00 4.90 Discarded OutFlow Max=0.14 cfs @ 12.20 hrs HW=461.89' (Free Discharge) 1=Exfiltration ( Controls 0.14 cfs) Primary OutFlow Max=0.37 cfs @ 12.20 hrs HW=461.89' TW=461.32' (Dynamic Tailwater) 2=Custom Weir/Orifice (Weir Controls 0.37 cfs @ 2.52 fps) 22102 24-hr S1 25-yr Rainfall=5.95"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 24HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPA1: DP A1 Inflow Area = 28,095 sf, 16.19% Impervious, Inflow Depth = 3.64" for 25-yr event Inflow = 2.18 cfs @ 12.11 hrs, Volume= 8,510 cf Primary = 2.18 cfs @ 12.11 hrs, Volume= 8,510 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 25-yr Rainfall=5.95"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 25HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPB1: DP B1 Inflow Area = 27,549 sf, 31.75% Impervious, Inflow Depth = 2.94" for 25-yr event Inflow = 1.62 cfs @ 12.10 hrs, Volume= 6,742 cf Primary = 1.62 cfs @ 12.10 hrs, Volume= 6,742 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 50-yr Rainfall=6.98"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 26HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment A1: WSA1 Runoff = 2.73 cfs @ 12.11 hrs, Volume= 10,690 cf, Depth= 4.57" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 50-yr Rainfall=6.98" Area (sf) CN Description 2,474 70 Woods, Good, HSG C 19,642 74 >75% Grass cover, Good, HSG C 1,431 96 Gravel surface, HSG C 292 98 Unconnected pavement, HSG C 4,256 98 Paved parking, HSG C 28,095 79 Weighted Average 23,547 83.81% Pervious Area 4,548 16.19% Impervious Area 292 6.42% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.5 34 0.0265 1.14 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.3 58 0.0362 3.86 Shallow Concentrated Flow, 3 Paved Kv= 20.3 fps 0.6 57 0.0456 1.49 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.1 23 0.0609 5.01 Shallow Concentrated Flow, 5 Paved Kv= 20.3 fps 0.1 17 0.0941 2.15 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.8 38 0.0132 0.80 Shallow Concentrated Flow, 7 Short Grass Pasture Kv= 7.0 fps 0.4 25 0.0200 0.99 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 0.3 35 0.0857 2.05 Shallow Concentrated Flow, 9 Short Grass Pasture Kv= 7.0 fps 1.1 61 0.0164 0.90 Shallow Concentrated Flow, 10 Short Grass Pasture Kv= 7.0 fps 11.3 398 Total 22102 24-hr S1 50-yr Rainfall=6.98"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 27HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment B1: WSB1 Runoff = 1.86 cfs @ 12.09 hrs, Volume= 7,167 cf, Depth= 5.35" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 50-yr Rainfall=6.98" Area (sf) CN Description 600 70 Woods, Good, HSG C 7,133 74 >75% Grass cover, Good, HSG C 133 98 Unconnected pavement, HSG C 2,066 98 Roofs, HSG C 4,526 96 Gravel surface, HSG C 1,629 98 Paved parking, HSG C 16,087 86 Weighted Average 12,259 76.20% Pervious Area 3,828 23.80% Impervious Area 133 3.47% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.4 36 0.0444 1.47 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.7 115 0.0261 2.60 Shallow Concentrated Flow, 3 Unpaved Kv= 16.1 fps 0.5 42 0.0476 1.53 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.2 29 0.1034 2.25 Shallow Concentrated Flow, 5 Short Grass Pasture Kv= 7.0 fps 0.5 44 0.0511 1.58 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.4 71 0.0246 3.18 Shallow Concentrated Flow, 7 Paved Kv= 20.3 fps 0.5 29 0.0172 0.92 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 10.3 416 Total 22102 24-hr S1 50-yr Rainfall=6.98"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 28HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment B2: WSB2 Runoff = 1.56 cfs @ 12.03 hrs, Volume= 4,891 cf, Depth= 5.12" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 50-yr Rainfall=6.98" Area (sf) CN Description 6,542 74 >75% Grass cover, Good, HSG C 912 98 Roofs, HSG C 219 98 Unconnected pavement, HSG C 3,789 98 Paved parking, HSG C 11,462 84 Weighted Average 6,542 57.08% Pervious Area 4,920 42.92% Impervious Area 219 4.45% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.2 38 0.0618 0.15 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.0 13 0.0554 4.78 Shallow Concentrated Flow, 2 Paved Kv= 20.3 fps 0.9 35 0.0080 0.63 Shallow Concentrated Flow, 3 Short Grass Pasture Kv= 7.0 fps 0.3 27 0.0370 1.35 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.1 20 0.1015 2.23 Shallow Concentrated Flow, 5 Short Grass Pasture Kv= 7.0 fps 0.1 20 0.0125 2.27 Shallow Concentrated Flow, 6 Paved Kv= 20.3 fps 0.1 24 0.0217 2.99 Shallow Concentrated Flow, 7 Paved Kv= 20.3 fps 0.0 5 0.2400 3.43 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 5.7 182 Total 22102 24-hr S1 50-yr Rainfall=6.98"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 29HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Reach OR1: OVERLAND REACH 1 Inflow Area = 11,462 sf, 42.92% Impervious, Inflow Depth = 1.45" for 50-yr event Inflow = 0.55 cfs @ 12.17 hrs, Volume= 1,389 cf Outflow = 0.52 cfs @ 12.28 hrs, Volume= 1,389 cf, Atten= 6%, Lag= 6.2 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Max. Velocity= 0.09 fps, Min. Travel Time= 5.5 min Avg. Velocity = 0.02 fps, Avg. Travel Time= 25.7 min Peak Storage= 170 cf @ 12.28 hrs Average Depth at Peak Storage= 0.43' , Surface Width= 19.61' Bank-Full Depth= 1.00' Flow Area= 20.0 sf, Capacity= 3.25 cfs 30.00' x 1.00' deep Parabolic Channel, n= 0.400 Sheet flow: Woods+light brush Length= 30.4' Slope= 0.0033 '/' Inlet Invert= 461.00', Outlet Invert= 460.90' ‡ 22102 24-hr S1 50-yr Rainfall=6.98"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 30HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Pond IB1: INFIL BASIN 1 Inflow Area = 11,462 sf, 42.92% Impervious, Inflow Depth = 5.12" for 50-yr event Inflow = 1.56 cfs @ 12.03 hrs, Volume= 4,891 cf Outflow = 0.71 cfs @ 12.17 hrs, Volume= 4,891 cf, Atten= 54%, Lag= 8.4 min Discarded = 0.16 cfs @ 12.18 hrs, Volume= 3,503 cf Primary = 0.55 cfs @ 12.17 hrs, Volume= 1,389 cf Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 462.07' @ 12.18 hrs Surf.Area= 1,331 sf Storage= 1,204 cf Flood Elev= 462.75' Surf.Area= 2,164 sf Storage= 1,427 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 51.4 min ( 859.3 - 807.9 ) Volume Invert Avail.Storage Storage Description #1 461.00' 369 cf SEDIMENT FOREBAY (Irregular) Listed below (Recalc) #2 458.16' 1,015 cf Custom Stage Data (Irregular) Listed below (Recalc) #3 458.42' 44 cf 8.0" Round Pipe Storage x 3 L= 42.0' 1,427 cf Total Available Storage Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 461.00 134 94.9 0 0 134 462.00 321 123.9 221 221 651 462.20 1,259 212.6 148 369 3,026 Elevation Surf.Area Perim. Voids Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (%) (cubic-feet) (cubic-feet) (sq-ft) 458.16 395 110.4 0.0 0 0 395 458.17 395 110.4 40.0 2 2 396 459.17 395 110.4 40.0 158 160 507 459.50 395 110.4 40.0 52 212 543 461.00 395 110.4 20.0 119 330 709 462.00 672 141.4 100.0 527 858 1,342 462.20 905 157.8 100.0 157 1,015 1,734 Device Routing Invert Outlet Devices #1 Discarded 458.16'2.410 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 456.90' #2 Primary 461.30'Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.90 0.90 1.45 Width (feet) 0.25 0.25 4.00 4.90 Discarded OutFlow Max=0.16 cfs @ 12.18 hrs HW=462.07' (Free Discharge) 1=Exfiltration ( Controls 0.16 cfs) Primary OutFlow Max=0.55 cfs @ 12.17 hrs HW=462.07' TW=461.40' (Dynamic Tailwater) 2=Custom Weir/Orifice (Weir Controls 0.55 cfs @ 2.86 fps) 22102 24-hr S1 50-yr Rainfall=6.98"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 31HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPA1: DP A1 Inflow Area = 28,095 sf, 16.19% Impervious, Inflow Depth = 4.57" for 50-yr event Inflow = 2.73 cfs @ 12.11 hrs, Volume= 10,690 cf Primary = 2.73 cfs @ 12.11 hrs, Volume= 10,690 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 50-yr Rainfall=6.98"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 32HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPB1: DP B1 Inflow Area = 27,549 sf, 31.75% Impervious, Inflow Depth = 3.73" for 50-yr event Inflow = 2.13 cfs @ 12.10 hrs, Volume= 8,556 cf Primary = 2.13 cfs @ 12.10 hrs, Volume= 8,556 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 100-yr Rainfall=8.18"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 33HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment A1: WSA1 Runoff = 3.36 cfs @ 12.11 hrs, Volume= 13,288 cf, Depth= 5.68" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 100-yr Rainfall=8.18" Area (sf) CN Description 2,474 70 Woods, Good, HSG C 19,642 74 >75% Grass cover, Good, HSG C 1,431 96 Gravel surface, HSG C 292 98 Unconnected pavement, HSG C 4,256 98 Paved parking, HSG C 28,095 79 Weighted Average 23,547 83.81% Pervious Area 4,548 16.19% Impervious Area 292 6.42% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.5 34 0.0265 1.14 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.3 58 0.0362 3.86 Shallow Concentrated Flow, 3 Paved Kv= 20.3 fps 0.6 57 0.0456 1.49 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.1 23 0.0609 5.01 Shallow Concentrated Flow, 5 Paved Kv= 20.3 fps 0.1 17 0.0941 2.15 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.8 38 0.0132 0.80 Shallow Concentrated Flow, 7 Short Grass Pasture Kv= 7.0 fps 0.4 25 0.0200 0.99 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 0.3 35 0.0857 2.05 Shallow Concentrated Flow, 9 Short Grass Pasture Kv= 7.0 fps 1.1 61 0.0164 0.90 Shallow Concentrated Flow, 10 Short Grass Pasture Kv= 7.0 fps 11.3 398 Total 22102 24-hr S1 100-yr Rainfall=8.18"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 34HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment B1: WSB1 Runoff = 2.23 cfs @ 12.09 hrs, Volume= 8,722 cf, Depth= 6.51" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 100-yr Rainfall=8.18" Area (sf) CN Description 600 70 Woods, Good, HSG C 7,133 74 >75% Grass cover, Good, HSG C 133 98 Unconnected pavement, HSG C 2,066 98 Roofs, HSG C 4,526 96 Gravel surface, HSG C 1,629 98 Paved parking, HSG C 16,087 86 Weighted Average 12,259 76.20% Pervious Area 3,828 23.80% Impervious Area 133 3.47% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.1 50 0.0280 0.12 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.4 36 0.0444 1.47 Shallow Concentrated Flow, 2 Short Grass Pasture Kv= 7.0 fps 0.7 115 0.0261 2.60 Shallow Concentrated Flow, 3 Unpaved Kv= 16.1 fps 0.5 42 0.0476 1.53 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.2 29 0.1034 2.25 Shallow Concentrated Flow, 5 Short Grass Pasture Kv= 7.0 fps 0.5 44 0.0511 1.58 Shallow Concentrated Flow, 6 Short Grass Pasture Kv= 7.0 fps 0.4 71 0.0246 3.18 Shallow Concentrated Flow, 7 Paved Kv= 20.3 fps 0.5 29 0.0172 0.92 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 10.3 416 Total 22102 24-hr S1 100-yr Rainfall=8.18"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 35HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Subcatchment B2: WSB2 Runoff = 1.87 cfs @ 12.03 hrs, Volume= 5,987 cf, Depth= 6.27" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 100-yr Rainfall=8.18" Area (sf) CN Description 6,542 74 >75% Grass cover, Good, HSG C 912 98 Roofs, HSG C 219 98 Unconnected pavement, HSG C 3,789 98 Paved parking, HSG C 11,462 84 Weighted Average 6,542 57.08% Pervious Area 4,920 42.92% Impervious Area 219 4.45% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.2 38 0.0618 0.15 Sheet Flow, 1 Grass: Dense n= 0.240 P2= 3.23" 0.0 13 0.0554 4.78 Shallow Concentrated Flow, 2 Paved Kv= 20.3 fps 0.9 35 0.0080 0.63 Shallow Concentrated Flow, 3 Short Grass Pasture Kv= 7.0 fps 0.3 27 0.0370 1.35 Shallow Concentrated Flow, 4 Short Grass Pasture Kv= 7.0 fps 0.1 20 0.1015 2.23 Shallow Concentrated Flow, 5 Short Grass Pasture Kv= 7.0 fps 0.1 20 0.0125 2.27 Shallow Concentrated Flow, 6 Paved Kv= 20.3 fps 0.1 24 0.0217 2.99 Shallow Concentrated Flow, 7 Paved Kv= 20.3 fps 0.0 5 0.2400 3.43 Shallow Concentrated Flow, 8 Short Grass Pasture Kv= 7.0 fps 5.7 182 Total 22102 24-hr S1 100-yr Rainfall=8.18"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 36HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Reach OR1: OVERLAND REACH 1 Inflow Area = 11,462 sf, 42.92% Impervious, Inflow Depth = 2.05" for 100-yr event Inflow = 0.68 cfs @ 12.17 hrs, Volume= 1,958 cf Outflow = 0.66 cfs @ 12.26 hrs, Volume= 1,958 cf, Atten= 4%, Lag= 5.6 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Max. Velocity= 0.10 fps, Min. Travel Time= 5.1 min Avg. Velocity = 0.02 fps, Avg. Travel Time= 23.3 min Peak Storage= 201 cf @ 12.26 hrs Average Depth at Peak Storage= 0.48' , Surface Width= 20.73' Bank-Full Depth= 1.00' Flow Area= 20.0 sf, Capacity= 3.25 cfs 30.00' x 1.00' deep Parabolic Channel, n= 0.400 Sheet flow: Woods+light brush Length= 30.4' Slope= 0.0033 '/' Inlet Invert= 461.00', Outlet Invert= 460.90' ‡ 22102 24-hr S1 100-yr Rainfall=8.18"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 37HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Pond IB1: INFIL BASIN 1 Inflow Area = 11,462 sf, 42.92% Impervious, Inflow Depth = 6.27" for 100-yr event Inflow = 1.87 cfs @ 12.03 hrs, Volume= 5,987 cf Outflow = 0.89 cfs @ 12.17 hrs, Volume= 5,987 cf, Atten= 52%, Lag= 8.1 min Discarded = 0.21 cfs @ 12.17 hrs, Volume= 4,030 cf Primary = 0.68 cfs @ 12.17 hrs, Volume= 1,958 cf Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs Peak Elev= 462.19' @ 12.17 hrs Surf.Area= 2,108 sf Storage= 1,411 cf Flood Elev= 462.75' Surf.Area= 2,164 sf Storage= 1,427 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 50.8 min ( 851.3 - 800.5 ) Volume Invert Avail.Storage Storage Description #1 461.00' 369 cf SEDIMENT FOREBAY (Irregular) Listed below (Recalc) #2 458.16' 1,015 cf Custom Stage Data (Irregular) Listed below (Recalc) #3 458.42' 44 cf 8.0" Round Pipe Storage x 3 L= 42.0' 1,427 cf Total Available Storage Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft) 461.00 134 94.9 0 0 134 462.00 321 123.9 221 221 651 462.20 1,259 212.6 148 369 3,026 Elevation Surf.Area Perim. Voids Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (feet) (%) (cubic-feet) (cubic-feet) (sq-ft) 458.16 395 110.4 0.0 0 0 395 458.17 395 110.4 40.0 2 2 396 459.17 395 110.4 40.0 158 160 507 459.50 395 110.4 40.0 52 212 543 461.00 395 110.4 20.0 119 330 709 462.00 672 141.4 100.0 527 858 1,342 462.20 905 157.8 100.0 157 1,015 1,734 Device Routing Invert Outlet Devices #1 Discarded 458.16'2.410 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 456.90' #2 Primary 461.30'Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 0.90 0.90 1.45 Width (feet) 0.25 0.25 4.00 4.90 Discarded OutFlow Max=0.21 cfs @ 12.17 hrs HW=462.19' (Free Discharge) 1=Exfiltration ( Controls 0.21 cfs) Primary OutFlow Max=0.68 cfs @ 12.17 hrs HW=462.19' TW=461.46' (Dynamic Tailwater) 2=Custom Weir/Orifice (Weir Controls 0.68 cfs @ 3.05 fps) 22102 24-hr S1 100-yr Rainfall=8.18"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 38HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPA1: DP A1 Inflow Area = 28,095 sf, 16.19% Impervious, Inflow Depth = 5.68" for 100-yr event Inflow = 3.36 cfs @ 12.11 hrs, Volume= 13,288 cf Primary = 3.36 cfs @ 12.11 hrs, Volume= 13,288 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs 22102 24-hr S1 100-yr Rainfall=8.18"22102-POST Printed 2/13/2023Prepared by {enter your company name here} Page 39HydroCAD® 10.10-5a s/n 03240 © 2020 HydroCAD Software Solutions LLC Summary for Link DPB1: DP B1 Inflow Area = 27,549 sf, 31.75% Impervious, Inflow Depth = 4.65" for 100-yr event Inflow = 2.69 cfs @ 12.10 hrs, Volume= 10,680 cf Primary = 2.69 cfs @ 12.10 hrs, Volume= 10,680 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-48.00 hrs, dt= 0.01 hrs