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HomeMy WebLinkAbout25IWC7-Silver Falls Rd - Drainage ReportDate: April 10, 2025 Page 1 of 2 Drainage Report Map 001- Block 007- Lot 00A Silver Falls Road Proposed Subdivision CLA Engineers, Inc. Civil · Structural · Survey DRAINAGE REPORT Proposed Subdivision Silver Falls Road Montville, Connecticut Prepared for Daniela Gjergjaj Narrative The proposed project is a residential subdivision located on Silver Falls Road (Map 001, Block 007, Lot 00A) in Montville Connecticut. The existing property is approximately 19-acres bounded by Silver Falls Road to the west. The location of the site in reference to the USGS Quad Map is attached as Figure 1. Existing conditions mapping is included in the subdivision plans. The existing site is generally comprised of wooded land with grass & brush. The property is divided by a ridgeline forming 2 watersheds on the property; existing ground elevations on the site range from approximately 212 to 118. Stormwater from the site currently flows via sheet flow to the from the ridgeline to the 24” HDPE on the west and to the wetlands to the east. The proposed development includes a 4-lot residential subdivision. The proposed lots will all front along Silver Falls Road and be served by a common driveway. There is no proposed roadway or public improvements. The proposed site grading has been designed to match the existing drainage patterns as closely as possible. The lot layouts and grading are depicted in the subdivision plans. As a low impact development measure stormwater throughout the site will continue to be managed by sheet flow over and treated by riprap swales and a water quality basin near the wetlands near Silver Falls Road. The watershed #1 draining to the existing 24” hdpe is approximately 129 acres. The proposed development will disturb approximately 4.4 acres within this watershed. The land use within the work area will change from primarily woods, brush, and grass to residential that includes approximately 2 acres of lawn within the development. Based on the magnitude of the development within the watershed and the difference in land use for the residential development, the impact to the peak stormwater runoff rates will be negligible. In our opinion the proposed development will have no negative impact to the peak flow rates to the existing pond, wetlands, 24” hdpe, and existing beyond the downstream property boundary. The watershed #2 draining to northeasterly wetlands is approximately 257 acres. The proposed development will disturb approximately 1.0 acre within this watershed. The land use within the work area will change from primarily woods, brush, and grass to residential that includes approximately .5 acres of lawn within the development. Based on the magnitude of the Date: April 10, 2025 Page 2 of 2 Drainage Report Map 001- Block 007- Lot 00A Silver Falls Road Proposed Subdivision CLA Engineers, Inc. Civil · Structural · Survey development within the watershed and the difference in land use for the residential development, the impact to the peak stormwater runoff rates will be negligible. In our opinion the proposed development will have no negative impact on the peak flow rates to the existing wetlands or existing land beyond the downstream boundary. Method: The site hydraulic analysis was performed using the SCS TR-55 method utilizing the Hydraflow Hydrographs Extension for AutoCAD. Water quality volume and groundwater recharge volume calculations were performed as outlined in the 2024 Connecticut Stormwater Quality Manual (Section 7.4.1 and Section 7.5.1 respectively). Runoff curve numbers for the existing conditions and post development conditions were compiled from Table 2-2 of TR-55 due to the minimal changes within the watershed the composite curve numbers remained the same for both pre and post construction. Stormwater Quality To meet the Connecticut DEEP stormwater discharge water quality requirements low impact development measures have been designed for the site in accordance with the 2024 Connecticut Stormwater Quality Manual to treat the proposed run-off. Stormwater run-off from each area of development will run to a water quality basin or underground chambers designed to treat water quality volumes as shown on the subdivision plans. Water quality volumes are shown on the detail sheet of the subdivision plans. CLA Engineers, Inc. Robert A. DeLuca, P.E. Hydrograph Summary Report 1 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 3.955 6 792 75,908 ------ ------ ------ Existing Watershed #1 2 SCS Runoff 7.047 6 828 152,683 ------ ------ ------ Existing watershed #2 3 SCS Runoff 3.955 6 792 75,908 ------ ------ ------ Proposed Watershed #1 4 SCS Runoff 7.047 6 828 152,683 ------ ------ ------ Proposed Watershed #2 7885 Hydrographs.gpw Return Period: 1 Year Tuesday, 04 / 8 / 2025 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 1 Existing Watershed #1 Hydrograph type = SCS Runoff Peak discharge = 3.955 cfs Storm frequency = 1 yrs Time to peak = 792 min Time interval = 6 min Hyd. volume = 75,908 cuft Drainage area = 129.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 46.90 min Total precip. = 2.89 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(129.000 x 55)] / 129.000 2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 Q (cfs) Time (min) Existing Watershed #1 Hyd. No. 1 -- 1 Year Hyd No. 1 TR55 Tc Worksheet 3 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Hyd. No. 1 Existing Watershed #1 Description A B C Totals Sheet Flow Manning's n-value = 0.800 0.011 0.011 Flow length (ft) = 150.0 0.0 0.0 Two-year 24-hr precip. (in) = 3.37 0.00 0.00 Land slope (%) = 4.00 0.00 0.00 Travel Time (min)=38.19 +0.00 +0.00 =38.19 Shallow Concentrated Flow Flow length (ft) = 670.00 880.00 0.00 Watercourse slope (%) = 4.20 7.00 0.00 Surface description = Unpaved Unpaved Paved Average velocity (ft/s)=3.31 4.27 0.00 Travel Time (min)=3.38 +3.44 +0.00 =6.81 Channel Flow X sectional flow area (sqft) = 16.00 0.00 0.00 Wetted perimeter (ft) = 8.00 0.00 0.00 Channel slope (%) = 7.40 0.00 0.00 Manning's n-value = 0.050 0.015 0.015 Velocity (ft/s)=12.90 0.00 0.00 Flow length (ft) ({0})1430.0 0.0 0.0 Travel Time (min)=1.85 +0.00 +0.00 =1.85 Total Travel Time, Tc .............................................................................. 46.90 min Precipitation Report 4 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 1 Existing Watershed #1 Storm Frequency = 1 yrs Time interval = 6 min Total precip. = 2.8900 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.05 0.05 0.10 0.10 0.15 0.15 0.20 0.20 0.25 0.25 0.30 0.30 0.35 0.35 0.40 0.40 0.45 0.45 0.50 0.50 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 1 : Existing Watershed #1 - 1 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 2 Existing watershed #2 Hydrograph type = SCS Runoff Peak discharge = 7.047 cfs Storm frequency = 1 yrs Time to peak = 828 min Time interval = 6 min Hyd. volume = 152,683 cuft Drainage area = 257.000 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 76.40 min Total precip. = 2.89 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 5 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 Q (cfs) Time (min) Existing watershed #2 Hyd. No. 2 -- 1 Year Hyd No. 2 TR55 Tc Worksheet 6 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Hyd. No. 2 Existing watershed #2 Description A B C Totals Sheet Flow Manning's n-value = 0.800 0.011 0.011 Flow length (ft) = 150.0 0.0 0.0 Two-year 24-hr precip. (in) = 3.37 0.00 0.00 Land slope (%) = 5.30 0.00 0.00 Travel Time (min)=34.12 +0.00 +0.00 =34.12 Shallow Concentrated Flow Flow length (ft) = 1040.00 1200.00 3250.00 Watercourse slope (%) = 4.20 12.70 1.00 Surface description = Unpaved Unpaved Unpaved Average velocity (ft/s)=3.31 5.75 1.61 Travel Time (min)=5.24 +3.48 +33.57 =42.29 Channel Flow X sectional flow area (sqft) = 0.00 0.00 0.00 Wetted perimeter (ft) = 0.00 0.00 0.00 Channel slope (%) = 0.00 0.00 0.00 Manning's n-value = 0.015 0.015 0.015 Velocity (ft/s)=0.00 0.00 0.00 Flow length (ft) ({0})0.0 0.0 0.0 Travel Time (min)=0.00 +0.00 +0.00 =0.00 Total Travel Time, Tc .............................................................................. 76.40 min Precipitation Report 7 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 2 Existing watershed #2 Storm Frequency = 1 yrs Time interval = 6 min Total precip. = 2.8900 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.05 0.05 0.10 0.10 0.15 0.15 0.20 0.20 0.25 0.25 0.30 0.30 0.35 0.35 0.40 0.40 0.45 0.45 0.50 0.50 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 2 : Existing watershed #2 - 1 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 3 Proposed Watershed #1 Hydrograph type = SCS Runoff Peak discharge = 3.955 cfs Storm frequency = 1 yrs Time to peak = 792 min Time interval = 6 min Hyd. volume = 75,908 cuft Drainage area = 129.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 46.90 min Total precip. = 2.89 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(1.000 x 98) + (3.400 x 61) + (124.600 x 55)] / 129.000 8 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 Q (cfs) Time (min) Proposed Watershed #1 Hyd. No. 3 -- 1 Year Hyd No. 3 Precipitation Report 9 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 3 Proposed Watershed #1 Storm Frequency = 1 yrs Time interval = 6 min Total precip. = 2.8900 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.05 0.05 0.10 0.10 0.15 0.15 0.20 0.20 0.25 0.25 0.30 0.30 0.35 0.35 0.40 0.40 0.45 0.45 0.50 0.50 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 3 : Proposed Watershed #1 - 1 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 4 Proposed Watershed #2 Hydrograph type = SCS Runoff Peak discharge = 7.047 cfs Storm frequency = 1 yrs Time to peak = 828 min Time interval = 6 min Hyd. volume = 152,683 cuft Drainage area = 257.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 76.40 min Total precip. = 2.89 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(0.850 x 61) + (1.000 x 98) + (255.150 x 55)] / 257.000 10 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 Q (cfs) Time (min) Proposed Watershed #2 Hyd. No. 4 -- 1 Year Hyd No. 4 TR55 Tc Worksheet 11 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Hyd. No. 4 Proposed Watershed #2 Description A B C Totals Sheet Flow Manning's n-value = 0.000 0.000 0.000 Flow length (ft) = 0.0 0.0 0.0 Two-year 24-hr precip. (in) = 0.00 0.00 0.00 Land slope (%) = 0.00 0.00 0.00 Travel Time (min)=0.00 +0.00 +0.00 =0.00 Shallow Concentrated Flow Flow length (ft) = 0.00 0.00 0.00 Watercourse slope (%) = 0.00 0.00 0.00 Surface description = Average velocity (ft/s)=0.00 0.00 0.00 Travel Time (min)=0.00 +0.00 +0.00 =0.00 Channel Flow X sectional flow area (sqft) = 0.00 0.00 0.00 Wetted perimeter (ft) = 0.00 0.00 0.00 Channel slope (%) = 0.00 0.00 0.00 Manning's n-value = 0.000 0.000 0.000 Velocity (ft/s)=0.00 0.00 0.00 Flow length (ft) ({0})0.0 0.0 0.0 Travel Time (min)=0.00 +0.00 +0.00 =0.00 Total Travel Time, Tc .............................................................................. 76.40 min Precipitation Report 12 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 4 Proposed Watershed #2 Storm Frequency = 1 yrs Time interval = 6 min Total precip. = 2.8900 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.05 0.05 0.10 0.10 0.15 0.15 0.20 0.20 0.25 0.25 0.30 0.30 0.35 0.35 0.40 0.40 0.45 0.45 0.50 0.50 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 4 : Proposed Watershed #2 - 1 Year Hydrograph Summary Report 13 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 10.87 6 774 150,229 ------ ------ ------ Existing Watershed #1 2 SCS Runoff 18.07 6 804 302,172 ------ ------ ------ Existing watershed #2 3 SCS Runoff 10.87 6 774 150,229 ------ ------ ------ Proposed Watershed #1 4 SCS Runoff 18.07 6 804 302,172 ------ ------ ------ Proposed Watershed #2 7885 Hydrographs.gpw Return Period: 2 Year Tuesday, 04 / 8 / 2025 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 1 Existing Watershed #1 Hydrograph type = SCS Runoff Peak discharge = 10.87 cfs Storm frequency = 2 yrs Time to peak = 774 min Time interval = 6 min Hyd. volume = 150,229 cuft Drainage area = 129.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 46.90 min Total precip. = 3.45 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(129.000 x 55)] / 129.000 14 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 10.00 10.00 12.00 12.00 Q (cfs) Time (min) Existing Watershed #1 Hyd. No. 1 -- 2 Year Hyd No. 1 Precipitation Report 15 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 1 Existing Watershed #1 Storm Frequency = 2 yrs Time interval = 6 min Total precip. = 3.4500 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.05 0.05 0.10 0.10 0.15 0.15 0.20 0.20 0.25 0.25 0.30 0.30 0.35 0.35 0.40 0.40 0.45 0.45 0.50 0.50 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 1 : Existing Watershed #1 - 2 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 2 Existing watershed #2 Hydrograph type = SCS Runoff Peak discharge = 18.07 cfs Storm frequency = 2 yrs Time to peak = 804 min Time interval = 6 min Hyd. volume = 302,172 cuft Drainage area = 257.000 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 76.40 min Total precip. = 3.45 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 16 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 3.00 3.00 6.00 6.00 9.00 9.00 12.00 12.00 15.00 15.00 18.00 18.00 21.00 21.00 Q (cfs) Time (min) Existing watershed #2 Hyd. No. 2 -- 2 Year Hyd No. 2 Precipitation Report 17 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 2 Existing watershed #2 Storm Frequency = 2 yrs Time interval = 6 min Total precip. = 3.4500 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.05 0.05 0.10 0.10 0.15 0.15 0.20 0.20 0.25 0.25 0.30 0.30 0.35 0.35 0.40 0.40 0.45 0.45 0.50 0.50 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 2 : Existing watershed #2 - 2 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 3 Proposed Watershed #1 Hydrograph type = SCS Runoff Peak discharge = 10.87 cfs Storm frequency = 2 yrs Time to peak = 774 min Time interval = 6 min Hyd. volume = 150,229 cuft Drainage area = 129.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 46.90 min Total precip. = 3.45 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(1.000 x 98) + (3.400 x 61) + (124.600 x 55)] / 129.000 18 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 10.00 10.00 12.00 12.00 Q (cfs) Time (min) Proposed Watershed #1 Hyd. No. 3 -- 2 Year Hyd No. 3 Precipitation Report 19 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 3 Proposed Watershed #1 Storm Frequency = 2 yrs Time interval = 6 min Total precip. = 3.4500 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.05 0.05 0.10 0.10 0.15 0.15 0.20 0.20 0.25 0.25 0.30 0.30 0.35 0.35 0.40 0.40 0.45 0.45 0.50 0.50 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 3 : Proposed Watershed #1 - 2 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 4 Proposed Watershed #2 Hydrograph type = SCS Runoff Peak discharge = 18.07 cfs Storm frequency = 2 yrs Time to peak = 804 min Time interval = 6 min Hyd. volume = 302,172 cuft Drainage area = 257.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 76.40 min Total precip. = 3.45 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(0.850 x 61) + (1.000 x 98) + (255.150 x 55)] / 257.000 20 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 3.00 3.00 6.00 6.00 9.00 9.00 12.00 12.00 15.00 15.00 18.00 18.00 21.00 21.00 Q (cfs) Time (min) Proposed Watershed #2 Hyd. No. 4 -- 2 Year Hyd No. 4 Precipitation Report 21 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 4 Proposed Watershed #2 Storm Frequency = 2 yrs Time interval = 6 min Total precip. = 3.4500 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.05 0.05 0.10 0.10 0.15 0.15 0.20 0.20 0.25 0.25 0.30 0.30 0.35 0.35 0.40 0.40 0.45 0.45 0.50 0.50 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 4 : Proposed Watershed #2 - 2 Year Hydrograph Summary Report 22 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 30.69 6 762 312,529 ------ ------ ------ Existing Watershed #1 2 SCS Runoff 47.71 6 792 628,622 ------ ------ ------ Existing watershed #2 3 SCS Runoff 30.69 6 762 312,529 ------ ------ ------ Proposed Watershed #1 4 SCS Runoff 47.71 6 792 628,622 ------ ------ ------ Proposed Watershed #2 7885 Hydrographs.gpw Return Period: 5 Year Tuesday, 04 / 8 / 2025 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 1 Existing Watershed #1 Hydrograph type = SCS Runoff Peak discharge = 30.69 cfs Storm frequency = 5 yrs Time to peak = 762 min Time interval = 6 min Hyd. volume = 312,529 cuft Drainage area = 129.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 46.90 min Total precip. = 4.37 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(129.000 x 55)] / 129.000 23 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 5.00 5.00 10.00 10.00 15.00 15.00 20.00 20.00 25.00 25.00 30.00 30.00 35.00 35.00 Q (cfs) Time (min) Existing Watershed #1 Hyd. No. 1 -- 5 Year Hyd No. 1 Precipitation Report 24 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 1 Existing Watershed #1 Storm Frequency = 5 yrs Time interval = 6 min Total precip. = 4.3700 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.05 0.05 0.10 0.10 0.15 0.15 0.20 0.20 0.25 0.25 0.30 0.30 0.35 0.35 0.40 0.40 0.45 0.45 0.50 0.50 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 1 : Existing Watershed #1 - 5 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 2 Existing watershed #2 Hydrograph type = SCS Runoff Peak discharge = 47.71 cfs Storm frequency = 5 yrs Time to peak = 792 min Time interval = 6 min Hyd. volume = 628,622 cuft Drainage area = 257.000 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 76.40 min Total precip. = 4.37 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 25 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 Q (cfs) Time (min) Existing watershed #2 Hyd. No. 2 -- 5 Year Hyd No. 2 Precipitation Report 26 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 2 Existing watershed #2 Storm Frequency = 5 yrs Time interval = 6 min Total precip. = 4.3700 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.05 0.05 0.10 0.10 0.15 0.15 0.20 0.20 0.25 0.25 0.30 0.30 0.35 0.35 0.40 0.40 0.45 0.45 0.50 0.50 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 2 : Existing watershed #2 - 5 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 3 Proposed Watershed #1 Hydrograph type = SCS Runoff Peak discharge = 30.69 cfs Storm frequency = 5 yrs Time to peak = 762 min Time interval = 6 min Hyd. volume = 312,529 cuft Drainage area = 129.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 46.90 min Total precip. = 4.37 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(1.000 x 98) + (3.400 x 61) + (124.600 x 55)] / 129.000 27 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 5.00 5.00 10.00 10.00 15.00 15.00 20.00 20.00 25.00 25.00 30.00 30.00 35.00 35.00 Q (cfs) Time (min) Proposed Watershed #1 Hyd. No. 3 -- 5 Year Hyd No. 3 Precipitation Report 28 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 3 Proposed Watershed #1 Storm Frequency = 5 yrs Time interval = 6 min Total precip. = 4.3700 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.05 0.05 0.10 0.10 0.15 0.15 0.20 0.20 0.25 0.25 0.30 0.30 0.35 0.35 0.40 0.40 0.45 0.45 0.50 0.50 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 3 : Proposed Watershed #1 - 5 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 4 Proposed Watershed #2 Hydrograph type = SCS Runoff Peak discharge = 47.71 cfs Storm frequency = 5 yrs Time to peak = 792 min Time interval = 6 min Hyd. volume = 628,622 cuft Drainage area = 257.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 76.40 min Total precip. = 4.37 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(0.850 x 61) + (1.000 x 98) + (255.150 x 55)] / 257.000 29 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 Q (cfs) Time (min) Proposed Watershed #2 Hyd. No. 4 -- 5 Year Hyd No. 4 Precipitation Report 30 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 4 Proposed Watershed #2 Storm Frequency = 5 yrs Time interval = 6 min Total precip. = 4.3700 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.05 0.05 0.10 0.10 0.15 0.15 0.20 0.20 0.25 0.25 0.30 0.30 0.35 0.35 0.40 0.40 0.45 0.45 0.50 0.50 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 4 : Proposed Watershed #2 - 5 Year Hydrograph Summary Report 31 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 53.72 6 756 479,613 ------ ------ ------ Existing Watershed #1 2 SCS Runoff 81.68 6 786 964,695 ------ ------ ------ Existing watershed #2 3 SCS Runoff 53.72 6 756 479,613 ------ ------ ------ Proposed Watershed #1 4 SCS Runoff 81.68 6 786 964,695 ------ ------ ------ Proposed Watershed #2 7885 Hydrographs.gpw Return Period: 10 Year Tuesday, 04 / 8 / 2025 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 1 Existing Watershed #1 Hydrograph type = SCS Runoff Peak discharge = 53.72 cfs Storm frequency = 10 yrs Time to peak = 756 min Time interval = 6 min Hyd. volume = 479,613 cuft Drainage area = 129.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 46.90 min Total precip. = 5.14 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(129.000 x 55)] / 129.000 32 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 60.00 60.00 Q (cfs) Time (min) Existing Watershed #1 Hyd. No. 1 -- 10 Year Hyd No. 1 Precipitation Report 33 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 1 Existing Watershed #1 Storm Frequency = 10 yrs Time interval = 6 min Total precip. = 5.1400 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 1 : Existing Watershed #1 - 10 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 2 Existing watershed #2 Hydrograph type = SCS Runoff Peak discharge = 81.68 cfs Storm frequency = 10 yrs Time to peak = 786 min Time interval = 6 min Hyd. volume = 964,695 cuft Drainage area = 257.000 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 76.40 min Total precip. = 5.14 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 34 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 60.00 60.00 70.00 70.00 80.00 80.00 90.00 90.00 Q (cfs) Time (min) Existing watershed #2 Hyd. No. 2 -- 10 Year Hyd No. 2 Precipitation Report 35 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 2 Existing watershed #2 Storm Frequency = 10 yrs Time interval = 6 min Total precip. = 5.1400 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 2 : Existing watershed #2 - 10 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 3 Proposed Watershed #1 Hydrograph type = SCS Runoff Peak discharge = 53.72 cfs Storm frequency = 10 yrs Time to peak = 756 min Time interval = 6 min Hyd. volume = 479,613 cuft Drainage area = 129.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 46.90 min Total precip. = 5.14 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(1.000 x 98) + (3.400 x 61) + (124.600 x 55)] / 129.000 36 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 60.00 60.00 Q (cfs) Time (min) Proposed Watershed #1 Hyd. No. 3 -- 10 Year Hyd No. 3 Precipitation Report 37 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 3 Proposed Watershed #1 Storm Frequency = 10 yrs Time interval = 6 min Total precip. = 5.1400 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 3 : Proposed Watershed #1 - 10 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 4 Proposed Watershed #2 Hydrograph type = SCS Runoff Peak discharge = 81.68 cfs Storm frequency = 10 yrs Time to peak = 786 min Time interval = 6 min Hyd. volume = 964,695 cuft Drainage area = 257.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 76.40 min Total precip. = 5.14 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(0.850 x 61) + (1.000 x 98) + (255.150 x 55)] / 257.000 38 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 60.00 60.00 70.00 70.00 80.00 80.00 90.00 90.00 Q (cfs) Time (min) Proposed Watershed #2 Hyd. No. 4 -- 10 Year Hyd No. 4 Precipitation Report 39 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 4 Proposed Watershed #2 Storm Frequency = 10 yrs Time interval = 6 min Total precip. = 5.1400 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 4 : Proposed Watershed #2 - 10 Year Hydrograph Summary Report 40 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 91.80 6 756 743,326 ------ ------ ------ Existing Watershed #1 2 SCS Runoff 138.27 6 780 1,495,130 ------ ------ ------ Existing watershed #2 3 SCS Runoff 91.80 6 756 743,326 ------ ------ ------ Proposed Watershed #1 4 SCS Runoff 138.27 6 780 1,495,130 ------ ------ ------ Proposed Watershed #2 7885 Hydrographs.gpw Return Period: 25 Year Tuesday, 04 / 8 / 2025 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 1 Existing Watershed #1 Hydrograph type = SCS Runoff Peak discharge = 91.80 cfs Storm frequency = 25 yrs Time to peak = 756 min Time interval = 6 min Hyd. volume = 743,326 cuft Drainage area = 129.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 46.90 min Total precip. = 6.19 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(129.000 x 55)] / 129.000 41 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 60.00 60.00 70.00 70.00 80.00 80.00 90.00 90.00 100.00 100.00 Q (cfs) Time (min) Existing Watershed #1 Hyd. No. 1 -- 25 Year Hyd No. 1 Precipitation Report 42 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 1 Existing Watershed #1 Storm Frequency = 25 yrs Time interval = 6 min Total precip. = 6.1900 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 1 : Existing Watershed #1 - 25 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 2 Existing watershed #2 Hydrograph type = SCS Runoff Peak discharge = 138.27 cfs Storm frequency = 25 yrs Time to peak = 780 min Time interval = 6 min Hyd. volume = 1,495,130 cuft Drainage area = 257.000 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 76.40 min Total precip. = 6.19 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 43 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 120.00 120.00 140.00 140.00 Q (cfs) Time (min) Existing watershed #2 Hyd. No. 2 -- 25 Year Hyd No. 2 Precipitation Report 44 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 2 Existing watershed #2 Storm Frequency = 25 yrs Time interval = 6 min Total precip. = 6.1900 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 2 : Existing watershed #2 - 25 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 3 Proposed Watershed #1 Hydrograph type = SCS Runoff Peak discharge = 91.80 cfs Storm frequency = 25 yrs Time to peak = 756 min Time interval = 6 min Hyd. volume = 743,326 cuft Drainage area = 129.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 46.90 min Total precip. = 6.19 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(1.000 x 98) + (3.400 x 61) + (124.600 x 55)] / 129.000 45 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 60.00 60.00 70.00 70.00 80.00 80.00 90.00 90.00 100.00 100.00 Q (cfs) Time (min) Proposed Watershed #1 Hyd. No. 3 -- 25 Year Hyd No. 3 Precipitation Report 46 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 3 Proposed Watershed #1 Storm Frequency = 25 yrs Time interval = 6 min Total precip. = 6.1900 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 3 : Proposed Watershed #1 - 25 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 4 Proposed Watershed #2 Hydrograph type = SCS Runoff Peak discharge = 138.27 cfs Storm frequency = 25 yrs Time to peak = 780 min Time interval = 6 min Hyd. volume = 1,495,130 cuft Drainage area = 257.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 76.40 min Total precip. = 6.19 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(0.850 x 61) + (1.000 x 98) + (255.150 x 55)] / 257.000 47 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 120.00 120.00 140.00 140.00 Q (cfs) Time (min) Proposed Watershed #2 Hyd. No. 4 -- 25 Year Hyd No. 4 Precipitation Report 48 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 4 Proposed Watershed #2 Storm Frequency = 25 yrs Time interval = 6 min Total precip. = 6.1900 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 4 : Proposed Watershed #2 - 25 Year Hydrograph Summary Report 49 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 123.39 6 756 963,867 ------ ------ ------ Existing Watershed #1 2 SCS Runoff 186.07 6 774 1,938,727 ------ ------ ------ Existing watershed #2 3 SCS Runoff 123.39 6 756 963,867 ------ ------ ------ Proposed Watershed #1 4 SCS Runoff 186.07 6 774 1,938,727 ------ ------ ------ Proposed Watershed #2 7885 Hydrographs.gpw Return Period: 50 Year Tuesday, 04 / 8 / 2025 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 1 Existing Watershed #1 Hydrograph type = SCS Runoff Peak discharge = 123.39 cfs Storm frequency = 50 yrs Time to peak = 756 min Time interval = 6 min Hyd. volume = 963,867 cuft Drainage area = 129.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 46.90 min Total precip. = 6.98 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(129.000 x 55)] / 129.000 50 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 120.00 120.00 140.00 140.00 Q (cfs) Time (min) Existing Watershed #1 Hyd. No. 1 -- 50 Year Hyd No. 1 Precipitation Report 51 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 1 Existing Watershed #1 Storm Frequency = 50 yrs Time interval = 6 min Total precip. = 6.9800 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 1 : Existing Watershed #1 - 50 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 2 Existing watershed #2 Hydrograph type = SCS Runoff Peak discharge = 186.07 cfs Storm frequency = 50 yrs Time to peak = 774 min Time interval = 6 min Hyd. volume = 1,938,727 cuft Drainage area = 257.000 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 76.40 min Total precip. = 6.98 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 52 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 30.00 30.00 60.00 60.00 90.00 90.00 120.00 120.00 150.00 150.00 180.00 180.00 210.00 210.00 Q (cfs) Time (min) Existing watershed #2 Hyd. No. 2 -- 50 Year Hyd No. 2 Precipitation Report 53 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 2 Existing watershed #2 Storm Frequency = 50 yrs Time interval = 6 min Total precip. = 6.9800 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 2 : Existing watershed #2 - 50 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 3 Proposed Watershed #1 Hydrograph type = SCS Runoff Peak discharge = 123.39 cfs Storm frequency = 50 yrs Time to peak = 756 min Time interval = 6 min Hyd. volume = 963,867 cuft Drainage area = 129.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 46.90 min Total precip. = 6.98 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(1.000 x 98) + (3.400 x 61) + (124.600 x 55)] / 129.000 54 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 120.00 120.00 140.00 140.00 Q (cfs) Time (min) Proposed Watershed #1 Hyd. No. 3 -- 50 Year Hyd No. 3 Precipitation Report 55 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 3 Proposed Watershed #1 Storm Frequency = 50 yrs Time interval = 6 min Total precip. = 6.9800 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 3 : Proposed Watershed #1 - 50 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 4 Proposed Watershed #2 Hydrograph type = SCS Runoff Peak discharge = 186.07 cfs Storm frequency = 50 yrs Time to peak = 774 min Time interval = 6 min Hyd. volume = 1,938,727 cuft Drainage area = 257.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 76.40 min Total precip. = 6.98 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(0.850 x 61) + (1.000 x 98) + (255.150 x 55)] / 257.000 56 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 30.00 30.00 60.00 60.00 90.00 90.00 120.00 120.00 150.00 150.00 180.00 180.00 210.00 210.00 Q (cfs) Time (min) Proposed Watershed #2 Hyd. No. 4 -- 50 Year Hyd No. 4 Precipitation Report 57 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 4 Proposed Watershed #2 Storm Frequency = 50 yrs Time interval = 6 min Total precip. = 6.9800 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 4 : Proposed Watershed #2 - 50 Year Hydrograph Summary Report 58 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 159.71 6 750 1,215,255 ------ ------ ------ Existing Watershed #1 2 SCS Runoff 241.25 6 774 2,444,370 ------ ------ ------ Existing watershed #2 3 SCS Runoff 159.71 6 750 1,215,255 ------ ------ ------ Proposed Watershed #1 4 SCS Runoff 241.25 6 774 2,444,370 ------ ------ ------ Proposed Watershed #2 7885 Hydrographs.gpw Return Period: 100 Year Tuesday, 04 / 8 / 2025 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 1 Existing Watershed #1 Hydrograph type = SCS Runoff Peak discharge = 159.71 cfs Storm frequency = 100 yrs Time to peak = 750 min Time interval = 6 min Hyd. volume = 1,215,255 cuft Drainage area = 129.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 46.90 min Total precip. = 7.82 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(129.000 x 55)] / 129.000 59 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 120.00 120.00 140.00 140.00 160.00 160.00 Q (cfs) Time (min) Existing Watershed #1 Hyd. No. 1 -- 100 Year Hyd No. 1 Precipitation Report 60 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 1 Existing Watershed #1 Storm Frequency = 100 yrs Time interval = 6 min Total precip. = 7.8200 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 1 : Existing Watershed #1 - 100 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 2 Existing watershed #2 Hydrograph type = SCS Runoff Peak discharge = 241.25 cfs Storm frequency = 100 yrs Time to peak = 774 min Time interval = 6 min Hyd. volume = 2,444,370 cuft Drainage area = 257.000 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 76.40 min Total precip. = 7.82 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 61 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 40.00 40.00 80.00 80.00 120.00 120.00 160.00 160.00 200.00 200.00 240.00 240.00 280.00 280.00 Q (cfs) Time (min) Existing watershed #2 Hyd. No. 2 -- 100 Year Hyd No. 2 Precipitation Report 62 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 2 Existing watershed #2 Storm Frequency = 100 yrs Time interval = 6 min Total precip. = 7.8200 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 2 : Existing watershed #2 - 100 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 3 Proposed Watershed #1 Hydrograph type = SCS Runoff Peak discharge = 159.71 cfs Storm frequency = 100 yrs Time to peak = 750 min Time interval = 6 min Hyd. volume = 1,215,255 cuft Drainage area = 129.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 46.90 min Total precip. = 7.82 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(1.000 x 98) + (3.400 x 61) + (124.600 x 55)] / 129.000 63 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 120.00 120.00 140.00 140.00 160.00 160.00 Q (cfs) Time (min) Proposed Watershed #1 Hyd. No. 3 -- 100 Year Hyd No. 3 Precipitation Report 64 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 3 Proposed Watershed #1 Storm Frequency = 100 yrs Time interval = 6 min Total precip. = 7.8200 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 3 : Proposed Watershed #1 - 100 Year Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 4 Proposed Watershed #2 Hydrograph type = SCS Runoff Peak discharge = 241.25 cfs Storm frequency = 100 yrs Time to peak = 774 min Time interval = 6 min Hyd. volume = 2,444,370 cuft Drainage area = 257.000 ac Curve number = 55* Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 76.40 min Total precip. = 7.82 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cdsShape factor = 484 * Composite (Area/CN) = [(0.850 x 61) + (1.000 x 98) + (255.150 x 55)] / 257.000 65 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 40.00 40.00 80.00 80.00 120.00 120.00 160.00 160.00 200.00 200.00 240.00 240.00 280.00 280.00 Q (cfs) Time (min) Proposed Watershed #2 Hyd. No. 4 -- 100 Year Hyd No. 4 Precipitation Report 66 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Hyd. No. 4 Proposed Watershed #2 Storm Frequency = 100 yrs Time interval = 6 min Total precip. = 7.8200 in Distribution = Custom Storm duration = M:\NOAA Type D Distribution.cds 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Precip (in) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Precip (in) Time (min)Custom Design Storm -- M:\NOAA Type D Distribution.cds Incremental Rainfall Precipitation Hyd. No. 4 : Proposed Watershed #2 - 100 Year Hydraflow Rainfall Report 67 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period (Yrs)B D E (N/A) 1 18.1733 3.5000 0.7010 -------- 2 22.7904 3.9000 0.7142 -------- 3 0.0000 0.0000 0.0000 -------- 5 26.8118 3.1000 0.7005 -------- 10 32.8535 3.8000 0.7098 -------- 25 38.4672 3.6000 0.7049 -------- 50 43.8334 3.7000 0.7074 -------- 100 48.6510 3.7000 0.7060 -------- File name: Brooklyn 2024.IDF Intensity = B / (Tc + D)^E Return Intensity Values (in/hr) Period(Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60 1 4.05 2.93 2.35 1.99 1.74 1.55 1.41 1.29 1.20 1.12 1.05 0.99 2 4.78 3.48 2.79 2.36 2.06 1.84 1.67 1.53 1.42 1.32 1.24 1.17 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 6.19 4.42 3.53 2.97 2.59 2.31 2.09 1.92 1.78 1.66 1.56 1.47 10 7.02 5.10 4.09 3.46 3.02 2.70 2.45 2.25 2.08 1.94 1.82 1.72 25 8.44 6.11 4.90 4.14 3.62 3.23 2.93 2.69 2.49 2.32 2.18 2.06 50 9.49 6.88 5.52 4.67 4.08 3.64 3.30 3.03 2.81 2.62 2.46 2.32 100 10.56 7.67 6.15 5.21 4.55 4.06 3.68 3.38 3.13 2.92 2.74 2.59 Tc = time in minutes. Values may exceed 60. Rainfall Precipitation Table (in) Precip. file name: M:\7000\7300\7386 Reynolds St. Improvements\Studies-Calculations\Danielson storms.pcp Storm Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 2.89 3.45 0.00 4.37 4.15 6.19 6.98 7.82 SCS 6-Hr 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Custom 2.89 3.45 0.00 4.37 5.14 6.19 6.98 7.82 Hydraflow Table of Contents 7885 Hydrographs.gpw Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Tuesday, 04 / 8 / 2025 1 - Year Summary Report......................................................................................................................... 1 Hydrograph Reports................................................................................................................... 2 Hydrograph No. 1, SCS Runoff, Existing Watershed #1.......................................................... 2 TR-55 Tc Worksheet............................................................................................................ 3 Precipitation Report............................................................................................................. 4 Hydrograph No. 2, SCS Runoff, Existing watershed #2........................................................... 5 TR-55 Tc Worksheet............................................................................................................ 6 Precipitation Report............................................................................................................. 7 Hydrograph No. 3, SCS Runoff, Proposed Watershed #1....................................................... 8 Precipitation Report............................................................................................................. 9 Hydrograph No. 4, SCS Runoff, Proposed Watershed #2....................................................10 TR-55 Tc Worksheet..........................................................................................................11 Precipitation Report...........................................................................................................12 2 - Year Summary Report.......................................................................................................................13 Hydrograph Reports.................................................................................................................14 Hydrograph No. 1, SCS Runoff, Existing Watershed #1........................................................14 Precipitation Report...........................................................................................................15 Hydrograph No. 2, SCS Runoff, Existing watershed #2.........................................................16 Precipitation Report...........................................................................................................17 Hydrograph No. 3, SCS Runoff, Proposed Watershed #1.....................................................18 Precipitation Report...........................................................................................................19 Hydrograph No. 4, SCS Runoff, Proposed Watershed #2....................................................20 Precipitation Report...........................................................................................................21 5 - Year Summary Report.......................................................................................................................22 Hydrograph Reports.................................................................................................................23 Hydrograph No. 1, SCS Runoff, Existing Watershed #1........................................................23 Precipitation Report...........................................................................................................24 Hydrograph No. 2, SCS Runoff, Existing watershed #2.........................................................25 Precipitation Report...........................................................................................................26 Hydrograph No. 3, SCS Runoff, Proposed Watershed #1.....................................................27 Precipitation Report...........................................................................................................28 Hydrograph No. 4, SCS Runoff, Proposed Watershed #2....................................................29 Precipitation Report...........................................................................................................30 10 - Year Summary Report.......................................................................................................................31 Hydrograph Reports.................................................................................................................32 Hydrograph No. 1, SCS Runoff, Existing Watershed #1........................................................32 Precipitation Report...........................................................................................................33 Hydrograph No. 2, SCS Runoff, Existing watershed #2.........................................................34 Precipitation Report...........................................................................................................35 Hydrograph No. 3, SCS Runoff, Proposed Watershed #1.....................................................36 Precipitation Report...........................................................................................................37 Contents continued...7885 Hydrographs.gpw Hydrograph No. 4, SCS Runoff, Proposed Watershed #2....................................................38 Precipitation Report...........................................................................................................39 25 - Year Summary Report.......................................................................................................................40 Hydrograph Reports.................................................................................................................41 Hydrograph No. 1, SCS Runoff, Existing Watershed #1........................................................41 Precipitation Report...........................................................................................................42 Hydrograph No. 2, SCS Runoff, Existing watershed #2.........................................................43 Precipitation Report...........................................................................................................44 Hydrograph No. 3, SCS Runoff, Proposed Watershed #1.....................................................45 Precipitation Report...........................................................................................................46 Hydrograph No. 4, SCS Runoff, Proposed Watershed #2....................................................47 Precipitation Report...........................................................................................................48 50 - Year Summary Report.......................................................................................................................49 Hydrograph Reports.................................................................................................................50 Hydrograph No. 1, SCS Runoff, Existing Watershed #1........................................................50 Precipitation Report...........................................................................................................51 Hydrograph No. 2, SCS Runoff, Existing watershed #2.........................................................52 Precipitation Report...........................................................................................................53 Hydrograph No. 3, SCS Runoff, Proposed Watershed #1.....................................................54 Precipitation Report...........................................................................................................55 Hydrograph No. 4, SCS Runoff, Proposed Watershed #2....................................................56 Precipitation Report...........................................................................................................57 100 - Year Summary Report.......................................................................................................................58 Hydrograph Reports.................................................................................................................59 Hydrograph No. 1, SCS Runoff, Existing Watershed #1........................................................59 Precipitation Report...........................................................................................................60 Hydrograph No. 2, SCS Runoff, Existing watershed #2.........................................................61 Precipitation Report...........................................................................................................62 Hydrograph No. 3, SCS Runoff, Proposed Watershed #1.....................................................63 Precipitation Report...........................................................................................................64 Hydrograph No. 4, SCS Runoff, Proposed Watershed #2....................................................65 Precipitation Report...........................................................................................................66 IDF Report..................................................................................................................67