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Home My WebLink AboutWETLANDS PERMIT APPLICATION - DARLING RESIDENCE - 0 RIDGE HILL RD - MONTVILLE CT 05.16.22 - ISSUE-1\\planning\planningoffice$\APPS, Forms, Templates\APPs & Guidelines (Each) rev 11-16-2018\IWC APP rev 8-24-2020.doc Town of Montville Inland Wetlands Application Permit# ___________________Check #_________ APPLICANT INSTRUCTIONS: All applicants must complete this application form. The Commission will notify the applicant of any additional information that may be required and will schedule a Public Hearing if necessary. In addition to the information required, the applicant may submit other supporting facts or documents which may assist the Commission in its evaluation of this proposal.PLEASE SUBMIT FOURTEEN (14) COPIES OF THE APPLICATION AND FOURTEEN (14) COPIES OF ANY OTHER DOCUMENTS AT LEAST FIVE BUSINESS DAYS PRIOR TO THE MEETING. I. Applicant Information Name________________________________ Address__________________________________________ Tel #_________________________________Cell #____________________________________ Fax #__________________________Email___________________________________________ Attach a Written Consent to the proposed activity from the owner if applicant is not the owner II. Owner Information Name________________________________ Address__________________________________ Tel #_________________________________Cell #____________________________________ Fax #__________________________Email___________________________________________ III. Engineer Information Contact_____________________________________ Firm________________________________ Address___________________________________ Tel #_________________________________Cell #____________________________________ Fax #__________________________Email___________________________________________ IV. Attorney Information Contact_____________________________________ Firm________________________________ Address___________________________________ Tel #_________________________________Cell #____________________________________ Fax #__________________________Email___________________________________________ V. Property Information Address of Proposed Activity_______________________________________________________ Assessor’s Map and Lot Number_____________________________________________________ Land Records /Deed Volume: _________Page:___________ Acreage of Property______________ Zoning _______________ Provide a List of the Names and Mailing Addresses of Adjacent Property Owners (Attach Sheet) Inland Wetlands Application Page 1 of 3 Lawrence J. Darling Jr. 61 Mostowy Road; East Lyme, CT 06333 860-304-0556 860-304-0556 darlingcarpentry@gmail.com X X Lynne King 20429 Watkins Meadow Drive Germantown, MD 20876 Edward H. Wenke III, PE Edward H. Wenke III, PE PO Box 544 Mukwonago, WI 53149 860-460-1606 ewenke@comcast.net Owner's Agent Susan Mattern PLS DGT Associates Inc.148 Route 2; Preston, CT 06365 860-889-1999 860-303-2787 smattern@dgtassociates.com 0 Ridge Hill Road; Oakdale/Montville CT; Lat 41.427433 Long -72.1945295 M006/B015/L000 7.5+/- Acres WRP-160 646 488-490 240-372-8953 lynneking15@yahoo.com \\planning\planningoffice$\APPS, Forms, Templates\APPs & Guidelines (Each) rev 11-16-2018\IWC APP rev 8-24-2020.doc VI. Wetlands and Watercourse Information Total Acreage of Wetlands on the site____________________ acres Wetland Disturbance Area_____________________________ sq ft Upland Review Disturbance Area ________________________sq ft Name of Soil Scientist____________________________________ Linear Feet of Watercourse Disturbance_____________________ ft Creation of New Wetlands________________________________ sq ft VII. Project Description Activity will involve (Check all that apply) See attached checklist of items that are to be included on Plan and supplemental data. A) Attach a Detailed Plan of the Proposal and indicate Plan Title and Date. _____________________________________________________________________________________ _____________________________________________________________________________________ ________ B) Provide Brief Description of the Proposed Project on separate piece of paper. Instructions attached. C) List Titles and dates of all documentation which will be included and submitted with this application and attach to application. Documents should include, but are not limited to; Project Proposal, Soil Scientist Reports, and Drainage Calculations. VIII. Other Information 1. Does the application involve an activity in a regulated area that is within 500 ft of another municipality? - If YES, then a copy of the application and all material is to be submitted to said Town and a copy of the transmittal form is to be provided to the Commission. 2. Is the property located within a Flood Hazard Area? -If YES, then please provide additional material showing the location of the area. 3. - If YES, then a copy of the application and all material is to be submitted to the State Department of Health as well as the appropriate Water Company. See attached instructions for the Notification Process for the State Health Department. A copy of the transmittal forms shall be provided to the Commission. Inland Wetlands Application Page 2 of 3 8313+/- SF; 0.19+/- Ac X 2022 R. Richard Snarski - 0 - X X X X X - 0 - 2,740 sf (0.063 Acres) 9,300 sf (0.21 Acres) X 150 CY Crossing 200 CY - U.R.A. Driveway - 0 - "Improvement Location Survey Showing Subsurface Sewage Disposal System & Proposed Wetlands Driveway Crossing" Date: May 2022; Scale: 1"=30'; Job # C1089; Sheets 1 thru 3 of 3 SEE ATTACHED ADDENDUM \\planning\planningoffice$\APPS, Forms, Templates\APPs & Guidelines (Each) rev 11-16-2018\IWC APP rev 8-24-2020.doc 4. Does the application require approval from Uncas Health District? - If YES, then a copy of the approval is to be provided to the Commission. 5. Does the application require approval from the Public Works Dept? - If YES, then a copy of the approval is to be provided to the Commission. 6. Does the application require approval from the Town of Montville WPCA? - If YES, then a copy of the approval is to be provided to the Commission. 7. Does the application require permits from the following agencies? Submission Info Army Corps of Engineers Date ___________ Department of Environmental Protection Department of Transportation - If YES, then a copy of the application and all material is to be submitted to said Agency and a copy of the transmittal form is to be provided to the Commission. 8. Does this permit require a State Water Diversion Permit? 9. Does this permit require a State Dam Permit? 10. Is this property subject to a Conservation Restriction and/or a Preservation Restriction? -If YES, attach a copy of certified notice. 11. If the application is a renewal or modification of an existing permit, is a copy of the original approval included in the documentation package? ______________________________________________________________________________ The undersigned applicant hereby consents to necessary and proper inspections of the above mentioned property by agents of the Montville Inland Wetlands Commission at reasonable times, both before and after the permit in question has been granted by the Commission. Name_______________________________________ Date______________________ Property Owner if other than Applicant________________________________ Date____________ Inland Wetlands Application Page 3 of 3 X X X X X X X X X X For Lynne King 05/12/22 05/12/22 For Lawrence J. Darling Jr. Edward H. Wenke III, PE CIVIL - STRUCTURAL – ENGINEER Licensed in: CT – RI – MA – ME – NY – PA – MD – WI - CA P.O. Box 544 – Mukwonago, WI 53149 Tel. 860.460.1606 Email: ewenke@comcast.net ADDENDUM TO INLAND WETLANDS APPLICATION Applicant: Lawrence J. Darling Jr. Property Address: 0 Ridge Hill Road; Oakdale; Town of Montville, CT Existing Site Description: This parcel gross area contains approximately 7.5+/- Acres. It is currently an undeveloped vacant wooded lot. The parcel is zoned WRP-160. The proposed use of this parcel will be Single-Family Residential. A new 3-BR house with on-site septic system and private on-site well is proposed. The new house will be located on the east side of the site along the road frontage on Ridge Hill Road. There is a regulated freshwater wetland area (8,313 sf 0.19 Ac) ~ (2.5% of gross parcel area). This wetland body drains a 3.5 Acres sub-watershed from north to south. It effectively bisects the parcel into an east & west section. The East section contains approximately 47,722 sf (14.6% of gross parcel area) of unregulated area outside of the URA. The West section contains approximately 251,607 sf (77.1% of gross parcel area). The East 50’ Upland Review Area (URA) contains approximately 10,330 sf (3.2% of gross parcel area). The West 50’ Upland Review Area (URA) contains approximately 8,575 sf (2.6% of gross parcel area). Proposed Project Description: The applicant is proposing to construct a 12’ wide gravel driveway running from the new house on the east side and extending to the west side of the wetland area. The purpose of this driveway will be to attain reasonable access and use of the western portion of the site, which comprises the majority (77.1%) of the overall parcel area. The applicant proposes to construct an outbuilding/basin/shop on the western portion of this parcel. The outbuilding will not be served by water or septic system services. The wetland crossing for the proposed gravel driveway requires approval of the following: - 2,740 SF (0.06 Ac) of tree clearing, permanent fill with 12’W gravel driveway & 18” diameter culvert within the Regulated Wetland Limits. - Estimated Fill Volume within Regulated Wetland Limits = 150 +/- CY. - 6,100 SF (0.16 Ac) of tree clearing, permanent fill with 12’W gravel driveway within the Eastern 50’ URA Limits. - Estimated Fill Volume within Eastern 50’ URA Limits = 100 +/- CY. Edward H.Wenke III,PE –Civil Structural Engineer Tel.860.460.1606 Email:ewenke@comcast.com Licensed in:Connecticut,Rhode Island,Massachusetts,Maine,New York,Pennsylvania,Maryland,Wisconsin &California 2 - 3,200 sf (0.07 Ac) of tree clearing, permanent fill with 12’W gravel driveway within the Western 50’ URA Limits. - Estimated Fill Volume within Western 50’ URA Limits = 100 +/- CY. Summary of Regulated Wetland Activities: Gross Fill/Disturbance in Regulated Wetlands = 2,740 SF with 150 +/- CY Gross Fill/Disturbance in Regulated 50’ URA = 9,300 SF with 200 +/- CY Alternatives Considered: The only way to access the western 5.8 Acre portion of this site for ANY reasonable use will require a crossing of the existing wetland area. There are no other alternatives for reasonable access to the remaining 77% of the overall parcel. The location of the crossing was selected because it is the narrowest portion, and it allows for a new culvert installation. The culvert will be an 18” dia HDPE pipe culvert with flared inlet & outlet ends. Each end will be lined with 10’x10’ modified rip rap stone. Flow velocities have minimum scour effect. The side slopes of the crossing embankment will be graded at 3:1 slopes & stabilized with ryegrass. The culvert size is capable of flowing up to a 100-year storm event (with a headwater build-up at the inlet). However, the hydraulic capacity of the culvert will pass all storms up to and including a 50-year event with excessive headwater build-up. Drainage hydraulic calculations are included with this application. I trust that this analysis adequately addresses your needs. Please call me at this office if you require any additional information or clarifications. Thank you for your time and consideration. Respectfully, Edward H. Wenke III, PE Civil Structural Engineer CT PE #16771 (exp. 01/31/23) rev. 1/20 - Statewide Inland Wetlands & Watercourses Activity Reporting Form PART I: Must Be Completed By The Inland Wetlands Agency 1.DATE ACTION WAS TAKEN: 2.ACTION TAKEN : 3.WAS A PUBLIC HEARING HELD (check one)?es o 4.NAME OF AGENCY OFFICIAL VERIFYING AND COMPLETING THIS FORM: (name) (signature) ________________________________________________ PART II: To Be Completed By The Inland Wetlands Agency Or The Applicant TOWN IN WHICH THE IS OCCURRING ( name): oes this project cross municipal boundaries (check one)?es o f es, list the other town(s) in which the is occurring ( name(s)): 7. 8. ACTIVITY PURPOSE CODE : ACTIVITY TYPE CODE(S): WETLAND / WATERCOURSE AREA ALTERED (acres or linear feet) 12.UPLAND AREA ALTERED (): 13.AREA OF WETLANDS / WATERCOURSES RESTORED, ENHANCED OR CREATED (): DATE RECEIVED:PART III: To Be Completed By The DEEP DATE RETURNED TO DEEP: FORM COMPLETED: YES NO FORM CORRECTED / COMPLETED: YES NO GIS CODE #: ____ ____ ____ ____ ____ ____ ____ ____ ____ For DEEP Use Only NAME OF APPLICANT, VIOLATOR OR PETITIONER ( name): NAME & ADDRESS OF PROJECT SITE (information): riefly describe the action/project/activity (check and information):emporary ermanent escription: MONTVILLE x 2203 Lawrence J. Darling Jr. 0 Ridge Hill Road; Oakdale/Montville CT X Wetland crossing & U.R.A. disturbance for Driveway 0.06 0.21 - 0 - B 9 MONTVILLE CONN. ADJOININGPROPERTYOWNERSAsOf05/16/2022Project:DARLINGRESIDENCEAddress:0RidgeHillRoad;Montville,CTNo. OwnerNameParcelAddressMailingAddress1RobertAHarris&NadineD.Harris124RidgeHillRoad;Montville,CT124RidgeHillRoad;Oakdale,CT063702HillaryHollingsworth&ShawnGinter 136RidgeHillRoad;Montville,CT136RidgeHillRoad;Oakdale,CT063703AdamMcNiece178RidgeHillRoad;Montville,CT5PalmDrive;Yankeetown,FL344984CityofNewLondonWaterDepartmentChesterfieldRoad;Montville,CT15MasonicStreet;NewLondon,CT063205TheConnecticutAudubonSocietyInc RidgeHillRoad;Oakdale/Montville2325BurrStreet;Fairfield,CT06824 H:\APPLICATION FORMS\APPs & Guidelines (Each) rev 11-16-2018\IWC APP Checklist Rev 11-15-2018.doc 1 TOWN OF MONTVILLE INLAND WETLANDS APPLICATION CHECKLIST N/A Completed application signed by the property owner. If you are acting on behalf of the property owner than a letter must also be submitted by the property owner stating that you are acting as his/her agent. Application must have the disturbance area in square feet and acres to include the buffer area, as well as, the wetland area and what type of activity it will be in tabular format. A narrative describing the activities to take place on the property. This is to include but not limited to: Alternatives considered. Description of the activity including location and square footage of Disturbance. What type of erosion and sediment control will be used. If machinery will be used or if work will be done by hand. Identify the sub-drainage basin where the proposed activity will occur. List of abutting property owners and names indicated on plan. Location of all wells and septic systems of abutting property owners, as well as, any located onsite. Existing and proposed contours at 5 ft contours. Location of all designated wetland and watercourse areas by a Certified Soil Scientist. A soils report from the soil scientist shall also be provided along with a live signature and stamp on the plans. Location of all Flood Zones per Federal Flood Insurance Rate Maps. Location of all existing and proposed buildings and their uses. Location of all crossings and storm water drainage systems and their drainage. calculations based on ten (10) and Twenty-five (25) year storms. In addition all points of ground water discharge will also be shown. Location of all Erosion and Sediment control devices and an Erosion and Sediment control plan. North arrow and location key at 1"= 1000". DEEP Report Form. Inland Wetlands Checklist Page 1 of 2 X X X X X X X X X X X X X H:\APPLICATION FORMS\APPs & Guidelines (Each) rev 11-16-2018\IWC APP Checklist Rev 11-15-2018.doc 2 The requirements of Section 7.5 shall apply if the proposed activity has been determined significant. Site plans for the proposed use or operation and the property which will be affected, which show existing and proposed conditions, wetland and watercourse boundaries, land contours, boundaries of land ownership, proposed alterations and use of wetlands and watercourses, and other pertinent features of the development drawn by a licensed surveyor, professional engineer or landscape architect registered in the State of Connecticut or by such other qualified person; Engineering reports and analyses and additional drawing to fully describe the proposed project and any filling, excavation, drainage or hydraulic modifications to watercourses and the proposed erosion and sedimentation control plan; Mapping of soil types consistent with the categories established by the National Cooperative Soil Survey of the U. S. Soil Conservation Service (the Commission may require the applicant to have the wetlands delineated in the field by a soil scientist and that the field delineation be incorporated onto the site plan); Description of how the ecological communities and functions of the wetlands or watercourses involved with the application and the effects of the proposed regulated activities on these communities and wetlands functions; Description of how the applicant will change, diminish, or enhance the ecological communities and functions of the wetlands or watercourses involved in the application, and with each alternative, and a description of why each alternative considered was deemed neither feasible nor prudent; Analysis of chemical or physical characteristics of any fill material; Measures which mitigate the impact of the proposed activity. Such measures include, but are not limited to, plans or actions which avoid destruction or diminution of wetland or watercourse functions, recreational uses and natural habitats, which prevent flooding or degradation of water quality. In addition to this checklist, the applicant is also responsible for those items listed in the EROSION & SEDIMENT CONTROL CHECKLIST Inland Wetlands Checklist Page 2 of 2 Edward H Wenke III PE Civil/Structural Engineer T 860.460.1606 ewenke@comcast.net Rational Method Hydrologic Analysis Watershed Conditions & Run-off Analysis Rev-A DARLING CULVERT FLOW ANALYSIS 15-May-22 Darling Residence - 0 Rocky Hill Road - Montville CT Rational Method EHW, PE HISTORIC CONDITIONS - Design Point #1 - TO CULVERT INLET Watershed Characteristics: Surface Description Area (Acres)Coeff. "C"AxC HSG Wooded Area - 5%-12% Slope; Forest Litter 3.250 0.40 1.30 B Totals:3.250 Total AxC = 1.30 Gross Watershed Area (Aw ) - Sq. Miles =0.0051 < 0.1 Sq. Mile - Therefore Use NRSC Method* for Tc Analysis NRSC Method for Time of Concentration: Tt - Overland Sheet Flow (100 LF Max Allowed):T t = (0.007 x (L x nol )0.80) / ((P 2)0.50 x (S)0.4) Tt - Shallow Concentrated Flow :T t = (L) / (3600 x K x (S)0.5 ) Tt - Defined Open Channel Flow:T t = (L) / ((3600 x (1.49/n) x ( R)0.666 x (S)0.5 )) 2-year / 24 hour Rainfall Depth (P2):3.43 inches (New London County - CTDOT Manual) K Factor (Shallow Conc Flow):16.13 Unpaved Surface 20.32 Paved Surface Open Channel X-Sectional Area Flow (Ac)71.00 SF Open Channel Wetted Perimeter (WP):110.00 LF Channel Hydraulic Radius = R = Ac/WP =0.65 Time Of Concentration:Tt* Reach Description:Length - "L" (ft)Mannings "n"S = % Slope Velocity (fps)(Minutes) Overland Flow -Flat Lawn 100 0.400 0.025 0.09 18.97 Shallow Concentrated 550 0.025 3.59 Channelized Flow 100 0.070 0.010 1.59 1.05 Totals:750 LF T c (min.) =22.56 Rainfall Intensities:NOAA Atlas #14 Run-off Rate Storm Event Intensity (In/Hr)To Inlet MINIMUM Historic Tc (Minutes) Used ~22.6 "Q" (CFS)Run-off Coefficient Adjustment Factors: 2 year 2.30 2.99 < 10 years 1.00 10 year 2.91 3.78 25 Years 1.10 25 year 4.12 5.89 50 Years 1.20 50 year 4.65 7.25 100 Years 1.25 100 year 5.21 8.47 Page 1 of 1 5/16/2022 5/16/22, 5:14 AM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=41.4261&lon=-72.1936&data=intensity&units=english&series=pds 1/4 NOAA Atlas 14, Volume 10, Version 3 Location name: Oakdale, Connecticut, USA* Latitude: 41.4261°, Longitude: -72.1936° Elevation: 389.64 ft** * source: ESRI Maps** source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES Sanja Perica, Sandra Pavlovic, Michael St. Laurent, Carl Trypaluk, Dale Unruh, Orlan Wilhite NOAA, National Weather Service, Silver Spring, Maryland PF_tabular |PF_graphical |Maps_&_aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches/hour) 1 Duration Average recurrence interval (years) 1 2 5 10 25 50 100 200 500 1000 5-min 4.06 (3.165.06) 4.86 (3.786.06) 6.17 (4.797.72) 7.24 (5.589.11) 8.72 (6.5211.4) 9.84 (7.2113.1) 11.0 (7.8415.1) 12.4 (8.3217.2) 14.3 (9.2520.6) 15.9 (10.123.3) 10-min 2.87 (2.243.58) 3.44 (2.684.29) 4.36 (3.385.46) 5.12 (3.956.45) 6.18 (4.618.07) 6.97 (5.109.27) 7.80 (5.5610.7) 8.75 (5.8912.2) 10.1 (6.5614.6) 11.3 (7.1316.5) 15-min 2.26 (1.762.81) 2.70 (2.103.36) 3.42 (2.654.28) 4.02 (3.105.05) 4.84 (3.626.33) 5.46 (4.007.27) 6.12 (4.368.42) 6.86 (4.629.58) 7.94 (5.1511.4) 8.84 (5.5912.9) 30-min 1.59 (1.241.98) 1.90 (1.482.37) 2.41 (1.873.01) 2.83 (2.183.56) 3.41 (2.554.45) 3.84 (2.815.11) 4.30 (3.065.91) 4.83 (3.256.74) 5.58 (3.618.02) 6.20 (3.929.07) 60-min 1.02 (0.7971.27) 1.22 (0.9521.53) 1.55 (1.201.94) 1.82 (1.412.29) 2.20 (1.642.87) 2.48 (1.813.30) 2.77 (1.973.81) 3.11 (2.094.34) 3.59 (2.335.17) 3.99 (2.525.84) 2-hr 0.673 (0.5280.834) 0.803 (0.6300.996) 1.02 (0.7941.26) 1.19 (0.9261.49) 1.44 (1.081.86) 1.62 (1.192.14) 1.81 (1.302.48) 2.04 (1.382.82) 2.37 (1.543.37) 2.64 (1.683.83) 3-hr 0.521 (0.4110.643) 0.621 (0.4890.767) 0.785 (0.6160.971) 0.920 (0.7181.15) 1.11 (0.8371.43) 1.25 (0.9231.64) 1.40 (1.011.90) 1.57 (1.072.16) 1.83 (1.192.59) 2.05 (1.302.94) 6-hr 0.332 (0.2640.407) 0.395 (0.3140.485) 0.498 (0.3940.612) 0.583 (0.4580.720) 0.700 (0.5330.898) 0.788 (0.5881.03) 0.881 (0.6391.19) 0.990 (0.6751.35) 1.15 (0.7551.62) 1.29 (0.8241.84) 12-hr 0.205 (0.1640.249) 0.243 (0.1940.296) 0.306 (0.2440.373) 0.358 (0.2830.439) 0.429 (0.3290.546) 0.483 (0.3620.625) 0.539 (0.3930.721) 0.605 (0.4150.818) 0.702 (0.4620.975) 0.783 (0.5031.11) 24-hr 0.120 (0.0970.146) 0.144 (0.1160.174) 0.182 (0.1460.221) 0.214 (0.1710.260) 0.258 (0.1990.325) 0.290 (0.2190.373) 0.325 (0.2380.431) 0.365 (0.2520.489) 0.426 (0.2810.585) 0.476 (0.3070.664) 2-day 0.067 (0.0550.081) 0.081 (0.0660.098) 0.104 (0.0840.126) 0.123 (0.0990.149) 0.149 (0.1160.187) 0.169 (0.1290.216) 0.189 (0.1400.250) 0.215 (0.1480.284) 0.252 (0.1670.343) 0.285 (0.1840.393) 3-day 0.049 (0.0400.058) 0.059 (0.0480.070) 0.075 (0.0610.090) 0.089 (0.0720.107) 0.108 (0.0840.135) 0.122 (0.0930.155) 0.137 (0.1020.180) 0.155 (0.1080.205) 0.183 (0.1220.247) 0.206 (0.1340.283) 4-day 0.039 (0.0320.047) 0.047 (0.0390.056) 0.060 (0.0490.072) 0.071 (0.0580.085) 0.086 (0.0670.107) 0.097 (0.0740.123) 0.109 (0.0810.142) 0.123 (0.0860.162) 0.145 (0.0960.195) 0.163 (0.1060.223) 7-day 0.027 (0.0220.032) 0.032 (0.0260.038) 0.040 (0.0330.047) 0.047 (0.0380.056) 0.056 (0.0440.069) 0.063 (0.0480.079) 0.070 (0.0520.091) 0.079 (0.0550.103) 0.092 (0.0620.123) 0.103 (0.0670.140) 10-day 0.022 (0.0180.026) 0.025 (0.0210.030) 0.031 (0.0260.037) 0.036 (0.0300.043) 0.043 (0.0340.053) 0.048 (0.0370.060) 0.054 (0.0400.069) 0.060 (0.0420.077) 0.069 (0.0460.092) 0.077 (0.0500.103) 20-day 0.015 (0.0130.018) 0.017 (0.0150.020) 0.021 (0.0170.024) 0.023 (0.0190.027) 0.027 (0.0210.033) 0.030 (0.0230.036) 0.032 (0.0240.041) 0.035 (0.0250.045) 0.040 (0.0270.052) 0.043 (0.0280.057) 30-day 0.013 (0.0110.015) 0.014 (0.0120.017) 0.016 (0.0140.019) 0.018 (0.0150.021) 0.021 (0.0170.025) 0.023 (0.0180.028) 0.025 (0.0180.031) 0.026 (0.0190.034) 0.029 (0.0200.038) 0.031 (0.0200.041) 45-day 0.011 (0.0090.012) 0.012 (0.0100.014) 0.013 (0.0110.015) 0.014 (0.0120.017) 0.016 (0.0130.019) 0.018 (0.0140.021) 0.019 (0.0140.023) 0.020 (0.0140.025) 0.022 (0.0150.028) 0.023 (0.0150.030) 60-day 0.009 (0.0080.011) 0.010 (0.0090.012) 0.011 (0.0100.013) 0.012 (0.0100.014) 0.014 (0.0110.016) 0.015 (0.0120.018) 0.016 (0.0120.019) 0.017 (0.0120.021) 0.018 (0.0120.023) 0.018 (0.0120.024) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are notchecked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. Back to Top PF graphical RAINFALL INTENSITIES 5/16/22, 5:14 AM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=41.4261&lon=-72.1936&data=intensity&units=english&series=pds 2/4 Back to Top Maps & aerials Small scale terrain Culvert Report Project filename: DARLING - CULVERT - 05.15.22.cst Culvert Studio v 2.0.0.26 05-16-2022 DARLING Culvert 1 CULVERT Shape = Circular Inlet Edge = Projecting Material = HDPE Manning's n = 0.012 Rise = 18 in Span = 18 in Invert Elev. Down = 370.00 ft Length = 40.0 ft Slope = 0.075 ft/ft Invert Elev. Up = 373.00 ft No. Barrels = 1 Plan Skew Angle = 0 degrees EMBANKMENT Top Width = 18.00 ft Top Elevation = 375.50 ft Crest Length = 60.00 ft DISCHARGE Method = Qmin to Qmax Q Min = 3.00 cfs Q Max = 8.50 cfs Q Increment = 1.00 cfs TAILWATER Tailwater Elevation = Normal Depth CALCULATION SAMPLE Discharge Velocity Depth HGL @ Hw/D = 0.58 TotalCulvertOver TopDownUpDownUpDownUp Hw (cfs) (cfs) (cfs) (ft/s) (ft/s) (in) (in) (ft) (ft) (ft) 3.00 3.00 0.00 10.73 3.98 3.9 8.0 370.32 373.66 373.87 Culvert Report Project filename: DARLING - CULVERT - 05.15.22.cst Culvert Studio v 2.0.0.26 05-16-2022 DARLING Culvert 1 CULVERT Shape = Circular Inlet Edge = Projecting Material = HDPE Manning's n = 0.012 Rise = 18 in Span = 18 in Invert Elev. Down = 370.00 ft Length = 40.0 ft Slope = 0.075 ft/ft Invert Elev. Up = 373.00 ft No. Barrels = 1 Plan Skew Angle = 0 degrees EMBANKMENT Top Width = 18.00 ft Top Elevation = 375.50 ft Crest Length = 60.00 ft DISCHARGE Method = Qmin to Qmax Q Min = 3.00 cfs Q Max = 8.50 cfs Q Increment = 1.00 cfs TAILWATER Tailwater Elevation = Normal Depth CALCULATION SAMPLE Discharge Velocity Depth HGL @ Hw/D = 0.58 TotalCulvertOver TopDownUpDownUpDownUp Hw (cfs) (cfs) (cfs) (ft/s) (ft/s) (in) (in) (ft) (ft) (ft) 3.00 3.00 0.00 10.73 3.98 3.9 8.0 370.32 373.66 373.87 Culvert Report Project filename: DARLING - CULVERT - 05.15.22.cst Culvert Studio v 2.0.0.26 05-16-2022 DARLING Culvert 1 CULVERT Shape = Circular Inlet Edge = Projecting Material = HDPE Manning's n = 0.012 Rise = 18 in Span = 18 in Invert Elev. Down = 370.00 ft Length = 40.0 ft Slope = 0.075 ft/ft Invert Elev. Up = 373.00 ft No. Barrels = 1 Plan Skew Angle = 0 degrees EMBANKMENT Top Width = 18.00 ft Top Elevation = 375.50 ft Crest Length = 60.00 ft DISCHARGE Method = Qmin to Qmax Q Min = 3.00 cfs Q Max = 8.50 cfs Q Increment = 1.00 cfs TAILWATER Tailwater Elevation = Normal Depth CALCULATION SAMPLE Discharge Velocity Depth HGL @ Hw/D = 0.58 TotalCulvertOver TopDownUpDownUpDownUp Hw (cfs) (cfs) (cfs) (ft/s) (ft/s) (in) (in) (ft) (ft) (ft) 3.00 3.00 0.00 10.73 3.98 3.9 8.0 370.32 373.66 373.87 Culvert Report Project filename: DARLING - CULVERT - 05.15.22.cst Culvert Studio v 2.0.0.26 05-16-2022 DARLING Culvert 1 CULVERT Shape = Circular Inlet Edge = Projecting Material = HDPE Manning's n = 0.012 Rise = 18 in Span = 18 in Invert Elev. Down = 370.00 ft Length = 40.0 ft Slope = 0.075 ft/ft Invert Elev. Up = 373.00 ft No. Barrels = 1 Plan Skew Angle = 0 degrees EMBANKMENT Top Width = 18.00 ft Top Elevation = 375.50 ft Crest Length = 60.00 ft DISCHARGE Method = Qmin to Qmax Q Min = 3.00 cfs Q Max = 8.50 cfs Q Increment = 1.00 cfs TAILWATER Tailwater Elevation = Normal Depth CALCULATION SAMPLE Discharge Velocity Scour Geometry Total Culvert Over Top Down Up Depth Width Length Volume Location (cfs) (cfs) (cfs) (ft/s) (ft/s) (ft) (ft) (ft) (cft) (ft) 3.00 3.00 0.00 10.73 3.98 0.00 0.00 0.00 0.00 0.00 Culvert Report Project filename: DARLING - CULVERT - 05.15.22.cst Culvert Studio v 2.0.0.26 05-16-2022 DARLING Culvert 1 CULVERT Shape = Circular Inlet Edge = Projecting Material = HDPE Manning's n = 0.012 Rise = 18 in Span = 18 in Invert Elev. Down = 370.00 ft Length = 40.0 ft Slope = 0.075 ft/ft Invert Elev. Up = 373.00 ft No. Barrels = 1 Plan Skew Angle = 0 degrees EMBANKMENT Top Width = 18.00 ft Top Elevation = 375.50 ft Crest Length = 60.00 ft DISCHARGE Method = Qmin to Qmax Q Min = 3.00 cfs Q Max = 8.50 cfs Q Increment = 1.00 cfs TAILWATER Tailwater Elevation = Normal Depth CALCULATION SAMPLE Discharge Velocity Riprap Apron Design Total Culvert Over Top Down Up Length Width Depth D50 Velocity (cfs) (cfs) (cfs) (ft/s) (ft/s) (ft) (ft) (ft) (in) (ft/s) 3.00 3.00 0.00 10.73 3.98 6.00 8.52 1.46 5 2.26