Loading...
HomeMy WebLinkAbout24SITE3 - Drainage Report 04-08-2024 Green Site Design, LLC DRAINAGE CALCULATIONS, HYDRAULICS & HYDROLOGY REPORT 1492 Hartford – New London Turnpike (CT Route 85) Montville, CT April 8th, 2024 H-1 DRAINAGE HYDRAULICS AND HYDROLOGY REPORT 1492 Hartford – New London Turnpike (CT Route 85) Montville, CT EXISTING CONDITIONS The site is approximately 5.62 acres in area and is shown on the Existing Conditions Survey (Sheet 1 of the site plans). The site has frontage on Hartford – New London Turnpike (Route 85). There are approximately 0.38 acres of wetlands on the site. PROPOSED DEVELOPMENT The project proposes the development of a processing, material storage, and equipment storage facility. There will be no free standing buildings on the site but there will be several storage bays and a construction trailer. The 5.62 acres site contains wetlands as shown on sheet 1. Of the 5.62 acres, 4.08 acres will be disturbed during the development process. There will be no disturbance within the wetlands or upland review area. EXISTING AND PROPOSED HYDRAULICS The stormwater management system has been designed to provide for zero increase in peak stormwater discharge from the site. The project has been designed to actually result in a decrease in the peak stormwater rates leaving the project site. The proposed stormwater water quality basin will provide treatment of the runoff from the proposed site. The current site is divided into two, existing, drainage areas: Existing Drainage Area 1 2.98 Acres Existing Drainage Area 2 2.64 Acres H-2 The development of the proposed site will result in two drainage areas: Proposed Drainage Area 1 4.08 Acres Proposed Drainage Area 2 1.54 Acres Proposed Drainage Area 1 contains the developed site. The stormwater runoff from this area will be treated by the water quality basin in the northwestern corner of the site. Proposed Drainage Area 2 contains the wetlands and upland review area and will remain undeveloped. Both the existing and the proposed conditions for the development site have been analyzed for the 2-year, 10-year, 25-year, 50-year, and 100 year design storms using the Rational Method. Drainage Area 1 2 Year 10 Year 25 Year 50 Year 100 Year Existing 2.21 cfs 3.32 cfs 4.00 cfs 4.50 cfs 5.04 cfs Proposed 0.00 cfs 0.00 cfs 0.00 cfs 0.00 cfs 0.00 cfs Drainage Area 2 2 Year 10 Year 25 Year 50 Year 100 Year Existing 1.96 cfs 2.94 cfs 3.54 cfs 3.99 cfs 4.46 cfs Proposed 0.70 cfs 1.05 cfs 1.27 cfs 1.43 cfs 1.60 cfs H-3 EROSION & SEDIMENTATION CONTROL The 2002 CT Guidelines for Soil Erosion & Sedimentation Control applies to the construction phase of the project. A detailed erosion and sediment control plan has been provided in the site development plans. The proposed stormwater water quality basin has been designed to function as sedimentation traps during stabilization. The first calculation required by the Guidelines is for the sediment storage volume (SSV). The sediment storage volume is the calculation for one year of predicted sediment load. The required SSV calculation for the temporary sediment trap is shown below. Drainage Area 1A SSV = A(134CY/Acre) A = 4.08 ACRE SSV = 546.72 CY = 14,760 CF The second calculation required by the Guidelines is for wet storage volume (WSV). The wet storage volume is the volume in the basin that is located below the bottom of the riprap for the level spreader outlet of the basin. The volume of the wet storage is required to be half of the required SSV. The required wet storage volume is shown below along with the dry storage volumes (DSV). Drainage Area 1A WSV = DSV = SSV/2 = 7,380 CF H-4 The required and provided storage for each basin are as follows: Drainage Area 1 (Bottom of Riprap Elev. = 206.5) Sedimentation Trap 7,380 CF of Wet Storage Volume Required 11,965 CF Provided 7,380 CF of Dry Storage Volume Required 10,260 CF Provided 14,760 CF of Sediment Storage Volume Required 22,225 CF Total Provided CONNECTICUT STORMWATER QUALITY MANUAL The Connecticut 2004 Stormwater Quality Manual (Manual) applies to the post construction phase, for the operation of the facility. The temporary sediment traps have been designed to function as water quality basins after the site is stabilized. They all meet the criteria of the Connecticut Stormwater Quality Manual for a Water Quality Basin. Drainage Area 1 WQV = (1")(R)(A)/12 A = 4.08 Acre R = 0.05 + 0.009(I) I = 0.05 Acres / 4.08 Acres = 0.012 (1.2%) R = 0.061 WQV = 0.021 Ac-Ft = 903.9 CF (Required) 11,965 CF (Provided) H-5 Once development of the site is completed, there will be a decrease in runoff from the site. The temporary sedimentation basin provides ample wet and dry storage volume to meet and exceed the requirements of the 2002 CT Guidelines for Soil & Sedimentation Control. Likewise, Water Quality Basin meets and exceeds the post construction requirements of the Connecticut 2004 Stormwater Quality Manual. 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 Rational 2.212 1 9 1,194 ------ ------ ------ Existing Area 1 2 Rational 3.028 1 9 1,635 ------ ------ ------ Proposed Area 1 3 Reservoir 0.000 1 n/a 0 2 204.43 1,635 Water Quality Basin 4 Rational 1.960 1 9 1,058 ------ ------ ------ Existing Area 2 5 Rational 0.702 1 22 926 ------ ------ ------ Proposed Area 2 GSD 69 - Drainage Calculations - V1.gpw Return Period: 2 Year Friday, Apr 5, 2024 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 1 Existing Area 1 Hydrograph type = Rational Peak discharge = 2.212 cfs Storm frequency = 2 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 1,194 cuft Drainage area = 2.980 ac Runoff coeff. = 0.2 Intensity = 3.711 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 2 0 2 4 6 8 10 12 14 16 18 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 Q (cfs) Time (min) Existing Area 1 Hyd. No. 1 -- 2 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 2 Proposed Area 1 Hydrograph type = Rational Peak discharge = 3.028 cfs Storm frequency = 2 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 1,635 cuft Drainage area = 4.080 ac Runoff coeff. = 0.2 Intensity = 3.711 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 3 0 2 4 6 8 10 12 14 16 18 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 Area 1 Hyd. No. 2 -- 2 Year Hyd No. 2 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 3 Water Quality Basin Hydrograph type = Reservoir Peak discharge = 0.000 cfs Storm frequency = 2 yrs Time to peak = n/a Time interval = 1 min Hyd. volume = 0 cuft Inflow hyd. No. = 2 - Proposed Area 1 Max. Elevation = 204.43 ft Reservoir name = Pond 1 Max. Storage = 1,635 cuft Storage Indication method used. 4 0 2 4 6 8 10 12 14 16 18 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) Water Quality Basin Hyd. No. 3 -- 2 Year Hyd No. 3 Hyd No. 2 Total storage used = 1,635 cuft Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 4 Existing Area 2 Hydrograph type = Rational Peak discharge = 1.960 cfs Storm frequency = 2 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 1,058 cuft Drainage area = 2.640 ac Runoff coeff. = 0.2 Intensity = 3.711 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 5 0 2 4 6 8 10 12 14 16 18 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 Q (cfs) Time (min) Existing Area 2 Hyd. No. 4 -- 2 Year Hyd No. 4 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 5 Proposed Area 2 Hydrograph type = Rational Peak discharge = 0.702 cfs Storm frequency = 2 yrs Time to peak = 22 min Time interval = 1 min Hyd. volume = 926 cuft Drainage area = 1.540 ac Runoff coeff. = 0.2 Intensity = 2.278 in/hr Tc by TR55 = 22.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 6 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 Q (cfs) 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 Q (cfs) Time (min) Proposed Area 2 Hyd. No. 5 -- 2 Year Hyd No. 5 Hydrograph Summary Report 7 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 Rational 2.807 1 9 1,516 ------ ------ ------ Existing Area 1 2 Rational 3.842 1 9 2,075 ------ ------ ------ Proposed Area 1 3 Reservoir 0.000 1 n/a 0 2 204.54 2,075 Water Quality Basin 4 Rational 2.486 1 9 1,343 ------ ------ ------ Existing Area 2 5 Rational 0.891 1 22 1,176 ------ ------ ------ Proposed Area 2 GSD 69 - Drainage Calculations - V1.gpw Return Period: 5 Year Friday, Apr 5, 2024 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 1 Existing Area 1 Hydrograph type = Rational Peak discharge = 2.807 cfs Storm frequency = 5 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 1,516 cuft Drainage area = 2.980 ac Runoff coeff. = 0.2 Intensity = 4.709 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 8 0 2 4 6 8 10 12 14 16 18 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 Q (cfs) Time (min) Existing Area 1 Hyd. No. 1 -- 5 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 2 Proposed Area 1 Hydrograph type = Rational Peak discharge = 3.842 cfs Storm frequency = 5 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 2,075 cuft Drainage area = 4.080 ac Runoff coeff. = 0.2 Intensity = 4.709 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 9 0 2 4 6 8 10 12 14 16 18 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 Area 1 Hyd. No. 2 -- 5 Year Hyd No. 2 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 3 Water Quality Basin Hydrograph type = Reservoir Peak discharge = 0.000 cfs Storm frequency = 5 yrs Time to peak = n/a Time interval = 1 min Hyd. volume = 0 cuft Inflow hyd. No. = 2 - Proposed Area 1 Max. Elevation = 204.54 ft Reservoir name = Pond 1 Max. Storage = 2,075 cuft Storage Indication method used. 10 0 2 4 6 8 10 12 14 16 18 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) Water Quality Basin Hyd. No. 3 -- 5 Year Hyd No. 3 Hyd No. 2 Total storage used = 2,075 cuft Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 4 Existing Area 2 Hydrograph type = Rational Peak discharge = 2.486 cfs Storm frequency = 5 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 1,343 cuft Drainage area = 2.640 ac Runoff coeff. = 0.2 Intensity = 4.709 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 11 0 2 4 6 8 10 12 14 16 18 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 Q (cfs) Time (min) Existing Area 2 Hyd. No. 4 -- 5 Year Hyd No. 4 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 5 Proposed Area 2 Hydrograph type = Rational Peak discharge = 0.891 cfs Storm frequency = 5 yrs Time to peak = 22 min Time interval = 1 min Hyd. volume = 1,176 cuft Drainage area = 1.540 ac Runoff coeff. = 0.2 Intensity = 2.892 in/hr Tc by TR55 = 22.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 12 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 Q (cfs) 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 Q (cfs) Time (min) Proposed Area 2 Hyd. No. 5 -- 5 Year Hyd No. 5 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 Rational 3.318 1 9 1,792 ------ ------ ------ Existing Area 1 2 Rational 4.543 1 9 2,453 ------ ------ ------ Proposed Area 1 3 Reservoir 0.000 1 n/a 0 2 204.63 2,453 Water Quality Basin 4 Rational 2.940 1 9 1,587 ------ ------ ------ Existing Area 2 5 Rational 1.052 1 22 1,388 ------ ------ ------ Proposed Area 2 GSD 69 - Drainage Calculations - V1.gpw Return Period: 10 Year Friday, Apr 5, 2024 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 1 Existing Area 1 Hydrograph type = Rational Peak discharge = 3.318 cfs Storm frequency = 10 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 1,792 cuft Drainage area = 2.980 ac Runoff coeff. = 0.2 Intensity = 5.567 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 14 0 2 4 6 8 10 12 14 16 18 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 Area 1 Hyd. No. 1 -- 10 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 2 Proposed Area 1 Hydrograph type = Rational Peak discharge = 4.543 cfs Storm frequency = 10 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 2,453 cuft Drainage area = 4.080 ac Runoff coeff. = 0.2 Intensity = 5.567 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 15 0 2 4 6 8 10 12 14 16 18 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 Q (cfs) Time (min) Proposed Area 1 Hyd. No. 2 -- 10 Year Hyd No. 2 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 3 Water Quality Basin Hydrograph type = Reservoir Peak discharge = 0.000 cfs Storm frequency = 10 yrs Time to peak = n/a Time interval = 1 min Hyd. volume = 0 cuft Inflow hyd. No. = 2 - Proposed Area 1 Max. Elevation = 204.63 ft Reservoir name = Pond 1 Max. Storage = 2,453 cuft Storage Indication method used. 16 0 2 4 6 8 10 12 14 16 18 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 Q (cfs) Time (min) Water Quality Basin Hyd. No. 3 -- 10 Year Hyd No. 3 Hyd No. 2 Total storage used = 2,453 cuft Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 4 Existing Area 2 Hydrograph type = Rational Peak discharge = 2.940 cfs Storm frequency = 10 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 1,587 cuft Drainage area = 2.640 ac Runoff coeff. = 0.2 Intensity = 5.567 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 17 0 2 4 6 8 10 12 14 16 18 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 Q (cfs) Time (min) Existing Area 2 Hyd. No. 4 -- 10 Year Hyd No. 4 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 5 Proposed Area 2 Hydrograph type = Rational Peak discharge = 1.052 cfs Storm frequency = 10 yrs Time to peak = 22 min Time interval = 1 min Hyd. volume = 1,388 cuft Drainage area = 1.540 ac Runoff coeff. = 0.2 Intensity = 3.415 in/hr Tc by TR55 = 22.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 18 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 Q (cfs) Time (min) Proposed Area 2 Hyd. No. 5 -- 10 Year Hyd No. 5 Hydrograph Summary Report 19 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 Rational 3.999 1 9 2,159 ------ ------ ------ Existing Area 1 2 Rational 5.475 1 9 2,956 ------ ------ ------ Proposed Area 1 3 Reservoir 0.000 1 n/a 0 2 204.74 2,956 Water Quality Basin 4 Rational 3.543 1 9 1,913 ------ ------ ------ Existing Area 2 5 Rational 1.268 1 22 1,674 ------ ------ ------ Proposed Area 2 GSD 69 - Drainage Calculations - V1.gpw Return Period: 25 Year Friday, Apr 5, 2024 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 1 Existing Area 1 Hydrograph type = Rational Peak discharge = 3.999 cfs Storm frequency = 25 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 2,159 cuft Drainage area = 2.980 ac Runoff coeff. = 0.2 Intensity = 6.710 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 20 0 2 4 6 8 10 12 14 16 18 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 Area 1 Hyd. No. 1 -- 25 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 2 Proposed Area 1 Hydrograph type = Rational Peak discharge = 5.475 cfs Storm frequency = 25 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 2,956 cuft Drainage area = 4.080 ac Runoff coeff. = 0.2 Intensity = 6.710 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 21 0 2 4 6 8 10 12 14 16 18 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 6.00 6.00 Q (cfs) Time (min) Proposed Area 1 Hyd. No. 2 -- 25 Year Hyd No. 2 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 3 Water Quality Basin Hydrograph type = Reservoir Peak discharge = 0.000 cfs Storm frequency = 25 yrs Time to peak = n/a Time interval = 1 min Hyd. volume = 0 cuft Inflow hyd. No. = 2 - Proposed Area 1 Max. Elevation = 204.74 ft Reservoir name = Pond 1 Max. Storage = 2,956 cuft Storage Indication method used. 22 0 2 4 6 8 10 12 14 16 18 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 6.00 6.00 Q (cfs) Time (min) Water Quality Basin Hyd. No. 3 -- 25 Year Hyd No. 3 Hyd No. 2 Total storage used = 2,956 cuft Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 4 Existing Area 2 Hydrograph type = Rational Peak discharge = 3.543 cfs Storm frequency = 25 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 1,913 cuft Drainage area = 2.640 ac Runoff coeff. = 0.2 Intensity = 6.710 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 23 0 2 4 6 8 10 12 14 16 18 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 Area 2 Hyd. No. 4 -- 25 Year Hyd No. 4 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 5 Proposed Area 2 Hydrograph type = Rational Peak discharge = 1.268 cfs Storm frequency = 25 yrs Time to peak = 22 min Time interval = 1 min Hyd. volume = 1,674 cuft Drainage area = 1.540 ac Runoff coeff. = 0.2 Intensity = 4.116 in/hr Tc by TR55 = 22.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 24 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 Q (cfs) Time (min) Proposed Area 2 Hyd. No. 5 -- 25 Year Hyd No. 5 Hydrograph Summary Report 25 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 Rational 4.501 1 9 2,431 ------ ------ ------ Existing Area 1 2 Rational 6.162 1 9 3,328 ------ ------ ------ Proposed Area 1 3 Reservoir 0.000 1 n/a 0 2 204.83 3,328 Water Quality Basin 4 Rational 3.987 1 9 2,153 ------ ------ ------ Existing Area 2 5 Rational 1.427 1 22 1,884 ------ ------ ------ Proposed Area 2 GSD 69 - Drainage Calculations - V1.gpw Return Period: 50 Year Friday, Apr 5, 2024 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 1 Existing Area 1 Hydrograph type = Rational Peak discharge = 4.501 cfs Storm frequency = 50 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 2,431 cuft Drainage area = 2.980 ac Runoff coeff. = 0.2 Intensity = 7.552 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 26 0 2 4 6 8 10 12 14 16 18 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 Q (cfs) Time (min) Existing Area 1 Hyd. No. 1 -- 50 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 2 Proposed Area 1 Hydrograph type = Rational Peak discharge = 6.162 cfs Storm frequency = 50 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 3,328 cuft Drainage area = 4.080 ac Runoff coeff. = 0.2 Intensity = 7.552 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 27 0 2 4 6 8 10 12 14 16 18 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 6.00 6.00 7.00 7.00 Q (cfs) Time (min) Proposed Area 1 Hyd. No. 2 -- 50 Year Hyd No. 2 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 3 Water Quality Basin Hydrograph type = Reservoir Peak discharge = 0.000 cfs Storm frequency = 50 yrs Time to peak = n/a Time interval = 1 min Hyd. volume = 0 cuft Inflow hyd. No. = 2 - Proposed Area 1 Max. Elevation = 204.83 ft Reservoir name = Pond 1 Max. Storage = 3,328 cuft Storage Indication method used. 28 0 2 4 6 8 10 12 14 16 18 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 6.00 6.00 7.00 7.00 Q (cfs) Time (min) Water Quality Basin Hyd. No. 3 -- 50 Year Hyd No. 3 Hyd No. 2 Total storage used = 3,328 cuft Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 4 Existing Area 2 Hydrograph type = Rational Peak discharge = 3.987 cfs Storm frequency = 50 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 2,153 cuft Drainage area = 2.640 ac Runoff coeff. = 0.2 Intensity = 7.552 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 29 0 2 4 6 8 10 12 14 16 18 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 Area 2 Hyd. No. 4 -- 50 Year Hyd No. 4 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 5 Proposed Area 2 Hydrograph type = Rational Peak discharge = 1.427 cfs Storm frequency = 50 yrs Time to peak = 22 min Time interval = 1 min Hyd. volume = 1,884 cuft Drainage area = 1.540 ac Runoff coeff. = 0.2 Intensity = 4.633 in/hr Tc by TR55 = 22.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 30 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 Q (cfs) Time (min) Proposed Area 2 Hyd. No. 5 -- 50 Year Hyd No. 5 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 Rational 5.038 1 9 2,721 ------ ------ ------ Existing Area 1 2 Rational 6.898 1 9 3,725 ------ ------ ------ Proposed Area 1 3 Reservoir 0.000 1 n/a 0 2 204.92 3,725 Water Quality Basin 4 Rational 4.464 1 9 2,410 ------ ------ ------ Existing Area 2 5 Rational 1.597 1 22 2,109 ------ ------ ------ Proposed Area 2 GSD 69 - Drainage Calculations - V1.gpw Return Period: 100 Year Friday, Apr 5, 2024 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 1 Existing Area 1 Hydrograph type = Rational Peak discharge = 5.038 cfs Storm frequency = 100 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 2,721 cuft Drainage area = 2.980 ac Runoff coeff. = 0.2 Intensity = 8.454 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 32 0 2 4 6 8 10 12 14 16 18 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 6.00 6.00 Q (cfs) Time (min) Existing Area 1 Hyd. No. 1 -- 100 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 2 Proposed Area 1 Hydrograph type = Rational Peak discharge = 6.898 cfs Storm frequency = 100 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 3,725 cuft Drainage area = 4.080 ac Runoff coeff. = 0.2 Intensity = 8.454 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 33 0 2 4 6 8 10 12 14 16 18 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 6.00 6.00 7.00 7.00 Q (cfs) Time (min) Proposed Area 1 Hyd. No. 2 -- 100 Year Hyd No. 2 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 3 Water Quality Basin Hydrograph type = Reservoir Peak discharge = 0.000 cfs Storm frequency = 100 yrs Time to peak = n/a Time interval = 1 min Hyd. volume = 0 cuft Inflow hyd. No. = 2 - Proposed Area 1 Max. Elevation = 204.92 ft Reservoir name = Pond 1 Max. Storage = 3,725 cuft Storage Indication method used. 34 0 2 4 6 8 10 12 14 16 18 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 6.00 6.00 7.00 7.00 Q (cfs) Time (min) Water Quality Basin Hyd. No. 3 -- 100 Year Hyd No. 3 Hyd No. 2 Total storage used = 3,725 cuft Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 4 Existing Area 2 Hydrograph type = Rational Peak discharge = 4.464 cfs Storm frequency = 100 yrs Time to peak = 9 min Time interval = 1 min Hyd. volume = 2,410 cuft Drainage area = 2.640 ac Runoff coeff. = 0.2 Intensity = 8.454 in/hr Tc by TR55 = 9.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 35 0 2 4 6 8 10 12 14 16 18 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 Q (cfs) Time (min) Existing Area 2 Hyd. No. 4 -- 100 Year Hyd No. 4 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Friday, Apr 5, 2024 Hyd. No. 5 Proposed Area 2 Hydrograph type = Rational Peak discharge = 1.597 cfs Storm frequency = 100 yrs Time to peak = 22 min Time interval = 1 min Hyd. volume = 2,109 cuft Drainage area = 1.540 ac Runoff coeff. = 0.2 Intensity = 5.186 in/hr Tc by TR55 = 22.00 min IDF Curve = GSD-60 NOAA.IDF Asc/Rec limb fact = 1/1 36 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 Q (cfs) Time (min) Proposed Area 2 Hyd. No. 5 -- 100 Year Hyd No. 5 4/5/24, 4:03 PM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/pfds/pfds_printpage.html?lat=41.4238&lon=-72.2074&data=intensity&units=english&series=pds#top 1/4 NOAA Atlas 14, Volume 10, Version 3 Location name: Oakdale, Connecticut, USA* Latitude: 41.4238°, Longitude: -72.2074° Elevation: 217 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 (3.16‑5.06) 4.85 (3.77‑6.06) 6.14 (4.76‑7.70) 7.24 (5.58‑9.12) 8.72 (6.52‑11.4) 9.84 (7.20‑13.1) 11.0 (7.85‑15.2) 12.4 (8.33‑17.3) 14.3 (9.28‑20.6) 15.9 (10.1‑23.3) 10-min 2.87 (2.23‑3.59) 3.44 (2.67‑4.30) 4.36 (3.38‑5.47) 5.12 (3.94‑6.45) 6.18 (4.61‑8.09) 6.97 (5.10‑9.29) 7.81 (5.56‑10.8) 8.77 (5.90‑12.3) 10.1 (6.57‑14.6) 11.3 (7.13‑16.5) 15-min 2.25 (1.75‑2.81) 2.70 (2.10‑3.37) 3.42 (2.65‑4.29) 4.02 (3.10‑5.06) 4.85 (3.62‑6.34) 5.47 (4.00‑7.29) 6.12 (4.36‑8.44) 6.87 (4.62‑9.60) 7.95 (5.15‑11.5) 8.84 (5.60‑13.0) 30-min 1.58 (1.23‑1.98) 1.89 (1.47‑2.37) 2.40 (1.86‑3.01) 2.83 (2.18‑3.56) 3.41 (2.54‑4.45) 3.84 (2.81‑5.12) 4.30 (3.06‑5.92) 4.82 (3.25‑6.74) 5.57 (3.61‑8.03) 6.19 (3.92‑9.07) 60-min 1.02 (0.793‑1.27) 1.22 (0.948‑1.52) 1.55 (1.20‑1.94) 1.82 (1.40‑2.29) 2.19 (1.64‑2.87) 2.47 (1.81‑3.30) 2.77 (1.97‑3.81) 3.10 (2.09‑4.34) 3.59 (2.32‑5.16) 3.98 (2.52‑5.84) 2-hr 0.670 (0.525‑0.832) 0.800 (0.627‑0.994) 1.01 (0.790‑1.26) 1.19 (0.923‑1.49) 1.43 (1.08‑1.86) 1.61 (1.19‑2.14) 1.81 (1.30‑2.47) 2.03 (1.37‑2.82) 2.36 (1.54‑3.37) 2.64 (1.68‑3.83) 3-hr 0.519 (0.408‑0.641) 0.619 (0.486‑0.765) 0.782 (0.613‑0.970) 0.917 (0.715‑1.14) 1.10 (0.834‑1.43) 1.24 (0.920‑1.64) 1.39 (1.00‑1.90) 1.56 (1.06‑2.16) 1.82 (1.19‑2.59) 2.04 (1.30‑2.94) 6-hr 0.331 (0.263‑0.406) 0.394 (0.312‑0.484) 0.496 (0.392‑0.611) 0.581 (0.457‑0.720) 0.699 (0.531‑0.898) 0.786 (0.586‑1.03) 0.879 (0.637‑1.19) 0.989 (0.674‑1.35) 1.15 (0.754‑1.62) 1.29 (0.823‑1.84) 12-hr 0.204 (0.163‑0.249) 0.242 (0.193‑0.296) 0.305 (0.243‑0.373) 0.357 (0.283‑0.439) 0.429 (0.328‑0.546) 0.482 (0.361‑0.626) 0.539 (0.393‑0.722) 0.605 (0.415‑0.819) 0.703 (0.462‑0.977) 0.784 (0.503‑1.11) 24-hr 0.120 (0.097‑0.145) 0.143 (0.115‑0.174) 0.182 (0.146‑0.221) 0.214 (0.170‑0.261) 0.257 (0.198‑0.326) 0.290 (0.219‑0.374) 0.325 (0.238‑0.432) 0.366 (0.252‑0.491) 0.426 (0.282‑0.587) 0.477 (0.307‑0.668) 2-day 0.067 (0.054‑0.080) 0.081 (0.066‑0.097) 0.104 (0.084‑0.125) 0.123 (0.099‑0.149) 0.149 (0.116‑0.188) 0.168 (0.128‑0.216) 0.189 (0.140‑0.251) 0.215 (0.148‑0.285) 0.253 (0.167‑0.345) 0.285 (0.184‑0.395) 3-day 0.048 (0.039‑0.058) 0.058 (0.048‑0.070) 0.075 (0.061‑0.090) 0.089 (0.072‑0.107) 0.108 (0.084‑0.135) 0.122 (0.093‑0.155) 0.137 (0.102‑0.180) 0.155 (0.107‑0.205) 0.183 (0.121‑0.248) 0.207 (0.134‑0.285) 4-day 0.039 (0.032‑0.046) 0.047 (0.038‑0.056) 0.060 (0.049‑0.072) 0.071 (0.057‑0.085) 0.086 (0.067‑0.107) 0.097 (0.074‑0.123) 0.109 (0.081‑0.143) 0.123 (0.085‑0.162) 0.145 (0.096‑0.196) 0.164 (0.106‑0.224) 7-day 0.026 (0.022‑0.031) 0.031 (0.026‑0.037) 0.039 (0.032‑0.047) 0.046 (0.038‑0.055) 0.055 (0.044‑0.069) 0.062 (0.048‑0.079) 0.070 (0.052‑0.091) 0.079 (0.055‑0.103) 0.092 (0.061‑0.123) 0.103 (0.067‑0.140) 10-day 0.021 (0.017‑0.025) 0.025 (0.020‑0.030) 0.031 (0.025‑0.037) 0.036 (0.029‑0.043) 0.043 (0.034‑0.053) 0.048 (0.037‑0.060) 0.053 (0.040‑0.069) 0.060 (0.042‑0.077) 0.069 (0.046‑0.092) 0.077 (0.050‑0.103) 20-day 0.015 (0.012‑0.018) 0.017 (0.014‑0.020) 0.020 (0.017‑0.024) 0.023 (0.019‑0.027) 0.026 (0.021‑0.032) 0.029 (0.022‑0.036) 0.032 (0.024‑0.040) 0.035 (0.025‑0.045) 0.039 (0.026‑0.052) 0.042 (0.028‑0.057) 30-day 0.012 (0.010‑0.015) 0.014 (0.011‑0.016) 0.016 (0.013‑0.019) 0.018 (0.015‑0.021) 0.020 (0.016‑0.025) 0.022 (0.017‑0.027) 0.024 (0.018‑0.030) 0.026 (0.018‑0.033) 0.029 (0.019‑0.037) 0.030 (0.020‑0.040) 45-day 0.010 (0.009‑0.012) 0.011 (0.009‑0.013) 0.013 (0.011‑0.015) 0.014 (0.012‑0.016) 0.016 (0.012‑0.019) 0.017 (0.013‑0.021) 0.018 (0.014‑0.023) 0.020 (0.014‑0.025) 0.021 (0.014‑0.028) 0.022 (0.014‑0.029) 60-day 0.009 (0.007‑0.010) 0.010 (0.008‑0.011) 0.011 (0.009‑0.013) 0.012 (0.010‑0.014) 0.013 (0.010‑0.016) 0.014 (0.011‑0.017) 0.015 (0.011‑0.019) 0.016 (0.011‑0.021) 0.017 (0.012‑0.022) 0.018 (0.012‑0.024) 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 not checked 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 4/5/24, 4:03 PM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/pfds/pfds_printpage.html?lat=41.4238&lon=-72.2074&data=intensity&units=english&series=pds#top 2/4 Back to Top Maps & aerials Small scale terrain 4/5/24, 4:03 PM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/pfds/pfds_printpage.html?lat=41.4238&lon=-72.2074&data=intensity&units=english&series=pds#top 3/4 Large scale terrain Large scale map Large scale aerial + – 3km 2mi + – 100km 60mi + – 100km 60mi 4/5/24, 4:03 PM Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/pfds/pfds_printpage.html?lat=41.4238&lon=-72.2074&data=intensity&units=english&series=pds#top 4/4 Back to Top US Department of Commerce National Oceanic and Atmospheric Administration National Weather Service National Water Center 1325 East West Highway Silver Spring, MD 20910 Questions?: HDSC.Questions@noaa.gov Disclaimer + – 100km 60mi Soil Map—State of Connecticut, Eastern Part (1492 Hartford - New London Turnpike) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 4/5/2024 Page 1 of 3458951045895404589570458960045896304589660458969045897204589750458978045898104589540458957045896004589630458966045896904589720458975045897804589810733120733150733180733210733240733270733300733330 733120 733150 733180 733210 733240 733270 733300 733330 41° 25' 33'' N 72° 12' 37'' W41° 25' 33'' N72° 12' 27'' W41° 25' 23'' N 72° 12' 37'' W41° 25' 23'' N 72° 12' 27'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 18N WGS84 0 50 100 200 300 Feet 0 20 40 80 120 Meters Map Scale: 1:1,510 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:12,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: State of Connecticut, Eastern Part Survey Area Data: Version 1, Sep 15, 2023 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jun 14, 2022—Oct 6, 2022 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Soil Map—State of Connecticut, Eastern Part (1492 Hartford - New London Turnpike) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 4/5/2024 Page 2 of 3 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 3 Ridgebury, Leicester, and Whitman soils, 0 to 8 percent slopes, extremely stony 0.3 5.0% 29A Agawam fine sandy loam, 0 to 3 percent slopes 1.7 29.6% 84B Paxton and Montauk fine sandy loams, 3 to 8 percent slopes 1.8 31.7% 84C Paxton and Montauk fine sandy loams, 8 to 15 percent slopes 2.0 33.7% Totals for Area of Interest 5.8 100.0% Soil Map—State of Connecticut, Eastern Part 1492 Hartford - New London Turnpike Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 4/5/2024 Page 3 of 3