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Home My WebLink AboutDrainageReport-POS001 Drainage Calculations Post Residence Single Family Home 1730 East 106th Street Carmel, Indiana 46280 Job #: POS.0001 Original Date: 12-07-21 Revised Date: N/A Prepared by: Eric A. Gleissner, P.E. Reviewed by: Brian Cross, P.E. 718 Adams Street Suite E Carmel, IN 46032 Phone: 317-810-1677 TABLE OF CONTENTS Section I: Report A. Project Title B. Project Description C. Design Method and Criteria D. References E. Existing Conditions F. Proposed Conditions Section II: Appendix A. Site Information B. Existing Conditions (Exhibits, Calculations, etc.) C. Proposed Conditions (Exhibits, Calculations, etc.) D. ICPR Input Data SECTION I: REPORT A. Project Title Post Residence – Single-Family Home (1730 East 106th Street; Carmel, IN 46280) B. Project Description This project is located on the northeast corner of the intersection of Westfield Boulevard (Rangeline Road) and East 106th Street in Hamilton County, Indiana. The subject site is located within the corporate limits of the City of Carmel. The subject site consists of two (2) parcels totaling 3.34 +/- acres in size. There are currently two existing garages (accessory structures) and three single-family homes that have recently been demolished. One single-family home is being proposed in place of the recently demolished homes. Drainage improvements will consist of a dry detention basin per requirements from the City of Carmel Engineering Department. C. Design Method and Criteria 1. Soil Type: Soil maps from the United States Department of Agriculture, Soil Conservation Service, identify Shoals Silt Loam (YshAH - 3% Site) Type "C" Soil and Miami Silt Loam (YmsB2 & YmsC2- 97% Site) Type "C" Soil. 2. Design Storm: The 2, 10 and 100-year storm events have been analyzed for both the existing and proposed overall conditions. Hydraulics / Hydrology and detention sizing was performed using the SCS-II 24-hour rainfall distribution with ICPR Software. 3. Overall Watershed: The existing topography on the subject site flows in multiple directions; however, everything eventually makes its way to the north ultimately discharging into Carmel Creek. D. References 1. TR55 Stormwater Design Manual. 2. Hamilton County Soil Survey. 3. Highway Extension and Research Project for Indiana Counties (HERPIC). 4. City of Carmel Technical Standards Manual E. Existing Conditions The existing 3.34+/- acre site generally drains from the center to the south, north and west; however, everything eventually makes its way to the north ultimately discharging into Carmel Creek (see Appendix Ex. “A”). A 24-hour duration storm event was analyzed using the SCS-II rainfall distribution. The following table summarizes the maximum discharge rates for the disturbed area (0.79+/- acres) in the existing conditions: DRAINAGE BASIN RUNOFF (CFS) SCS II 24-Hour Hydrograph BASIN EX1 (Disturbed Area 0.79+/- Acres) 2-YEAR 1.24 cfs 10-YEAR 2.28 cfs 100-YEAR 4.73 cfs Table 1: Existing Conditions F. Proposed Conditions The proposed drainage patterns for the site will remain nearly identical to the existing conditions. The demolition of the existing three (3) single-family homes results in the proposed single-family home having a negligible net increase of 0.01+/- acres of impervious surface. A dry detention basin is being proposed on the southern half of the property to control stormwater runoff as required per the City of Carmel Engineering Department. The detention basin will discharge into the existing swale bisecting the site ultimately discharging into Carmel Creek along the northern boundary of the subject site. A 24-hour duration storm event was analyzed using the SCS-II rainfall distribution. The disturbed area (0.79+/- acres) was modeled in the fully developed conditions. The following table summarizes the maximum discharge rates leaving the proposed dry detention basin through the minimum sized 6” diameter outlet pipe: DRAINAGE BASIN RUNOFF (CFS) SCS-II, 24-hour BASIN POND EX1 2-YEAR 0.77 cfs < 1.25 cfs 10-YEAR 0.99 cfs < 2.28 cfs 100-YEAR 1.29 cfs < 4.73 cfs Table 2: Proposed Conditions SECTION II: APPENDIX A. Site Information Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 12/6/2021 Page 1 of 344216404421650442166044216704421680442169044217004421710442172044217304421740442175044217604421640442165044216604421670442168044216904421700442171044217204421730442174044217504421760574650574660574670574680574690574700574710574720574730 574650 574660 574670 574680 574690 574700 574710 574720 574730 574740 39° 56' 33'' N 86° 7' 34'' W39° 56' 33'' N86° 7' 30'' W39° 56' 29'' N 86° 7' 34'' W39° 56' 29'' N 86° 7' 30'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 16N WGS84 0 30 60 120 180 Feet 0 5 10 20 30 Meters Map Scale: 1:640 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 1:15,800. 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: Hamilton County, Indiana Survey Area Data: Version 22, Sep 9, 2021 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Aug 1, 2018—Sep 30, 2018 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—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 12/6/2021 Page 2 of 3 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI YmsB2 Miami silt loam-Urban land complex, 2 to 6 percent slopes, eroded 0.0 4.7% YmsC2 Miami silt loam-Urban land complex, 6 to 12 percent slopes, eroded 0.8 92.5% YshAH Shoals silt loam-Urban land complex, 0 to 2 percent slopes, frequently flooded, brief duration 0.0 2.8% Totals for Area of Interest 0.8 100.0% Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 12/6/2021 Page 3 of 3 B. Existing Conditions EXISTING CONDITIONSRunoff CurveCoefficient NumberImpervious Area = 0.90 98Open Area = 0.20 74 **Open Space (Good Condition)Gravel/Stone = 0.50 89Miami SIlt Loam (YmsB2 & YmsC2 - 97% Site) Type "C" SoilShoals Silt Loam (YshAH - 3% Site) Type "C" SoilON SITE (EX1) - Disturbed AreaImpervious Area Open Area Stone Total Total Composite(ft^2) (ft^2) (ft^2) (ft^2) (Acres) "CN"10320 23474 468 34262 0.79 81.4 Overland flowseg. 1 Shallow Concentrated FlowBasin Length S n T_t Length S Paved/Un Vel. T_tT_cname (ft) % (min) (ft) % (P or U) (ft/s) (min)(min)EX1 100 4.50 0.150755 4.50 U3.42 08 Existing Conditions ICPR Data Simulation Basin Group Time Max Flow Max Volume Volume hrs cfs in ft3 -------------------------------------------------------------------------------------- 100YR-24HR EX1 PRE 12.02 4.73 4.342 12452 10YR-24HR EX1 PRE 12.02 2.28 2.008 5759 2YR-24HR EX1 PRE 12.02 1.24 1.080 3097 C. Proposed Conditions PROPOSED CONDITIONSDETENTION BASIN STORAGERunoff Curve ELEV. AREA AREA StorageCoefficient Number (ft.) (ft^2) (Acres) (acre-ft)Impervious Area = 0.90 98 799.90 3 0.0001Open Area = 0.20 74 **Open Space (Good Condition) 800 252 0.0058 0.0003Gravel/Stone = 0.50 89 801 813 0.0187 0.0122802 1133 0.0260 0.0223803 1775 0.0407 0.0334Miami SIlt Loam (YmsB2 & YmsC2 - 97% Site) Type "C" Soil804 2434 0.0559 0.0483Shoals Silt Loam (YshAH - 3% Site) Type "C" SoilStorage = 0.117 acre-ftON SITE (PR1) - Disturbed AreaImpervious Area Open Area Stone Total Total Composite(ft^2) (ft^2) (ft^2) (ft^2) (Acres) "CN"10773 22366 1123 34262 0.79 82.0 Overland flowseg. 1 Shallow Concentrated FlowBasin Length S n T_t Length S Paved/Un Vel. T_tT_cname (ft) % (min) (ft) % (P or U) (ft/s) (min)(min)PR1 100 5.00 0.150725 5.00 U3.61 07 Detention Basin ICPR Output Max Time Max Warning Max Delta Max Surf Max Time Max Max Time Max Name Group Simulation Stage Stage Stage Stage Area Inflow Inflow Outflow Outflow hrs ft ft ft ft2 hrs cfs hrs cfs --------------------------------------------------------------------------------------------------------------------------------------- POND POST 100YEAR-24HR 12.16 803.38 804.00 0.0050 2025 12.00 4.84 12.16 1.29 POND POST 10YEAR-24HR 12.13 801.76 804.00 0.0050 1061 12.00 2.35 12.13 0.99 POND POST 2YEAR-24HR 12.09 800.92 804.00 0.0050 775 12.00 1.29 12.09 0.77 D. ICPR Input Data ICPR Input Data ========================================================================================== ==== Basins ============================================================================== ========================================================================================== Name: EX1 Node: EX1 Status: Onsite Group: PRE Type: SCS Unit Hydrograph CN Unit Hydrograph: Uh484 Peaking Factor: 484.0 Rainfall File: Storm Duration(hrs): 0.00 Rainfall Amount(in): 0.000 Time of Conc(min): 8.00 Area(ac): 0.790 Time Shift(hrs): 0.00 Curve Number: 81.40 Max Allowable Q(cfs): 999999.000 DCIA(%): 0.00 ---------------------------------------------------------------------------------------------------- Name: PR1 Node: POND Status: Onsite Group: POST Type: SCS Unit Hydrograph CN Unit Hydrograph: Uh484 Peaking Factor: 484.0 Rainfall File: Storm Duration(hrs): 0.00 Rainfall Amount(in): 0.000 Time of Conc(min): 7.00 Area(ac): 0.790 Time Shift(hrs): 0.00 Curve Number: 82.00 Max Allowable Q(cfs): 999999.000 DCIA(%): 0.00 ========================================================================================== ==== Nodes =============================================================================== ========================================================================================== Name: BOUNDARY Base Flow(cfs): 0.000 Init Stage(ft): 799.000 Group: POST Warn Stage(ft): 799.000 Type: Time/Stage Time(hrs) Stage(ft) --------------- --------------- 0.00 799.000 12.00 799.000 24.00 799.000 ------------------------------------------------------------------------------------------ Name: POND Base Flow(cfs): 0.000 Init Stage(ft): 799.900 Group: POST Warn Stage(ft): 804.000 Type: Stage/Area Stage(ft) Area(ac) --------------- --------------- 799.900 0.0001 800.000 0.0058 801.000 0.0187 802.000 0.0260 803.000 0.0407 804.000 0.0559 ========================================================================================== ==== Pipes =============================================================================== ========================================================================================== Name: OUTLET From Node: POND Length(ft): 90.00 Group: POST To Node: BOUNDARY Count: 1 Friction Equation: Automatic UPSTREAM DOWNSTREAM Solution Algorithm: Most Restrictive Geometry: Circular Circular Flow: Both Span(in): 6.00 6.00 Entrance Loss Coef: 0.00 Rise(in): 6.00 6.00 Exit Loss Coef: 1.00 Invert(ft): 799.900 799.000 Bend Loss Coef: 0.00 Manning's N: 0.011000 0.011000 Outlet Ctrl Spec: Use dc or tw Top Clip(in): 0.000 0.000 Inlet Ctrl Spec: Use dc Bot Clip(in): 0.000 0.000 Stabilizer Option: None Upstream FHWA Inlet Edge Description: Circular Concrete: Square edge w/ headwall Downstream FHWA Inlet Edge Description: Circular Concrete: Square edge w/ headwall ========================================================================================== ==== Hydrology Simulations =============================================================== ========================================================================================== Name: 100YR-24HR Filename: P:\SPF.001 - Sweet Peas Flower Farm\Drainage\ICPR\100YR-24HR.R32 Override Defaults: Yes Storm Duration(hrs): 24.00 Rainfall File: Scsii-24 Rainfall Amount(in): 6.46 Time(hrs) Print Inc(min) --------------- --------------- 30.000 5.00 ---------------------------------------------------------------------------------------------------- Name: 10YR-24HR Filename: P:\SPF.001 - Sweet Peas Flower Farm\Drainage\ICPR\10YR-24HR.R32 Override Defaults: Yes Storm Duration(hrs): 24.00 Rainfall File: Scsii-24 Rainfall Amount(in): 3.83 Time(hrs) Print Inc(min) --------------- --------------- 30.000 5.00 ---------------------------------------------------------------------------------------------------- Name: 2YR-24HR Filename: P:\SPF.001 - Sweet Peas Flower Farm\Drainage\ICPR\2YR-24HR.R32 Override Defaults: Yes Storm Duration(hrs): 24.00 Rainfall File: Scsii-24 Rainfall Amount(in): 2.66 Time(hrs) Print Inc(min) --------------- --------------- 30.000 5.00 ========================================================================================== ==== Routing Simulations ================================================================= ========================================================================================== Name: 100YEAR-24HR Hydrology Sim: 100YR-24HR Filename: P:\SPF.001 - Sweet Peas Flower Farm\Drainage\ICPR\100YEAR-24HR.I32 Execute: Yes Restart: No Patch: No Alternative: No Max Delta Z(ft): 1.00 Delta Z Factor: 0.00500 Time Step Optimizer: 10.000 Start Time(hrs): 0.000 End Time(hrs): 30.00 Min Calc Time(sec): 0.5000 Max Calc Time(sec): 60.0000 Boundary Stages: Boundary Flows: Time(hrs) Print Inc(min) --------------- --------------- 999.000 15.000 Group Run --------------- ----- POST Yes ---------------------------------------------------------------------------------------------------- Name: 10YEAR-24HR Hydrology Sim: 10YR-24HR Filename: P:\SPF.001 - Sweet Peas Flower Farm\Drainage\ICPR\10YEAR-24HR.I32 Execute: Yes Restart: No Patch: No Alternative: No Max Delta Z(ft): 1.00 Delta Z Factor: 0.00500 Time Step Optimizer: 10.000 Start Time(hrs): 0.000 End Time(hrs): 30.00 Min Calc Time(sec): 0.5000 Max Calc Time(sec): 60.0000 Boundary Stages: Boundary Flows: Time(hrs) Print Inc(min) --------------- --------------- 999.000 15.000 Group Run --------------- ----- POST Yes ---------------------------------------------------------------------------------------------------- Name: 2YEAR-24HR Hydrology Sim: 2YR-24HR Filename: P:\SPF.001 - Sweet Peas Flower Farm\Drainage\ICPR\2YEAR-24HR.I32 Execute: Yes Restart: No Patch: No Alternative: No Max Delta Z(ft): 1.00 Delta Z Factor: 0.00500 Time Step Optimizer: 10.000 Start Time(hrs): 0.000 End Time(hrs): 30.00 Min Calc Time(sec): 0.5000 Max Calc Time(sec): 60.0000 Boundary Stages: Boundary Flows: Time(hrs) Print Inc(min) --------------- --------------- 999.000 15.000 Group Run --------------- ----- POST Yes