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Home My WebLink AboutStormwater Drainage ReportSTORMWATER DRAINAGE REPORT Hamilton Crossing Building VII Carmel, IN DEVELOPER: Duke Realty th 600 East 96 Street, Suite 100 Indianapolis, IN 46240 PREPARED BY: 151 N. Delaware Street, Suite 800 Indianapolis, IN 46204 Report Date: May 22, 2015 TABLE OF CONTENTS Stormwater Drainage Summary Appendix A Site Maps Appendix B Location Map USGS Topographic Map Floodplain Map Soils Map Wetlands Map Existing Conditions Exhibit Impervious/Pervious Areas Exhibit Storm Sewer Design Appendix C Storm Sewer Inlet Basin Map Composite Cv Calculations Rational Method/ Pipe Design/ HGL Calculations – Hydraflow Inlet Capacity Calculations Appendix D Water Quality Appendix E Water Quality Basin Map Water Quality Curve Number Selection ICPR Basin Summary – 1” Storm Event Stormwater Quality Unit Selection Chart ICPR Node Diagram – Diversion Manhole Design ICPR Node Max Comparison – Diversion Manhole Design ICPR Input Report – Diversion Manhole Design Reference Material Appendix F Excerpts from “Stormwater Management Design Calculations on Meridian Corners” report, dated January 1989 by Cripe, Inc. STORMWATER DRAINAGE SUMMARY APPENDIX A STORMWATER DRAINAGE SUMMARY Project: Hamilton Crossing Building VII Location: Carmel, IN Introduction Duke Realty is proposing the development of a new commercial building & supporting infrastructure located east of Hamilton Crossing Boulevard and just west of U.S. 31 in the overall Hamilton Crossing commercial development. The new building will be #7 and it will be located due north of building #3 and due south of building #4. The site is located in the Southwest Quarter of Section 26, Township 18 North, Range 3 East, Hamilton County, Carmel, IN. The project boundary for the new tract (for this building) is approximately 3.90 acres in size and the site will consist of a building, parking, sidewalks, parking lot islands, and a relocated asphalt path on the east side of the site along U.S. 31. The proposed drainage improvements are designed to conform to the City of Carmel drainage requirements. Drainage improvements include gravity storm sewer and one post-construction BMP mechanical structure (Aqua-Swirl). Existing Conditions The existing site is a previously developed site at Hamilton Crossing commercial development, primarily comprised of an existing asphalt parking lot with miscellaneous areas of greenspace and concrete. There is also a small existing storage building in the north part of the project site that will be demolished with development and a mail drop structure that will be demolished as well. The majority of the existing site drainage is collected in storm inlets located in the existing parking lot and routed south via a 24” RCP storm line to the storm sewer system located in the parking lot of Hamilton Crossing Building #3. In the north part of the site, existing site drainage is picked up by inlets that route to the storm sewer system in the parking lot of Hamilton Crossing Building #4. On the eastern edge of the site, water sheet drains to the existing U.S. 31 ditch, and on the western edge of the site, water sheet drains to inlets in Hamilton Crossing Boulevard. Ultimately, all drainage from the existing project site that does not sheet drain to the U.S. 31 ditch is routed to the existing wet pond detention facility located just southwest of North Illinois Street. This detention facility is ultimately tributary to Williams Creek. Adjoining Land Conditions North: Existing Commercial Development South: Existing Commercial Development East: U.S. 31/Existing Commercial Development West: Existing Commercial Development Soils Types Soils maps from the United States Department of Agriculture, Soil Conservation Service identify Brookston and Crosby soils on the subject site. Brookston silt loam (Br) is classified as hydrologic group B, while Crosby silt loam (CrA) is classified as hydrologic group C. Stormwater Management Design The proposed development will add several storm inlet structures and remove a couple of storm structures in order to make the proposed infrastructure mesh with the existing infrastructure. All site drainage west of the relocated asphalt path along the east boundary of the site will ultimately route to the existing wet pond detention facility just southwest of North Illinois Street which serves the overall Hamilton Crossing Development. Detention for the project site has been provided for in this existing facility. Please refer to the excerpts from the January 1989 master drainage report by Cripe, Inc. located in Appendix F. This reference material has watershed maps and a drainage summary of the overall Hamilton Crossing Development. The storm sewer network consists of inlet structures and stormwater pipes to direct runoff to the point of discharge of the site. The design storm for the storm sewer pipes and inlets is the 10 year event. This criterion allows the capture and routing of runoff to the downstream conveyance system with minimal negative impacts to the site improvements. All storm sewer structures were designed with a minimum invert elevation drop of 0.10 ft across the structure to account for losses where possible. A minimum of 2.0 feet of cover is maintained over the top of the storm sewer pipes. Pipe reaches are designed with straight alignments and uniform grades between structures. It has been assumed that all inlets for this project have a time of concentration of 5 minutes. Erosion Control and Water Quality Compliance An on-site erosion control plan is designed to minimize the movement of sediments and other pollutants both during construction and immediately after the completion of construction. The intent of the plan is to comply with current IDEM “Rule 5” requirements. See the Site Construction Plans for Erosion Control Plan Details and Specifications. Post-construction water quality treatment is addressed by utilizing a mechanical BMP unit (Aqua-Swirl specified in the construction plans and calcs herein) to treat 0.84 acres of watershed, including the entire building #7 footprint. Per the pre-post impervious areas exhibit located in Appendix B, the net increase of impervious area with this development is 0.78 acres. Please refer to the calculations in Appendix E for the sizing of the mechanical BMP unit. SITE MAPS APPENDIX B City of Carmel Hamilton County Carmel Project Area £ ¤ 31 Ê Hamilton Crossing Building VII Aerial Location Map Graphic Scale (Feet) 08001,6002,400 Carmel, Indiana May 2015 1 inch = 2,000 feet Sources: IndianaMap and Indiana Spatial Data Portal Ê Sources: IndianaMap, Indiana Spatial Data Portal and WebSoilSurvey Hamilton Crossing Building VII Legend USGS Topographic Map Graphic Scale (Feet) Project Area 05001,0001,500 Carmel, Indiana May 2015 1 inch = 1,000 feet Legend Corporate Limits Project Area Flowline Type (NHD) Stream / River Canal / Ditch Artificial Path Pipeline Connector Flood Zone (FEMA, FIRM) 0.2% Annual Chance Flood Hazard A AE AH AO X Floodway £ ¤ 31 Sources: IndianaMap and Indiana Spatial Data Portal Ê Hamilton Crossing Building VII Floodplain Map Graphic Scale (Feet) 0250500750 Carmel, Indiana May 2015 1 inch = 500 feet WMmB2 CrA CrA Br Map symbols consist of a combination of letters or of letters and numbers. The first capital letter is the initial one of the soil name. The second letter is lowercase and separates map units whose names begin with the same letter. The third letter is a capital letter and indicates the class of slope. Symbols without a slope letter are for miscellaneous areas, Udorthents, or nearly level soils. Some symbols have a number at the end and are eroded Sh phases. A final number of 2 indicates that the soil is moderately eroded, and a number 3 indicates that the soil CrA is severely eroded. SymbolName BrBrookston silty clay loam CrACrosby silt loam, 0 to 3 percent slopes CrA CrA Br W CrA Br Br MmB2 CrA CrA W MmB2 CrA FnB2 Br St CrA MmB2 Sh MmB2 MmA CrA OcA MmB2 CrA MmB2 MmB2 Sources: IndianaMap, Indiana Spatial Data Portal and WebSoilSurvey Br Ê Sources: IndianaMap, Indiana Spatial Data Portal and WebSoilSurvey Legend Hamilton Crossing Building VII Project Area Soils Map and Legend Graphic Scale (Feet) 0200400600 Carmel, Indiana May 2015 1 inch = 500 feet Legend Corporate Limits Project Area Wetland Type Freshwater Emergent Wetland PUBGx Freshwater Forested/Shrub Wetland £ ¤ 31 Freshwater Pond PUBGx PUBGx Lake Riverine PUBGx PUBGx PUBGx PUBGx Other PUBGx PUBGx PUBGx PEM1A PUBGx PUBGx PUBGx PFO1A PUBGx PUBGx PUBFh PUBGx PUBGx PFO1C PFO1A PUBGx Sources: IndianaMap, Indiana Spatial Data Portal and U.S. Fish & Wildlife Service National Wetlands Inventory (as of 05-01-14) Ê Hamilton Crossing Building VII Wetlands Area Map Graphic Scale (Feet) 04008001,200 Carmel, Indiana May 2015 1 inch = 800 feet STORM SEWER DESIGN APPENDIX C COMPOSITE "c" VALUES5/21/2015 A= Total hard surface (walk, pavement, roofs) imp IğƒźƌƷƚƓ/ƩƚƭƭźƓŭLL Project: A= Total Drainage Area - A perimp 2015056 HWC Job Number: C= (0.9A + 0.2A) / Total Drainage Area wimpper Str. #TotalTotal ImperviousTotal Pervious Composite DrainageAreaArea"c" Value AA Area impper C (AC)(AC)(AC) w EX 20.7280.6450.0830.82 1010.1640.1470.0170.83 1020.2190.1960.0230.83 1031.0660.8400.2260.75 1040.1530.0910.0620.62 1050.4620.3200.1420.68 1070.3270.3090.0180.86 1080.1230.1150.0080.85 1100.1630.1450.0180.82 1120.1120.1060.0060.86 1130.0930.0630.0300.67 1160.1560.1560.0000.90 1170.2940.2490.0450.79 1180.0180.0020.0160.28 1190.0330.0030.0300.26 1200.3390.3140.0250.85 INLET CAPACITY CALCULATIONS APPENDIX D INLET CAPACITY CALCULATIONS5/21/2015 Project:Hamilton Crossing VII HWC Job Number:2015-056 Weir Condition (d<0.3') Orifice Condition (d>0.4') R3433R3275 22 OpenArea,A(ft)=OpenArea,A(ft)= 1.51 WeirPerimeter,P(ft)=7.9WeirPerimeter,P(ft)=4.6 22 A,50%Clogged(ft)=A,50%Clogged(ft)= 0.750.5 P,50%Clogged(ft)=3.95P,50%Clogged(ft)=2.3 DepthDepthDepthCasting QWeirOrificeControllingMaximum DepthType Str. #(cfs)(ft)(ft)(ft)0.5 ft(Neenah) 1010.960.190.070.19OK3433 1021.320.230.130.23OK3433 103 *5.810.622.512.51N/A3433 1040.670.150.030.15OK3433 1052.260.330.380.33OK3433 1072.050.310.310.31OK3433 1080.740.160.040.16OK3433 1100.950.190.070.19OK3433 1120.680.210.080.21OK3275 1130.440.160.030.16OK3275 1171.660.270.200.27OK3433 1202.090.310.320.31OK3433 *Str.103flowrateisbasedonanoverallbasinattacheddirectlytothisstructure,wheninfact thebasindrainsfromtheroofofBldg3andthroughanotherStr. WATER QUALITY APPENDIX E REFERENCE MATERIAL APPENDIX F