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HomeMy WebLinkAboutDrainage Report 06-19-20W:\CalAtlantic Homes\2019-287-S Lennar- Legacy Townhomes\Design\Calcs\DrainRep\Report PDF's\DrainRep-2019-287.docx   STORMWATER DRAINAGE REPORT WINDWARD AT LEGACY DEVELOPER: Lennar Homes of Indiana, Inc. 9025 North River Road, Suite 100 Indianapolis, IN 46240 PREPARED BY: HWC Engineering 135 N. Pennsylvania Avenue, Suite 2800 Indianapolis, IN 46204 HWC #2019-287 June 19, 2020 TABLE OF CONTENTS   Stormwater Drainage Summary Appendix A Certificate of Liability Insurance Site Maps Appendix B Location Map USGS Topographic Map Floodplain Map Soils Map Wetlands Map Stormwater Calculations Appendix C Existing Basin Map Existing Basin CN Calculations Existing Basin TC Calculations Proposed Basin Map – Onsite Only Proposed Basin Map – With Offsite Master Plan Basins Proposed Onsite Basin CN Calculations ICPR Node Diagram ICPR Node Max Comparisons ICPR Basin Summaries ICPR Input Report Overall Post-Construction Stormwater Master Plan – Williams Creek Appendix D Overall Post-Developed Watersheds Exhibit Overall BMP Location Map Legacy PUD Stormwater Development Calculations Appendix E Legacy PUD Stormwater Development Checklist ICPR Predevelopment Runoff Volume Calculation Floodplain Storage Added Exhibit STORMWATER DRAINAGE SUMMARY Project: Windward at Legacy Location: Carmel, IN Introduction The project includes the construction of 142 townhomes, along with an entrance drive, alleys, sidewalks and a bike path on approximately 12 acres. This site is located ~750’ south of 146th Street and ~350’ west of Community Drive. Existing Conditions The existing site is an abandoned agricultural field. Stormwater runoff drains south towards two vegetated swales which act as both water quality treatment BMPs and dry detention ponds. An entrance drive stub, constructed with The Play School at Legacy daycare center, is located at the east end of the site. Adjoining Land Conditions North: Abandoned agricultural field South: Residential subdivision (The Grove at Legacy) East: The Play School at Legacy, Legacy Towns and Flats West: Residential subdivision (The Ridge at Legacy) Soil Types Soils maps from the United States Department of Agriculture, Soil Conservation Service identify Fox, Hennepin, Ockley, Sleeth, and Westland soils on the subject site. Fox (FnB2), Hennepin (HeF), Ockley (Oca, YoxA), and Westland (We) are is classified in hydrologic group B, while Sleeth (St) is classified in hydrologic group C. The split between group B and group C soils is approximately 99% B, 1% C for the site. Stormwater Detention The outlet for the overall site will be two (2) vegetates swales that are part of the Legacy Post- Construction Stormwater Master Plan, designed by Williams Creek. All runoff from the proposed site will drain south towards the proposed vegetates swales. An overall master detention design has been previously submitted and approved for The Legacy development. The Windward at Legacy project lies within two of the master plan delineated basins, BAS 122 and 129 (see master plan map in Appendix D). Both basins BAS 122 and BAS 129 have master planned CN values of 94. Calculations for the proposed site result in a weighted CN value of 90.2, so the project conforms to the original master plan design. Proposed ICPR model: In Appendix C, an ICPR model has been constructed for the two proposed ditches, east and west, along with their respective proposed watersheds. The onsite basins were broken out, along with the direct ditch watersheds (CN=70), and then the remainder of master plan basins BAS 122 and 129 were modeled with their master plan values of CN = 94, and time of concentration = 5 min. In this simulation, no tailwater from the White River was taken into account, this was an onsite only simulation to determine detention volumes provided. The peak 100-Year of the White River is 752.0, and all onsite buildings have been set to an elevation of at least 754.0 to provide a minimum freeboard of two (2) feet. Summary of ICPR model: Western ditch  Peak 100-YR elevation (no White River tailwater)  751.87 Western ditch  Storage Provided at 100-YR elevation  4.10 acre-feet Eastern ditch  Peak 100-YR elevation (no White River tailwater)  751.26 Eastern ditch  Storage Provided at 100-YR elevation  3.40 acre-feet Water Quality Stormwater quality is addressed in the Williams Creek Consulting master plan for The Legacy. Stormwater flowing south from the site into the proposed vegetates swale will be conveyed through proposed and existing vegetated swales and discharge in to the dry detention basin “DD6”. Because the proposed site does not include any uses with any excessive pollutants, no additional BMP’s are required. However, the proposed design includes inlets with 2’ sumps in the last structure of the run with right-of-way access to filter out larger debris before it enters the overall Legacy system. Stormwater Checklist The overall Legacy PUD design requires future developments to complete the “Legacy PUD Stormwater Development Checklist form. This form and the associated calculations have been provided in Appendix E. The checklist requires new developments to provide compensatory storage to account for 1.6 * the increase in runoff volume due to development, and then 3 * the volume of fill within the floodplain on the development site. Since this site is not located within the FEMA floodplain, no “fill in the floodplain” volume has been accounted for. The calculations are summarized below: 1.6 * increase in runoff volume 192,843 cf 3 * volume of fill in floodplain + 0 cf Total Compensatory Floodplain Storage Required 192,843 cf Total Compensatory Floodplain Storage Provided** 207,252 cf **See storage exhibit in Appendix E STORMWATER DRAINAGE SUMMARY                                                                         APPENDIX A SITE MAPS                                                                             APPENDIX B 0 1,000 2,000 3,000Graphic Scale (Feet) 1 inch = 2,000 feet Sources: Esri, HERE, DeLorme, USGS, Intermap, INCREMENT P,NRCan, Esri Japan, METI, Esri China (Hong Kong), Esri Korea, Esri(Thailand), MapmyIndia, NGCC, © OpenStreetMap contributors, and theGIS User Community Ê Legacy TownhomesAerial Location MapCarmel, IndianaDecember 2019 0 500 1,000 1,500Graphic Scale (Feet) 1 inch = 1,000 feet Copyright:© 2013 National Geographic Society, i-cubed Ê Legacy TownhomesUSGS Topographic Map Carmel, IndianaDecember 2019 Sources: IndianaMap, Indiana Spatial Data Portal and WebSoilSurvey 0 300 600 900Graphic Scale (Feet) 1 inch = 600 feet Source: Esri, Maxar, GeoEye, Earthstar Geographics, CNES/Airbus DS,USDA, USGS, AeroGRID, IGN, and the GIS User Community Ê Windward at LegacyFloodplain Map Carmel, IndianaJuly 2020 1% Annual Chance Flood Hazard Regulatory Floodway Special Floodway Area of Undetermined Flood Hazard 0.2% Annual Chance Flood Hazard Future Conditions 1% Annual Chance Flood Hazard Area with Reduced Risk Due to Levee We OcA MmA St St OcA Pa HeF FxC3 FnB2 OcA We FxC3 OcA St OcB2 OcB2 St MmB2 We St FxC3 MmA OcB2 FxC3 OcA FxC3 FnB2OcB2 MmB2 OcA We Carmel Noblesville Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics,CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS UserCommunity 0 250 500 750Graphic Scale (Feet) 1 inch = 500 feet Ê Legacy TownhomesSoils Map and LegendCarmel, IndianaDecember 2019 Sources: IndianaMap, Indiana Spatial Data Portal and WebSoilSurvey Legend Project Area Corporate Limits Sources: IndianaMap, Indiana Spatial Data Portal and WebSoilSurvey S y mb ol N ameFnB2Fox loam, 2 to 6 percent slopes, erodedOcAOckley silt loam, 0 to 2 percent slopesStSleeth loam, 0 to 2 percent slopesWeWestland silty clay loam, 0 to 2 percent slopes 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 phases. A final number of 2 indicates that the soil is moderately eroded, and a number 3 indicates that the soil is severely eroded. 0 400 800 1,200Graphic Scale (Feet) 1 inch = 800 feet E 146T H ST RIVER RDCHERRY TREE RDBRAEMAR AVECOMMUNITY DRC O FF I N D RPENNAN C TARNETT DRBLADSTONE RDDORSET DRHO PE W E L L P KY H AV E R T O N W AYMISSISSINEWA DRGRAYLAN PLMACDUFF DR HAW KS B URY DR J A M E S D E A N D R SETTLERS RIDGE TRL TRUEBLOOD LNINTEGRITY CTSOURWOOD LNA L I C E PA U L L N T E S T I M O N Y A V E ARCADIAN CIRALNWICK LNVESTAL CTPECOS CTSMICKLE LNBEALLSVILLE DRJ O H N D IC K I N S O N D R SPAY S I D E D R DOVETREE CTALD ER CTBRAEMAR AVE Source: USFWS, Source: Esri, DigitalGlobe, GeoEye, EarthstarGeographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and theGIS User Community Ê Legacy TownhomesWetlands Area Map Carmel, IndianaDecember 2019 Estuarine and Ma rine Wetland Freshwater Eme rg ent We tla nd Freshwater Fo re sted/Shrub Wetland Freshwater Pond Lake Oth er Riverine STORMWATER CALCULATIONS                                                                             APPENDIX C Legacy Townhomes HWC # 2019-287 Date: 7/14/2020 Existing Drainage Basins Curve Numbers: BC D Pasture/Grassland 69 79 84 Wooded 55 70 77 Row Crops 64 75 82 1/8 Acre Lot 85 90 92 Roof/Pvmt 98 98 98 Notes: CN Values based on 99% soil group B, 1% soil group C Area Pasture/Grassland Wooded Row Crops 1/8 Acre Lot Roof/Pvmt Weighted (acres) (acres) (acres) (acres) (acres) (acres) CN EX 12.00 7.22 4.78 0.00 0.00 0.00 63.5 Basin W:\CalAtlantic Homes\2019-287-S Lennar- Legacy Townhomes\Design\Calcs\2019-287-ICPR.xlsx 7/14/2020 1:22 PM Time of Concentration WorksheetPROJECT: Legacy Townhomes Based on TR-55JOB #: 2019-287Overland Flow Channel Flow short grass 0.15 grass 0.03 farm, > 20% cover 0.17 concrete 0.015 2 year, 24 hour rainfall = 2.90 inches dense grass 0.24 rip-rap 0.035minimum T_c = 5.00 minutes pavement 0.011 Overland flowseg. 1 Overland flowseg. 2 Shallow Concentrated Flow Channel Flow T_cBasin Length S n T_t Length S n T_t Length S Paved/Un Vel. T_t Length a Pw r S n Vel. T_tname (ft) % (min) (ft) % (min) (ft) % (P or U) (ft/s) (min) (ft) (s.f.) (ft) (ft) % (ft/s) (min) (min)Typical values for Manning's n6/1/20W:\CalAtlantic Homes\2019-287-S Lennar- Legacy Townhomes\Design\Calcs\[2019-287-ST.xlsx]TCEX 100 1.00 0.24 20 615 0.30 U 0.88 1231 ONSITE-WEST7.49 AC.CN=90.3TC=21ONSITE-EAST4.51 AC.CN=90.1TC=183940414243L.C.A..#7109110111112113114115116117118119120121122123124125126G.C.A..#120'(IN FEET)GRAPHIC SCALE50'100'150'WINDWARD AT LEGACYPROPOSED BASIN MAPCARMEL, INDIANAJULY 14, 2020ONSITE BASINS ONLY ONSITE-WEST7.49 AC.CN=90.3TC=21ONSITE-EAST4.51 AC.CN=90.1TC=183940414243L.C.A..#7109110111112113114115116117118119120121122123124125126G.C.A..#12 DITCH-WEST1.77 AC.CN=70TC=5DITCH-EAST1.94 AC.CN=70TC=5BAS 129-NORTH13.66 AC.CN=94**TC=5 ****ASSUMED PERMASTER PLANBAS 122-NORTH19.63 AC.CN=94**TC=5 ****ASSUMED PERMASTER PLANBAS 129-SOUTH2.95 AC.CN=94**TC=5 ****ASSUMED PERMASTER PLANBAS 122-SOUTH3.06 AC.CN=94**TC=5 ****ASSUMED PERMASTER PLAN0'(IN FEET)GRAPHIC SCALE75'150'225'WINDWARD AT LEGACYPROPOSED BASIN MAPCARMEL, INDIANAJULY 14, 2020WITH DITCH MASTERPLAN OFFSITE BASINSORIGINAL MASTERPLANBASIN AREAS:BASIN 129 = 26.2 AC.BASIN 122 = 29.4 AC.TOTAL = 55.6 AC.CURRENT PLAN BASINAREAS:ONSITE = 12.0 AC.OFFSITE = 43.01 AC.TOTAL = 55.01 AC. Legacy Townhomes HWC # 2019-287 Date: 7/14/2020 Proposed Drainage Basins Curve Numbers: BC D Pasture/Grassland 69 79 84 Wooded 55 70 77 Row Crops 64 75 82 1/8 Acre Lot 85 90 92 Roof/Pvmt 98 98 98 Notes: CN Values based on 99% soil group C, 1% soil group D Area Pasture/Grassland Wooded Row Crops 1/8 Acre Lot Roof/Pvmt Weighted (acres) (acres) (acres) (acres) (acres) (acres) CN ONSITE-WEST 7.49 3.05 4.44 90.3 ONSITE-EAST 4.51 1.89 2.62 90.1 Basin W:\CalAtlantic Homes\2019-287-S Lennar- Legacy Townhomes\Design\Calcs\2019-287-ICPR 7/14/2020 2:18 PM Interconnected Channel and Pond Routing Model (ICPR) ©2002 Streamline Technologies, Inc.Windward at LegacyProposed Conditions ICPR Node DiagramNodesA Stage/AreaV Stage/VolumeT Time/StageM ManholeBasinsO Overland FlowU SCS Unit CNS SBUH CNY SCS Unit GAZ SBUH GALinksP PipeW WeirC ChannelD Drop StructureB BridgeR Rating CurveH BreachE PercolationF FilterX Exfil TrenchA:DITCH-WESTU:ONSITE-WESTU:BASIN 129-NORTHU:DITCH-WESTU:BASIN 129-SOUTHA:DITCH-EASTU:ONSITE-EASTU:BASIN 122-NORTHU:DITCH-EASTU:BAS 122-SOUTHA:CULVERT DOWNT:BNDYP:676-PP:EX-42C:CHANNEL-1 Windward at LegacyProposed Conditions - No White River TailwaterICPR Node Max Comparisons 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 BNDY BASE 002YR-24HR 0.00 745.00 745.00 0.0000 37 12.10 46.35 0.00 0.00 BNDY BASE 010YR-24HR 0.00 745.00 745.00 0.0000 37 12.13 68.08 0.00 0.00 BNDY BASE 100YR-24HR 0.00 745.00 745.00 0.0000 37 12.26 95.42 0.00 0.00 CULVERT DOWN BASE 002YR-24HR 12.10 747.08 753.00 0.0050 2619 12.08 46.39 12.10 46.35 CULVERT DOWN BASE 010YR-24HR 12.13 747.46 753.00 0.0050 2899 12.12 68.09 12.13 68.08 CULVERT DOWN BASE 100YR-24HR 12.26 747.84 753.00 0.0049 3209 12.25 95.43 12.26 95.42 DITCH-EAST BASE 002YR-24HR 12.08 748.25 752.00 0.0050 27723 11.78 91.35 12.08 46.39 DITCH-EAST BASE 010YR-24HR 12.12 749.34 752.00 0.0050 33334 11.78 143.75 12.12 68.09 DITCH-EAST BASE 100YR-24HR 12.25 751.26 752.00 0.0050 43298 11.78 262.92 12.25 95.43 DITCH-WEST BASE 002YR-24HR 12.25 749.31 752.00 -0.0030 45178 11.78 62.14 12.24 19.78 DITCH-WEST BASE 010YR-24HR 12.22 749.92 752.00 -0.0027 47979 11.78 98.34 12.22 31.60 DITCH-WEST BASE 100YR-24HR 12.30 751.87 752.00 -0.0049 56899 11.78 180.15 12.62 57.38Interconnected Channel and Pond Routing Model (ICPR) ©2002 Streamline Technologies, Inc.Page 1 of 1 Windward at Legacy Proposed Conditions ICPR Basin Summaries Name: BAS 122-SOUTH BASIN 122-NORTH BASIN 129-NORTH BASIN 129-SOUTH DITCH-EAST Group: BASE BASE BASE BASE BASE Simulation: 002YR-24HR 002YR-24HR 002YR-24HR 002YR-24HR 002YR-24HR Node: DITCH-EAST DITCH-EAST DITCH-WEST DITCH-WEST DITCH-EAST Type: SCS SCS SCS SCS SCS Unit Hydrograph: Uh484 Uh484 Uh484 Uh484 Uh484 Peaking Factor: 484.0 484.0 484.0 484.0 484.0 Spec Time Inc(min): 0.67 0.67 0.67 0.67 0.67 Comp Time Inc(min): 0.67 0.67 0.67 0.67 0.67 Rain File: NRCS-II Carmel NRCS-II Carmel NRCS-II Carmel NRCS-II Carmel NRCS-II Carmel Rain Amount(in): 2.660 2.660 2.660 2.660 2.660 Duration(hrs): 24.00 24.00 24.00 24.00 24.00 Status: Onsite Onsite Onsite Onsite Onsite TC(min): 5.00 5.00 5.00 5.00 5.00 Time Shift(hrs): 0.00 0.00 0.00 0.00 0.00 Area(ac): 3.060 19.630 13.660 2.950 1.940 Vol of Unit Hyd(in): 1.001 1.000 1.000 1.000 1.000 Curve Num: 94.000 94.000 94.000 94.000 70.000 DCIA(%): 0.000 0.000 0.000 0.000 0.000 Time Max(hrs): 11.78 11.78 11.78 11.78 11.80 Flow Max(cfs): 10.43 66.88 46.54 10.05 1.01 Runoff Volume(in): 2.020 2.020 2.020 2.020 0.533 Runoff Volume(ft3): 22436 143928 100155 21629 3754 Name: DITCH-WEST ONSITE-EAST ONSITE-WEST BAS 122-SOUTH BASIN 122-NORTH Group: BASE BASE BASE BASE BASE Simulation: 002YR-24HR 002YR-24HR 002YR-24HR 010YR-24HR 010YR-24HR Node: DITCH-WEST DITCH-EAST DITCH-WEST DITCH-EAST DITCH-EAST Type: SCS SCS SCS SCS SCS Unit Hydrograph: Uh484 Uh484 Uh484 Uh484 Uh484 Peaking Factor: 484.0 484.0 484.0 484.0 484.0 Spec Time Inc(min): 0.67 2.40 2.80 0.67 0.67 Comp Time Inc(min): 0.67 2.40 2.80 0.67 0.67 Rain File: NRCS-II Carmel NRCS-II Carmel NRCS-II Carmel NRCS-II Carmel NRCS-II Carmel Rain Amount(in): 2.660 2.660 2.660 3.830 3.830 Duration(hrs): 24.00 24.00 24.00 24.00 24.00 Status: Onsite Onsite Onsite Onsite Onsite TC(min): 5.00 18.00 21.00 5.00 5.00 Time Shift(hrs): 0.00 0.00 0.00 0.00 0.00 Area(ac): 1.770 4.510 7.490 3.060 19.630 Vol of Unit Hyd(in): 1.000 1.000 1.000 1.001 1.000 Curve Num: 70.000 90.100 90.300 94.000 94.000 DCIA(%): 0.000 0.000 0.000 0.000 0.000 Time Max(hrs): 11.80 11.96 11.99 11.78 11.78 Flow Max(cfs): 0.92 6.98 10.98 16.11 103.32 Runoff Volume(in): 0.533 1.680 1.696 3.154 3.154 Runoff Volume(ft3): 3425 27510 46120 35031 224722 Name: BASIN 129-NORTH BASIN 129-SOUTH DITCH-EAST DITCH-WEST ONSITE-EAST Group: BASE BASE BASE BASE BASE Simulation: 010YR-24HR 010YR-24HR 010YR-24HR 010YR-24HR 010YR-24HR Node: DITCH-WEST DITCH-WEST DITCH-EAST DITCH-WEST DITCH-EAST Type: SCS SCS SCS SCS SCS Unit Hydrograph: Uh484 Uh484 Uh484 Uh484 Uh484 Peaking Factor: 484.0 484.0 484.0 484.0 484.0 Spec Time Inc(min): 0.67 0.67 0.67 0.67 2.40 Comp Time Inc(min): 0.67 0.67 0.67 0.67 2.40 Rain File: NRCS-II Carmel NRCS-II Carmel NRCS-II Carmel NRCS-II Carmel NRCS-II Carmel Rain Amount(in): 3.830 3.830 3.830 3.830 3.830 Duration(hrs): 24.00 24.00 24.00 24.00 24.00 Status: Onsite Onsite Onsite Onsite Onsite TC(min): 5.00 5.00 5.00 5.00 18.00 Time Shift(hrs): 0.00 0.00 0.00 0.00 0.00 Area(ac): 13.660 2.950 1.940 1.770 4.510 Vol of Unit Hyd(in): 1.000 1.000 1.000 1.000 1.000 Curve Num: 94.000 94.000 70.000 70.000 90.100 DCIA(%): 0.000 0.000 0.000 0.000 0.000 Time Max(hrs): 11.78 11.78 11.79 11.79 11.96 Flow Max(cfs): 71.90 15.53 3.28 2.99 11.49 Runoff Volume(in): 3.154 3.154 1.216 1.216 2.764 Runoff Volume(ft3): 156378 33771 8563 7813 45253 Name: ONSITE-WEST BAS 122-SOUTH BASIN 122-NORTH BASIN 129-NORTH BASIN 129-SOUTH Group: BASE BASE BASE BASE BASE Simulation: 010YR-24HR 100YR-24HR 100YR-24HR 100YR-24HR 100YR-24HR Node: DITCH-WEST DITCH-EAST DITCH-EAST DITCH-WEST DITCH-WEST Type: SCS SCS SCS SCS SCS Unit Hydrograph: Uh484 Uh484 Uh484 Uh484 Uh484 Peaking Factor: 484.0 484.0 484.0 484.0 484.0 Spec Time Inc(min): 2.80 0.67 0.67 0.67 0.67 Comp Time Inc(min): 2.80 0.67 0.67 0.67 0.67 Rain File: NRCS-II Carmel NRCS-II Carmel NRCS-II Carmel NRCS-II Carmel NRCS-II Carmel Rain Amount(in): 3.830 6.460 6.460 6.460 6.460 Duration(hrs): 24.00 24.00 24.00 24.00 24.00 Interconnected Channel and Pond Routing Model (ICPR) ©2002 Streamline Technologies, Inc.Page 1 of 2 Windward at Legacy Proposed Conditions ICPR Basin Summaries Status: Onsite Onsite Onsite Onsite Onsite TC(min): 21.00 5.00 5.00 5.00 5.00 Time Shift(hrs): 0.00 0.00 0.00 0.00 0.00 Area(ac): 7.490 3.060 19.630 13.660 2.950 Vol of Unit Hyd(in): 1.000 1.001 1.000 1.000 1.000 Curve Num: 90.300 94.000 94.000 94.000 94.000 DCIA(%): 0.000 0.000 0.000 0.000 0.000 Time Max(hrs): 11.99 11.78 11.78 11.78 11.78 Flow Max(cfs): 18.00 28.67 183.94 128.00 27.64 Runoff Volume(in): 2.783 5.745 5.745 5.745 5.745 Runoff Volume(ft3): 75664 63812 409358 284861 61518 Name: DITCH-EAST DITCH-WEST ONSITE-EAST ONSITE-WEST Group: BASE BASE BASE BASE Simulation: 100YR-24HR 100YR-24HR 100YR-24HR 100YR-24HR Node: DITCH-EAST DITCH-WEST DITCH-EAST DITCH-WEST Type: SCS SCS SCS SCS Unit Hydrograph: Uh484 Uh484 Uh484 Uh484 Peaking Factor: 484.0 484.0 484.0 484.0 Spec Time Inc(min): 0.67 0.67 2.40 2.80 Comp Time Inc(min): 0.67 0.67 2.40 2.80 Rain File: NRCS-II Carmel NRCS-II Carmel NRCS-II Carmel NRCS-II Carmel Rain Amount(in): 6.460 6.460 6.460 6.460 Duration(hrs): 24.00 24.00 24.00 24.00 Status: Onsite Onsite Onsite Onsite TC(min): 5.00 5.00 18.00 21.00 Time Shift(hrs): 0.00 0.00 0.00 0.00 Area(ac): 1.940 1.770 4.510 7.490 Vol of Unit Hyd(in): 1.000 1.000 1.000 1.000 Curve Num: 70.000 70.000 90.100 90.300 DCIA(%): 0.000 0.000 0.000 0.000 Time Max(hrs): 11.79 11.79 11.92 11.99 Flow Max(cfs): 9.91 9.04 21.76 33.78 Runoff Volume(in): 3.170 3.170 5.299 5.321 Runoff Volume(ft3): 22326 20370 86750 144666 Interconnected Channel and Pond Routing Model (ICPR) ©2002 Streamline Technologies, Inc.Page 2 of 2 Windward at Legacy Proposed Conditions ICPR Input Report ========================================================================================== ==== Basins ============================================================================== ========================================================================================== Name: BAS 122-SOUTH Node: DITCH-EAST Status: Onsite Group: BASE 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): 5.00 Area(ac): 3.060 Time Shift(hrs): 0.00 Curve Number: 94.00 Max Allowable Q(cfs): 999999.000 DCIA(%): 0.00 ---------------------------------------------------------------------------------------------------- Name: BASIN 122-NORTH Node: DITCH-EAST Status: Onsite Group: BASE 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): 5.00 Area(ac): 19.630 Time Shift(hrs): 0.00 Curve Number: 94.00 Max Allowable Q(cfs): 999999.000 DCIA(%): 0.00 ---------------------------------------------------------------------------------------------------- Name: BASIN 129-NORTH Node: DITCH-WEST Status: Onsite Group: BASE 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): 5.00 Area(ac): 13.660 Time Shift(hrs): 0.00 Curve Number: 94.00 Max Allowable Q(cfs): 999999.000 DCIA(%): 0.00 ---------------------------------------------------------------------------------------------------- Name: BASIN 129-SOUTH Node: DITCH-WEST Status: Onsite Group: BASE 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): 5.00 Area(ac): 2.950 Time Shift(hrs): 0.00 Curve Number: 94.00 Max Allowable Q(cfs): 999999.000 DCIA(%): 0.00 ---------------------------------------------------------------------------------------------------- Name: DITCH-EAST Node: DITCH-EAST Status: Onsite Group: BASE 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): 5.00 Area(ac): 1.940 Time Shift(hrs): 0.00 Curve Number: 70.00 Max Allowable Q(cfs): 999999.000 DCIA(%): 0.00 ---------------------------------------------------------------------------------------------------- Name: DITCH-WEST Node: DITCH-WEST Status: Onsite Group: BASE 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): 5.00 Area(ac): 1.770 Time Shift(hrs): 0.00 Curve Number: 70.00 Max Allowable Q(cfs): 999999.000 DCIA(%): 0.00 ---------------------------------------------------------------------------------------------------- Name: ONSITE-EAST Node: DITCH-EAST Status: Onsite Group: BASE Type: SCS Unit Hydrograph CN Unit Hydrograph: Uh484 Peaking Factor: 484.0 Interconnected Channel and Pond Routing Model (ICPR) ©2002 Streamline Technologies, Inc.Page 1 of 5 Windward at Legacy Proposed Conditions ICPR Input Report Rainfall File: Storm Duration(hrs): 0.00 Rainfall Amount(in): 0.000 Time of Conc(min): 18.00 Area(ac): 4.510 Time Shift(hrs): 0.00 Curve Number: 90.10 Max Allowable Q(cfs): 999999.000 DCIA(%): 0.00 ---------------------------------------------------------------------------------------------------- Name: ONSITE-WEST Node: DITCH-WEST Status: Onsite Group: BASE 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): 21.00 Area(ac): 7.490 Time Shift(hrs): 0.00 Curve Number: 90.30 Max Allowable Q(cfs): 999999.000 DCIA(%): 0.00 ========================================================================================== ==== Nodes =============================================================================== ========================================================================================== Name: BNDY Base Flow(cfs): 0.000 Init Stage(ft): 745.000 Group: BASE Warn Stage(ft): 745.000 Type: Time/Stage Model boundary @ Existing Detention Area Time(hrs) Stage(ft) --------------- --------------- 0.00 745.000 99.00 745.000 ------------------------------------------------------------------------------------------ Name: CULVERT DOWN Base Flow(cfs): 0.000 Init Stage(ft): 744.800 Group: BASE Warn Stage(ft): 753.000 Type: Stage/Area Downstream face of existing 42" RCP culvert Stage(ft) Area(ac) --------------- --------------- ------------------------------------------------------------------------------------------ Name: DITCH-EAST Base Flow(cfs): 0.000 Init Stage(ft): 745.000 Group: BASE Warn Stage(ft): 752.000 Type: Stage/Area Eastern Ditch Stage(ft) Area(ac) --------------- --------------- 745.000 0.0100 745.500 0.0630 746.000 0.1400 747.000 0.4000 748.000 0.6000 749.000 0.7200 750.000 0.8400 751.000 0.9600 752.000 1.0900 ------------------------------------------------------------------------------------------ Name: DITCH-WEST Base Flow(cfs): 0.000 Init Stage(ft): 747.400 Group: BASE Warn Stage(ft): 752.000 Type: Stage/Area Western Ditch Stage(ft) Area(ac) --------------- --------------- 747.400 0.0100 747.600 0.1150 747.800 0.2440 748.000 0.3850 749.000 1.0000 750.000 1.1050 751.000 1.2100 752.000 1.3200 ========================================================================================== ==== Pipes =============================================================================== ========================================================================================== Interconnected Channel and Pond Routing Model (ICPR) ©2002 Streamline Technologies, Inc.Page 2 of 5 Windward at Legacy Proposed Conditions ICPR Input Report Name: 676-P From Node: DITCH-WEST Length(ft): 123.00 Group: BASE To Node: DITCH-EAST Count: 1 Friction Equation: Automatic UPSTREAM DOWNSTREAM Solution Algorithm: Most Restrictive Geometry: Circular Circular Flow: Both Span(in): 42.00 42.00 Entrance Loss Coef: 0.50 Rise(in): 42.00 42.00 Exit Loss Coef: 0.00 Invert(ft): 747.400 747.150 Bend Loss Coef: 0.00 Manning's N: 0.013000 0.013000 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 Proposed Culvert Under James Dean Drive ---------------------------------------------------------------------------------------------------- Name: EX-42 From Node: DITCH-EAST Length(ft): 127.00 Group: BASE To Node: CULVERT DOWN Count: 1 Friction Equation: Automatic UPSTREAM DOWNSTREAM Solution Algorithm: Most Restrictive Geometry: Circular Circular Flow: Both Span(in): 42.00 42.00 Entrance Loss Coef: 0.50 Rise(in): 42.00 42.00 Exit Loss Coef: 0.00 Invert(ft): 745.000 744.800 Bend Loss Coef: 0.00 Manning's N: 0.013000 0.013000 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 Existing 42" RCP Culvert Under Community Drive ========================================================================================== ==== Channels ============================================================================ ========================================================================================== Name: CHANNEL-1 From Node: CULVERT DOWN Length(ft): 292.00 Group: BASE To Node: BNDY Count: 1 UPSTREAM DOWNSTREAM Friction Equation: Automatic Geometry: Trapezoidal Trapezoidal Solution Algorithm: Automatic Invert(ft): 744.800 745.000 Flow: Both TClpInitZ(ft): 9999.000 9999.000 Contraction Coef: 0.100 Manning's N: 0.035000 0.035000 Expansion Coef: 0.300 Top Clip(ft): 0.000 0.000 Entrance Loss Coef: 0.000 Bot Clip(ft): 0.000 0.000 Exit Loss Coef: 0.000 Main XSec: Outlet Ctrl Spec: Use dc or tw AuxElev1(ft): Inlet Ctrl Spec: Use dc Aux XSec1: Stabilizer Option: None AuxElev2(ft): Aux XSec2: Top Width(ft): Depth(ft): Bot Width(ft): 5.000 5.000 LtSdSlp(h/v): 3.00 3.00 RtSdSlp(h/v): 3.00 3.00 Existing ditch east of Community Drive to detention area ========================================================================================== ==== Weirs =============================================================================== ========================================================================================== Name: From Node: Group: BASE To Node: Flow: Both Count: 1 Type: Horizontal Geometry: Circular Span(in): 0.00 Rise(in): 0.00 Invert(ft): 0.000 Control Elevation(ft): 0.000 TABLE Bottom Clip(in): 0.000 Interconnected Channel and Pond Routing Model (ICPR) ©2002 Streamline Technologies, Inc.Page 3 of 5 Windward at Legacy Proposed Conditions ICPR Input Report Top Clip(in): 0.000 Weir Discharge Coef: 3.200 Orifice Discharge Coef: 0.600 ========================================================================================== ==== Hydrology Simulations =============================================================== ========================================================================================== Name: 002YR-24HR Filename: W:\CalAtlantic Homes\2019-287-S Lennar- Legacy Townhomes\Design\Calcs\ICPR\002YR-24HR.R32 Override Defaults: Yes Storm Duration(hrs): 24.00 Rainfall File: NRCS-II Carmel Rainfall Amount(in): 2.66 Time(hrs) Print Inc(min) --------------- --------------- 36.000 1.00 ---------------------------------------------------------------------------------------------------- Name: 010YR-24HR Filename: W:\CalAtlantic Homes\2019-287-S Lennar- Legacy Townhomes\Design\Calcs\ICPR\010YR-24HR.R32 Override Defaults: Yes Storm Duration(hrs): 24.00 Rainfall File: NRCS-II Carmel Rainfall Amount(in): 3.83 Time(hrs) Print Inc(min) --------------- --------------- 36.000 1.00 ---------------------------------------------------------------------------------------------------- Name: 100YR-24HR Filename: W:\CalAtlantic Homes\2019-287-S Lennar- Legacy Townhomes\Design\Calcs\ICPR\100YR-24HR.R32 Override Defaults: Yes Storm Duration(hrs): 24.00 Rainfall File: NRCS-II Carmel Rainfall Amount(in): 6.46 Time(hrs) Print Inc(min) --------------- --------------- 36.000 1.00 ========================================================================================== ==== Routing Simulations ================================================================= ========================================================================================== Name: 002YR-24HR Hydrology Sim: 002YR-24HR Filename: W:\CalAtlantic Homes\2019-287-S Lennar- Legacy Townhomes\Design\Calcs\ICPR\002YR-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): 36.00 Min Calc Time(sec): 0.5000 Max Calc Time(sec): 60.0000 Boundary Stages: Boundary Flows: Time(hrs) Print Inc(min) --------------- --------------- 36.000 5.000 Group Run --------------- ----- BASE Yes ---------------------------------------------------------------------------------------------------- Name: 010YR-24HR Hydrology Sim: 010YR-24HR Filename: W:\CalAtlantic Homes\2019-287-S Lennar- Legacy Townhomes\Design\Calcs\ICPR\010YR-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): 36.00 Min Calc Time(sec): 0.5000 Max Calc Time(sec): 60.0000 Boundary Stages: Boundary Flows: Interconnected Channel and Pond Routing Model (ICPR) ©2002 Streamline Technologies, Inc.Page 4 of 5 Windward at Legacy Proposed Conditions ICPR Input Report Time(hrs) Print Inc(min) --------------- --------------- 36.000 5.000 Group Run --------------- ----- BASE Yes ---------------------------------------------------------------------------------------------------- Name: 100YR-24HR Hydrology Sim: 100YR-24HR Filename: W:\CalAtlantic Homes\2019-287-S Lennar- Legacy Townhomes\Design\Calcs\ICPR\100YR-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): 36.00 Min Calc Time(sec): 0.5000 Max Calc Time(sec): 60.0000 Boundary Stages: Boundary Flows: Time(hrs) Print Inc(min) --------------- --------------- 36.000 5.000 Group Run --------------- ----- BASE Yes Interconnected Channel and Pond Routing Model (ICPR) ©2002 Streamline Technologies, Inc.Page 5 of 5 OVERALL POST-CONSTRUCTION STORMWATER MASTER PLAN Prepared by Williams Creek Consulting                                                                   APPENDIX D LEGACY PUD STORMWATER DEVELOPMENT CALCULATIONS APPENDIX E Windward at Legacy Lennar Homes of Indiana, Inc. 9025 North River Rd. Ste. 100, Indianapolis, IN 46240 135 N. Pennsylvania St., Ste. 2800, Indianapolis, IN 46204 Bas 122 vs. Onsite East 94 5 Bas 129 vs. Onsite West 94 5 90.1 90.3 21 18 110,889 231,416 120,527 192,843 192,843 192,843 0 0 (not located in FEMA floodplain) HWC Engineering, Kyle Eichhorn, P.E. Windward at Legacy Existing Conditions - Pre-developed Runoff ICPR Basin Summary Name: BAS EX BAS EX BAS EX Group: BASE BASE BASE Simulation: 002YR-24HR 010YR-24HR 100YR-24HR Node: EX-BNDY EX-BNDY EX-BNDY Type: SCS SCS SCS Unit Hydrograph: Uh484 Uh484 Uh484 Peaking Factor: 484.0 484.0 484.0 Spec Time Inc(min): 4.13 4.13 4.13 Comp Time Inc(min): 4.13 4.13 4.13 Rain File: NRCS-II Carmel NRCS-II Carmel NRCS-II Carmel Rain Amount(in): 2.660 3.830 6.460 Duration(hrs): 24.00 24.00 24.00 Status: Onsite Onsite Onsite TC(min): 31.00 31.00 31.00 Time Shift(hrs): 0.00 0.00 0.00 Area(ac): 12.000 12.000 12.000 Vol of Unit Hyd(in): 1.001 1.001 1.001 Curve Num: 63.500 63.500 63.500 DCIA(%): 0.000 0.000 0.000 Time Max(hrs): 12.33 12.26 12.19 Flow Max(cfs): 1.65 5.99 21.22 Runoff Volume(in): 0.314 0.851 2.546 Runoff Volume(ft3): 13663 37062 110889 Interconnected Channel and Pond Routing Model (ICPR) ©2002 Streamline Technologies, Inc.Page 1 of 1 3940414243L.C.A..#7109110111112113114115116117118119120121122123124125126G.C.A..#12 L.C.A..#5 )))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ))))))))))))))))))))) )))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))0'(IN FEET)GRAPHIC SCALE50'100'150'WINDWARD AT LEGACYSTORAGE ADDED EXHIBITCARMEL, INJUNE 22, 2020TOTAL STORAGE ADDED BELOW ELEVATION 752.00 = 7,676 CUBIC YARDS OR 207,252 CUBIC FEET