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Home My WebLink AboutDrainage ReportRobbins Subdivision 11400 Wesƞield Boulevard Carmel, IN 46032 Stormwater Water Technical Report 2323-APR-2024 Developer: Kevin Silvius 40 E Bloomfield Lane Wesƞield, IN 46074 SubmiƩed By: William A. Cash 212 Redwood Circle Noblesville, IN 46062 Index: 1. NarraƟve 2. Drainage CalculaƟons 3. Summary Report 4. Hydraulic/Hydrologic Analysis Appendices: I. ExisƟng Basin Map II. Developed Basin Map III. Soils Map IV. 10 Yr Design Input/Output V. 100 Yr Pond Design Input/Output 1 of 68 NarraƟve The Robbins Family plans to subdivide their 4.58 acre property located at 11400 Wesƞield Boulevard and construct three new single family residenƟal homes. The three new homes will be located east of the exisƟng homes and accessed by a common drive. ExisƟng impervious surfaces include a residence, barn and paved areas. The proposed development is on a site located within Clay Township, Hamilton County, Indiana. The site is generally located in SecƟon 1, Township 17 North, and Range 3 East, Hamilton County Indiana. The site will discharge by overland flow and drain directly into an onsite stormwater management area located in the southeast corner of the property. The project will replace an exisƟng residenƟal driveway culvert. AddiƟonally, separate SSD lines extend to the three building pads and are intended to collect roof drainage and convey the flow directly to the stormwater management area. The stormwater management area acts as both a natural BMP and detenƟon pond. The new stormwater management area will be equipped with an outlet control structure and outlet pipe which will drain to Wesƞield Boulevard right-of-way. Stormwater quality best management pracƟces for this property include grass swales, infiltraƟon trench and a “sumped” outlet control structure. Drainage CalculaƟons The presented calculaƟons include TR-20 based computaƟons using SCS Type II 24 Hour Rainfall DistribuƟons. The design incorporates rainfall depth values for the 10 yr and 100 yr storms as presented in the current City of Carmel Stormwater Technical Standards Table 201-3, page 200- 6. Time of concentraƟon values were esƟmated and follow NRCS TR-55 methodology. Summary Report The Robbins family plans to divide the original 4.58 +/- acre property for the purpose of creaƟng 3 addiƟonal parcels for immediate family members. The majority of the 4.58 acres drain east and south through a driveway culvert located near Wesƞield Boulevard. Offsite area to the north and right-of-way area also drains through the 12” CMP drive culvert. The 4.68 acres draining through the culvert consists of low-density residenƟal properƟes and half the Wesƞield Boulevard Right-of-Way. There are no know drainage issues impacƟng the project site. The City of Carmel general release rates, i.e., 0.1 cfs/acre and 0.3 cfs/acre were used to determine the required pond storage volume for the 10 yr and 100 yr storm events, respecƟvely. The design orifice diameters and invert elevaƟons pertain to the pond volume required to detain the runoff volume resulƟng from the 1.26 acres of disturbed area. The offsite low density drainage areas were also routed through the pond along with the 1.26 acre onsite area. The pond emergency weir outlet was set at the 100 year elevaƟon based on the combined onsite 1.26 acre and 3.01 acre offsite runoff and sized for 1.25x the peak combined inflow to the pond. 2 of 68 The project will involve an area disturbance exceeding one acre therefore in addiƟon to the City of Carmel drainage permit the developer shall submit for approval under the Indiana ConstrucƟon Stormwater General Permit. The project does not require any other State or Federal Stormwater permits. The property remains clear of any FEMA recognized flood hazard areas. The dry detenƟon pond shall include naƟve planƟngs and an infiltraƟon trench which shall funcƟon to remove stormwater contaminants similar to a vegetaƟve swale. Hydraulic/Hydrologic Analysis The onsite runoff was routed to determine the low flow and high flow orifice sizes and elevations. The top of the main outlet control structure was set at the design onsite 100 yr elevation. A compound weir was placed through the pond bank with the invert matching the 100 yr onsite design elevation. The compound weir consists of a concrete curb with a 8.5x6.5 in notch. The onsite and offsite flow was routed through the pond to determine the emergency overflow weir invert elevation of 818.25. The following table summarizes the dry detenƟon pond performance for the 10 yr and 100 yr design storms. Onsite Only – DetenƟon Volume Requirement Design Storm Peak Runoff Peak Stage Allowable Release Rate Peak Discharge 10 Yr 2.47 cfs 816.93 0.13 cfs 100Yr 5.10 cfs 817.70 0.355 cfs 0.13 cfs (pg 15) 0.35 cfs (pg 27)(s Onsite + Offsite – DetenƟon Pond Performance Design Storm Qp Onsite Qp Offsite Peak Stage Peak Discharge 10 Yr 2.47 cfs 4.55 817.90 100Yr 5.10 cfs 9.41 818.25 2.49 cfs (pg 39) 7.50 cfs (pg 51) (see page 51) 3 of 68 EXISTING BASIN MAP 4 of 68 EXISTING BASIN TO DRIVE CULVERT AREA = 4.68 AC 5 of 68 DEVELOPED BASIN MAP 6 of 68 OFFSITE BASIN TO POND AREA = 1.03 AC OFFSITE BASIN TO POND AREA = 1.98 AC ONSITE BASIN TO POND AREA = 1.26 AC OFFSITE BASIN TO DRIVECULVERT AREA = 0.41 AC7 of 68 SOILS MAP 8 of 68 Soil Map—Hamilton County, Indiana (11400 Westfield Boulevard Soils Map) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey4422810442284044228704422900442293044229604422990 4422810442284044228704422900442293044229604422990574330 574360 574390 574420 574450 574480 574510 574540 574570 574600 574330 574360 574390 574420 574450 574480 574510 574540 574570 574600 39° 57' 13'' N 86° 7' 47'' W39° 57' 13'' N86° 7' 35'' W39° 57' 7'' N 86° 7' 47'' W39° 57' 7'' N 86° 7' 35'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 16N WGS84 0 50 100 200 300Feet 0 15 30 60 90Meters Map Scale: 1:1,340 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. USDA 9 of 68 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 23, Sep 3, 2022 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jun 15, 2022—Jun 21, 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—Hamilton County, Indiana (11400 Westfield Boulevard Soils Map) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil SurveyUSDA D . .. 0 A. • it' 0 0 V + t+-t • 10 of 68 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI YclA Crosby silt loam, fine-loamy subsoil-Urban land complex, 0 to 2 percent slopes 1.0 22.9% YmsB2 Miami silt loam-Urban land complex, 2 to 6 percent slopes, eroded 3.4 77.1% Totals for Area of Interest 4.4 100.0% Soil Map—Hamilton County, Indiana 11400 Westfield Boulevard Soils Map Natural Resources Conservation Service Web Soil Survey National Cooperative Soil SurveyUSDA - 11 of 68 10 YR PEAK RUNOFF ONSITE ONLY 12 of 68 DETENTION DESIGN MODEL 10 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Project Description 11400 Westfield Blvd Design Rev 1.SPF Project Options CFS Elevation SCS TR-20 User-Defined Hydrodynamic YES NO Analysis Options 00:00:00 0:00:00 00:00:00 0:00:00 00:00:00 0:00:00 0 days 0 01:00:00 days hh:mm:ss 0 00:05:00 days hh:mm:ss 0 00:02:00 days hh:mm:ss 1 seconds Number of Elements Qty 1 2 4 1 2 0 0 1 3 0 1 0 2 0 0 0 0 Rainfall Details SN Rain Gage Data Data Source Rainfall Rain State County Return Rainfall Rainfall ID Source ID Type Units Period Depth Distribution (years)(inches) 49 Time Series 10 Yr Cumulative inches Indiana Hamilton 10.00 3.83 SCS Type II 24-hr Antecedent Dry Days .................................. File Name .................................................... Flow Units ................................................... Elevation Type ............................................ Hydrology Method ..................................... Time of Concentration (TOC) Method ........ Link Routing Method .................................. Enable Overflow Ponding at Nodes ............ Skip Steady State Analysis Time Periods ..... Start Analysis On ......................................... End Analysis On .......................................... Start Reporting On ...................................... Storage Nodes .................................... Runoff (Dry Weather) Time Step ................ Runoff (Wet Weather) Time Step ............... Reporting Time Step ................................... Routing Time Step ...................................... Rain Gages .................................................. Subbasins..................................................... Nodes.......................................................... Junctions ............................................. Outfalls ............................................... Flow Diversions ................................... Inlets ................................................... Outlets ................................................ Pollutants ................................................... Land Uses ................................................... Links............................................................ Channels ............................................. Pipes ................................................... Pumps ................................................. Orifices ................................................ Weirs .................................................. 13 of 68 DETENTION DESIGN MODEL 10 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Subbasin Summary SN Subbasin Area Peak Rate Weighted Total Total Total Peak Time of ID Factor Curve Rainfall Runoff Runoff Runoff Concentration Number Volume (ac)(in)(in)(ac-in)(cfs)(days hh:mm:ss) 1 Ex_Basin 1.26 484.00 80.00 3.83 1.90 2.40 2.11 0 00:30:00 2 Onsite 1.26 484.00 84.00 3.83 2.22 2.80 2.47 0 00:30:00 14 of 68 DETENTION DESIGN MODEL 10 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Node Summary SN Element Element Invert Ground/Rim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total Total Time ID Type Elevation (Max)Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded Flooded Elevation Elevation Attained Depth Attained Flooding Volume Attained Occurrence (ft)(ft)(ft)(ft)(ft²)(cfs)(ft)(ft)(ft)(days hh:mm)(ac-in)(min) 1 STR_101 Junction 815.30 817.62 815.30 817.62 0.00 0.13 815.45 0.00 2.17 0 00:00 0.00 0.00 2 EX_OUT Outfall 815.40 2.10 815.40 3 STR_100 Outfall 815.20 0.13 815.34 4 Pond Storage Node 815.40 818.50 815.40 0.00 2.47 816.93 0.00 0.00 15 of 68 DETENTION DESIGN MODEL 10 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Link Summary SN Element Element From To (Outlet)Length Inlet Outlet Average Diameter or Manning's Peak Design Flow Peak Flow/Peak Flow Peak Flow Peak Flow ID Type (Inlet)Node Invert Invert Slope Height Roughness Flow Capacity Design Flow Velocity Depth Depth/ Node Elevation Elevation Ratio Total Depth Ratio (ft)(ft)(ft)(%)(in)(cfs)(cfs)(ft/sec)(ft) 1 101_100 Pipe STR_101 STR_100 12.50 815.30 815.20 0.8000 12.000 0.0130 0.13 3.19 0.04 1.83 0.15 0.15 2 High_Flow Orifice Pond STR_101 815.40 815.30 3.000 0.00 3 Low_Flow Orifice Pond STR_101 815.40 815.30 2.000 0.13 General Orifice ID : Low_Flow Description: .. .. Properties Type: Side Diameter: 2.00 ,n Shape: Circular Width: 000 in 0 pen/close time : 0 hr s Cre st El ev .: 815.4 < ft O Flapgate Orifice coeff .. 0.614 Analysis summary Peak fl ow : 0.13 cfs Time of ma:-: occ urrence : 0 15:11 days hh:mm Connectivity Fr om (inlet): Pond S wap Inv er t elev.: 815.40 ft To (outlet]: STR 101 -Invert elev.: 815.30 ft ID / I From I To I Type I Sh ape Height / Cre st Fla p Nod e Nod e Diameter Bev. Gate 1 High Flow I Pond ' STR 10 Side 'Cir c ular 3.00 816.9 No 2 ·-· Pond STR =10 I Side Cir c ular 2.00 815.4 No 16 of 68 DETENTION DESIGN MODEL 10 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Subbasin Hydrology Subbasin : Ex_Basin Input Data Area (ac) ........................................................1.26 Peak Rate Factor ...........................................484 Weighted Curve Number ..............................80 Rain Gage ID ..................................................* Composite Curve Number 32 Area Soil Curve Soil/Surface Description (acres)Group Number > 75% grass cover, Good 1.26 D 80 Composite Area & Weighted CN 1.26 80 Subbasin Runoff Results Total Rainfall (in) ...........................................3.83 Total Runoff (in) ............................................1.9 Peak Runoff (cfs) ...........................................2.11 Weighted Curve Number ..............................80 Time of Concentration (days hh:mm:ss) .......0 00:30:00 17 of 68 DETENTION DESIGN MODEL 10 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Subbasin : Onsite Input Data Area (ac) ........................................................1.26 Peak Rate Factor ...........................................484 Weighted Curve Number ..............................84 Rain Gage ID ..................................................SCS_II_24hr Composite Curve Number 32 Area Soil Curve Soil/Surface Description (acres)Group Number Open_Space 0.98 D 80 Drive_Roof 0.28 D 98 Composite Area & Weighted CN 1.26 84 Subbasin Runoff Results Total Rainfall (in) ...........................................3.83 Total Runoff (in) ............................................2.22 Peak Runoff (cfs) ...........................................2.47 Weighted Curve Number ..............................84 Time of Concentration (days hh:mm:ss) .......0 00:30:00 18 of 68 DETENTION DESIGN MODEL 10 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Junction Input SN Element Invert Ground/Rim Ground/Rim Initial Initial Surcharge Surcharge Ponded Minimum ID Elevation (Max)(Max)Water Water Elevation Depth Area Pipe Elevation Offset Elevation Depth Cover (ft)(ft)(ft)(ft)(ft)(ft)(ft)(ft²)(in) 1 STR_101 815.30 817.62 2.32 815.30 0.00 817.62 0.00 0.00 0.00 19 of 68 DETENTION DESIGN MODEL 10 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Junction Results SN Element Peak Peak Max HGL Max HGL Max Min Average HGL Average HGL Time of Time of Total Total Time ID Inflow Lateral Elevation Depth Surcharge Freeboard Elevation Depth Max HGL Peak Flooded Flooded Inflow Attained Attained Depth Attained Attained Attained Occurrence Flooding Volume Attained Occurrence (cfs)(cfs)(ft)(ft)(ft)(ft)(ft)(ft)(days hh:mm)(days hh:mm)(ac-in)(min) 1 STR_101 0.13 0.00 815.45 0.15 0.00 2.17 815.38 0.08 0 15:11 0 00:00 0.00 0.00 20 of 68 DETENTION DESIGN MODEL 10 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Pipe Input SN Element Length Inlet Inlet Outlet Outlet Total Average Pipe Pipe Pipe Manning's Entrance Exit/Bend Additional Initial Flap No. of ID Invert Invert Invert Invert Drop Slope Shape Diameter or Width Roughness Losses Losses Losses Flow Gate Barrels Elevation Offset Elevation Offset Height (ft)(ft)(ft)(ft)(ft)(ft)(%)(in)(in)(cfs) 1 101_100 12.50 815.30 0.00 815.20 0.00 0.10 0.8000 CIRCULAR 12.000 12.000 0.0130 0.5000 0.5000 0.0000 0.00 No 1 21 of 68 DETENTION DESIGN MODEL 10 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Pipe Results SN Element Peak Time of Design Flow Peak Flow/Peak Flow Travel Peak Flow Peak Flow Total Time Froude ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/Surcharged Number Occurrence Ratio Total Depth Ratio (cfs)(days hh:mm)(cfs)(ft/sec)(min)(ft)(min) 1 101_100 0.13 0 15:11 3.19 0.04 1.83 0.11 0.15 0.15 0.00 22 of 68 DETENTION DESIGN MODEL 10 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Storage Nodes Storage Node : Pond Input Data 815.40 818.50 3.10 815.40 0.00 0.00 0.00 Outflow Orifices SN Element Orifice Orifice Flap Circular Rectangular Rectangular Orifice Orifice ID Type Shape Gate Orifice Orifice Orifice Invert Coefficient Diameter Height Width Elevation (in)(in)(in)(ft) 1 High_Flow Side CIRCULAR No 3.00 816.93 0.61 2 Low_Flow Side CIRCULAR No 2.00 815.40 0.61 Output Summary Results 2.47 2.47 0.13 0 816.93 1.53 816.12 0.72 0 15:11 0 0 0 0 Max HGL Elevation Attained (ft) ......................... Invert Elevation (ft) ............................................. Max (Rim) Elevation (ft) ...................................... Max (Rim) Offset (ft) ........................................... Initial Water Elevation (ft) ................................... Initial Water Depth (ft) ........................................ Ponded Area (ft²) ................................................. Evaporation Loss ................................................. Peak Inflow (cfs) .................................................. Peak Lateral Inflow (cfs) ...................................... Peak Outflow (cfs) ............................................... Peak Exfiltration Flow Rate (cfm) ........................ Total Time Flooded (min) .................................... Total Retention Time (sec) .................................. Max HGL Depth Attained (ft) .............................. Average HGL Elevation Attained (ft) ................... Average HGL Depth Attained (ft) ........................ Time of Max HGL Occurrence (days hh:mm) ...... Total Exfiltration Volume (1000-ft³) .................... Total Flooded Volume (ac-in) .............................. 23 of 68 100 YR PEAK RUNOFF ONSITE ONLY 24 of 68 DETENTION DESIGN MODEL 100 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Project Description 11400 Westfield Blvd Design Rev 1.SPF Project Options CFS Elevation SCS TR-20 User-Defined Hydrodynamic YES NO Analysis Options 00:00:00 0:00:00 00:00:00 0:00:00 00:00:00 0:00:00 0 days 0 01:00:00 days hh:mm:ss 0 00:05:00 days hh:mm:ss 0 00:02:00 days hh:mm:ss 1 seconds Number of Elements Qty 1 2 4 1 2 0 0 1 3 0 1 0 2 0 0 0 0 Rainfall Details SN Rain Gage Data Data Source Rainfall Rain State County Return Rainfall Rainfall ID Source ID Type Units Period Depth Distribution (years)(inches) 49 Time Series 100 Yr Cumulative inches Indiana Hamilton 100.00 6.46 SCS Type II 24-hr Antecedent Dry Days .................................. File Name .................................................... Flow Units ................................................... Elevation Type ............................................ Hydrology Method ..................................... Time of Concentration (TOC) Method ........ Link Routing Method .................................. Enable Overflow Ponding at Nodes ............ Skip Steady State Analysis Time Periods ..... Start Analysis On ......................................... End Analysis On .......................................... Start Reporting On ...................................... Storage Nodes .................................... Runoff (Dry Weather) Time Step ................ Runoff (Wet Weather) Time Step ............... Reporting Time Step ................................... Routing Time Step ...................................... Rain Gages .................................................. Subbasins..................................................... Nodes.......................................................... Junctions ............................................. Outfalls ............................................... Flow Diversions ................................... Inlets ................................................... Outlets ................................................ Pollutants ................................................... Land Uses ................................................... Links............................................................ Channels ............................................. Pipes ................................................... Pumps ................................................. Orifices ................................................ Weirs .................................................. 25 of 68 DETENTION DESIGN MODEL 100 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Subbasin Summary SN Subbasin Area Peak Rate Weighted Total Total Total Peak Time of ID Factor Curve Rainfall Runoff Runoff Runoff Concentration Number Volume (ac)(in)(in)(ac-in)(cfs)(days hh:mm:ss) 1 Ex_Basin 1.26 484.00 80.00 6.46 4.20 5.29 4.67 0 00:30:00 2 Onsite 1.26 484.00 84.00 6.46 4.63 5.83 5.10 0 00:30:00 26 of 68 DETENTION DESIGN MODEL 100 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Node Summary SN Element Element Invert Ground/Rim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total Total Time ID Type Elevation (Max)Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded Flooded Elevation Elevation Attained Depth Attained Flooding Volume Attained Occurrence (ft)(ft)(ft)(ft)(ft²)(cfs)(ft)(ft)(ft)(days hh:mm)(ac-in)(min) 1 STR_101 Junction 815.30 817.62 815.30 817.62 0.00 0.35 815.56 0.00 2.06 0 00:00 0.00 0.00 2 EX_OUT Outfall 815.40 4.65 815.40 3 STR_100 Outfall 815.20 0.35 815.42 4 Pond Storage Node 815.40 818.50 815.40 0.00 5.10 817.70 0.00 0.00 27 of 68 DETENTION DESIGN MODEL 100 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Link Summary SN Element Element From To (Outlet)Length Inlet Outlet Average Diameter or Manning's Peak Design Flow Peak Flow/Peak Flow Peak Flow Peak Flow ID Type (Inlet)Node Invert Invert Slope Height Roughness Flow Capacity Design Flow Velocity Depth Depth/ Node Elevation Elevation Ratio Total Depth Ratio (ft)(ft)(ft)(%)(in)(cfs)(cfs)(ft/sec)(ft) 1 101_100 Pipe STR_101 STR_100 12.50 815.30 815.20 0.8000 12.000 0.0130 0.35 3.19 0.11 2.37 0.24 0.24 2 High_Flow Orifice Pond STR_101 815.40 815.30 3.000 0.19 3 Low_Flow Orifice Pond STR_101 815.40 815.30 2.000 0.16 General Orifice ID : Low_Flo w Description: .. ... Properties Type : Side Diameter: 2.00 ,n Shape: Circular Width: 000 in 0 pen /close time : 0 hr s Cre st Elev.: 815.4 ft 0 Flap gate 0 rifice coeff.: 0.614 Analy sis su mmary Peak flow : 0.16 cfs Time of ma:-: occurrence: 0 13:58 days hh:mm Connecti v ity From (inl et): Pond v Swap ='--'- In vert elev.: 815.40 ft To I outlet): STR 101 -In v ert ele v .. 815.30 ft ID / I From I T o I Type I Sh ape He ight / Crest Fla p Nod e Node Di a meter Bev. Gate 1 High Flow ) Pond STR 10 Side Circular 3 00 816 .9 No --=--; 2 ·-· Pond STR_10 Sid e Circular 2.00 815.4 No - 28 of 68 DETENTION DESIGN MODEL 100 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Subbasin Hydrology Subbasin : Ex_Basin Input Data Area (ac) ........................................................1.26 Peak Rate Factor ...........................................484 Weighted Curve Number ..............................80 Rain Gage ID ..................................................* Composite Curve Number 32 Area Soil Curve Soil/Surface Description (acres)Group Number > 75% grass cover, Good 1.26 D 80 Composite Area & Weighted CN 1.26 80 Subbasin Runoff Results Total Rainfall (in) ...........................................6.46 Total Runoff (in) ............................................4.2 Peak Runoff (cfs) ...........................................4.67 Weighted Curve Number ..............................80 Time of Concentration (days hh:mm:ss) .......0 00:30:00 29 of 68 DETENTION DESIGN MODEL 100 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Subbasin : Onsite Input Data Area (ac) ........................................................1.26 Peak Rate Factor ...........................................484 Weighted Curve Number ..............................84 Rain Gage ID ..................................................SCS_II_24hr Composite Curve Number 32 Area Soil Curve Soil/Surface Description (acres)Group Number Open_Space 0.98 D 80 Drive_Roof 0.28 D 98 Composite Area & Weighted CN 1.26 84 Subbasin Runoff Results Total Rainfall (in) ...........................................6.46 Total Runoff (in) ............................................4.63 Peak Runoff (cfs) ...........................................5.1 Weighted Curve Number ..............................84 Time of Concentration (days hh:mm:ss) .......0 00:30:00 30 of 68 DETENTION DESIGN MODEL 100 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Junction Input SN Element Invert Ground/Rim Ground/Rim Initial Initial Surcharge Surcharge Ponded Minimum ID Elevation (Max)(Max)Water Water Elevation Depth Area Pipe Elevation Offset Elevation Depth Cover (ft)(ft)(ft)(ft)(ft)(ft)(ft)(ft²)(in) 1 STR_101 815.30 817.62 2.32 815.30 0.00 817.62 0.00 0.00 0.00 31 of 68 DETENTION DESIGN MODEL 100 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Junction Results SN Element Peak Peak Max HGL Max HGL Max Min Average HGL Average HGL Time of Time of Total Total Time ID Inflow Lateral Elevation Depth Surcharge Freeboard Elevation Depth Max HGL Peak Flooded Flooded Inflow Attained Attained Depth Attained Attained Attained Occurrence Flooding Volume Attained Occurrence (cfs)(cfs)(ft)(ft)(ft)(ft)(ft)(ft)(days hh:mm)(days hh:mm)(ac-in)(min) 1 STR_101 0.35 0.00 815.56 0.26 0.00 2.06 815.44 0.14 0 13:58 0 00:00 0.00 0.00 32 of 68 DETENTION DESIGN MODEL 100 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Pipe Input SN Element Length Inlet Inlet Outlet Outlet Total Average Pipe Pipe Pipe Manning's Entrance Exit/Bend Additional Initial Flap No. of ID Invert Invert Invert Invert Drop Slope Shape Diameter or Width Roughness Losses Losses Losses Flow Gate Barrels Elevation Offset Elevation Offset Height (ft)(ft)(ft)(ft)(ft)(ft)(%)(in)(in)(cfs) 1 101_100 12.50 815.30 0.00 815.20 0.00 0.10 0.8000 CIRCULAR 12.000 12.000 0.0130 0.5000 0.5000 0.0000 0.00 No 1 33 of 68 DETENTION DESIGN MODEL 100 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Pipe Results SN Element Peak Time of Design Flow Peak Flow/Peak Flow Travel Peak Flow Peak Flow Total Time Froude ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/Surcharged Number Occurrence Ratio Total Depth Ratio (cfs)(days hh:mm)(cfs)(ft/sec)(min)(ft)(min) 1 101_100 0.35 0 13:59 3.19 0.11 2.37 0.09 0.24 0.24 0.00 34 of 68 DETENTION DESIGN MODEL 100 YEAR ONSITE ONLY ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:08-MAR-2024 Storage Nodes Storage Node : Pond Input Data 815.40 818.50 3.10 815.40 0.00 0.00 0.00 Outflow Orifices SN Element Orifice Orifice Flap Circular Rectangular Rectangular Orifice Orifice ID Type Shape Gate Orifice Orifice Orifice Invert Coefficient Diameter Height Width Elevation (in)(in)(in)(ft) 1 High_Flow Side CIRCULAR No 3.00 816.93 0.61 2 Low_Flow Side CIRCULAR No 2.00 815.40 0.61 Output Summary Results 5.1 5.1 0.35 0 817.7 2.3 816.48 1.08 0 13:58 0 0 0 0 Max HGL Elevation Attained (ft) ........................... Invert Elevation (ft) ............................................... Max (Rim) Elevation (ft) ........................................ Max (Rim) Offset (ft) ............................................. Initial Water Elevation (ft) .................................... Initial Water Depth (ft) ......................................... Ponded Area (ft²) .................................................. Evaporation Loss ................................................... Peak Inflow (cfs) .................................................... Peak Lateral Inflow (cfs) ........................................ Peak Outflow (cfs) ................................................. Peak Exfiltration Flow Rate (cfm) .......................... Total Time Flooded (min) ...................................... Total Retention Time (sec) .................................... Max HGL Depth Attained (ft) ................................ Average HGL Elevation Attained (ft) ..................... Average HGL Depth Attained (ft) .......................... Time of Max HGL Occurrence (days hh:mm) ........ Total Exfiltration Volume (1000-ft³) ..................... Total Flooded Volume (ac-in) ................................ 35 of 68 10 YR PEAK RUNOFF ONSITE AND OFFSITE 36 of 68 DETENTION DESIGN MODEL 10 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Project Description 11400 Westfield Blvd Design Offsite Rev 2.SPF Project Options CFS Elevation SCS TR-20 User-Defined Hydrodynamic YES NO Analysis Options 00:00:00 0:00:00 00:00:00 0:00:00 00:00:00 0:00:00 0 days 0 01:00:00 days hh:mm:ss 0 00:05:00 days hh:mm:ss 0 00:02:00 days hh:mm:ss 1 seconds Number of Elements Qty 1 2 5 1 3 0 0 1 6 0 1 0 3 2 0 0 0 Rainfall Details SN Rain Gage Data Data Source Rainfall Rain State County Return Rainfall Rainfall ID Source ID Type Units Period Depth Distribution (years)(inches) 49 Time Series 10 Yr Cumulative inches Indiana Hamilton 10.00 3.83 SCS Type II 24-hr Outlets ................................................ Pollutants ................................................... Land Uses ................................................... Links............................................................ Channels ............................................. Pipes ................................................... Pumps ................................................. Orifices ................................................ Weirs .................................................. Storage Nodes .................................... Runoff (Dry Weather) Time Step ................ Runoff (Wet Weather) Time Step ............... Reporting Time Step ................................... Routing Time Step ...................................... Rain Gages .................................................. Subbasins..................................................... Nodes.......................................................... Junctions ............................................. Outfalls ............................................... Flow Diversions ................................... Inlets ................................................... Antecedent Dry Days .................................. File Name .................................................... Flow Units ................................................... Elevation Type ............................................ Hydrology Method ..................................... Time of Concentration (TOC) Method ........ Link Routing Method .................................. Enable Overflow Ponding at Nodes ............ Skip Steady State Analysis Time Periods ..... Start Analysis On ......................................... End Analysis On .......................................... Start Reporting On ...................................... 37 of 68 DETENTION DESIGN MODEL 10 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Subbasin Summary SN Subbasin Area Peak Rate Weighted Total Total Total Peak Time of ID Factor Curve Rainfall Runoff Runoff Runoff Concentration Number Volume (ac)(in)(in)(ac-in)(cfs)(days hh:mm:ss) 1 Offsite 3.01 484.00 84.00 3.83 2.22 6.69 4.55 0 00:45:00 2 Onsite 1.26 484.00 84.00 3.83 2.22 2.80 2.47 0 00:30:00 38 of 68 DETENTION DESIGN MODEL 10 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Node Summary SN Element Element Invert Ground/Rim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total Total Time ID Type Elevation (Max)Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded Flooded Elevation Elevation Attained Depth Attained Flooding Volume Attained Occurrence (ft)(ft)(ft)(ft)(ft²)(cfs)(ft)(ft)(ft)(days hh:mm)(ac-in)(min) 1 STR_101 Junction 815.30 817.70 815.30 817.70 0.00 2.39 816.18 0.00 1.52 0 00:00 0.00 0.00 2 Offsite_Outlet Outfall 817.70 0.10 817.70 3 Out_Emerg_Weir Outfall 815.20 0.00 815.20 4 STR_100 Outfall 815.20 2.39 815.85 5 Pond Storage Node 815.40 818.50 815.40 0.00 6.71 817.90 0.00 0.00 39 of 68 DETENTION DESIGN MODEL 10 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Link Summary SN Element Element From To (Outlet)Length Inlet Outlet Average Diameter or Manning's Peak Design Flow Peak Flow/Peak Flow Peak Flow ID Type (Inlet)Node Invert Invert Slope Height Roughness Flow Capacity Design Flow Velocity Depth Node Elevation Elevation Ratio (ft)(ft)(ft)(%)(in)(cfs)(cfs)(ft/sec)(ft) 1 101_100 Pipe STR_101 STR_100 12.50 815.30 815.20 0.8000 12.000 0.0130 2.39 3.19 0.75 3.73 0.76 2 High_Flow Orifice Pond STR_101 815.40 815.30 3.000 0.22 3 Low_Flow Orifice Pond STR_101 815.40 815.30 2.000 0.16 4 STR_101 Orifice Pond STR_101 815.40 815.30 30.000 2.03 5 Comp_Weir Weir Pond Offsite_Outlet 815.40 817.70 0.10 6 Emerg_Weir Weir Pond Out_Emerg_Weir 815.40 815.20 0.00 40 of 68 DETENTION DESIGN MODEL 10 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Subbasin Hydrology Subbasin : Offsite Input Data Area (ac) .......................................................3.01 Peak Rate Factor ..........................................484 Weighted Curve Number ..............................84 Rain Gage ID .................................................* Composite Curve Number 32 Area Soil Curve Soil/Surface Description (acres)Group Number 1 acre lots, 20% impervious_(North)1.03 D 84 1 acre lots, 20% impervious_(West)1.98 D 84 Composite Area & Weighted CN 3.01 84 Subbasin Runoff Results Total Rainfall (in) ..........................................3.83 Total Runoff (in) ...........................................2.22 Peak Runoff (cfs) ..........................................4.55 Weighted Curve Number ..............................84 Time of Concentration (days hh:mm:ss) ......0 00:45:00 41 of 68 DETENTION DESIGN MODEL 10 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Subbasin : Onsite Input Data Area (ac) .......................................................1.26 Peak Rate Factor ..........................................484 Weighted Curve Number ..............................84 Rain Gage ID .................................................SCS_II_24hr Composite Curve Number 32 Area Soil Curve Soil/Surface Description (acres)Group Number Open_Space 0.98 D 80 Drives_Roof 0.28 D 98 Composite Area & Weighted CN 1.26 84 Subbasin Runoff Results Total Rainfall (in) ..........................................3.83 Total Runoff (in) ...........................................2.22 Peak Runoff (cfs) ..........................................2.47 Weighted Curve Number ..............................84 Time of Concentration (days hh:mm:ss) ......0 00:30:00 42 of 68 DETENTION DESIGN MODEL 10 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Junction Input SN Element Invert Ground/Rim Ground/Rim Initial Initial Surcharge Surcharge Ponded Minimum ID Elevation (Max)(Max)Water Water Elevation Depth Area Pipe Elevation Offset Elevation Depth Cover (ft)(ft)(ft)(ft)(ft)(ft)(ft)(ft²)(in) 1 STR_101 815.30 817.70 2.40 815.30 0.00 817.70 0.00 0.00 0.00 43 of 68 DETENTION DESIGN MODEL 10 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Junction Results SN Element Peak Peak Max HGL Max HGL Max Min Average HGL Average HGL Time of Time of Total Total Time ID Inflow Lateral Elevation Depth Surcharge Freeboard Elevation Depth Max HGL Peak Flooded Flooded Inflow Attained Attained Depth Attained Attained Attained Occurrence Flooding Volume Attained Occurrence (cfs)(cfs)(ft)(ft)(ft)(ft)(ft)(ft)(days hh:mm)(days hh:mm)(ac-in)(min) 1 STR_101 2.39 0.00 816.18 0.88 0.00 1.52 815.47 0.17 0 12:52 0 00:00 0.00 0.00 44 of 68 DETENTION DESIGN MODEL 10 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Pipe Input SN Element Length Inlet Inlet Outlet Outlet Total Average Pipe Pipe Pipe Manning's Entrance Exit/Bend Additional Initial Flap No. of ID Invert Invert Invert Invert Drop Slope Shape Diameter or Width Roughness Losses Losses Losses Flow Gate Barrels Elevation Offset Elevation Offset Height (ft)(ft)(ft)(ft)(ft)(ft)(%)(in)(in)(cfs) 1 101_100 12.50 815.30 0.00 815.20 0.00 0.10 0.8000 CIRCULAR 12.000 12.000 0.0130 0.5000 0.5000 0.0000 0.00 No 1 45 of 68 DETENTION DESIGN MODEL 10 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Pipe Results SN Element Peak Time of Design Flow Peak Flow/Peak Flow Travel Peak Flow Peak Flow Total Time Froude Reported ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/Surcharged Number Condition Occurrence Ratio Total Depth Ratio (cfs)(days hh:mm)(cfs)(ft/sec)(min)(ft)(min) 1 101_100 2.39 0 12:52 3.19 0.75 3.73 0.06 0.76 0.76 0.00 Calculated 46 of 68 DETENTION DESIGN MODEL 10 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Storage Nodes Storage Node : Pond Input Data 815.40 818.50 3.10 815.40 0.00 0.00 0.00 Outflow Weirs SN Element Weir Flap Crest Crest Length Weir Total Discharge ID Type Gate Elevation Offset Height Coefficient (ft)(ft)(ft)(ft) 1 Comp_Weir Rectangular No 817.70 2.30 0.33 0.54 3.33 2 Emerg_Weir Trapezoidal No 818.25 2.85 15.00 1.00 3.33 Outflow Orifices SN Element Orifice Orifice Flap Circular Rectangular Rectangular Orifice Orifice ID Type Shape Gate Orifice Orifice Orifice Invert Coefficient Diameter Height Width Elevation (in)(in)(in)(ft) 1 High_Flow Side CIRCULAR No 3.00 816.93 0.61 2 Low_Flow Side CIRCULAR No 2.00 815.40 0.61 3 STR_101 Bottom Rectangular No 30.00 12.00 817.70 0.63 Output Summary Results 6.71 6.71 2.49 0 817.9 2.5 816.55 1.15 0 12:52 0 0 0 0 Total Time Flooded (min) ............................................ Total Retention Time (sec) .......................................... Max HGL Depth Attained (ft) ....................................... Average HGL Elevation Attained (ft) ............................ Average HGL Depth Attained (ft) ................................. Time of Max HGL Occurrence (days hh:mm) ............... Total Exfiltration Volume (1000-ft³) ............................ Total Flooded Volume (ac-in) ...................................... Max HGL Elevation Attained (ft) .................................. Invert Elevation (ft) ..................................................... Max (Rim) Elevation (ft) .............................................. Max (Rim) Offset (ft) ................................................... Initial Water Elevation (ft) ........................................... Initial Water Depth (ft) ................................................ Ponded Area (ft²) ......................................................... Evaporation Loss ......................................................... Peak Inflow (cfs) .......................................................... Peak Lateral Inflow (cfs) .............................................. Peak Outflow (cfs) ....................................................... Peak Exfiltration Flow Rate (cfm) ................................ 47 of 68 100 YEAR PEAK RUNOFF ONSITE AND OFFSITE 48 of 68 DETENTION DESIGN MODEL 100 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Project Description 11400 Westfield Blvd Design Offsite Rev 2.SPF Project Options CFS Elevation SCS TR-20 User-Defined Hydrodynamic YES NO Analysis Options 00:00:00 0:00:00 00:00:00 0:00:00 00:00:00 0:00:00 0 days 0 01:00:00 days hh:mm:ss 0 00:05:00 days hh:mm:ss 0 00:02:00 days hh:mm:ss 1 seconds Number of Elements Qty 1 2 5 1 3 0 0 1 6 0 1 0 3 2 0 0 0 Rainfall Details SN Rain Gage Data Data Source Rainfall Rain State County Return Rainfall Rainfall ID Source ID Type Units Period Depth Distribution (years)(inches) 49 Time Series 100 Yr Cumulative inches Indiana Hamilton 100.00 6.46 SCS Type II 24-hr Antecedent Dry Days .................................. File Name .................................................... Flow Units ................................................... Elevation Type ............................................ Hydrology Method ..................................... Time of Concentration (TOC) Method ........ Link Routing Method .................................. Enable Overflow Ponding at Nodes ............ Skip Steady State Analysis Time Periods ..... Start Analysis On ......................................... End Analysis On .......................................... Start Reporting On ...................................... Storage Nodes .................................... Runoff (Dry Weather) Time Step ................ Runoff (Wet Weather) Time Step ............... Reporting Time Step ................................... Routing Time Step ...................................... Rain Gages .................................................. Subbasins..................................................... Nodes.......................................................... Junctions ............................................. Outfalls ............................................... Flow Diversions ................................... Inlets ................................................... Outlets ................................................ Pollutants ................................................... Land Uses ................................................... Links............................................................ Channels ............................................. Pipes ................................................... Pumps ................................................. Orifices ................................................ Weirs .................................................. 49 of 68 DETENTION DESIGN MODEL 100 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Subbasin Summary SN Subbasin Area Peak Rate Weighted Total Total Total Peak Time of ID Factor Curve Rainfall Runoff Runoff Runoff Concentration Number Volume (ac)(in)(in)(ac-in)(cfs)(days hh:mm:ss) 1 Offsite 3.01 484.00 84.00 6.46 4.63 13.93 9.41 0 00:45:00 2 Onsite 1.26 484.00 84.00 6.46 4.63 5.83 5.10 0 00:30:00 50 of 68 DETENTION DESIGN MODEL 100 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Node Summary SN Element Element Invert Ground/Rim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total Total Time ID Type Elevation (Max)Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded Flooded Elevation Elevation Attained Depth Attained Flooding Volume Attained Occurrence (ft)(ft)(ft)(ft)(ft²)(cfs)(ft)(ft)(ft)(days hh:mm)(ac-in)(min) 1 STR_101 Junction 815.30 817.70 815.30 817.70 0.00 9.59 817.70 0.00 0.00 0 12:31 1.14 34.00 2 Offsite_Outlet Outfall 817.70 0.96 817.70 3 Out_Emerg_Weir Outfall 815.20 0.00 815.20 4 STR_100 Outfall 815.20 6.54 816.20 5 Pond Storage Node 815.40 818.50 815.40 0.00 13.87 818.25 0.00 0.00 51 of 68 DETENTION DESIGN MODEL 100 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Link Summary SN Element Element From To (Outlet)Length Inlet Outlet Average Diameter or Manning's Peak Design Flow Peak Flow/Peak Flow Peak Flow ID Type (Inlet)Node Invert Invert Slope Height Roughness Flow Capacity Design Flow Velocity Depth Node Elevation Elevation Ratio (ft)(ft)(ft)(%)(in)(cfs)(cfs)(ft/sec)(ft) 1 101_100 Pipe STR_101 STR_100 12.50 815.30 815.20 0.8000 12.000 0.0130 6.54 3.19 2.05 8.33 1.00 2 High_Flow Orifice Pond STR_101 815.40 815.30 3.000 0.24 3 Low_Flow Orifice Pond STR_101 815.40 815.30 2.000 0.16 4 STR_101 Orifice Pond STR_101 815.40 815.30 30.000 9.33 5 Comp_Weir Weir Pond Offsite_Outlet 815.40 817.70 0.96 6 Emerg_Weir Weir Pond Out_Emerg_Weir 815.40 815.20 0.00 52 of 68 DETENTION DESIGN MODEL 100 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Subbasin Hydrology Subbasin : Offsite Input Data Area (ac) .......................................................3.01 Peak Rate Factor ..........................................484 Weighted Curve Number ..............................84 Rain Gage ID .................................................* Composite Curve Number 32 Area Soil Curve Soil/Surface Description (acres)Group Number 1 acre lots, 20% impervious_(North)1.03 D 84 1 acre lots, 20% impervious_(West)1.98 D 84 Composite Area & Weighted CN 3.01 84 Subbasin Runoff Results Total Rainfall (in) ..........................................6.46 Total Runoff (in) ...........................................4.63 Peak Runoff (cfs) ..........................................9.41 Weighted Curve Number ..............................84 Time of Concentration (days hh:mm:ss) ......0 00:45:00 53 of 68 DETENTION DESIGN MODEL 100 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Subbasin : Onsite Input Data Area (ac) .......................................................1.26 Peak Rate Factor ..........................................484 Weighted Curve Number ..............................84 Rain Gage ID .................................................SCS_II_24hr Composite Curve Number 32 Area Soil Curve Soil/Surface Description (acres)Group Number Open_Space 0.98 D 80 Drives_Roof 0.28 D 98 Composite Area & Weighted CN 1.26 84 Subbasin Runoff Results Total Rainfall (in) ..........................................6.46 Total Runoff (in) ...........................................4.63 Peak Runoff (cfs) ..........................................5.1 Weighted Curve Number ..............................84 Time of Concentration (days hh:mm:ss) ......0 00:30:00 54 of 68 DETENTION DESIGN MODEL 100 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Junction Input SN Element Invert Ground/Rim Ground/Rim Initial Initial Surcharge Surcharge Ponded Minimum ID Elevation (Max)(Max)Water Water Elevation Depth Area Pipe Elevation Offset Elevation Depth Cover (ft)(ft)(ft)(ft)(ft)(ft)(ft)(ft²)(in) 1 STR_101 815.30 817.70 2.40 815.30 0.00 817.70 0.00 0.00 0.00 55 of 68 DETENTION DESIGN MODEL 100 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Junction Results SN Element Peak Peak Max HGL Max HGL Max Min Average HGL Average HGL Time of Time of Total Total Time ID Inflow Lateral Elevation Depth Surcharge Freeboard Elevation Depth Max HGL Peak Flooded Flooded Inflow Attained Attained Depth Attained Attained Attained Occurrence Flooding Volume Attained Occurrence (cfs)(cfs)(ft)(ft)(ft)(ft)(ft)(ft)(days hh:mm)(days hh:mm)(ac-in)(min) 1 STR_101 9.59 0.00 817.70 2.40 0.00 0.00 815.59 0.29 0 12:18 0 12:31 1.14 34.00 56 of 68 DETENTION DESIGN MODEL 100 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Pipe Input SN Element Length Inlet Inlet Outlet Outlet Total Average Pipe Pipe Pipe Manning's Entrance Exit/Bend Additional Initial Flap No. of ID Invert Invert Invert Invert Drop Slope Shape Diameter or Width Roughness Losses Losses Losses Flow Gate Barrels Elevation Offset Elevation Offset Height (ft)(ft)(ft)(ft)(ft)(ft)(%)(in)(in)(cfs) 1 101_100 12.50 815.30 0.00 815.20 0.00 0.10 0.8000 CIRCULAR 12.000 12.000 0.0130 0.5000 0.5000 0.0000 0.00 No 1 57 of 68 DETENTION DESIGN MODEL 100 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Pipe Results SN Element Peak Time of Design Flow Peak Flow/Peak Flow Travel Peak Flow Peak Flow Total Time Froude ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/Surcharged Number Occurrence Ratio Total Depth Ratio (cfs)(days hh:mm)(cfs)(ft/sec)(min)(ft)(min) 1 101_100 6.54 0 12:18 3.19 2.05 8.33 0.03 1.00 1.00 69.00 58 of 68 DETENTION DESIGN MODEL 100 YEAR ROBBINS SUBDIV 11400 WESTFIELD BLVD CARMEL, IN 46032 DATE:23-APR-2024 Storage Nodes Storage Node : Pond Input Data 815.40 818.50 3.10 815.40 0.00 0.00 0.00 Outflow Weirs SN Element Weir Flap Crest Crest Length Weir Total Discharge ID Type Gate Elevation Offset Height Coefficient (ft)(ft)(ft)(ft) 1 Comp_Weir Rectangular No 817.70 2.30 0.71 0.54 3.33 2 Emerg_Weir Trapezoidal No 818.25 2.85 15.00 1.00 3.33 Outflow Orifices SN Element Orifice Orifice Flap Circular Rectangular Rectangular Orifice Orifice ID Type Shape Gate Orifice Orifice Orifice Invert Coefficient Diameter Height Width Elevation (in)(in)(in)(ft) 1 High_Flow Side CIRCULAR No 3.00 816.93 0.61 2 Low_Flow Side CIRCULAR No 2.00 815.40 0.61 3 STR_101 Bottom Rectangular No 30.00 12.00 817.70 0.63 Output Summary Results 13.87 13.87 10.55 0 818.25 2.85 816.72 1.32 0 12:31 0 0 0 0 Max HGL Elevation Attained (ft) ................................ Invert Elevation (ft) .................................................... Max (Rim) Elevation (ft) ............................................. Max (Rim) Offset (ft) .................................................. Initial Water Elevation (ft) ......................................... Initial Water Depth (ft) .............................................. Ponded Area (ft²) ....................................................... Evaporation Loss ....................................................... Peak Inflow (cfs) ........................................................ Peak Lateral Inflow (cfs) ............................................ Peak Outflow (cfs) ..................................................... Peak Exfiltration Flow Rate (cfm) .............................. Total Time Flooded (min) .......................................... Total Retention Time (sec) ........................................ Max HGL Depth Attained (ft) ..................................... Average HGL Elevation Attained (ft) .......................... Average HGL Depth Attained (ft) ............................... Time of Max HGL Occurrence (days hh:mm) ............. Total Exfiltration Volume (1000-ft³) .......................... Total Flooded Volume (ac-in) .................................... 59 of 68 EMERGENCY WEIR 60 of 68 Emergency Overflow Weir Design Q_Peak 100 yr = 13.9 cfs (onsite + offsite) 1.25xQ_Peak = 17.3 cfs (flow depth = 0.50 Ō) Section Item Input W ei" Cales Depth (ft) 0.36 0.43 0 .50 Wer Type= Crest= Bottom Len (ft) = Total Depth (ft ) = Side Slope, z :1 = WerCoeff= Compute by= Increments= a (cfs) 10.62 14.12 17.98 Trapezoidal Sharp 15.00 0.72 3.00 3.10 a VS Depth 10 Area (sqft) 5.79 7 .04 8 .32 Depth (ft) <Name> Depth (ft) 1.00 --------------~------~-----~---------------------1.00 0.50 0.00 -0.50 ---c hannel ---w.s. Veloc (ft/s) 1 .84 2 .01 2 .16 10 15 TopWodth (ft) 17.16 17.59 18.02 20 25 30 Energy (ft) 0.41 0.49 0.58 0.50 0.00 35 Reach (ft) 61 of 68 CULVERT 62 of 68 Culvert Analysis Time of Concentration Robbins Subdivision 11400 Westfield Boulevard Carmel, IN 46032 Sheet Flow Grass Paved n 0.24 0 L 100 ft 0 ft P2 2.64 in 2.64 in s 0.010 ft/ft 0.010 ft/ft Tt 0.35 hr 0.00 hr 21 min 0 min Shallow Concentrated Flow Grassed 1 L 238 ft s 0.010 ft/ft Vavg 1.6 ft/s Tt 2.5 min Grassed 2 L 238 ft s 0.010 ft/ft Vavg 1.6 ft/s Tt 2.5 min Channel/Pipe Flow Total Tc 26 (Pre-Developed) 63 of 68 Project Description Culvert Analysis.SPF Project Options CFS Elevation SCS TR-20 User-Defined Hydrodynamic YES NO Analysis Options 00:00:00 0:00:00 00:00:00 0:00:00 00:00:00 0:00:00 0 days 0 01:00:00 days hh:mm:ss 0 00:05:00 days hh:mm:ss 0 00:01:00 days hh:mm:ss 1 seconds Number of Elements Rainfall Qty Distribution 1 1 SCS Type II 24-hr 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 Rainfall Details SN Rain Gage Data Data Source Rainfall Rain State County Return Rainfall ID Source ID Type Units Period Depth (years)(inches) 49 Time Series 25 Yr Ham Co Cumulative inches Indiana Hamilton 25.00 4.72 Antecedent Dry Days ...................................... File Name ........................................................ Flow Units ....................................................... Elevation Type ................................................ Hydrology Method ......................................... Time of Concentration (TOC) Method ........... Link Routing Method ...................................... Enable Overflow Ponding at Nodes ............... Skip Steady State Analysis Time Periods ........ Start Analysis On ............................................ End Analysis On .............................................. Start Reporting On .......................................... Storage Nodes ........................................ Runoff (Dry Weather) Time Step ................... Runoff (Wet Weather) Time Step .................. Reporting Time Step ....................................... Routing Time Step .......................................... Rain Gages ...................................................... Subbasins......................................................... Nodes............................................................... Junctions ................................................. Outfalls ................................................... Flow Diversions ....................................... Inlets ....................................................... Outlets .................................................... Pollutants ........................................................ Land Uses ........................................................ Links................................................................. Channels ................................................. Pipes ........................................................ Pumps ..................................................... Orifices .................................................... Weirs ....................................................... 64 of 68 Subbasin Summary SN Subbasin Area Peak Rate Weighted Total Total Total Peak Time of ID Factor Curve Rainfall Runoff Runoff Runoff Concentration Number Volume (ac)(in)(in)(ac-in)(cfs)(days hh:mm:ss) 1 Sub-01 4.68 484.00 66.92 4.72 1.61 7.51 7.03 0 00:25:00 65 of 68 Node Summary SN Element Element Invert Ground/Rim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total Total Time ID Type Elevation (Max)Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded Flooded Elevation Elevation Attained Depth Attained Flooding Volume Attained Occurrence (ft)(ft)(ft)(ft)(ft²)(cfs)(ft)(ft)(ft)(days hh:mm)(ac-in)(min) 1 Out-01 Outfall 815.40 0.00 0.00 66 of 68 Subbasin Hydrology Subbasin : Sub-01 Input Data Area (ac) ........................................................4.68 Peak Rate Factor ............................................484 Weighted Curve Number ..............................66.92 Rain Gage ID .................................................. Composite Curve Number 32 Area Soil Curve Soil/Surface Description (acres)Group Number -3.93 -61 -0.75 -98 Composite Area & Weighted CN 4.68 66.92 Subbasin Runoff Results Total Rainfall (in) ...........................................4.72 Total Runoff (in) ............................................1.61 Peak Runoff (cfs) ...........................................7.03 Weighted Curve Number ..............................66.92 Time of Concentration (days hh:mm:ss) ......0 00:25:00 67 of 68 Driveway Culvert Q_Peak 25 yr Analysis Q_Peak 25 yr (4.68 AC) = 7.00 cfs Tol al (els) S.00 6.00 7.00 Elev (ft) 818.00 817.50 817.00 816.50 816.00 815.50 815,00 ------- -- - -- ~7 -l - --------- -- -_/ i, - --------- -/ ----------------- 814.50 - 0 2 ----ClreularColvert Q ~ (els) S.00 6.00 7.00 Over (els) 0.00 0.00 0.00 6 ----HGL On (flls) 4 .44 S.17 S.9·1 Veloc Up (flls) S.23 S.74 6 ,31 10 ----Embank -- 12 Depth On (i1) 12.94 13.4◄ 13.S6 Up (h) 10.90 11 .91 12.71 - - 14 - - ---- ~ --- 16 On (fl) 816.18 816.22 816.2S --- 18 Up (fl) 816.11 816.19 816.26 - -lnletcc ~ l~ ~ r- ----- -- nlrol- - -- - - --- HwOepll\(ft) 2.80 2 .30 1.80 1.30 0.80 0 .30 -0.20 -- -0.70 20 22 24 Hw (fl) 816.69 8 16.98 817.33 HGL Hw/0 1.20 1.43 1 .70 68 of 68