Loading...
The URL can be used to link to this page
Your browser does not support the video tag.
Home
My WebLink
About
241FA - Technical Report
TechnicalInformationReport JimThomasResidence SingleFamilyResidentialConstruction 2411stAveSoutheast Carmel,IN46033 ϬϵͲDĂƌͲ202Ϯ PreparedFor: JimThomas 4918DeerRidgeDrive Carmel,IN46033 PreparedBy: WilliamA.Cash 212RedwoodCircle Noblesville,IN46062 TableofContents I. Coversheet II. Narrative a. ExistingConditions b. DevelopedConditions c. Summary III. TechnicalDesign a. SiteLocationMap b. ExistingBasinMap c. OverallCombinedLotAreaSummary d. SoilsMap e. Pre&PostCNDataCharts f. RainfallData g. DetentionModelSchematic h. StageStorageGraph i. 10YrPeakRunoffGraph j. 100YrPeakRunoffGraph k. StorageVolumevs.TimeGraph l. 10YrDesignModelInput/Output m. 100YrDesignModelInput/Output ProjectNarrative ExistingConditions Thepropertyownerplanstoreplatandcombinethe2411stAveparcelwiththeparcel immediatelynorthforacombinedtotal0.399acreparcel.Previouslytheparcelscontained approximately14%impervioussurfacewhichconsistedofahouseandgarage.Bothstructures wereremovedinanticipationofthenewproject.Forthepurposeofthisreporttheexisting conditionCNfortheHSGBsoilswastakenfromtheprovidedUrbanDevelopmentCNtableas definedforatypical0.25acresidentiallotdevelopment.Drainagegenerallysheetflowsfrom thenortheasttosouthwest.Drainagecrossingthesouthboundaryentersontotheexisting stonealleyandthenflowswesttowards1stAvenue.Thecombinedparcelareawasdivided intotwodrainagebasinsconsistingofaNorthBasinandaSouthBasin.ThedevelopmentƉĞĂŬ ƌƵŶŽĨĨislimitedtotheSouthBasinthereforethepresentedcalculationspertaintothis0.260 acrearea. ProposedConditions Theonsiteimprovementsconsistofanew5,719sfhome,ƉŽŽůĂŶĚĚĞĐŬĂƌĞĂ͕drivewayand stormwaterimprovements.Theoffsiteimprovementsconsistoftheconversionofthestone alleytoasphaltpavement.Toaddresstheadditionalrunofffromthelargerhometheowner planstoinstallatotalϰϬϲlinearfeetofperforated12”undergrounddetentionpiping.The perforatedHDPEpipewilldraintoastoneenvelopconsistingofapproximately40%voidspace. Thesystemwillprovideanapproximateϵϱϱcubicfeetofstorageandfunctiontoattenuatethe 10yrand100yeardevelopedstormpeakrunoffrates.TheprovidedcalculationƐconfirmthat theproposeddevelopmentshouldnotgeneratepeakdischargeswhichwouldexceedthe existingrates.Thefollowingtableoutlinesthepreandpostreleaserates. ReturnTimeExistingQpPostUndetainedQpPostDetainedQp 10Year0.430.660.4Ϯ 100Year1.051.390.ϴϬ Summary Theresidentialprojectwillinvolvestormwaterimprovementsincludingunderground detention,sumped/hoodeddrainagebasins,andanoffsiteinfiltrationtrench.Alldrainagefrom thenewroofwilldraindirectlytotheundergrounddetentionsystem.Asmallerdiameter dischargelinefromthedetentionsystemdirectstheflowtothesouthanddischargestothe alley.Thepavedalleydrainswestto1stAvenue.Thedetentionsystemattenuatesthe10Yr and100Yearpeakflowtoratestotheexistingconditionscomparabletoa0.25Acreresidential lotdevelopment. Site Location Map Project Site Parcel Consolidation GRAVEL GRAVEL850 851850849 84884784684 5 844843842850 849 848 84 7 84 6 845 844 84 3843 842 841 840 846851 844843842843844 841 849848847846845844843SCALE: 1" = 60' PROJECT LOCATION CARMEL VIEW RESIDENTIAL DEVELOPMENT EXISTING OFFSITE BASIN MAP DATE: 14-JUL-211ST AVENUECARMEL VIEW DR. AreaSummary 2411stAve Carmel,IN46033 ExistingConditions Area[sf] Area[ac] TotalArea 17,388 0.399 House 1,850 0.042 Garage 665 0.015 Turf 14,873 0.341 TotalImperviousArea 2,515 0.058 %Coverage 14% ProposedConditions Area[sf] TotalArea 17,388 0.399 House 5,719 0.131 Pool&Deck 2,234 0.051 Driveway 580 0.013 Walk 140 0.003 Turf 8,715 0.200 TotalImperviousArea 8,673 0.199 %Coverage 50% Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 7/18/2021 Page 1 of 34425420 4425430 4425440 4425450 4425460 4425470 4425480 4425490 4425500 44255104425430 4425440 4425450 4425460 4425470 4425480 4425490 4425500 4425510574650 574660 574670 574680 574690 574700 574710 574650 574660 574670 574680 574690 574700 574710 39° 58' 35'' N 86° 7' 33'' W39° 58' 35'' N86° 7' 30'' W39° 58' 32'' N 86° 7' 33'' W39° 58' 32'' N 86° 7' 30'' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 16N WGS84 0 20 40 80 120 Feet 0 5 10 20 30 Meters Map Scale: 1:452 if printed on A portrait (8.5" x 11") sheet. Soill Mapp mayy nott bee validd att thiss scale. MAP LEGEND MAP INFORMATIONArea of Interest (AOI)Area of Interest (AOI)SoilsSoil Map Unit PolygonsSoil Map Unit LinesSoil Map Unit PointsSpecial Point FeaturesBlowoutBorrow PitClay SpotClosed DepressionGravel PitGravelly SpotLandfillLava FlowMarsh or swampMine or QuarryMiscellaneous WaterPerennial WaterRock OutcropSaline SpotSandy SpotSeverely Eroded SpotSinkholeSlide or SlipSodic SpotSpoil AreaStony SpotVery Stony SpotWet SpotOtherSpecial Line FeaturesWater FeaturesStreams and CanalsTransportationRailsInterstate HighwaysUS RoutesMajor RoadsLocal RoadsBackgroundAerial PhotographyThe soil surveys that comprise your AOI were mapped at1:15,800.Warning: Soil Map may not be valid at this scale.Enlargement of maps beyond the scale of mapping can causemisunderstanding of the detail of mapping and accuracy of soilline placement. The maps do not show the small areas ofcontrasting soils that could have been shown at a more detailedscale.Please rely on the bar scale on each map sheet for mapmeasurements.Source of Map: Natural Resources Conservation ServiceWeb Soil Survey URL:Coordinate System: Web Mercator (EPSG:3857)Maps from the Web Soil Survey are based on the Web Mercatorprojection, which preserves direction and shape but distortsdistance and area. A projection that preserves area, such as theAlbers equal-area conic projection, should be used if moreaccurate calculations of distance or area are required.This product is generated from the USDA-NRCS certified data asof the version date(s) listed below.Soil Survey Area: Hamilton County, IndianaSurvey Area Data: Version 21, Jun 4, 2020Soil map units are labeled (as space allows) for map scales1:50,000 or larger.Date(s) aerial images were photographed: Aug 1, 2018—Sep30, 2018The orthophoto or other base map on which the soil lines werecompiled and digitized probably differs from the backgroundimagery displayed on these maps. As a result, some minorshifting of map unit boundaries may be evident.Soil Map—Hamilton County, IndianaNatural ResourcesConservation ServiceWeb Soil SurveyNational Cooperative Soil Survey7/18/2021Page 2 of 3 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI YmsB2 Miami silt loam-Urban land complex, 2 to 6 percent slopes, eroded 0.9 100.0% Totals for Area of Interest 0.9 100.0% Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 7/18/2021 Page 3 of 3 Undeveloped Land Curve Numbers Urban CN Table Page 10 of 120 NRCS HSG Table Urban CN Table 200-6 TABLE 201-2: Rainfall Intensities for Various Return Periods and Storm Durations Rainfall Intensity (Inches/Hour) Return Period (Years)Duration 2 5 10 25 50 100 5 Min. 4.63 5.43 6.12 7.17 8.09 9.12 10 Min. 3.95 4.63 5.22 6.12 6.90 7.78 15 Min. 3.44 4.03 4.55 5.33 6.01 6.77 20 Min. 3.04 3.56 4.02 4.71 5.31 5.99 30 Min. 2.46 2.88 3.25 3.81 4.29 4.84 40 Min. 2.05 2.41 2.71 3.18 3.59 4.05 50 Min. 1.76 2.06 2.33 2.73 3.07 3.47 1 Hr. 1.54 1.80 2.03 2.38 2.68 3.03 1.5 Hrs. 1.07 1.23 1.42 1.63 1.91 2.24 2 Hrs. 0.83 0.95 1.11 1.37 1.60 1.87 3 Hrs. 0.59 0.72 0.84 1.04 1.22 1.42 4 Hrs. 0.47 0.58 0.68 0.84 0.99 1.15 5 Hrs. 0.40 0.49 0.58 0.71 0.83 0.97 6 Hrs. 0.35 0.43 0.50 0.62 0.72 0.85 7 Hrs. 0.31 0.38 0.44 0.55 0.64 0.75 8 Hrs. 0.28 0.34 0.40 0.49 0.57 0.67 9 Hrs. 0.25 0.31 0.36 0.45 0.52 0.61 10 Hrs. 0.23 0.28 0.33 0.41 0.48 0.56 12 Hrs. 0.20 0.24 0.29 0.35 0.41 0.48 14 Hrs. 0.17 0.22 0.25 0.31 0.36 0.42 16 Hrs. 0.16 0.19 0.23 0.28 0.32 0.38 18 Hrs. 0.14 0.17 0.20 0.25 0.29 0.34 20 Hrs. 0.13 0.16 0.19 0.23 0.27 0.31 24 Hrs. 0.11 0.14 0.16 0.20 0.23 0.27 Source: Purdue,A.M., et. al., "Statistical Characteristics of Short Time Incremental Rainfall", Aug., 1992. (Values in this table are based on IDF equation and coefficients provided for Indianapolis, IN.) TABLE 201-3: Rainfall Depths for Various Return Periods Page 11 of 120 Exh. D Rainfall Depth (Inches) Return Period (Years)Duration 2 5 10 25 50 100 24 Hrs. 2.66 3.27 3.83 4.72 5.52 6.46 Source: Purdue,A.M., et. al., "Statistical Characteristics of Short Time Incremental Rainfall", Aug., 1992.(Values in this table are based on IDF equation and coefficients provided for Indianapolis, IN.) TABLE 201-4: NRCS Type 2 Rainfall Distribution Ordinates (for use when not already built in the computer program ) Cumulative Percent Cumulative Percent of Storm Depth Cumulative Percent Cumulative Percent of Storm Depthof Storm Time of Storm Time 0 0 52 73 4 1 53 75 10 2.5 54 77 15 4 55 78 20 6 56 80 25 85781 30 10 58 82 33 12 60 83.5 35 13 63 86 38 15 65 87 40 16.5 67 88 42 19 70 89.5 43 20 72 91 44 21 75 92 45 22 77 93 46 23 80 94 47 26 83 95 48 30 85 96 48.5 34 87 97 48.7 37 90 98 49 50 95 99 50 64 100 100 51 71 200-7 Page 12 of 120 Detention Model Schematic STORMWATER DETENTION MODEL 10 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Project Description UG Detention Model Rev 2.SPF Project Options CFS Elevation SCS TR-20 SCS TR-55 Hydrodynamic NO NO Analysis Options Jul 17, 2021 00:00:00 Jul 18, 2021 08:00:00 Jul 17, 2021 00:00:00 0 days 0 01:00:00 days hh:mm:ss 0 00:05:00 days hh:mm:ss 0 00:00:30 days hh:mm:ss 1 seconds 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) 1 Time Series 10_Yr Cumulative inches None None 10 3.83 SCS Type II 24-hr Runoff (Dry Weather) Time Step .............. Runoff (Wet Weather) Time Step ............. Reporting Time Step ................................ Routing Time Step .................................... Enable Overflow Ponding at Nodes ......... Skip Steady State Analysis Time Periods Start Analysis On ...................................... End Analysis On ....................................... Start Reporting On ................................... Antecedent Dry Days ............................... File Name ................................................. Flow Units ................................................. Elevation Type .......................................... Hydrology Method .................................... Time of Concentration (TOC) Method ...... Link Routing Method ................................ STORMWATER DETENTION MODEL 10 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022Subbasin Summary Subbasin Area Weighted Total Total Total Peak ID Curve Rainfall Runoff Runoff Runoff Number Volume (ac)(in)(in)(ac-in)(cfs) Ex_South_Basin 0.26 75.00 3.83 1.54 0.40 0.44 Pavement 0.02 98.00 3.83 3.27 0.06 0.10 Pool_Deck 0.05 98.00 3.83 3.58 0.18 0.26 Post_South_Basin 0.26 82.22 3.83 2.08 0.54 0.66 Roof 0.13 98.00 3.83 3.59 0.47 0.64 Turf 0.11 61.00 3.83 0.73 0.08 0.08 STORMWATER DETENTION MODEL 10 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022Node Summary Element Invert Ground/Rim Initial Peak Max HGL ID Elevation (Max)Water Inflow Elevation Elevation Elevation Attained (ft)(ft)(ft)(cfs)(ft) DS_East 845.44 847.00 845.44 0.00 845.44 DS_West 845.65 847.00 845.65 0.00 845.65 Deten_Out 843.00 0.42 843.35 Ex_Out 843.00 0.43 843.00 Post_Out 0.00 0.66 0.00 Storage 843.50 846.39 843.50 0.90 844.64 STORMWATER DETENTION MODEL 10 Year Design 241 1st Ave SEREV 3DATE: 09-Mar-2022Link SummaryElementFromTo (Outlet)LengthInletOutletAverageDiameter orManning'sPeakDesign FlowType(Inlet)NodeInvertInvertSlopeHeightRoughnessFlowCapacityNodeElevationElevation(ft)(ft)(ft)(%)(in)(cfs)(cfs)PipeDS_EastStorage144.00845.00844.000.69008.0000.01500.001.05PipeDS_WestStorage165.00845.00844.000.61008.0000.01500.001.05PipeStorageDeten_Out74.00843.50843.000.68004.2500.01300.280.18 STORMWATER DETENTION MODEL 10 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022Subbasin Hydrology Subbasin : Ex_South_Basin Input Data Area (ac) .........................................................................0.26 Peak Rate Factor ............................................................484.00 Weighted Curve Number .................................................75.00 Rain Gage ID ..................................................................* Composite Curve Number Area Soil Curve Soil/Surface Description (acres)Group Number 0.25_AC_Res 0.26 -75.00 Composite Area & Weighted CN 0.26 75.00 Time of Concentration TOC Method : SCS TR-55 Sheet Flow Equation : Tc = (0.007 * ((n * Lf)^0.8)) / ((P^0.5) * (Sf^0.4)) Where : Tc = Time of Concentration (hr) n = Manning's roughness Lf = Flow Length (ft) P = 2 yr, 24 hr Rainfall (inches) Sf = Slope (ft/ft) Shallow Concentrated Flow Equation : V = 16.1345 * (Sf^0.5) (unpaved surface) V = 20.3282 * (Sf^0.5) (paved surface) V = 15.0 * (Sf^0.5) (grassed waterway surface) V = 10.0 * (Sf^0.5) (nearly bare & untilled surface) V = 9.0 * (Sf^0.5) (cultivated straight rows surface) V = 7.0 * (Sf^0.5) (short grass pasture surface) V = 5.0 * (Sf^0.5) (woodland surface) V = 2.5 * (Sf^0.5) (forest w/heavy litter surface) Tc = (Lf / V) / (3600 sec/hr) Where: Tc = Time of Concentration (hr) Lf = Flow Length (ft) V = Velocity (ft/sec) Sf = Slope (ft/ft) Channel Flow Equation : V = (1.49 * (R^(2/3)) * (Sf^0.5)) / n R = Aq / Wp Tc = (Lf / V) / (3600 sec/hr) Where : Tc = Time of Concentration (hr) Lf = Flow Length (ft) R = Hydraulic Radius (ft) Aq = Flow Area (ft²) Wp = Wetted Perimeter (ft) V = Velocity (ft/sec) Sf = Slope (ft/ft) n = Manning's roughness STORMWATER DETENTION MODEL 10 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Subarea Subarea Subarea Sheet Flow Computations A B C Manning's Roughness :0.40 0.00 0.00 Flow Length (ft) :100 0.00 0.00 Slope (%) :3.5 0.00 0.00 2 yr, 24 hr Rainfall (in) :2.66 0.00 0.00 Velocity (ft/sec) :0.09 0.00 0.00 Computed Flow Time (min) :18.83 0.00 0.00 Subarea Subarea Subarea Shallow Concentrated Flow Computations A B C Flow Length (ft) :80 0.00 0.00 Slope (%) :3.5 0.00 0.00 Surface Type :Unpaved Unpaved Unpaved Velocity (ft/sec) :3.02 0.00 0.00 Computed Flow Time (min) :0.44 0.00 0.00 Total TOC (min) ..................19.27 Subbasin Runoff Results Total Rainfall (in) .............................................................3.83 Total Runoff (in) ..............................................................1.54 Peak Runoff (cfs) ............................................................0.44 Weighted Curve Number .................................................75.00 Time of Concentration (days hh:mm:ss) .........................0 00:19:16 STORMWATER DETENTION MODEL 10 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Subbasin : Pavement Input Data Area (ac) .........................................................................0.02 Peak Rate Factor ............................................................484.00 Weighted Curve Number .................................................98.00 Rain Gage ID ..................................................................* Composite Curve Number Area Soil Curve Soil/Surface Description (acres)Group Number Drive_Walk 0.02 B 98.00 Composite Area & Weighted CN 0.02 98.00 Time of Concentration User-Defined TOC override (minutes): 5 Subbasin Runoff Results Total Rainfall (in) .............................................................3.83 Total Runoff (in) ..............................................................3.27 Peak Runoff (cfs) ............................................................0.10 Weighted Curve Number .................................................98.00 Time of Concentration (days hh:mm:ss) .........................0 00:05:00 STORMWATER DETENTION MODEL 10 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Subbasin : Pool_Deck Input Data Area (ac) .........................................................................0.05 Peak Rate Factor ............................................................484.00 Weighted Curve Number .................................................98.00 Rain Gage ID ..................................................................* Composite Curve Number Area Soil Curve Soil/Surface Description (acres)Group Number -0.05 -98.00 Composite Area & Weighted CN 0.05 98.00 Time of Concentration User-Defined TOC override (minutes): 5 Subbasin Runoff Results Total Rainfall (in) .............................................................3.83 Total Runoff (in) ..............................................................3.58 Peak Runoff (cfs) ............................................................0.26 Weighted Curve Number .................................................98.00 Time of Concentration (days hh:mm:ss) .........................0 00:05:00 STORMWATER DETENTION MODEL 10 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Subbasin : Post_South_Basin Input Data Area (ac) .........................................................................0.26 Peak Rate Factor ............................................................484.00 Weighted Curve Number .................................................82.22 Rain Gage ID ..................................................................* Composite Curve Number Area Soil Curve Soil/Surface Description (acres)Group Number Impervious 0.15 B 98.00 Turf 0.11 B 61.00 Composite Area & Weighted CN 0.26 82.22 Time of Concentration User-Defined TOC override (minutes): 15 Subbasin Runoff Results Total Rainfall (in) .............................................................3.83 Total Runoff (in) ..............................................................2.08 Peak Runoff (cfs) ............................................................0.66 Weighted Curve Number .................................................82.22 Time of Concentration (days hh:mm:ss) .........................0 00:15:00 STORMWATER DETENTION MODEL 10 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Subbasin : Roof Input Data Area (ac) .........................................................................0.13 Peak Rate Factor ............................................................484.00 Weighted Curve Number .................................................98.00 Rain Gage ID ..................................................................* Composite Curve Number Area Soil Curve Soil/Surface Description (acres)Group Number House_Roof 0.13 -98.00 Composite Area & Weighted CN 0.13 98.00 Time of Concentration User-Defined TOC override (minutes): 5 Subbasin Runoff Results Total Rainfall (in) .............................................................3.83 Total Runoff (in) ..............................................................3.59 Peak Runoff (cfs) ............................................................0.64 Weighted Curve Number .................................................98.00 Time of Concentration (days hh:mm:ss) .........................0 00:05:00 STORMWATER DETENTION MODEL 10 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Subbasin : Turf Input Data Area (ac) .........................................................................0.11 Peak Rate Factor ............................................................484.00 Weighted Curve Number .................................................61.00 Rain Gage ID ..................................................................* Composite Curve Number Area Soil Curve Soil/Surface Description (acres)Group Number Turf 0.11 B 61.00 Composite Area & Weighted CN 0.11 61.00 Time of Concentration User-Defined TOC override (minutes): 15 Subbasin Runoff Results Total Rainfall (in) .............................................................3.83 Total Runoff (in) ..............................................................0.73 Peak Runoff (cfs) ............................................................0.08 Weighted Curve Number .................................................61.00 Time of Concentration (days hh:mm:ss) .........................0 00:15:00 STORMWATER DETENTION MODEL 10 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022Junction Input SN Element Invert Ground/Rim Ground/Rim Initial Initial ID Elevation (Max)(Max)Water Water Elevation Offset Elevation Depth (ft)(ft)(ft)(ft)(ft) 1 DS_East 845.44 847.00 1.56 845.44 0.00 2 DS_West 845.65 847.00 1.35 845.65 0.00 STORMWATER DETENTION MODEL 10 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022Junction Results SN Element Peak Peak Max HGL Max HGL Time of ID Inflow Lateral Elevation Depth Max HGL Inflow Attained Attained Occurrence (cfs)(cfs)(ft)(ft)(days hh:mm) 1 DS_East 0.00 0.00 845.44 0.00 0 00:00 2 DS_West 0.00 0.00 845.65 0.00 0 00:00 STORMWATER DETENTION MODEL 10 Year Design 241 1st Ave SEREV 3DATE: 09-Mar-2022Pipe InputSNElementLengthInletInletOutletOutletTotalAveragePipePipePipeManning'sEntranceExit/BendAdditionalInitialFlapNo. ofIDInvertInvertInvertInvertDropSlopeShapeDiameter orWidthRoughnessLossesLossesLossesFlowGateBarrelsElevationOffsetElevationOffsetHeight(ft)(ft)(ft)(ft)(ft)(ft)(%)(in)(in)(cfs)18in_East144.00845.00-0.44844.000.501.000.6900CIRCULAR8.0408.0400.01500.50000.50000.00000.00No128in_West165.00845.00-0.65844.000.501.000.6100CIRCULAR8.0408.0400.01500.50000.50000.00000.00No13Control_Pipe74.00843.500.00843.000.000.500.6800CIRCULAR4.2004.2000.01300.50000.50000.00000.00No1 STORMWATER DETENTION MODEL 10 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022Pipe Results SN Element Peak Time of Design Flow Peak Flow/Peak Flow Travel ID Flow Peak Flow Capacity Design Flow Velocity Time Occurrence Ratio (cfs)(days hh:mm)(cfs)(ft/sec)(min) 1 8in_East 0.00 0 00:00 1.05 0.00 0.00 2 8in_West 0.00 0 00:00 1.05 0.00 0.00 3 Control_Pipe 0.28 0 12:05 0.18 1.52 2.84 0.43 STORMWATER DETENTION MODEL 10 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022Storage Nodes Storage Node : Storage Input Data 843.50 846.39 2.89 843.50 0.00 0.00 0.00 Output Summary Results 0.90 0.90 0.28 0.00 844.64 1.14 843.58 0.08 0 12:05 0.000 0 0 0.00 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) ................................. Evaporation Loss ................................................... Peak Inflow (cfs) ..................................................... Peak Lateral Inflow (cfs) ......................................... Peak Outflow (cfs) .................................................. Peak Exfiltration Flow Rate (cfm) ........................... 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) .................................................... STORMWATER DETENTION MODEL 100 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Project Description UG Detention Model Rev 2.SPF Project Options CFS Elevation SCS TR-20 SCS TR-55 Hydrodynamic NO NO Analysis Options Jul 17, 2021 00:00:00 Jul 18, 2021 08:00:00 Jul 17, 2021 00:00:00 0 days 0 01:00:00 days hh:mm:ss 0 00:05:00 days hh:mm:ss 0 00:00:30 days hh:mm:ss 1 seconds 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) 1 Time Series 100_Yr Cumulative inches None None 100 6.46 SCS Type II 24-hr Runoff (Dry Weather) Time Step .............. Runoff (Wet Weather) Time Step ............. Reporting Time Step ................................ Routing Time Step .................................... Enable Overflow Ponding at Nodes ......... Skip Steady State Analysis Time Periods Start Analysis On ...................................... End Analysis On ....................................... Start Reporting On ................................... Antecedent Dry Days ............................... File Name ................................................. Flow Units ................................................. Elevation Type .......................................... Hydrology Method .................................... Time of Concentration (TOC) Method ...... Link Routing Method ................................ STORMWATER DETENTION MODEL 100 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Subbasin Summary Subbasin Area Weighted Total Total Total Peak ID Curve Rainfall Runoff Runoff Runoff Number Volume (ac)(in)(in)(ac-in)(cfs) Ex_South_Basin 0.26 75.00 6.46 3.68 0.95 1.05 Pavement 0.02 98.00 6.46 6.17 0.10 0.16 Pool_Deck 0.05 98.00 6.46 6.22 0.31 0.43 Post_South_Basin 0.26 82.22 6.46 4.44 1.14 1.39 Roof 0.13 98.00 6.46 6.22 0.81 1.09 Turf 0.11 61.00 6.46 2.32 0.25 0.31 STORMWATER DETENTION MODEL 100 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Node Summary Element Invert Ground/Rim Initial Peak Max HGL ID Elevation (Max)Water Inflow Elevation Elevation Elevation Attained (ft)(ft)(ft)(cfs)(ft) DS_East 845.44 847.00 845.44 0.29 846.03 DS_West 845.65 847.00 845.65 0.17 846.06 Deten_Out 843.00 0.80 843.35 Ex_Out 843.00 1.05 843.00 Post_Out 0.00 1.39 0.00 Storage 843.50 846.39 843.50 1.52 846.03 STORMWATER DETENTION MODEL 100 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Link Summary Element From To (Outlet)Length Inlet Outlet Average Diameter or Manning's Peak Design Flow Type (Inlet)Node Invert Invert Slope Height Roughness Flow Capacity Node Elevation Elevation (ft)(ft)(ft)(%)(in)(cfs)(cfs) Pipe DS_East Storage 144.00 845.00 844.00 0.6900 8.000 0.0150 0.29 1.05 Pipe DS_West Storage 165.00 845.00 844.00 0.6100 8.000 0.0150 0.17 1.05 Pipe Storage Deten_Out 74.00 843.50 843.00 0.6800 4.250 0.0130 0.40 0.18 STORMWATER DETENTION MODEL 100 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Subbasin Hydrology Subbasin : Ex_South_Basin Input Data Area (ac) .........................................................................0.26 Peak Rate Factor ............................................................484.00 Weighted Curve Number .................................................75.00 Rain Gage ID ..................................................................* Composite Curve Number Area Soil Curve Soil/Surface Description (acres)Group Number 0.25_AC_Res 0.26 -75.00 Composite Area & Weighted CN 0.26 75.00 Time of Concentration TOC Method : SCS TR-55 Sheet Flow Equation : Tc = (0.007 * ((n * Lf)^0.8)) / ((P^0.5) * (Sf^0.4)) Where : Tc = Time of Concentration (hr) n = Manning's roughness Lf = Flow Length (ft) P = 2 yr, 24 hr Rainfall (inches) Sf = Slope (ft/ft) Shallow Concentrated Flow Equation : V = 16.1345 * (Sf^0.5) (unpaved surface) V = 20.3282 * (Sf^0.5) (paved surface) V = 15.0 * (Sf^0.5) (grassed waterway surface) V = 10.0 * (Sf^0.5) (nearly bare & untilled surface) V = 9.0 * (Sf^0.5) (cultivated straight rows surface) V = 7.0 * (Sf^0.5) (short grass pasture surface) V = 5.0 * (Sf^0.5) (woodland surface) V = 2.5 * (Sf^0.5) (forest w/heavy litter surface) Tc = (Lf / V) / (3600 sec/hr) Where: Tc = Time of Concentration (hr) Lf = Flow Length (ft) V = Velocity (ft/sec) Sf = Slope (ft/ft) Channel Flow Equation : V = (1.49 * (R^(2/3)) * (Sf^0.5)) / n R = Aq / Wp Tc = (Lf / V) / (3600 sec/hr) Where : Tc = Time of Concentration (hr) Lf = Flow Length (ft) R = Hydraulic Radius (ft) Aq = Flow Area (ft²) Wp = Wetted Perimeter (ft) V = Velocity (ft/sec) Sf = Slope (ft/ft) n = Manning's roughness STORMWATER DETENTION MODEL 100 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Subarea Subarea Subarea Sheet Flow Computations A B C Manning's Roughness :0.40 0.00 0.00 Flow Length (ft) :100 0.00 0.00 Slope (%) :3.5 0.00 0.00 2 yr, 24 hr Rainfall (in) :2.66 0.00 0.00 Velocity (ft/sec) :0.09 0.00 0.00 Computed Flow Time (min) :18.83 0.00 0.00 Subarea Subarea Subarea Shallow Concentrated Flow Computations A B C Flow Length (ft) :80 0.00 0.00 Slope (%) :3.5 0.00 0.00 Surface Type :Unpaved Unpaved Unpaved Velocity (ft/sec) :3.02 0.00 0.00 Computed Flow Time (min) :0.44 0.00 0.00 Total TOC (min) ..................19.27 Subbasin Runoff Results Total Rainfall (in) .............................................................6.46 Total Runoff (in) ..............................................................3.68 Peak Runoff (cfs) ............................................................1.05 Weighted Curve Number .................................................75.00 Time of Concentration (days hh:mm:ss) .........................0 00:19:16 STORMWATER DETENTION MODEL 100 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Subbasin : Pavement Input Data Area (ac) .........................................................................0.02 Peak Rate Factor ............................................................484.00 Weighted Curve Number .................................................98.00 Rain Gage ID ..................................................................* Composite Curve Number Area Soil Curve Soil/Surface Description (acres)Group Number Drive_Walk 0.02 B 98.00 Composite Area & Weighted CN 0.02 98.00 Time of Concentration User-Defined TOC override (minutes): 5 Subbasin Runoff Results Total Rainfall (in) .............................................................6.46 Total Runoff (in) ..............................................................6.17 Peak Runoff (cfs) ............................................................0.16 Weighted Curve Number .................................................98.00 Time of Concentration (days hh:mm:ss) .........................0 00:05:00 STORMWATER DETENTION MODEL 100 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Subbasin : Pool_Deck Input Data Area (ac) .........................................................................0.05 Peak Rate Factor ............................................................484.00 Weighted Curve Number .................................................98.00 Rain Gage ID ..................................................................* Composite Curve Number Area Soil Curve Soil/Surface Description (acres)Group Number -0.05 -98.00 Composite Area & Weighted CN 0.05 98.00 Time of Concentration User-Defined TOC override (minutes): 5 Subbasin Runoff Results Total Rainfall (in) .............................................................6.46 Total Runoff (in) ..............................................................6.22 Peak Runoff (cfs) ............................................................0.43 Weighted Curve Number .................................................98.00 Time of Concentration (days hh:mm:ss) .........................0 00:05:00 STORMWATER DETENTION MODEL 100 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Subbasin : Post_South_Basin Input Data Area (ac) .........................................................................0.26 Peak Rate Factor ............................................................484.00 Weighted Curve Number .................................................82.22 Rain Gage ID ..................................................................* Composite Curve Number Area Soil Curve Soil/Surface Description (acres)Group Number Impervious 0.15 B 98.00 Turf 0.11 B 61.00 Composite Area & Weighted CN 0.26 82.22 Time of Concentration User-Defined TOC override (minutes): 15 Subbasin Runoff Results Total Rainfall (in) .............................................................6.46 Total Runoff (in) ..............................................................4.44 Peak Runoff (cfs) ............................................................1.39 Weighted Curve Number .................................................82.22 Time of Concentration (days hh:mm:ss) .........................0 00:15:00 STORMWATER DETENTION MODEL 100 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Subbasin : Roof Input Data Area (ac) .........................................................................0.13 Peak Rate Factor ............................................................484.00 Weighted Curve Number .................................................98.00 Rain Gage ID ..................................................................* Composite Curve Number Area Soil Curve Soil/Surface Description (acres)Group Number House_Roof 0.13 -98.00 Composite Area & Weighted CN 0.13 98.00 Time of Concentration User-Defined TOC override (minutes): 5 Subbasin Runoff Results Total Rainfall (in) .............................................................6.46 Total Runoff (in) ..............................................................6.22 Peak Runoff (cfs) ............................................................1.09 Weighted Curve Number .................................................98.00 Time of Concentration (days hh:mm:ss) .........................0 00:05:00 STORMWATER DETENTION MODEL 100 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Subbasin : Turf Input Data Area (ac) .........................................................................0.11 Peak Rate Factor ............................................................484.00 Weighted Curve Number .................................................61.00 Rain Gage ID ..................................................................* Composite Curve Number Area Soil Curve Soil/Surface Description (acres)Group Number Turf 0.11 B 61.00 Composite Area & Weighted CN 0.11 61.00 Time of Concentration User-Defined TOC override (minutes): 15 Subbasin Runoff Results Total Rainfall (in) .............................................................6.46 Total Runoff (in) ..............................................................2.32 Peak Runoff (cfs) ............................................................0.31 Weighted Curve Number .................................................61.00 Time of Concentration (days hh:mm:ss) .........................0 00:15:00 STORMWATER DETENTION MODEL 100 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Junction Input SN Element Invert Ground/Rim Ground/Rim Initial Initial ID Elevation (Max)(Max)Water Water Elevation Offset Elevation Depth (ft)(ft)(ft)(ft)(ft) 1 DS_East 845.44 847.00 1.56 845.44 0.00 2 DS_West 845.65 847.00 1.35 845.65 0.00 STORMWATER DETENTION MODEL 100 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Junction Results SN Element Peak Peak Max HGL Max HGL Time of ID Inflow Lateral Elevation Depth Max HGL Inflow Attained Attained Occurrence (cfs)(cfs)(ft)(ft)(days hh:mm) 1 DS_East 0.29 0.00 846.03 0.59 0 12:06 2 DS_West 0.17 0.00 846.06 0.41 0 12:05 STORMWATER DETENTION MODEL 100 Year Design 241 1st Ave SEREV 3DATE: 09-Mar-2022Pipe InputSNElementLengthInletInletOutletOutletTotalAveragePipePipePipeManning'sEntranceExit/BendAdditionalInitialFlapNo. ofIDInvertInvertInvertInvertDropSlopeShapeDiameter orWidthRoughnessLossesLossesLossesFlowGateBarrelsElevationOffsetElevationOffsetHeight(ft)(ft)(ft)(ft)(ft)(ft)(%)(in)(in)(cfs)18in_East144.00845.00-0.44844.000.501.000.6900CIRCULAR8.0408.0400.01500.50000.50000.00000.00No128in_West165.00845.00-0.65844.000.501.000.6100CIRCULAR8.0408.0400.01500.50000.50000.00000.00No13Control_Pipe74.00843.500.00843.000.000.500.6800CIRCULAR4.2004.2000.01300.50000.50000.00000.00No1 STORMWATER DETENTION MODEL 100 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Pipe Results SN Element Peak Time of Design Flow Peak Flow/Peak Flow Travel ID Flow Peak Flow Capacity Design Flow Velocity Time Occurrence Ratio (cfs)(days hh:mm)(cfs)(ft/sec)(min) 1 8in_East 0.29 0 12:02 1.05 0.28 1.08 2.22 2 8in_West 0.17 0 12:03 1.05 0.16 0.78 3.53 3 Control_Pipe 0.40 0 12:06 0.18 2.20 4.10 0.30 STORMWATER DETENTION MODEL 100 Year Design 241 1st Ave SE REV 3 DATE: 09-Mar-2022 Storage Nodes Storage Node : Storage Input Data 843.50 846.39 2.89 843.50 0.00 0.00 0.00 Output Summary Results 1.52 1.52 0.85 0.00 846.03 2.53 843.64 0.14 0 12:06 0.000 0 0 0.00 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) .............................. Evaporation Loss ................................................. Peak Inflow (cfs) .................................................. Peak Lateral Inflow (cfs) ...................................... Peak Outflow (cfs) ............................................... Peak Exfiltration Flow Rate (cfm) ........................ 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) .................................................