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TechnicalMemorandum:Hydrologic&HydraulicStudyforTaylorBayou,HCFCUnitA1040000 <br />December13,2011 <br />Page4of6 <br />Table2.RevisedHECHMSModelPeakFlowsalongTaylorBayou,HCFCUnitA1040000 <br />DrainageLocation/DAPeakFlow(cfs) <br />Area/NodeDescription(acres)10Year50Year100Year <br />A104ASubareaUpstreamofSH146491.07351518605 <br />A104A1UpstreamofSH146491.07351518605 <br />A104A2FutureLakesatFairmontGreens231.25143213249 <br />A104A2USofMcCabeRoad704.32491726849 <br />A104A3SubareaWestofShadyRiverSubdivision91.0777113132 <br />A104A3AlongShadyRiverSubdivision795.39560830967 <br />A104A4ShadyRiverSubdivision57.34104143163 <br />A104A4TaylorBayou&HCFCUnit1041200confluence1332.16104015811864 <br />A104A9SubareaDownstreamofConfluence660.166419211069 <br />A1040000_236_JSH146NearPortRoad(Outfall)1992.32159323342760 <br />Note:Shadedareasrepresentdrainagenodeswithcumulativedrainageareasandflowsfromallupstreamareas. <br />SubareaA10407encompassesthedrainagearealocatedeastofSouthBroadwayStreet.TheCityof <br />LaPorteconstructedstormdrainageandoutfallimprovementsinvarioussubdivisionstodrainflows <br />fora5yearstormeventtoGalvestonBay.Therevisedhydrologicmodelincludesadiversionroutine <br />forSubareaA104A7basedonthecomputed5yearpeakflowforSubareaA104A7of210cfs.The <br />revisedHECHMSmodelresultsforHCFCUnitA1041201arelistedinTable3.TheHECHMSmodel <br />outputsummaryisprovidedinAttachment1. <br />Table3.RevisedHECHMSModelResultsalongHCFCUnitA1041201 <br />DrainageDAPeakFlow(cfs) <br />NodeDownstreamElement(acres)10Year50Year100Year <br />A104A5BayForestGolfCourse177.79229.3323.7373.5 <br />A104A5DownstreamofGolfCourse177.79229324374 <br />A104A6S.BroadwayStDrainageArea116.10119261299 <br />A104A7DrainageAreaEasttoS.BroadwaySt125.76253345393 <br />FlowsfromA104A7toA1041201 <br />After5yearFlow(210cfs)44135183 <br />DiversiontotheBay <br />A104A6AtBroadwayOutfall(NorthofShadyRiver)419.65443698832 <br />A104A8ShadyRiverSubdivision59.78108148169 <br />A104A4TaylorBayou&HCFCUnit1041200Confluence1332.16104015811864 <br />Note:Shadedareasrepresentdrainagenodeswithcumulativedrainageareasandflowsfromallupstreamareas. <br />RevisedHydraulic(HECRAS)Model <br />FieldsurveyswereperformedtoobtainchannelcrosssectionsalongHCFCUnitA1040000and <br />HCFCUnitA1041201.Fourteen(14)surveyedcrosssectionswereobtainedalongHCFCUnitA104 <br />0000.Eleven(11)surveyedcrosssectionswereobtainedalongHCFCUnitA1041201.The <br />surveyedcrosssectionlocationsareshowninExhibit3.TheFEMAeffectivehydraulic(HECRAS) <br />modelforTaylorBayou,HCFCUnitA1040000,wasextendedfromShoreacresBoulevardtoSH146. <br />Anewhydraulic(HECRAS)modelforHCFCUnitA1041201wasdevelopedfromitsconfluencewith <br /> <br />