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TechnicalMemorandum:Hydrologic&HydraulicStudyforTaylorBayou,HCFCUnitA1040000 <br />December13,2011 <br />Page5of6 <br />TaylorBayou,HCFCUnitA1040000,totheBayForestGolfCourse.Topographicdataforoverbank <br />areaswereobtainedfromLiDARDEMdata.ExistingbridgesandculvertsalongHCFCUnitA10400 <br />00andHCFCUnitA1041201weresurveyedandincludedintherevisedmodels.Theexisting <br />drainagestructuresarelistedinTable4. <br />Table4.ExistingDrainageStructures <br />ChannelRoadCrossingStructureTypeStructureDetails <br />TaylorBayou,HCFCUnitA1040000ShoreacresBlvdBridgeNoPiers <br />TaylorBayou,HCFCUnitA1040000McCabeRdCrossCulverts272"RCP <br />HCFCUnitA1041200ShadyRiverRdBridge218"Piers <br />HCFCUnitA1041201McCabeRdCrossCulverts272"RCP <br />Thecomputed10,50and100yearwatersurfaceelevationsalongTaylorBayou,HCFCUnitA104 <br />0000,areprovidedinTable5.Thecomputed10,50and100yearwatersurfaceelevationsalong <br />HCFCUnitA1041201areprovidedinTable6.TheextentoffloodingalongTaylorBayou,HCFC <br />UnitA1040000,andHCFCUnitA1041201forthe10,50and100yearstormeventsisshownin <br />Exhibit4.TheHECRASmodelfloodprofilesandoutputresultsareprovidedinAttachment2. <br />Table5.RevisedHECRASModelResultsforTaylorBayou,HCFCUnitA1040000 <br />RiverPeakFlow(cfs)WaterSurfaceElevation(feet)LowestGround <br />Station10Year50Year100Year10Year50Year100YearElevation(feet)* <br />316131040158118643.785.145.70 <br />3211961290710513.865.225.78 <br />3236359688310253.885.245.797.60 <br />329355608309673.985.315.867.80 <br />334855448069404.165.445.986.80 <br />341325257799084.445.706.227.40 <br />345525147618894.665.906.429.40 <br />350904997408645.006.176.66 <br />353144937318545.076.166.61 <br />35363McCabeRoad <br />354294917268496.7810.1511.39 <br />355404787088277.1610.5411.39 <br />361834126097117.2610.5811.42 <br />368683515186057.3510.6211.45 <br />Note:TheshadedareasrepresentthecrosssectionsalongtheShadyRiversSubdivision. <br />*GroundelevationatastructurelocationestimatedbasedonLiDARDEMData. <br /> <br />