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TechnicalMemorandum:Hydrologic&HydraulicStudyforTaylorBayou,HCFCUnitA1040000 <br />December13,2011 <br />Page2of6 <br />upperTaylorBayouwatershed;(2)developahydraulicmodelforHCFCUnitA1040000fromits <br />studylimitstoSH146;(3)determinethelimitsandsizeoftheproposedchannelimprovementsto <br />hydraulicallyconveya100yeardesignstormwithinchannelbanks;and,(4)locateandhydraulically <br />sizeamitigationpondvolumeandcontrolstructuretomitigateanydownstreamadverseimpacts <br />fromtheproposedchannelimprovements. <br />ScopeofWork <br />CivilTechEngineering,Inc.enteredintoanAgreementforProfessionalEngineeringServiceswiththe <br />CityofLaPorte,TexasonSeptember13,2011.Thedetailedscopeofworkisprovidedin <br />Attachment1oftheAgreement.Thescopeofworkincludesthefollowingtasks: <br />Task1:ProjectCoordinationandMeeting <br />Task2:DataCollectionandReview <br />Task3:HydrologicAnalysis <br />Task4:HydraulicAnalysis <br />Task5:MitigationAnalysis <br />Task6:ProjectEvaluation <br />Task7:StudyReport <br />ThescopeofworkalsoincludessurveyingservicesforHCFCUnitA1040000andHCFCUnitA104 <br />1201.SurveyingservicesarebeingprovidedbyCivilConcepts,Inc.TheCityofLaPortehasonly <br />authorizedTask1throughTask4andthesurveyingservices.Task5throughTask7willbe <br />authorizedpendingtherecommendationsinthistechnicalmemorandum. <br />SpecialFloodHazardAreas <br />TheShadyRiverSubdivisionislocatedentirelyintheFEMAregulatoryfloodplain,ZoneAE,asshown <br />intheFEMAFloodInsuranceRateMap(FIRM),MapNumbers48201C0945Land48201C1085L, <br />datedJune18,2007.TheFEMAFIRMisshowninExhibit2.ZoneAErepresentsareassubjectto <br />inundationbythe1%annualfloodevent(100year)withBaseFloodElevations(BFEs)determined <br />bydetailedmethods.ABFEof11feetisshownontheFEMAFIRMfortheShadyRiverSubdivision. <br />TheBFEwasdeterminedbasedoncoastalstormsurgemodelingforGalvestonBay.TheFEMAFlood <br />InsuranceStudy(FIS)listedthefollowingcoastalstormsurgeelevationsintheTaylorBayou <br />Watershed: <br />10%(10Year)BFE=4.8feet <br />2%(50Year)BFE=9.6feet <br />1%(100Year)BFE=11.4feet <br /> <br />