ML18031A306
| ML18031A306 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 11/13/1979 |
| From: | CURTIS N W PENNSYLVANIA POWER & LIGHT CO. |
| To: | SELLS D E Office of Nuclear Reactor Regulation |
| References | |
| PLA-421, NUDOCS 7911200521 | |
| Download: ML18031A306 (44) | |
Text
ACCESS[ohudRFAC[L:bn-587'503dc)AUTH~uAIHEctUris,u.<<.KEC[P~T)AT>>ESELLSgQ~E.~HE.GULAtv["iFGH..At[tituD[STRlduTIU.-~SYSTE,.(R[OS):1911200S21Ouc.Dare:79/11/13uur~RIZED:uuSusouenannaSteamElectricStationsUnitLPPennsylvaSusquenannaSteamElectricStation~Unit20PennsylvaAUT.iUKAFFIL.[Al'iuiuPennsvlvania)oT.er+LigntLo.REi:LP[E.'>>l'FiIL[[U<EnvironmentalHrojectsirancn2UUCKETI)5000561
SUBJECT:
For>erasresoonseto19L029requestforaaalinfotoco+ateteenvironrev>ewoflai0fIoaugmentationreservoir~PreliminarylistofaoorovalsppermitsKlicensesreouireatoconst4ooeratePonawillreservoirencl'10THI80TI04000':600IIICUPIEEPECEIvE0:LTH)EwCI.gEIIE:~lITLE:POLAR/FsAKAvoTsannReIatec)corresoonaencevuTEE:~gEtlAcrIU~:RECIP[E.'4rIOCDE)h/NAT)EnePi~P,L,KSC.Hate+aCOPIESL.rrkEVCLL110~EC[p[E)r[OCUI)E/4A'aEAl:~DOC5LAt084~COVLESLTTRElVCL00['~TERNAL:0REr[Lh,Ooc09GEOSC[EIVdR11<EcrlENGdH13MATLc,'4GdHANALYSISUR18AUXSYSHK20I8,CSYSBH22'AOSITETECr)27EFFLTRTSYS29KIRKhuuDADPLATVTSYSADS[rEAVLYSISHYPkOHETEUKBHi3ELDEXTERNAL:05LPOR50ACRS1144112211L11110111101021011101002<'RCPOH05UVERALICBH10QAdsTRucE.vGBRLSREACSYSBTcLTCOREFERFBfc19CUVTA[uSYS21Pd'hERSYSBR2bACCDIVTAiuLYS28RAGASIArdRAOiOKci)6AoHEACsAFE,rYD[RE,Ct'URT~HiiYiPA04VSIC1111L1.11111111L11110L001011gggg$979L.gpRJ4uR+3~BCpm'3-LRruTALNu).BEKoFCU)lesRE"u[RED:LTTR,~E,,uCL40 TWONORTHNINTHSTREET,ALLEN1'OWN,PA.18101PHONE:{215)8215151NORMANW.CURTISvicePrescentEngineering8Construction821.5381SOV13tS7OMr.DonaldE.Sells,ActingBranchChiefEnvironmentalProjectsBranchU.S.NuclearRegulatoryCommissonDivisionofSiteSafety8EnvironmentalAnalysisWashington,DC205SSSUSQUEHANNASESPONDHILLRESERVOIRINFORMATIONER100450FILE991-2PLA-421DOCKETNOS.50<<387AND50-388
DearMr.Sells:
TheinformationrequestedinyourletterofOctober29,1979iscontainedonAttachmentl.Apreliminarylistofapprovals,permitsand/orlicensesrequiredtoconstructandoperatethePondHillReservoirisincludedonAttachment2.Ifyouhaveadditionalquestions,pleasecontactittilliamBarberich(215-821-5833).Verytrulyyours,N.N.CurtisCopyto:Mr.PaulLeech(4copies)ilStopP522U.S.NuclearRegulatoryCommissionDr.JamesCarson(5copies)BuildingIlaDivisionofEnvironmentalImpactStudiesArgonneNationalLaboratoryArgonne,IL60439PENNSYLVANIAPOWERILLIGHTCOMPANYTgt,>SO~<RI3~/C=5rrri Attachment1AdditionalInformationRequestedforEnvironmentalReviewoftheLow-FlowAugmentationReservoirforSusquehannaSteamElectricStationDocketNos.50-387and50-388HdroloicEnineerin1.Provideadescriptionoftheone-percentchancefloodplainofPondHillCreekbefore,during,andaftertheconstructionofthereservoir.Includefloodinundationmapsforallconditions.Providedetailsofyourmethodsofanalyses.Includeyourassumptionsofandbasisforpertinentparameterssuchaslengthandslopeofdrainage.basins,timesofconcentration,infiltrationrates,rainfallamountsanddistribution,Manning's"n"values,andanyotherassumptionsorparametersusedinthedeterminationsofthefloodplains.Discussthealterationsofthefloodplain,includingthereachesdownstreamofthereservoir,thatwillresultfromtheproject.RESPONSE:TheattachedexcerptsfromhydrologicalstudiesforPondHillReservoirdetailthederivationoffloodhydrographsforPondHillCreekforconditionsbothbeforeandafterconstructioninthecasesofProbableMaximum,100,50and25yearfloods.ReservoirfloodroutingsforthePMFand100yearfloods(figures859)arealsoattached.Afloodinnundationmapshowingtheapproximateareawhichwouldbefloodedduringa100yearfloodbeforeconstructionofthedamisattached.Duringconstruction,floodflowswillbecontrolledbyacofferdamanddiversionreleaseswillbecontrolledtominimizedownstreamflooding.Aftertheprojectiscomplete,thereservoirdischargewill-beapproximately30cfswhichwillbepassedbytheexistingchannel.Becausetheexistingchannelwillpassthepeakdischargesforboththeduringandafterconstructionconditions,noinnundationmapshavebeenpreparedfortheseconditions.Inpreparingthefloodinnundationmap,floodflowswereassumednottoincreasedownstreamofthedam.AManning"n"valueof0.05wasassumedandachannelslope,basedonprojectmaps,rangingfrom3to10percentwasused.Noalterationofthefloodplaindownstreamofthedamisproaosed.
2.Provideadescription,includingafloodinundationmap,oftheonepercentchancefloodplainoftheSusquehannaRiverinthevicinityofthepumpingplant.Providedescriptionsoftherelationshipofallstructuresandconstructionactivitiestothefloodplain.Includemapsanddrawings.RESPONSE:The100yearfloodplainforadistanceofinexcessof3000feetupstreamandapproximately10,000feetdownstreamislargelyundevelopedontheeastsideoftheriverwithexceptionofseveralisolatedhouseswhichmaybeinthefloodplain.ThefloodplainisapproximatelyboundedontheeastbytheDelawareandHudsonRailroad.Thewestbankoftheriverwithinthesamelimitsalsocontainslittledevelopment.FloodprofilesandfloodboundaryandfloodwaymapsforConynghamTownship,LuzerneCountyinthevicinityofthepumoingplantareattached.TheyaretakenfromtheAugust1976FloodInsuranceStudyforConynghamTownship(U.S.DepartmentofHousingandUrbanDevelopment).Basedonthisdata,the100yearfloodplainelevationisapproximatelyEl.519atthepumpingplant.Theonlystructureproposedforconstructioninthefloodplainisthepumpingplant.TheproposedandtheapproximateextentofitsconstructioninthefloodplainisshownonplateS(attached).
Foranystructureschancefloodplain,floodplain'sfloodanalyses.Discussyourbasisforanyfloodplainarenotorconstructionactivitiesontheone-percentprovidedescriptionsoftheireffectsonthehandlingcapability.Includedetailsofyouralternatelocationsoffthefloodplainandprovideconclusionsthatalternatelocationsoffthepracticable.RESPONSE:TheproposedpumpingplantwouldbetheonlystructureintheSusquehannaRiverfloodplain.ThisstructurewillbelocatedapproximatelyatrivercrosssectionJasshownontheFloodProfilesandFloodBoundaryandFloodwaymaps(attached).FloodwaydataforthiscrosssectionfromtheFloodInsuranceStudyisalsoattached.BasedontheproposedpumpstationshowninPlate8,approximately600squarefeetofthestructurewouldencroachonthefloodplain.Becauseofthesteepslopeontheeastbankoftheriverat'thispointitisassumedthatthisentirewidthislocatedinthefloodwayasdefinedintheFloodInsuranceStudy.Ifitisconservativelyassumedthatnofloodwayfringeexistsonthewestbank,anduniformvelocitydistributionacrossthecrosssectionoccurs,thedepthofthe100yearfloodatthepumpstationisnotexpectedtoincreasemorthan0.6'600SF/948ft.floodwaywidth)duetoconstructionofthepumpstation.Itisexpectedthatthisincreaseinriverstagewouldnotextendveryfarupstreamduetotherelativelysteepfloodprofileinthisarea.Becauseoftheterraininthevicinityofthesite,thereisnolocationoutsidethefloodplainwhereapumpingplantcouldbeconstructedwithoutalteringthewaterconduitconceptorrelocatingfamiliesresidinginexistingdwellings.ThefloodplainextendstoapproximatelytheDelaware5HudsonRailroadtracksandarockcliffadjoinsRoute239totheeastinalllocationswhicharenotdeveloped,limitingtheareaavailableforpumpstationconstruction.
4.Provideadiscussionofthegroundwaterconditionsatthereservoirsitepriortoconstruction.Includeamapshowinggroundwatercontoursandlocatingallnearbywells.RESPONSE:Amapshowinggroundwaterelevationsatcompletedcoreboringsatthedamsiteandaseparatemapshowingnearbywellswheregroundwaterelevationshavebeenmeasuredisattached.Althoughnotlocated,mosthousesshownonthemaphaveindividualwells.Therearenowellswithintheproposedprojectboundary,andnearbywellarelocatedinsidethePondHillCreekdrainagebasin.Artesianpressurehasbeenobservedatseveraloftheboringsonthesouthabutment.Duetoalackofsufficientdata,nogroundwatercontourplanthasbeenprepared,however,groundwatercontoursappeartofollowsurfacecontoursintheimmediatereservoirarea.
5.Provideananalysistojustifyyourconclusiononpage4-4thatgroundwateralterationsthatwillresultfromthecreationofthereservoirwillbeconfinedtothebuffer"oneownedbyPPP<L.Includeamapshowinggroundwatercontoursexpectedafterthereservoirisfilledandequilibriumisreached.RESPONSE:Theconclusiononpage4-4isbasedonthesitegeology.Underlyingrockformationsdidabout45'othenorthintothereservoir.Theonlymajorfracturesarealongthebeddingplanes.Rockqualitybecomesverygoodbelowaweathered-oneofabout10feet.Permeabilitytestsindicatethatatabout90'epththerocktightensabruptly,andtheonlysignificantseepageisthroughthejointsintherock.Asthesejointsdipintothereservoir,significantseepageawayfromthereservoirisnotexpected.Becausethenaturalgroundwaterpathisintothereservoir,andbecause,basedonobservationstodate,thegroundwaterappearstogenerallyfollowthesurfacecontoursandagroundwaterdividehasbeenobservednearorabovethemaximumwaterstorageelevationonthesouthabutment,itisnotexpectedthatthegroundwateroutsidethePondHillCreekBasinwillbeeffected.PP5Lproposestoacquirealmostallthelandwithinthebasin.Becauseofalackofsufficientbasedata,nogroundwatercontourplanhasbeenprepared.
6.ProvideinformationonallpresentusesofPondHillCreek.Iftherearenone,sostate.RESPONSE:Ourinvestigationshaved'isclosednopresentusesofPondHillCreek.
7.Justifythechoiceof0.2cfsfortheconservationreleasetoPondHillCreekduringperiodsofdrawdownorrefillingofthereservoir.RESPONSE:ThePennsylvaniaDepartmentofEnvironmentalResources(DER)inthepermittingprocessnormallyincludesasoneoftheconditionstherequirementthatallnewreservoirsprovideaminimumreleasetomaintaindownstreamflows.Theminimumreleaserequirementisusuallytheaverageflowoverasevendaylowflowperiodwithareturninterimoftenyears(Q7-10).Intheabsenceofanystreamflowdata,avalueof0.15cfspersquaremileofstreamdrainageareaisnormallyutilizedbyDER.The0.15cfspersquaremilemultipliedbythedrainageareaatthedam(1.3squaremiles)isthebasisfortheproposedminimumflowof0.2cfs.RPN$979:5 ATTACHMENT2PreliminaryListofApprovals,PermitsorLicensesNeededforPondHillReservoirFederall.Intake5DischargeStructure,WaterWithdrawal--U.S.ArmyCorpsofEngineers(ACE)2.DredgingPermit--ACEState1.LimitedPowerPermit-DepartmentofEnvironmentalResources(DER)2.Intake5DischargePermit--DER3.ErosionandSedimentationControlPlan--DER4.NPDESDischargePermit--DERS.Roadcrossingsforpipeline,distributionlines,etc.--PADepartmentofTransportationInterstatePro'ectAroyal1.SRBC-WaterUsePermit PONDBILLRESERVOIRAPPENDXXAHYDROLOGY nitDu~r-APPE.'i'DZ.CAHYDROLOGYTABLEOPCO'.1TH:ITSDerivationofFloodHydrograahsUnitHydrograghsProbableMaximumRainfallProbablemaximumPloodNaturalConditionsReservoirConditions100-.YearPlood50-YearFlood25-YearFloodRecurrentFloodOperationStudyfor1964DroughtAccumulationofSedimentsPa<acA-1A-2A-6A-7A-10 HYDROLOGYZZST.OPPXGURESPiureNo.ProbableMaximumFloodHydroqragh,NaturalConditionsProbableMaximumFloodXnflo~Hydrogragh,ReservoirConditions100-YearFlood,NaturalConditions100-YearFlood,ReservoirConditions50-.YearFlood,NaturalConditions50~YearFlood,ReservoirConditions25=YearPlood,NaturalConditionsRecurrentFloodA-6A-8
~<<~~J<<V>>>>'Ji<<<<w~<<Ãiv~~~gr<<~t<<<<~.<<<<r<<<<<<~rive'ni4(1@a~JQ<<oc444l~>><<lie>>0talc.~v1'vi>>i+i'~>>vv>><<>>a~wc<<esa<aceC,i>><<V<<I<<~4>>ancusis<<aevarua>>cna~ac<<uo'ormalwatersu"plyLevelaf981.Inclucieda:(1)cier'va"ionoffloodhydragraphsfostormsofvariousfrecuencies;(2)detailsofthereservoirogera"ionstciyfortne1964"raugnŽperiod,and(3)estimatesofturesec'=ntaccu.=uLat'".".thereservoir.DerivationofFloodHydroraahsThepurposeofthispartoftheAppend'xistopse..ttheestimatesoffloodmagnitudestobeexpectedatcnePondHillsiteunciernaturalconditionsandaftercanstuc"ionaftheproposedreservair..Computationsnaveaeenmadefortheprobablemaximumflood(PNP),whichisthedes'gnoasisfordamstabilityancispillwaycapacityaalculationsandfarfloodstobeexpectedatrecurrenceintervalsof100,50,and25years.Asthereisnastream-flowmeasurementstationatthePandHillsite,itwasnecessarytoderivethevariousflaodhydrographsfromsyntheticunithydrogiagnsancidesignstormrainfalls.Ztisbelievedbasedonstudiesoffloodmagnitudesintheregionthatthederivedfloodmagnitudesareconserva-tive.Asthereservoirsurfaceareawillbeeauivalenttaabout39percentofthetotalcontributingarea,itwill"epossibletoobtainahighdegreeofsurchargestoragefamodificationofinflowfloods.Becauseofthisconc'tion,".".evolumeaftheinflowfloodwillbemoreimportantthanthepea<dischargeindetermining<<load.madificationbythereser;.oir.Althoughthereservoirhasahighpotentialfor:-ad'ationofin~lawfloods,itsexistencechangstrecharac=r'=--ticsofthetotalinrlowhycirograph,particular'yt'"i==arconcentrationofthecomponentareas.Thestorm.rainfallonone 4serOIQ~faffp8+p<<fspn1<<offth/<<QQ+If.lp~C<<OI~C0Ln<<<<wgirv-~ivi<<s<<i.a<<<<4~~Ieauk3aIso<<ra4n<<<<~~~cwaterarea-i.s"er"eiveda:.-,.osti..".sta.".=anecs;.ata<<<<<<timingoftheruroifrom'tnelandareas(theotherco.ponen)isalsochangedbytheexistencofthe~atrara.Toevalua"ethislattereffect,i"wasnecessarytodividethelandareaintotwosub-componentswhichdischar"edirct'yintothe<<arearea'nsteadoffollowingtheorigina'treamne"cworkasundernaturalconditions.Znsomeinstances,alargesurchargestoragevolumecouldleadtotheselec"ionofaspillwaycapacitywhichmightbetoosmallshouldasubsequentfloodoccurbeforethesurchargestoragefromaprecedingfloodhadbeendepleted.Topreventthis,arecurrentfloodwhichisassuagedtooccurtwodaysafterthepeakfloodlevelresultingfromtheprobablemaximumfloodisgenerallyusedtotesttheadequacyofthe.proposeddesign.Therecurrentfloodisalsoderivedherein.Unit2droaranhsAsstatedaboveitwasnecessarytoestablishtherunoffcharacteristicsofthetotalnaturaldrainageareaabovethedamsite,andofthetwocomponentareascontributingtothereservoir,byderivingsyntheticunithydrographs.Toobtainthenecessarycharacteristicsoftheunit.hydro-graphssuchaspeakdischarge,lagtimeandlengthofbase,theprocedurefortriangularhydrographanalysisproposedbytheU.S.BureauofReclamation(USBR)-wasfollowed.Unit1/hydrographscompiledbytheSusquehannaRiverBasinStudyCoordinatingCommittee-ortheSusquehannaRiver"asinl~"DesignofSmallDams",.BureauofReclamation,U.S.Oepart-mentoftheEnterior,2ndEdition,1973.2I"SusquehannaRverBasinStudy-AppendixD,Hycro'g'",SusquehannaRiverBasinStudyCoordinat'ngCommi"tee,June,1970.A;2
~~sellaht~owvaaaakLecaQaa,v4n&sdnUQJng0IVaL51QasI~~Asstudiesccnatinc'uaeanysmalldrainaceareaa.=the5unaerconsideratian(1.2Is=.;..'.)i"wasdeciaectauserneUSBRprocedurewnichallowstheuseofemg.iricaldatacompiledbytheSoilConservationServiceforverymalldrainagearas.ThestudyofdesignhydrographsayJ.E.AcSgaran-farPennsylvaniaNatersneds,whichincludedonedr'ainageareacP.2.4squaremiles,supgortstheuseoftheadoptedprocedure.Thetimeframthestartoftheunithydrograghtoitspeak(tinhours)isexpressedasfolLows:D+0.6T2where:D~Durationofexcessrainfallinhours;T~Timeofconcentrationinhourscofthewatersheddefinedasthetraveltimeofwaterframthemostdistantpointofthewater-shedtothegointofinterest.Theterm'.6TisanempiricalrelationshipdevelopedbytheSoilConservationServicetorepresentthelagtime,whichisdefinedasthetimeinhoursfromthe'idpointafexcessrainfall,D,tothetimeofpeakdischarge.Therelationdevelopedforthepeakdischarge(qP)oftheunithydrograpnincubicfeetpersecondpersquaremileisasfollows:Pp3~"DelawareRiverBasinEngineers,l960."DesignHydrog"'..".sNcSparran,Proce=.'-'ngReport,Vol.VX,AppendixM,CorpsoforPennsylvaniaHatersheds",Z.:-.ofASCE,Vol94,HoBY4,Julv196S.A3 Thetimebaseoftneunithydroccaph(tb,in-hours)isminedfromtneempi-'cal-e:ations.".i"s-L.67anato+ttowhere:tristherecessiontimeinhoursfromthepeaktotheendofthefloodhydrograpn.Thepeakofthe1-hourunithydrographforthe1.27squaremilesofnaturalareabasedontheaboverelationshipsis683cfsor538cfspersquaremile.Thepeakofthecombinedhydro-graphofthetwoareascontributingtothereservoir(totalareaof0.78squaremiLes)is559cfs.Asummaryoftheunithydrographcharacteristics.forbothconditionsfoLLows:Unit8drooraohCharacteristics~WithReservoirWithoutReservoirDrainageArea-sq.mi.DhoursTchourstphourstbhoursPeakDischargecfs0.781.00.360.72~20559l.27100.92~4683ProbableMaximumRainfallAsthedrainageareaabovethePondHilldamisLessthanLQsquaremiles,computedvalues.forpointrainfalLcanbeap-pliedtothetotalareaorsubareas.Furthermore,atotalstormdurationof6hoursisconsideredadequate,asincrementsora~fall'orLongerdurationswouldnotbesignificantinsiz-ingofthespillway.A6-hourdepthof25incheswasoreviouslyrecommendedfortheareaofinterest.-K,aterstudiesby5/5iT.chnicalPaperMo.40,Q.S.WeatherBureau,Hay'96L.A-4 theCorpsof=ng'neersrcommended"hatvalesor'ess".'".an'0squaremiesbereduced'"'0pecentinorertopcvce=ortneimperec"zt"ostor..isohyet'a"=ensto".".s'".peofa.particularbasin.The.assumeddistibutionandarrangementofthedesignrainfallwithinthe6-hourperiodisgivenbelow.Thedistributionisasrecommendedinthe"DesignorSmallDams."Thearrangementwassettoootainaconservativefloodpeak.Hour123456Depth(inches)229.83-21.61.620.0ProbableNaximumFloodNaturalConditions~TheprobablemaximumrainfallwasappliedtotheunithydrographforthePondHillReservoirdrainageareaundernaturalconditionsandthecomputationsareshownonFigureA-1.Thepeakdischargeis7,120cfs(5,600cfs/sq.mi.).ReservoirConditionsTheprobablemaximumrainfallwasappliedtothecombinedunitgraphforthe0.78squaremilelandareacontri-butingtothereservoirandtothe0.49squaremilewaterarea.Thepeakinflowfromthecombinedlandandwaterareais8,755cfs(6,892.cfs/sqmi.).Thepeakdischargefromthewaterareais36percentofthetotalpeakdischargewhichisinturn1.23timesthepeakdischargefromthenaturalareaandoccurs0.40 hours4.62963e-4 days <br />0.0111 hours <br />6.613757e-5 weeks <br />1.522e-5 months <br />sooner.hus,"he-porcancofevaluate.'.".gfloodsofc"aigrelat've'ylarge<<aearease~cs~~~L,.c'acaoThe.compgtat'northes"-'~waycesign=1"ocinlowundec..reservoirconditions.isshown'nFigureA-2.100-YearFloodThefloodwitharecurrenceintervaLofoncein100yearswasestimatedfrom.the6-hourrainfallfrequencydatagiveninTechnicalPaper40.Thetotal6-'hourdepthfortheregionofthereservoirwas5.0inches.TheassumeddistributionofrainfaLLwithintheperiodisasfolLows:Hour1235Depth~inches)0.30~0.702.500.650500.3S5.00AninfiltrationLossof0.1inchesperhourwasassumedforthestormperiod,givinganettotalrainfallexcessof4.4inches.ApplicationofthedesignstormtotheunithydrographresultsinapeakdischargeofL,756cfsundernaturalcondi-tionsandwiththereservoirthepeakdischargeis2,148cfs.ThecomputationsareshowninFiguresA-3and.A-450-YearFloodThefloodwitharecurrenceintervalofoncein50-yearswascomputedasexplainedaboveforthe100>>yearflood.T.".erainfallis4.3.inches,andwouldbedistributedasfollows:A-6 Sour123456Dept."a(neos)0.300;572.150.600.420.264.30Usinganinfiltrationlossof0.1inchperhour,andapplyingthedesignstormtotheappropriateunithydrographs,resultedinapeakdischargeof1,490cfsundernaturalcondi-tions,and1,832cfswiththereservoir.Thecompletecomputa-tionsareshowninFiguresA-5andA-6.25-YearFloodThefloodwitharecurrenceintervalofoncein25yearswithoutthereservoirwascomputed'sexplainedaboveforthe100-yearflood.Thetotaldepthforthe25-year6-hourrain-fallis4.0inches,distributedasfollows:Hour234.56Depth~inchaS0.240.562.000.520.400.264.00UsinganinfiltrationLossof01inchperhour,andapplyingtheresultingdesignstormtotheunithydragraphornaturalconditionsresultedinapeak.dischargeof1,387cfs.ThecompletehydrographisshownanFigureA-7.A7 Recurrent":LoodThecapacityofthePondHillReservoirspillwaywastestedbyroutingarecurrentfloodbeginningtwo..daysafterthepeakoutflowproducedbytheprobablemaximumflood.Therecurrentfloodwas'computedfromtheunithydrographandatotalrainfallthatisapproximatelyequaltotherecordrainfallfortheregion.Thetotalrainfalloftherecurrentstormwasestimatedbasedonafactorthatrelatestherainfallofrecordtothatoftheprobablemaximumstorm.Aspublishedinthe'DesignofSmallDams,"thefactorforthisregionis2.2.Theresultingrainfallof9.1incheswasdistributedasfollows:Hour123456Depth~inches0.734'6146.0.730.729.10ITherecurrentstormrainfallwasappliedtotheunithy-drographforthePondBillReservoirdrainageareaconsideingafullreservoir.Thecomputations'areshowninFigureA-8.
7IPONDHlLLREEERVO)RPROOAQLEHAXlHUIICBLOOD$4888NSIIRSGQRG-}147III48888811'7Iloof~~0.a..i-l!RIIHllHOURSII'lDROCRAP~IJDROCRlgHIIVDROSRAP~NIYDROGRAPIIJlVDROCRAPHHVDRO6RAPIII1YDROGRAPHIgfDROIIRAP+QYDROCRAPIIASTERORD!HAVEOADlHA'lEORDINATE4RDlHAlEORDlNA1EORDlNATEORDlHATE-ORDIHAlEORD1NATEElARY(ADiusvEolR~i.daR.2.2aR9.8aR3.20R1.60Ri.doREC.101Iff5)~5~C}S}ICI}Sf,CIIS,(CISIsffS~CI~Cf40.25114.182,n..a.a..a..o..o.-182.o'.sa303,'84.'0'~0~-0'P40.75493,788..~.I..D0~0~0.0n.788.t.i.oa683..io92.0.0~0.0.a..0.in92.I.so439.'02..IID.0'1.75317.'07~'084.u.o..a.n..n.1s91.2'aa+95'so2.o'.'..a.1814...:2.2573;116.1234.ii17.a.-o.0.0.2468'.50D,'~965'969.0..a..0.Q~39352.75D,04574831,0.0,~Jl552ll3.60.0.D.429.d493,000.a.n.7122...3'.2sa';.'..a..160.'497-364~0..-D,O.6n23.3.50.0,D'4302'49,...6.0,~5271.'s.'75'-a'"0.0.3104.1577.0.0.O.44II4.4'.oa0,0.0~19'11.218S0.0.n.4096.425.0115..1785.182..a6~4934.50a.a.,a.0.'14ad.'=484'.'..0.'889.4,'7s.a,0.0.Q.1014.7b8~0n.1805.00D'O.'2416920Jl17145.250,0.0.0.233.897.182.0.I'13.5.50a.'.a.0.0.702.4840.11S7.5.'750,0+0.'07.78S.0~2944'.ao0,a."0.:.'312..1D92.a..1404.6.250,0,0.a.116."897.o.1414.5.5~,.a.0.7o2.'.}o24.750.a.0a.0.'0."saz'.0.;'saz.7.oa0,00.0.0~~0.312~...0..312.z25~~aaD.0~}.s00."a.0..o.0.0.~0.0.0.
8I7POllDHlLlRESERV)ORP'ROSA)II.El7AlllUHFLOODMHPH~IIRERVOlR0D7lOIIShflER1ARU20u,oaC.SQi.2CI1.40~D1.to2.002.4u2.Ea'~93.ra3.23~43golcca~~ILi4,204.40~RCICJ4.vaS.UO~P~S.40s.ecd~44~44.do1~CIAUII11I'HORD)IIA)E(ADJU$7ED)NRORDlt;A7ER~i.dflHDROGRPHORD)HA7'ERI2209iSS9~54u04h94~ie40,d2eeoee425~,;~415~2d5.':-A255.0.E~0.11RER741.08Ci.',',,3dS.0.:.id2.a.a.0.0.0900a.0.0.a.00,0a.n.0~a.0~0O.8o.0a..00n0.000ann0~0.OdO..0O.n0.000~I0.0~00,0.n%%&a&&waa%RRN%eaaad%9699wwammra&&0~HYROGRAPHHVDROORPHHVDROGRAPHHVDROGRAPHHYDROGRAPHHYDROGAAPHORDllIA7E-OADlHAlEOADlHA7EORDlHA1EORDlNA7EORDlHA7ER~.Sll~Sll8llll~~dn8L0.7CfSI.,(CFS)..(CFS)(CFS)..(CFS)(CFS)&%%%&'W'%&%&99&%+%W&&W%Q&&WP&+A%%&W&&WW9WS0.508.110S..0~~0~O.SOR.1402.I...':::.'.0~.50..IGC7.0~..,'.30':,:I..O.:::.e99~1S42.o.o.a.o.699.20'47a..0~0..0,699.1895.n'0"0e99'440II..:..',"..'.:":0.'.:';0...5'114.'5dl.:."3d75.'.,-.,'.,:O.;'I,;.)'...'.;,...0..:...,3114.7154.??',~.?,0,.On3114~841?.0~a'..3114.e41e.2606dnkD07642316.,:."'-1200.::::.:0.'."-,-0.'..:.1016.3843.::225..'..;.;..'.176k..;.:,';",";.a.';-;.'.::.;.0..';:.:,=1cie.3530..,?'":"l?"-'??,?0,078.-0,0.1016.2095.0.0Si..3a4..O.saa.G~597500'nCnd.9639G.':.23I..'94.0~SIIR.1639a.ie..Ee4.0.SOR.13EE.37-0~0?l.1G470.0.425.30C.508.';1238.0..0.2es..dno.saa.1374..'7.4506~521-n..0,.:.8~86C506.1380.o.0.:.:a.539.Sah.1047.0~25.Q.4250.a..0..265.0.2es.0~0.o..11a.'.1)s.~ub00a.<0..a.:o.0.
9IPONDHE'LLRESER(0)R"':..e2.-."..I..i.::r.-.-;>>:A",4e..':.p'ein,e~ee:e7'l~O'A~j"':=.inn-YEARFLOODfUQ~lTWlAiRHPEFATUIOI~IFIFDTT1'G1HRUN)THOURSHYDRGGRAPHIIYDRGGRAPHHYDROGRAPHHYDROGRAPIIHYDRDGRAPHHYDROGRAPHHYDRDGRAI'HHTDROGRAPHHYDRCGQAPHXTTEO=OEO301T~EOIERT~ROXIQTEORXTIQTE0391IIRTE"ilR54IIX'TESIIOlaATAO'Ile'IOAIE"OAAIOATESTARTlADJUSTED)REOO20R490.60RA02.40RE90.55.RA50.40REO.25RES.EDT(CFS)CCES)(CES)CCES)(CES)(CESCCFS)(CFS)ECES)&'w\&eeo00.0.25114.220.'0303...'.40.O.i~93,.OS1.006S3..136'.25561.1120~0.O.0.0.~.0.0.0.0~0~0.0.0n.0~0.0~0.0.650~0.!1.75317.2.00195.2:2573.2.50Q.2.75~0.3.O~.3.250.350.0.3.750.4~00O.4.250.3.54.750.'.oo05.256.5.50n.5.750.KH6.250'.4'.50.O.0:77.000.?.250'.~~~63~5~295~.0.~0~.~0.~:.'.39~409.0.~0.'0.54.3XS.273.O.0.'0:0.2d3.727~0.0~0.0.190.1183.n.0.0.~'0"~'3'134de.'2:03""0':.'..:a.'nss'.tee,,0''.a.0.-74a.-.27t;-o.-0.,0.0.467'75.o.n'..a.tts'soe.'5.G.El.I21.,6.n..0.o.-".1?4..197.-0.0'.~0..10?..273.n.0~0.0.40."224.ES.0.0.~0.0..175.75.0~0.0.0.124.123.Ii.;170.00.0.'.291400.n.0.o.~n.109.~~a-.-a.0.0"."""0".',79.On0.0~n.~o.'a.00.n.O.0.is.nn22.0.60.96.0.0.0~0.136ian.269.359.448.0."624.0~990.0.13?3.1?SS.01452.0.1220.0;1031.F443529.0.n.O.3?1.0.'Ao.0:293.0n.n.251~250.248.169109.0.0790.n.4S.1b.0.0~42.
SO'IIDIlailtRESERVJORlNfLOMIIFDROGRAPHFULLRESERVO)RCONDlllOHSIIOUR$AflERORD)MATKORDlHAVEORD)HAYLORDlHATE.ORDlHATEORDINATEORDl4hlEARDlHA1EODD)NARKIIYDI7C?GRAPIIIIVDR0GRAPIIll>DR0CiRAPIIIIE0R0GRAPHH'NDR0GRAPIIO'FDR0GRAPIIIIYDR0GRAPIIIIYDROGRAPIIHYDR0GRAPH%%0%w&W&O%&&b.40u.4091.I33..331.20261.601.cn~97c.20:40C.4II3.43.'0403.404.05)4.2044.4,~sl4.:0IIO.uonirCdliesu560Cr4.40620~r0~n0.nt,4ilG,cn4ru0,Cs(CFS)(CSS)'CFS),<CFS)'lCFS)"'(CFS)'CFS)1'CFS)(CFS)Aw&%&%%&&%%%&%Arrear&Arran&&&%&w&rrAA&%IO&oArr&%&A+&Arr&wl&rw&&wAwA%&&&&&M~&&we&~a'a~0375~75,"0~.0..0~0.0,43.132.559~'11~"0~,'~~0~.'~.Ou63~'75.:d?.I..;:.0.;0..',-:.;.r.:,.,:9;::0.::,,I;:;..:;n.":.,:'3.330.6~.",.'53~:;".'::113~.....'.'.;0~.."I.q'"'0,,'5-.:3,I',:;:-':.;0~i'i',190.35?.74.34..335.a.o.n.a.190.sio..5,i.324.0.~:0,.0.O.190.515.029Q.392..0,-?0,:'.159'..:",.455..',v",,'!0;I,:1,".,;!0!I".-.I0'.:.':,,?li?.13720.'.'I,0,'.',99~:..899~::-'".r0.,".";.'-.;.I':0~':.;.';.',';0~;.."!","762..'7G2.~uU~0.'.1296.G.0.0.742.2041.0',0.0.'808.'C.0....762.CSV].ll,~0~~."-'.0~."',"3I::;.=0~~r.-.".-:.398~i394?=-,'.;Zj.206~C'.:429".:,I+:.'~~'.Ii.;;:.-'~rr.:1,,.'74~'.779~0.~,...,.';.:.00'....","..u.1.:'177.':;,';,";;",;".'.3070-"."'~;."..0.,".-.;i;:p.:,0.:".".::::.174.'59.227n.,.'744!I3.a.:.:,0,a.u.1os.o.o'.1?i.sda'.0.2,,.-O.'..146'.0~1273491r~50~?70~,0~'-'.:."~40~...'223~..".0~.-.127.'91.0...6~.000~..'~.-216.'.:.,-".0.127.45.0~3'~?7741I?0.0.II.10~47.79.I233.0.u..'..n.4693.79.'39.llt,.0~u..:2.3'...?9~21l.0..0.u..I;i..O.84.77.163.n,!'dQdeIo~~Cs.0.0.0..41.'.41.u.0.0~0..0~18.'0.18.Cs60~OJ~~I~0~,0.....,.0...0.,:0.,0.0.
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