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Suwyig - Kim Stephens

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10 pages

English

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GETTING STARTED: A 3‐Scenario Tutorial for New Users Prepared for the Inter‐Governmental Partnership by RCL Consulting Ltd Preface This tutorial was prepared by a ‘new user’ for new users. Therefore, it is written from the perspective of someone who is trying the Water Balance Model for the first time. The tutorial leads the new user through the scenario comparison process that enables the user to assess the effectiveness of runoff volume reduction choices. The combination of this tutorial plus the information contained in the HELP icons should address most questions that the first‐time user may have about the model and the analytical process. Over time, and as users share their experiences in applying the Water Balance Model, the explanatory information is expected to evolve as may be needed to provide additional clarity. The Inter‐Governmental Partnership encourages other ‘new users’ to provide feedback and suggestions via outreach@waterbalance.ca Ted van der Gulik, Chair February 2009 GETTING STARTED: A 3‐Scenario Tutorial for New Users WATER BALANCE MODEL 3 SCENARIO TUTORIAL Introduction to modeling individual site scale rainwater management systems, intended to maintain pre development hydrology on a developed site ...

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Publié par	Suwyig
Nombre de lectures	30
Langue	English

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GETTINGSTARTED:A3‐ScenarioTutorialforNewUsers

PreparedfortheInter‐GovernmentalPartnershipbyRCLConsultingLtd

PrefaceThistutorialwaspreparedbya‘newuser’fornewusers.Therefore,itiswrittenfromtheperspectiveofsomeonewhoistryingtheWaterBalanceModelforthefirsttime.Thetutorialleadsthenewuserthroughthescenariocomparisonprocessthatenablestheusertoassesstheeffectivenessofrunoffvolumereductionchoices.ThecombinationofthistutorialplustheinformationcontainedintheHELPiconsshouldaddressmostquestionsthatthefirst‐timeusermayhaveaboutthemodelandtheanalyticalprocess.Overtime,andasuserssharetheirexperiencesinapplyingtheWaterBalanceModel,theexplanatoryinformationisexpectedtoevolveasmaybeneededtoprovideadditionalclarity.TheInter‐GovernmentalPartnershipencouragesother‘newusers’toprovidefeedbackandsuggestionsviaoutreach@waterbalance.caTedvanderGulik,ChairFebruary2009

GETTINGSTARTED:A3‐ScenarioTutorialforNewUsers

WATERBALANCEMODEL3SCENARIOTUTORIALIntroductiontomodelingindividualsitescalerainwatermanagementsystems,intendedtomaintainpredevelopmenthydrologyonadevelopedsite.

PREPAREDBYRCLCONSULTINGFROMORIGINALANDEXISTINGINSTRUCTIONMATERIALS

WATERBALANCEMODEL

GettingStarted

SettingUpaProject

3SCENARIOTUTORIAL

Thetabsonthebottomofthescreenwillguideyouthroughthemajorstepsofprojectdevelopment.Therearetwoparts,andtheyarelabeledPROJECTS(ontheleftside)andSCENARIOS(ontheright)Asafirst‐timeuser,youronlyoptionistoclickonNEWPROJECTtocreateyourfirstproject.Tobeginwith,wesuggestyoucreateanumberofsimplepracticeexamplestohelpyoubecomefamiliarandcomfortablewiththemodelanditscapabilitiesasadecisionsupporttool.

Afteryouhavecompletedyourfirstpracticerunortwo,youcanreturntothispageandDELETEyourinitialefforts.Onceyougainexperiencewiththemodelandknowhowtotuneittoyourneeds,youmaychoosetoEDITanexistingprojecttorefineyourwaterbalanceassessments.

CreateaNewProject

AfteryouselectaNEWPROJECT,ascreenpopsupthatasksyoutoCREATEANEWPROJECT.Thepop‐ uprequestsbasicinformationtodefineyourproject.Whenyoufillinthefirsttwoboxes,theNAMEofyourprojectandaBRIEFDESCRIPTION,pleasekeepinmindthatyoumaywishtocreatemultiplemodelruns.Developanappropriatenamingschemetohelpyourememberthepurposeorscopeofeachrun.

PREPAREDBYRCLCONSULTINGFROMORIGINALANDEXISTINGINSTRUCTIONMATERIALS

DECEMBER2008

YourfirstdecisionistoselectyourPROJECTTYPE.AsexplainedintheWaterBalanceModelCommunity‐of‐Interest,therearefourchoicesatthreescales:

SITE–Thiscouldbesituatedanywhereinthewatershed,isabasicbuildingblock,andrepresentswhathasbeenbroughtforwardfromtheoriginalWaterBalanceModel.

DEVELOPMENTAREAWITHOUTASTREAM ‐Thisisdefinedasaclusterofcontiguoussites(suchasasmallsubdivision),yetthereisnodirectdischargeofdrainageintoanearbystream.ThistypeofapplicationisalsorepresentativeoftheoriginalWaterBalanceModel.

 DEVELOPMENTAREAWITHASTREAM ‐Thisisdefinedasaclusterofcontiguoussites(suchasasmallsubdivision),ANDthereisdirectdischargeofdrainageintoastreamlocatedwithinthedevelopmentbecausethisconsideredsufficientformostscenariomodelingapplications.

ATERSHEDThisisdefinedasWWITHASTREAM– eitheramajordevelopmentwithinalargercatchmentorpartialdevelopmentofawatershed.Thiscouldbeaneighbourhood.Themodelcurrentlyallowsfortwocatchmentswithinawatershed.

WATERBALANCEMODEL

3SCENARIOTUTORIAL

Thenexttwoboxes,PROJECTLOCATIONandCLIMATEDATA,aredropdownsthatlinkyoutotheWaterBalanceModeldatabase.UnderPROJECTLOCATION,thereisalistingoftheRegionalDistrictsthatcomprisetheBritishColumbialandbase;andtheMemberMunicipalitieswithineachregionaldistrict.Thislistingservestwopurposes.First,itisanidentifierforyourmodelruns.Secondly,andthisisthevalue‐addedaspect,aselectionfromthisdropdownwillautomaticallypopulateyourmodelapplicationwithuniquelandusezoningandsoilinformationassociatedwithyourprojectlocation.

UnderCLIMATEDATA,thereisalistingofBritishColumbiaclimatestationscurrentlyavailableintheWaterBalanceModel.

Thefifthandsixthboxes,STARTDATEandENDDATE,areautomaticallygeneratedonceyouselectaClimateStationbasedontherangeofclimatedataavailable.YoualsohavetheoptiontochangetheStartandEnddatesshouldyouwishtoselectaspecificperiodoftimeforanalysis.Ifyoudothis,thereisaRESETbuttontorestoretheoriginalStartandEnddates.Pleasekeepinmindthattheresultsofmodelrunsprovideamoreaccuraterepresentationofthehydrologicsystemwhenlongertimeperiodsareused.

PREPAREDBYRCLCONSULTINGFROMORIGINALANDEXISTINGINSTRUCTIONMATERIALS

DECEMBER2008

ThelastboxistheMODELAREA.Thedropdownprovidesyouwithachoiceofmeasurementunits–imperialormetric.Fillinthetotalareaofyourproject,whetheritisanindividualsiteorawatershed.

Thebasicparametersofyourprojectarenowdefined.Thenextstepistoclick:CREATENEWPROJECT.Thiswilltakeyoutothesecondpop‐uptitledCREATEANEWSCENARIO.Ifyouwishtoabortthisrunforwhateverreason,simplyclickonCANCEL.

SCENARIO1

CreateaScenario

AfteryouCREATEANEWPROJECTascreenpopsupthatasksyoutoCREATEANEWSCENARIO.Ifthisisthefirstscenarioforyourproject,youwillbeaskedifit’sthebasecasescenarioForprojectslargerthanthesitescale,youwillalsobeaskedifthisscenarioincorporatesoff‐sitestorage.

WATERBALANCEMODEL

ConfigureDrainageArea

3SCENARIOTUTORIAL

Thesecondscreencomesup.Thedatainputsareconsolidatedonasinglescreensothatyoucan"build"yourprojectinmodulesandalwaysseeexactlywhereyouareintheprocess.

Inthetopleftcorner,undertheisthelabelDRAINAGEAREA:MODELLEDAREA.Totherightisthefirstmodulewhereyouenterthebasicstatisticsforyoursite,namely:LENGTH,ELEVATIONandSLOPE.

UnderneaththeseboxesisalinethatlistsNATIVESOILTYPES,LANDUSE,andSURFACECONDITION.Thinkoftheseasthebuildingblocksthatenableyoutoconfigureyourcatchment.

NowclickonADDNATIVESOILTYPEtoproceedtotheHydraulicPropertiescalculator.

AddNativeSoilTypes

AfteryouclickonADDNATIVESOILTYPE,ascreenpopsupandasksyoutoDESCRIBETHESOILCONDITIONS.YoudefinethenativesoilwiththehelpofanembeddedHydraulicPropertiescalculator.

PREPAREDBYRCLCONSULTINGFROMORIGINALANDEXISTINGINSTRUCTIONMATERIALS

DECEMBER2008

Thesitethatyouaremodelingmustbedividedintosub‐areasthathavesimilarsub‐surfaceconditions(e.g.nativesoiltypes,depthtogroundwatertable,depthtobedrock),andasetofsub‐surfacepropertiesmustbedefinedforeachsub‐area.ThepurposeoftheHydraulicPropertiescalculatoristogenerateSoilWaterCharacteristics.ThisinformationenablestheWaterBalanceModeltosimulatethewettinganddryingofthesub‐surfacelayer.

Placeyourcursoroverthetriangleandclickontheclassificationofsoilthatbestrepresentsyoursite.TheSoilWaterCharacteristicsareimmediatelyenteredbelowthetriangleunderCALCULATEDRESULTS.

TotheleftofthetrianglearethreesliderbarsthatallowyoutoadjusttheproportionofORGANICS,GRAVELandCOMPACTIONthatarecharacteristicofyoursite.

Intheabsenceofsite‐specificsoilstesting,applyyourbestguess.YoucanalwaysrunadditionalscenariostotestthesensitivityofyouranalysisasafunctionofSoilType.

Whenyouareready,clickonthetabtitledAPPLYTHISSOIL.ThistakesyoubacktotheCONFIGUREDRAINAGEAREASscreen.AmodulehasnowbeenaddedforNATIVESOILTYPES.Next,fillintheblanktheareaofthesitethatthissoiltypecomprises,andfillintheblankforthedepthofthesoillayer.Addadditionalsoiltypesiftheyexistindifferentareasofthesiteandadjusttheareaoccupiedbyeachsoiltypeuntilallareassumtothetotalareaofthesite.

WATERBALANCEMODEL

AddLandUse

3SCENARIOTUTORIAL

AfteryouclickonADDLANDUSE,ascreenpopsupwithachoiceofAVAILABLELANDUSESwhichhavepre‐proportionedsurfaceconditionsie.permeabletoimpermeablesurfaces,suchasbuildingspavement,forest,parketc.YoumayselectoneoftheseorDEFINENEWLANDUSEwhichwillbringupawindowallowingaNEWLANDUSEtobecreatedwiththedraganddropofAVAILABLESURFACECONDITIONSwhichthenneedtobeproportionedsothattheysumto100%.NowSAVELANDUSE,selectitfromtheAVAILABLELANDUSESandAPPLYLANDUSE.Additionallandusescanbeaddediftheyexistindifferentareasofthesiteandtheareaoccupiedbyeachisadjusteduntilallareassumtothetotalareaofthesite

SurfaceConditions

WhenyoureturntotheCONFIGUREDRAINAGEAREASscreenmoduleshavenowbeenaddedforLANDUSESandSURFACECONDITIONS.

YouwillseethatyoucanEDITand/orDELETELandUsesandSurfaceConditions.Toaddanewsurfacecondition,clickontheADDSURFACECONDITIONtabatthebottomofthescreen.ChooseoneoftheAVAILABLESURFACECONDITIONSorDEFINENEWSURFACECONDITIONinthesubsequentwindowwhenyouarereadyclickSAVENEWSURFACECONDITIONandAPPLYTHISSURFACECONDITION.ThenewSurfaceConditionwillbeaddedtotheCONFIGUREDRAINAGEAREAscreenandtheareasoccupiedbyeachsurfaceconditionwillneedtobeadjustedsoasumof100%ofthetotalsiteisachieved.

PREPAREDBYRCLCONSULTINGFROMORIGINALANDEXISTINGINSTRUCTIONMATERIALS

DECEMBER2008

Thisisagoodtimetoexperimentandgetcomfortablewithcustomizingyourmodelbymixingandmatchinglandusesandsurfaceconditions.

WaterBalanceReporting

AfteryouSAVEyourinputs,youarereadytoCHECKRESULTSforthebasecondition.Clickonthetabinthebottomrightcorner.Theresultsarepresentedonthreegraphs:EXCEEDANCE,VOLUMEandEROSION(ifastreamexists).

Insubsequentscenariosthatbuildonthisfoundation,youcanchooseCONFIGURESTREAM(ifapplicable)andCONFIGURESOURCECONTROLSscreenstoevaluatethepotentialeffectivenessofyourchoices.

TIPCreatethreescenarios,1)Pre‐ developmentsitei.e.treesand/orgrass,2)Post‐ developmentsitewithbuildings,pavement,andnosourcecontrols,i.e.noraingardensand,3)Post‐developmentsitewithsourcecontrols.

WithinWaterBalanceReportingviewthevolumerd summariessidebysideandtweakthe3scenariosourcecontrolsuntiltheredportionofthebargraph(totaldischargeie.runoff)isthesameorst slightlylessthanthe1scenario.Also,theexceedancecurveforpost‐developmentshouldcloselymatchthatofpre‐development.Thisprovidesagraphicalrepresentationofhow,throughtheuseofstormwatermanagementtechniques,thesiterunoffhasnotbeenincreasedduetodevelopment,whichisfundamentaltothehealthofstreamsandthenaturalrechargeofaquifers.4

WATERBALANCEMODEL

Scenario2

3SCENARIOTUTORIAL

ClickOPENPROJECTBROWSERtabonthelowerright,selectthecurrentproject,andselectyoufirstscenario.ThenCOPYSCENARIOandenteranappropriatenametorepresentScenario2,CREATECOPY.

FromtheCONFIGUREDRAINAGEAREASscreen,modifyLANDUSESandSURFACECONDITIONSsothattheyfittherequirementsofScenario2includeie.buildingsandimpervioussurfacessuchasimperviouspavementetcaswellassomegrassedareas,donotaddanysourcecontrols.SAVE,andCHECKRESULTS,noteofthedifferenceisrunoffbetweenscenarios1and2.

PREPAREDBYRCLCONSULTINGFROMORIGINALANDEXISTINGINSTRUCTIONMATERIALS

Scenario3

DECEMBER2008

ClickOPENPROJECTBROWSERtabonthelowerright,selectthecurrentproject,andselectscenario2.ThenCOPYSCENARIOandenteranappropriatenametorepresentScenario3,CREATECOPY.

DesignSourceControls

SurfaceEnhancements

Severalrainwaterrunoffvolumereductionmethods(or`LowImpactDevelopment`facilities)canbeassessedusingalteredcatchmentparametersdescribingthesurfaceconditionsofthecatchment.