stormwater PARTNERS

SW WASHINGTON

managing stormwater

An introduction to maintaining stormwater facilities

~ for private property owners and HOAs

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contentsstormwater maNaGemeNtIntroduction - rain and stormwater runoff . . . . . . . . . . 3

How stormwater facilities work . . . . . . . . . . . . . . . . . . . 3

maNaGiNG private stormwater facilities•Whoisresponsible? . . . . . . . . . . . . . . . . . . . . . . . . . . 5

•Doyouhaveastormwaterfacility? . . . . . . . . . . . . . . 5

•Talkingtoneighbors . . . . . . . . . . . . . . . . . . . . . . . . . . 5

•Costofmaintainingaprivatestormwaterfacility . . 6

•Guidelinesformaintainingprivatestormwater

facilities,anoverview . . . . . . . . . . . . . . . . . . . . . . . . . 6

How to recoGNize stormwater facilities . . . . . . . . . . 7

facilities maiNteNaNce GuideliNes

Swales•Biofiltrationswale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

•Filterstrip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Ponds•Detentionpond . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

•Infiltrationbasin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

•Wetpond . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

•Treatmentwetland . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Underground•Catchbasinandmanhole . . . . . . . . . . . . . . . . . . . . . . 17

•Drywell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

•Vaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Stormwaterfilter,vortexsedimentationvault,

closeddetentionsystem

tips for maNaGiNG stormwater at Home . . . . . . . . . 21

maiNteNaNce GuideliNes for busiNesses . . . . . . . . . . 22

Glossary of defiNitioNs . . . . . . . . . . . . . . . . . . . . . . . . 25

coNtacts aNd resources . . . . . . . . . . . . . . . . . . . . . . . . 27

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stormwater PARTNERS

SW WASHINGTONStormwaterPartnersofSWWashingtonisaconsortiuminvolvingClarkCountyandsixcities:BattleGround,Camas,LaCenter,Ridgefield,VancouverandWashougal.

Thepartnership,formedinlate2009,offersneighborhoodsandbusinessestechnicalinformationandguidancetomaintainprivatestormwaterfacilitiesandprotectourstreams.

Byworkingtogether,thecountyandcitiescombineresourcestoprovideacon-sistentmessagethatcrossesjurisdictionalboundariesandincreasestheprogram’soveralleffectiveness.

OriginallyfundedbyagrantfromtheWashingtonStateDepartmentofEcology,Stormwater Partners of SWWashingtonexpectstocontinuetheprogramaspartofourcom-munity’songoingemphasisoncontrollingandtreatingstormwaterpollution.

February 2011

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WegetalotofraininthePacificNorthwest.Rainbecomesstormwaterrunoffwhenitflowsoffroofs,yards,streetsandparkinglotsandintoourstreams,lakes,rivers,wetlandsandgroundwater.Asrunoffwashesoverthesesurfaces,itpicksupdirt,petwaste,litter,motoroilandahostofotherpollutantsanddumpsthemintonearbywaterways.

Stormwaterrunoffismanagedbychannelingitthroughspeciallybuiltlandscapedandstruc-turalfeaturescalledstormwaterfacilities.Theyremovepollutantsandslowstormwaterflowingintoourwaterways.Bothfunctionsarecriticaltoreducetheriskoffloodingandprotectthehealthofourstreams,lakes,wetlandsanddrinkingwater.Ponds,inlets,ditchesanddrainsarepartofourcommunity’sstormwatermanagementsystem.

Althoughsomestormwatertreatmentfacili-tiesmightbemaintainedbyyourcityorcounty,stormwaterfacilitiesoftenhaveprivateowners,includinghomeownerassociations(HOAs),whomustinspectandmaintainthem.Theseprivatefacilitiesmayservehousingdevelopments,schools,churches,commercialbuildingsandparkinglots.

Thisguidebookgivesanoverviewoffacilitiesyou or your association must maintain,tipsonhowtomaintainandfixthem,howtorecognizefacilitiesinyourdevelopment,whomtocontactwithquestionsandotherresources.

How stormwater facilities workSomefacilitiesaresimpleandsmall,suchasabio-filtrationswalewithmowedgrass.Othersarecom-plex,suchasasystemofpondsandundergroundstructures.Allaredesignedtocapturestormwaterandtreatit–usuallybycollectingitandfilteringcontaminants .

Collect and transport stormwaterStormwatersystemstypicallyconsistofcatchbasinsandpipesand/oropenchannels(ditches).Theyarelargeenoughtohandlerunofffrominfre-quent,largestorms.Typicalsystemfailuresincludereducedcapacitybecauseofcloggedgratesorpipesandorditchesblockedwithweedsordebris.Ifthecapacityoftheconveyancesystemisreduced,iso-latedfloodingandpropertydamagecanoccur.

Hold and reduce water flowSomefacilitiesdetainandslowtheflowofstorm-watertosurfacewaters.Roads,roofsandotherhardsurfacesincreasetherateofstormwaterrun-offintonaturalstreams,potentiallycausingstreamorchannelerosionandflooding.Detentionfacili-ties,suchaspondsandundergroundvaults,store

stormwatermanagement

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How to know if a facility is public or privateUnlessthereisasignthatsayswhoownsthefacility,thereisnoquickoruniver-salwaytotellifafacilityispublicorprivate.Generally,roadsideplantersandditchesorstormdrainsandpipeswithintherightofwayarepublic.Facilitieswithinprivatepropertiesare often,butnot always,private.

stormwaterforcontrolledreleaseandhelppreventdownstreamfloodinganderosion.

Store and treat runoffRetentionfacilities,suchasinfiltrationbasinsanddrywells,storeorretainrunofftemporarilywhileitsoaksintotheground.Thissystemmimicsnaturalprocessescausedbytrees,vegetationandmicrobesthathelpbreakdownandremovepollutants.Retentionfacilitiestypicallydonotreleasestorm-watertowaterways.

Multiple facility systemsStormwatertreatmentBestManagementPractices(BMPs)refertomultipleapproachestotreatandimprovewaterquality.Themostcommonincludeswalesandwetordryponds.Morecomplexsystemsincludeunder-groundvaultswithcar-tridgefiltersoroil/waterseparators.Allthesemethodshelpremoveoils,chemicals,met-als and sediment from stormwaterrunoffbeforeitisdischargedtogroundor surface water .

A well-maintained drywell has no debris or standing water. This photo shows water draining after a rain storm. The holes around the wall allow water to soak into the ground. See page 18 for more information about drywells.

coNfiNed space warNiNG for uNderGrouNd facilitiesDuetopotentialdangers,only

trainedpersonnelcanenterconfinedspaces. See page 20 for more information.

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maNaGiNG private stormwater facilities

Who is responsible?InwesternWashington,publicagenciesorprivatepropertyownersareresponsibleformaintainingstormwaterfacilities.Allfacilities,whetherpub-licorprivate,mustmeetthesamestateandlocalmaintenancerequirementsforpropercontrolandtreatment of stormwater runoff .

Homesbuiltbeforethe1980stypicallydraintopublicstreetsorroadsideditchesmaintainedbylocalgovernment.Innewerresidentialdevelop-ments,however,oneormorestormwaterfacilitiescouldbepartoftheinfrastructure.

Sinceatleastthe1980s,localjurisdictionshaverequiredsomeformofstormwatertreatmentasaconditionofdevelopment.Rulesbecamemorerigorousinthe1990sandnowstormwatertreat-mentssystemsmustbeinplacewhenimprovingorconstructingroads,parkinglots,buildingsandhomes.

Do you have a stormwater facility?Checkwithyourhomeownersassociationleader-shiporcityorcountypublicworksdepartmenttoseeifyourhousingdevelopmenthassuchafacility.Commercialandindustrialdevelopmentsalsoarerequiredtomaintainprivatestormwaterfacilities.

Ifyouliveinaresidentialdevelopmentwithaprivatefacility,yourHOAleadershipshouldhaveaccesstoinformationaboutthelocationsandtypesoffacilitiesservingyourpropertyaswellasamaintenanceplan.YourHOAduesmayhelppayforprivatestormwatersystemmaintenance.

IfyourresidentialdevelopmentdoesnothaveanHOA,ortheHOAhasnomentionofstormwatermanagement,here’showtochecktoseeifyouhaveanystormwaterfacilities:

• Lookforthisinformationinthenotesonyourrecordedplatofyoursubdivision,whichisusu-allyincludedwiththepaperworkyoureceived

whenclosingthepurchaseofyourhome.Or,lookinthe“Covenants,Conditions,andRestrictions”(CC&Rs)foryoursubdivision.

• Gotopage7toseeHow to recognize stormwa-ter facilities.

• Contactyourpublicworksdepartment(seepage27forcontactinformation)toaskaninspectortocheckyourhousingdevelopment.

Talking to neighborsInsomecases,homeownersdon’trealizetherearestormwaterfacilitiesintheirneighborhood.Thesitesoftenlooklikenaturalfeaturesormaynotbereadilyvisible.Youmightbesurprisedtolearnthereisafacilityintheneighborhood,letalonethathomeownersareresponsibleformaintainingit.

Informingyourneighborsaboutanexistingstormwatersystemandwhyit’simportanttoyourcommunityiscritical.Herearesomewaystohelp:

• Distribute flyersonstormwatermanagementtoyourHOAmembers

• Post informationtoyourcommunitywebsite

• Put a sign on the facility

• Discuss the issueatyourneighborhoodmeetings

• Invite a stormwater specialisttogiveapre-sentationtoyourmembersandleadatourofthefacility(seepage27forcontactinformation)

• Stencil friendly reminders near storm drains.Checkwithyourcityorcountyforpaints,stencilsandothersuppliestoas-sistneighborhoods,educationgroupsorothervolunteers.Stencilshelpothersunderstandthatalldrainseventuallyemptyintosurfaceorgroundwater

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• Show your neighbors picturesandexamplesofstormwatermanagementbestpracticesusedinothercommunities. See www.stormwaterpartners.com.

• Talk about the benefits a well maintained stormwatersystemprovides:moreattractiveneighborhoods,higherpropertyvalue,reducedpotentialforflooding,andprotectedstreamsandhabitats.

Cost of maintaining a private stormwater facilityIfproperlyconstructedandmaintained,residentialstormwaterfacilitiescanberelativelyinexpensivetokeepinproperworkingcondition.However,ma-jorrepairscanrequireprofessionalassistanceandbemuchmorecostly.Nearlyallfacilitieslikelywillneedsometypeofmajorserviceatsomepoint.

Propertyownersshouldsetasidemoneyforroutinemaintenanceaswellastheoccasionswhenoutsideexpertiseorequipmentisneededtomain-tain,upgradeorrepairasystem.Costsofmaintain-ingafacilitywillvarydependingonthelevelofmaintenance needed .

Guidelines for maintaining private stormwater facilitiesThebestwaytolimitbigrepairsandensurethatyourfacilitiesareworkingproperlyistofollowaregularinspectionandmaintenanceplan.Forsmall,simplefacilities,suchasbiofiltrationswales,muchofthemaintenancecanbedonebyneigh-borsorlandscapingfirms.Morecomplexfacilitiesrequireprofessionalmaintenanceandrepair.

Youshouldhaveacurrentmaintenanceplanforyourneighborhood’sstormwaterfacilities.AplanmightbeoutlinedinyourHOA’srecordsoryourCC&Rs.Ifneitherisavailable,amaintenanceplanmustbeformulated.Itshouldinclude:

• Ascheduleforroutinemaintenance

• Arecord-keepingsystemforinspectionsandmaintenanceactivities

• Maintenancestandardsandprocedures(suchasmowinggrassifhigherthan10inches,nostand-ingwater);see www.stormwaterpartners.com/ maintenance/checklists.html

• Designatedvolunteersand/orprofessionalsresponsibleforinspections.Somelocalagenciesroutinelyinspectprivatefacilities;askforacopyoftheinspectionreport.Seepage27forcontactinformation .

• Designatedvolunteersand/orprofessionalsresponsibleformaintenance

Managingyourstormwatersystemrequiresacombinationofsimpleroutinemaintenance,suchasrakingleavesandmowingandremovinggrassdebris.Asignificantamountoftheworkcanbedonebyneighborsorthosewhodoyourregulargroundskeeping.

Occasionally,acontractormayneedtobebroughtin.Forexample,forworkinginanunder-groundvaultorusingavacuumtrucktocleanacatchbasin,youshouldconsultaprofessionalwiththetoolsandtrainingtocompletethejobsafelyandcorrectly.Youshouldbesurethatyou,yourHOAandanyonehiredareproperlyinsured.

TheFacilities maintenance guidelines section (pages9-20)hasmoreinformationaboutstorm-waterfacilities,howeachworks,howtomaintainthemandhowtorecognizeproblems,aswellashintsabouthowtofixthem.

RemembeR:Tofullycomplywithlocallaws,youneedtocheckthemaintenancemanualforyourarea(seepage27forlocalagencycontacts).Itcontainscompre-hensivelistsforrecognizingpotentialproblemsandhowtomaintainfacilities.Youalsocanfindthemanualsonlineatwww.stormwaterpartners.com /resources.html.

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How to recoGNize stormwater facilitiesYourhomeownersassociationshouldhaveaccesstoinformationaboutthelocationsandtypesoffacilitiesservingyourproperty.Ifthefacilityispri-vatelymaintained,theassociationalsoshouldhaveamaintenanceplan.

Ifyourresidentialdevelopmentdoesnothaveahomeownersassociationorassociationdocumentshavenomentionofstormwatermanagement,lookforinformationaboutlocationsandtypesof

facilitiesontherecordedplatforyoursubdivi-sionorinyourpropertydeedunder“Covenants,Conditions,andRestrictions.”(CC&Rs).

Thepicturesanddescriptionsbelowshouldhelpyourecognizestormwaterfacilities.Somehavefencesaroundthemforsafety,especiallythosewithstandingwater.Ifthefacilitieshaveproblems,however,identificationcanbedifficult.

Formoreinformationaboutfacilitiesinyourdevelopment,contactyourlocalagency(seepage27)andaskastormwaterinspectortovisit.

Dry facilitiesDrymostofthetime,thesefacilitiescontainwaterduringandafterrainstorms.Watershoulddisap-pearwithinthreedaysaftertherainstops.

recognizeyourfacility

Detention pond (page 11) Stormwater is tempo-rarily stored and slowly released through an outlet pipe. Natural-appearing vegetation is common.

Filter strip (page 9) is a strip of grass along paved areas such as a road or parking lot. Contaminants are filtered out of the water as it flows away.

Infiltration basin (page 12) is an open basin that holds water while it soaks into the ground.

Biofiltration swale (page 9) is a flat-bottomed channel where pollutants are removed by filtration, infiltration and settling.

continued on the next page

Underground facilities and structuresUndergroundcatchbasins/stormdrains,man-holes,vaultsanddrywellsareinvisibleexceptforamanholecoverorinletgrate.

Wet facilitiesThesefacilitiestypicallycontainwateryear-roundandoftenhavesignificantaquaticvegetation.Waterlevelscouldriseduringastorm,butshouldnotbreachthestructure.

Drywell (page 18) Vault (page 19)

Catch basins (also called curb inlets or storm drains - see page 17)

Underground structures are used to trap sediment and debris, allowing storm-water to soak into the ground and filter pollutants. They are used as a junction between pipes to route stormwater.

Wetpond (page 13) is an open basin with a per-manent pool of water that is often combined with a detention pond. Sediment and pollutants settle to the bottom. .

Treatment wetland (page 14) is a shallow pond that uses dense wetland vegetation and settling to filter sediment and oily materials. It can provide wildlife habitat.

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biofiltratioNAbiofiltrationswaleusesgrassorotherdenseplantstofilteroutsedimentandoilymaterials.Swalesoftenlooklikeflat-bottomedchannelswithgrassgrowinginthem.Aswaleisusuallydry,butafterastorm,therunoffmovesthroughitslowlyandatashallowdepth.Asstormwaterpassesthroughtheplants,pollutantsareremovedbythecombinedeffectsoffiltration,infiltration,andsettling.Anystandingwatershoulddrainfairlyquickly.

Biofiltrationswalesprovidetreatmentforpollu-tionbutdonotcontroltheamountofstormwaterpassingthroughthem.

filter stripAfilterstripisastraightswatchofgrassthatre-movessedimentandoilsfromstormwater.Usually,filterstripsarealongedgesofpavedareassuchaspark-inglotsandroads.

For signs that maintenance is needed,tipsonhowtofixproblems,andgeneralmaintenanceguidelines,seethenextpage.

swales

SWALES

GOOD: Well maintained biofiltration swale.

PROBLEM: Noxious weeds have taken over this biofiltration swale.

PROBLEM: This trap needs cleaning.

Additional elements to swales:

FiELD inLETAfieldinletisaconcretestructurethatcollectsstormwaterandroutesitthroughundergroundpipes.Fittedwithaslanted,slottedgrate,itof-

tentrapssedimentanddebris.Regularmaintenanceisimpor-tant.Keeptheopeningclearofobstructions.Afieldinletisusuallycleanedbyatruckwithavacuumhosebutsometimescanbecleanedwithhandtools.

SEDiMEnT TrAPAsedimenttrapisacon-cretestructurefittedwithaslottedgrateormultipleslottedgrates(debrisbarri-ers).Storageareabelowtheoutletpipeallowssedimentanddebristosettleoutofthestormwaterrunoff. Regularmaintenanceis importanttoremovetrash, vegetationandsedimentbuildup.

MAinTEnAnCE GUiDELinES

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tips for fixiNG problems and general maintenanceVegetation

• RemoveweedssuchasblackberriesandEnglishivy,thencheckforthemonaregularbasisandremovenewvines.

• Removealltreesandsaplingsthatblockfacilityelements .

• Mowgrassasneededtokeepheightat4to6inches;removeclippings.

• Replacevegetationdamagedorremovedduringmaintenance .

• Avoidusingfertilizers,herbicidesorpesticideswithinornearthefacility.Thesechemicalspol-lutethewaterandcancauseunwantedplantgrowth.

Erosion

• Controlbyreseedingareaswheresoilisexposed,especiallyonslopes.

• Fillinerodedareasandseedwithgrass.

Sediment

• Removingsedimentisbestdoneindrymonthsbeforewinterrainssetin.

• Ifneeded,seedandwaterduringdrymonthstore-establishgrass.

Trash and debris

• Pickupleavesbeforerainsbegin.

• Inspectandremovedebrisregularly,particularlyafter storms .

• Removeanymaterialcloggingdrains,outfallsandchannels.

Fencing and access lanes

• Checkroadsandfencinginthefacility.Theyshouldbemaintainedtoalloweasyaccess.

maiNteNaNce is Needed if you see these signs• Bare,exposedsoil

• Cloggedinletandoutletpipes

• Bottomofswaleiseroded

• Sedimentbuildup,usuallynearinlet

• Unhealthyordeadvegetation

• Blackberriesorotherproblemvegetation

• Overgrownvegetation

• Leaves,trashandotherdebris

swales

SWAL

ES

GOOD: A biofiltration swale showing a sediment trap in the foreground.

MAinTEnAnCE GUiDELinES

deteNtioN poNdAstormwaterdetentionpondisanopenbasinbuiltbyexcavatingbelowgroundorconstructingabove-groundbermsorembank-ments.Thedetentionpondtemporarilystoresstormwaterrunoffandslowlyreleasesitthroughaspeciallydesignedoutletorcontrolstructure.Detentionpondstypicallyaredesignedtodraincom-pletelywithinafewhoursordays.Stylesvarygreatly,fromwellmanicuredtonaturalappearing.Generally,morenatural-appearingvegetationispreferredforreducedmaintenanceandenhancedwild-lifehabitat.Somefacilitiesaredesignedtoappearasnaturalwaterbodiesorpark-likeareas.

For signs that maintenance is needed,tipsonhowtofixproblems,andgeneralmainte-nanceguidelines,seepage15.

ponds

POnDS

GOOD: Both photos show well maintained deten-tion ponds. Shortly after a rain storm, the pool of water, above, is slowly draining. On the left, the pond is dry between storms.

MAinTEnAnCE GUiDELinES

Additional elements to detention pond facilities:

FiELD inLETAfieldinletisaconcretestructurethatcollectsstormwaterandroutesitthroughundergroundpipes.Fittedwithaslanted,slottedgrate,itoftentrapssedimentanddebris.Regularmaintenanceisimpor-tant.Keeptheopeningclearofobstruc-tions.Afieldinletisusuallycleanedbyatruckwithavacuumhosebutsometimes

canbecleanedwithhandtools.

FLOW COnTrOL STrUCTUrE/FLOW rESTriCTOrUndergroundflowcontrolstructuresandflowrestrictorsdirectorrestrictflowinoroutoffacilities.Theyslowlyrelease

stormwaterataspecificrate.Itisimportanttomakesuretheydonotbecomepluggedordamagedbecausethefacilitycouldreleasewatertooquicklyortooslowlyandoverflow.Theyareusuallyfoundinmanholes.

DEbriS AnD ACCESS bArriErAdebrisoraccessbarrierisabargrateovertheopenendofapipelargerthan18inchesindiam-eterthatpreventslargematerial,peopleoranimalsfromentering.Theytypicallyarelocatedontheoutletpipefromadetentionpondtothecontrolstructure .

Forsafetypurposes,onlyqualifiedpersonnelshouldremovedebrisfromthebarrierwhenwaterisflowingthroughthepipe.

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iNfiltratioN basiNAstormwaterinfiltrationbasinholdsrunoffandletsitsoakintotheground.Thebasinsareopenfacilitieswithgrassorsandbases.Theycaneitherdrainrapidlyoractaspermanentpondswherewaterlevelsriseandfallwithstormwaterflows.Infiltrationfacilitiescanbedesignedtohandleallrunofffromatypicalstormbutcouldoverflowinalargerone.Sincethefacilityisdesignedtosoakwaterintotheground,anythingthatcanclogthebasewillreduceperformanceandbeaconcern.Generally,infiltrationbasinsaremanagedlikedetentionpondsbutwithgreateremphasisonmaintainingtheabilitytoinfiltratestormwater.

ponds

For signs that maintenance is needed,tipsonhowtofixproblems,andgeneralmaintenanceguidelines,seepage15.

GOOD: Above shows a dry infiltration basin. Unlike a detention pond, an infiltration basin has an un-derground structure that helps water soak into the ground. Below is a good basin shortly after a rain storm.

MAinTEnAnCE GUiDELinESPO

nDS

Additional elements to wetponds:

FiELD inLETAfieldinletisaconcretestructurethatcollectsstormwaterandroutesitthroughundergroundpipes.Fittedwithaslanted,slottedgrate,itoftentrapssedimentanddebris.Regularmaintenanceisimportant.Keeptheopeningclearofobstructions.Afieldinletisusuallycleanedbyatruckwithavacuumhosebutsometimescanbe

cleanedwithhandtools.

FLOW COnTrOL STrUCTUrE/FLOW rESTriCTOrUndergroundflowcontrolstruc-turesandflowrestrictorsdirectorrestrictflowinoroutoffacilities.Theyslowlyreleasestormwaterat

aspecificrate.Itisimportanttomakesuretheydonotbecomepluggedordamagedbecausethefacil-itycouldreleasewatertooquicklyortooslowlyandoverflow.Theyareusuallyfoundinmanholes.

DEbriS AnD ACCESS bArriErAdebrisoraccessbarrierisabargrateovertheopenendofapipelargerthan18inchesindiam-eterthatpreventslargematerial,peopleoranimalsfromentering.Theytypicallyarelocatedontheoutletpipefromadetentionpondtothecontrolstructure .

Forsafetypurposes,onlyqualifiedperson-nelshouldremovedebrisfromthebarrierwhenwaterisflowingthroughthepipe.

wetpoNdAwetpond,orwetpool,isanopenbasinthathasapoolofwateryear-round.Thevolumeofthewet-pondallowssedimenttosettleoutasstormwaterrunsin.Wetlandvegetationistypicallyplantedtoprovideadditionaltreatmentbyremovingnutri-entssuchasphosphorusandnitrogen.

Typically,therearetwopools.Stormwaterflowsintothefirstpool,wheresedimentsettlesbeforemovingintothesecondpool.Thewateristhendischargedtostreamsandgroundwater.

Wetpondsalsohaveadditionaltemporarystor-ageabovethepermanentwaterleveltodetainandslowlyreleasestormwater.Theyoftenarefencedforsafety.

ponds

POnDS

For signs that maintenance is needed,tipsonhowtofixproblems,andgeneralmaintenanceguidelines,seepage15.

GOOD: Well maintained examples of wetponds. Above shows a two-pool wetpond.

MAinTEnAnCE GUiDELinES

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treatmeNt wetlaNdAstormwatertreatmentwetlandisashallowman-madeponddesignedtotreatstormwaterthroughthebiologicalprocessesassociatedwithaquaticplants.Thesefacilitiesusedensewetlandvegeta-tionandsettlingtofiltersedimentandoilymateri-als out of stormwater .

Wetlandstakeadvantageofnature’sap-proachtoremovingpollutants.Theyalsoprovidehabitatforamphibians,aquaticinsectsandbirds.Vegetationoccasionallymaybeharvestedandsedimentremoved,primarilytomaintaintheoriginalstoragecapacityofthewetland.Ingeneral,

ponds

POnD

S

For signs that maintenance is needed,tipsonhowtofixproblems,andsomegeneralmainte-nanceguidelines,seethenextpage.

stormwaterwetlandsdoagoodjobofremovingsediment,metalsandpollutants.

Treatmentwetlandsneedtobemaintainedtostormwaterfacilitystandardstoavoidredes-ignationasanaturalwetland,wherepermitsarerequiredformaintenancework.

MAinTEnAnCE GUiDELinES

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maiNteNaNce is Needed if you see these signs• Bare,exposedsoil

• Slopesthataredeteriorating

• Sedimentthatrestrictsfloworclogsinletandoutletpipes

• Sedimentbuildup;thefacilityisnotdrainingorconveyingrunoff

• Unhealthyordeadvegetation

• Blackberriesorotherproblemweeds

• Overgrownvegetation

• Holesinbermsorslopes

• Leaves,trashandotherdebris

• Watersurfaceisdiscoloredorhasasheen

• Waterstandsininfiltrationbasinsordetentionpondslongerthan72hoursafterrainstops

• Bottomsofslopesshowsignsofseepageandleaking

• Trees,oftenalders,growingontheslopes

tips for fixiNG problems and general maintenanceVegetation

• Completelyremoveinvasivespecies,suchasblackberriesandEnglishivy;checkonaregularbasistoremovenewvines.

• Removecattailsbeforetheystarttodominateafacility.

• Removeallunplannedtreesorsaplingsthatblockpartsofthefacilityorhindermaintenance.

• Makesurebanks,slopesandareasdesignedforvegetationareplantedwithnativeoreasy-to-maintainspecies.Avoidtreesnearthepondandonberms.

• Plantatappropriatetimesduringtheyearsoveg-etationcangetestablished.

• Replacevegetationdamagedorremovedduringmaintenance .

• Checkaccessroadsandfencing,ifthefacilityhasthem.Theyshouldbefreeofovergrownvegeta-tionandothermaterialssothatthefacilityiseasilyaccessibleformaintenance.

Erosion

• Controlerosionbyreseedingareaswheresoilisexposed,especiallyonslopesaroundafacility.

• Fillinerodedareasandcoverthemwithsod,mulchorothererosion control materials .

Sediment

• RemovingsedimentisbestdoneinJulyandAugustbeforewinterrains set in .

continued on next page

ponds

POnDS

PROBLEM: This detention pond is overgrown with vegetation.

MAinTEnAnCE GUiDELinES

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pondsTrash and debris

• Pickupleavesbeforerainsbegin.

• Inspectandremovedebrisregularly,particularlyafter storms .

• Removeanymaterialcloggingdrains,outfallsandchannels.

• Avoidusingfertilizers,herbicidesorpesticidesinornearthefacility.Chemicalspollutethewaterandcancauseunwantedplantgrowth.

• Identifysourcesofleaksorspillsandcontainthemasquicklyaspossible.

Mosquitoes

• Checkinletsandanyopenorconfinedstand-ingwaterformosquitolarvae(see below) . If mosquitoesareaconcern,contactClarkCountyMosquitoControlDistrictforinformation.The24-hourservicerequestlineis(360)397-8430.

POnD

S

report spillsChemicalspillssuchasoil,gasoline,paintorherbicides/pesticidesmaycauseharmtosur-faceorgroundwater.SpillsMUSTbereportedtotheWashingtonDepartmentofEcologyandtoyourlocalcityorcounty.Donotattempttorinseawaythespilluntilit’sbeenchecked.

WashingtonDepartmentofEcology24-hourSpillResponseNumber:800-258-5990.

PROBLEM: The infiltration basin above still has water more than three days after the rain storm. This indicates a problem that slows infiltration.

Fencing and access lanes

• Checkroadsandfencinginthefacility.Theyshouldbemaintainedtoalloweasyaccess.

Mosquito larvae.

MAinTEnAnCE GUiDELinES

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For signs that maintenance is needed,tipsonhowtofixproblems,andgeneralmaintenanceguidelines,seepage20.

catcH basiN and maNHoleCatchbasinsandmanholesareundergroundcon-cretestructurestypicallyfittedwithaslottedgratebutmayhaveasolidlid.Theycollectstormwaterrunoffandrouteitthroughundergroundpipes,allowingsedimentanddebristosettle.Theyalsocanbeusedasajunctioninapipesystemtoallowaccess .

Catch basin – also called a storm drain or curbinlet,itcanbearoundstructure(older)orarectangularbox(newer).Itisusedwhenconnectedpipesarelessthan18inchesindiameter.Thedepthfromthegratetothebottomofthepipeisusuallylessthan5feet.

manhole–isaround,concretestructuretypi-callyrangingindiameterfrom4feetto8feet.Itisanaccesspointforundergroundpipemaintenance.Manholesgenerallyhavestepsmountedonthesideforeasyaccess.

Catchbasinsandmanholesarebuiltintoalmostallstormwatersystems.

undergroundUnDErGrOUnD

Above: Catch basin (storm drain).

Below: This manhole shows a well maintained interior.

PROBLEM: The photo below shows a catch basin with a lot of sediment.

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drywellAdrywellisanopen-bottomedmanholeusedtoinfiltratestormwaterintothegroundthroughholesinthewalls.Drywellsrelyonthestormwatersoak-ingintothesurroundingsoil.Theytrapsedimentandoilypollutantsinrunoff,andtheycanfillwithoilysedimentinareasthatlacktreatmentfacili-ties.Becausedrywellscanbecloggedandtendtoconcentratepollutantsinoneplace,pollutionandsedimentcontrolpracticesshouldbeusedtoprotectthem.

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For signs that maintenance is needed,tipsonhowtofixproblemsandgeneralmaintenanceguidelines,seepage20.

Additional elements to drywells

FiELD inLETAfieldinletisaconcretestructurethatcollectsstormwaterandroutesitthroughundergroundpipes.Fittedwithaslanted,slottedgrate,itoftentrapssedimentanddebris.Regularmain-tenanceisimportant.Keeptheopeningclear

ofobstructions.Afieldinletisusuallycleanedbyatruckwithavacuumhosebutsometimescanbecleanedwithhandtools.

GOOD: Left photo shows the typical lid of a drywell. Above is a well maintained interior.

PROBLEM: Trash has collected inside the drywell.

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vaultsStormwater filterAstormwaterfilterisapassive,flow-throughfiltra-tionsystem.Itiscomprisedofavaultthathousesrechargeablefiltercartridges.Itworksbypassingstormwaterthroughthefilters,whichtrapsparticu-latesand/orabsorbspollutantssuchasdissolvedmetals and oils .

Thefiltermaterialishousedincartridgesen-closedinconcretevaultsormanholes.Variousfil-termaterialsareavailablefromprivatecompanies.

Vortex sedimentation vaultAvortex-enhancedsedimentationvaultconsistsofacylindricalvesselinwhichincomingwaterspiralslikeawhirlpool,causingtheheavierparticlestosettleout.Itusesavortex-enhancedsettlingmechanism(swirl-concentration)tocapturesolids,floatables,oilandgrease.

Closed detention systemAcloseddetentionsystemisanundergroundstruc-ture,typicallyaconcretevaultorseriesoflargediameterpipes,whichtemporarilystoresstormwa-terandreleasesitslowly.Theytypicallyareusedonsitesthatdonothavespaceforapond.Theseundergrounddetentionsystemsareenclosedspaceswhereharmfulchemicalsandvaporscanaccumulate.Therefore,theinspectionandmaintenanceofthesefacilities can onlybedonebyindividualstrainedandcertifiedtoworkinhazard-ous,confinedspaces.

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For signs that maintenance is needed,tipsonhowtofixproblems,andgeneralmaintenanceguidelines,seethenextpage.

Additional elements to vaults

FLOW COnTrOL STrUCTUrE/FLOW rESTriCTOrUndergroundflowcontrolstructuresandflowrestrictorsdirectorrestrictflowinoroutoffacili-ties.Theyslowlyreleasestormwaterataspecificrate.Itisimportanttomakesuretheydonotbecomepluggedordamagedbecausethefacil-itycouldreleasewatertooquicklyortooslowlyandoverflow.Theyareusuallyfoundinmanholes.

GOOD: Well maintained interior of a stormwater filter vault facility.

GOOD: Lid and entrance to an underground detention facility.

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maiNteNaNce is Needed if you see these signs• Thefacilitydrainsslowlyafterarainstorm.

• Leaves,trashandotherdebrissloworstopout-floworfiltration.

• Thereismorethan¼–½inchofsedimentonthecartridges.

TiPS FOr FixinG PrObLEMS and general maintenanceAccess to facility

• Removeanyvegetationcoveringthelid.

Maintenance

• Inspectionormaintenancethatrequiresenteringtheundergroundfacilitycanonlybedonebyin-dividualstrainedandcertifiedtoworkinhazard-ousconfinedspaces. -Removetrashanddebrisregularly. -Identifysourcesofleaksorspillsandcontainthemasquicklyaspossible. -Removesediment.

Mosquitoes

• Checkinletsandanyopenorconfinedstand-ingwaterformosquitolarvae(see below) . If mosquitoesareaconcern,contactClarkCountyMosquitoControlDistrictforinformation.The24-hourservicerequestlineis(360)397-8430.

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report spillsChemicalspillssuchasoil,gasoline,paintorherbicides/pesticidesmaycauseharmtosur-faceorgroundwater.SpillsMUSTbereportedtotheWashingtonDepartmentofEcologyandtoyourlocalcityorcounty.Donotattempttorinseawaythespilluntilit’sbeenchecked.

WashingtonDepartmentofEcology24-hourSpillResponseNumber:800-258-5990.

PROBLEM: This stormwater filter vault has sedi-ment buildup, indicating that the filter needs to be replaced by professionals.

coNfiNed space warNiNG for uNderGrouNd facilitiesDuetopotentialdangers,onlytrainedand

certifiedpersonsshouldenterconfinedspaces.Thesearedefinedas:

•Largeenoughthatanindividualcouldfullyenterthespaceandwork.

•Havinglimitedorrestrictedentryorexit.

•Notprimarilydesignedforhumanoccupancy.

Formoreinformation,visitwww.lni.wa.gov/wisha/rules/confinedspace/html/296-809-100.htm.

Mosquito larvae.

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tips for maNaGiNG stormwater at HomeHomeownerscanhelpmaintainsharedstormwa-terfacilitiesandprotectthehealthofourstreamsbymanagingthequalityandquantityofrainwaterthatflowsofftheirproperty.

• Keepleaves,clippings,barkdustandsoilonyourproperty.

• Contactyourcityorcountyaboutwhetheryoucanbuildaraingardentokeeprunoffonyoursite .

• Reducefertilizer,herbicidesandpesticideuse.

• PlantnativeorPacificNorthwest-friendlytreesandplants;removeinvasiveplantspecies.

• Sweeppatios,drivewaysandotherpavedareasratherthanhosethemoff.Bagorcompostde-bris,don’tsweepitintothestreet.

managingstormwaterathome

rESOUrCESForinformationaboutraingardens,nativeplants,naturalgardeningandmuchmore,visit www.stormwaterpartners.com/ resources.html.

• Takeyourvehicletoacommercialcarwashthattreatsandrecycleswater.

• Makesurewastewaterfromwashingtheexteriorofyourhomeorroofisnotdischargedintothestreet.Getpermissiontopumpittoasanitarysewerorinfiltrateitdirectlyintothegrassorgravel.

• Disposeofyardandlawntrimmingsproperlysuchascomposting,recyclingoryarddebrispick-up.

• Installpermeablesurfacesforsidewalks,patiosanddriveways.

• Collectroofrunoffinarainbarreltouseforwa-teringplantsandgarden.

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Commercialpropertiescouldhaveuniquestorm-waterfeaturesinadditiontothosetypicallyfoundinresidentialareas.Thesefeaturesincludeper-viouspavement,whichallowsrainonparkinglotsandwalkwaystosoakintothegroundratherthanrunoff;oil/waterseparators,undergroundstructurestypicallylocatedinparkinglotsandatautomotivebusinesses;andsandfilterswhichcanbelocatedaboveorbelowground.

Becausethesefeaturesoftenareoutofsightorblendintotheirsurroundings,maintenancecaneasilybeforgottenoroverlooked.Regularinspec-tionandcleaningareimportanttokeepthesestructuresfunctioningproperlyandavoidpoten-tiallycostlyrepairs.Maintenanceisarequirementof state stormwater rules and local stormwater ordinances .

pervious pavemeNt Perviouspavementallowswatertopassthroughitandsoakintotheground,reducingrunoffandmimickingthenaturalhydrauliccycle.Perviouspavementtypicallyisalayerofspeciallyformu-latedconcrete,asphaltorpaversontopofathicklayerofgravel(8–24inches).Aswaterpassesthroughthepavementandgravel,contaminantsarefilteredout.Thewaterisstoredinthegravellayeruntilitcansoakintotheground.Perviouspavementrequiresregularmaintenancetoallowwatertopassfreely.

maiNteNaNce is Needed if you see these signs:• Standingwaterduringorafterrainfall(seephotobelow)

• Visibledebrisorsedimentonpavementsurface

• Heightofgravelbetweenpaversdepletedbymorethan½-inch(permeablepaversonly)

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PROBLEM: This pervious concrete needs atten-tion; there should be no standing water.

GOOD: Pervious asphalt, note the coarse appearance.

RemembeR:Tofullycomplywithlocallaws,youneedtocheckthemain-tenancemanualforyourarea(seepage27forlocalagencycontacts).Itcon-tainscomprehensivelistsforrecognizingpotentialproblemsandhow to maintain facilities .

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bUSinESSES

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Pervious pavers, note the spaces between the pavers.

oil/water separator Anoil/waterseparatortreatsstormwaterbytrap-pingoilatthesurfaceofthewaterandsedimentatthebottom,allowingtreatedwatertopassthrough.Itismostcommonlyusedasthefirstpre-treatmentfacilityinaseriesofstormwatermanagementfacilitiesandisusuallyfoundinparkinglots,ser-viceandfuelstations.Aunitshouldbeinspectedmonthlyandafteramajorstorm.Makesuretokeeprecordsofyourinspectionsandmaintenanceactivities.

maiNteNaNce is Needed if you see these signs• Dischargewatershowsobvioussignsofoilorothercontaminants

• Thicklayerofoil(morethan1inch)onsurfaceofwaterinvault

• Sedimentaccumulationofmorethan6inchesonthebottomofthevault

• Accumulationoftrashordebris

TiPS FOr FixinG PrObLEMS and general maintenance:• Vacuumorsweeppavementfrequently,prefer-ablyatleasttwiceayear.

• Washpavementusinghighpressurewateratleastonceayear.

• Donotallowdirtorlandscapedareastodrainorerodeontoperviouspavement.

• Repairandpatchperviouspavementwithsimilarperviousmaterialandgravellayer.

• Permeablepaversonly:distributegraveloverpavementandsweepintojointsbetweenpavers.

• Replacebrokenpaversasneededtopreventstructuralinstability.

Problem: Some oil/water separators include coalescing plates (wavy-edged sheets shown above) that separate oil from water, so it can then be skimmed off. Plates should be white when clean.

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TiPS FOr FixinG PrObLEMS and general maintenance:• Inspectionormaintenancethatrequiresenteringtheundergroundfacilitymustbeperformedbyatrainedandcertifiedexpert.Cleaningandproperdisposalofsedimentsandoilscanbedonebymostenvironmentalcontractors.Besuretokeepcopiesofthedisposalrecords.

• Removetrashanddebrisregularly.

• Identifysourcesofleaksorspillsandcontainthemasquicklyaspossible.

• Oilsandsedimentshouldberemovedandprop-erlydisposedof(notinthetrash)

• Secured,floating,oil-absorbentpadscanbeusedtoextendthemaintenanceperiod.

saNd filterAsandfilterfunctionsbyfilteringstormwaterthroughasandbed.Atypicalsandfiltrationsystemconsistsofapretreatmentsystemforremovinglargesedimentanddebrisfromtherunoff,aflowspreader,sandbed,andsystemofunderdrainpip-ing.Thesandfilterbedtypicallyincludesawoven(geotextile)fabricbetweenthesandbedandtheunderdrainsystem.Sandfiltersmaybeabovegroundorinasubsurfacevault.

maiNteNaNce is Needed if you see these signs• Debrisorsedimentaccumulationonsandbed

• Standingwateronsandfilterformorethan24hoursafterarainfallevent

• Trashordebrisaccumulationonflowspreader

TiPS FOr FixinG PrObLEMS and general maintenance:• Inspectionormaintenancethatrequiresenteringtheundergroundfacilitymustbeperformedbyatrainedandcertifiedexpert.

• Inspectsandfilterregularly.Removetrashorde-bristhataccumulatesonsurfaceoffilterorflowspreader.

• Removesedimentfromsurfaceorsandbed.

• Iffilterbecomesclogged,removetopseveralinchesofsandandreplacewithcleansand.

GOOD: A well maintained “API type” oil/water separator.

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best management Practices or bmPs – Multipletreatmentmethods,activities,facilitiesandstructuresthat,usedtogether,helpprotectwaterqualitybypreventingorreducingpollutionofstormwaterandremovingpollutionfromrunoffbeforeitisdischargedtogroundorsurfacewater.

Biofiltration swale–Abroad,open,vegetatedchannelthatfiltersflowingstormwater.Themostcommonformisawide,shallow,inclineddepres-sionplantedwithgrasses.

Catch basin–Anundergroundconcretestruc-ture,typicallyfittedwithaslottedgrate,tocollectstormwaterrunoffandrouteitthroughunder-groundpipes.Itallowssedimentanddebristosettleoutoftherunoffandcanhaveinsertsorotherfittingstotrapoilsandfloatables.Acatchbasinalsocanbeusedasajunctioninapipesys-temandhaveasolidlid.Maintainingacatchbasinoftenrequiresspecialexpertiseandequipment.

Closed detention system–Anundergroundstructure,typicallyaconcretevaultorseriesoflargediameterpipes,thattemporarilystoresstormwaterandreleasesitslowly.Asystemtypi-callyisusedforsitesthatdonothavespaceforanabove-groundsystem.Itisaccessedthroughamanholelid.

Covenants, Conditions, and Restrictions (CC&Rs)–Non-governmentalrulesandrequire-mentsspecifictoacondominiumorhomeownersassociation.Requirementsforresidentsrangefromlawnupkeeptofinancialresponsibilityformaintainingcommonareas,potentiallyincludingstormwatermanagementfacilities.

Curb inlet or storm drain–Acatchbasinthatcollectsandconveysstormwaterrunoff.Usuallyfoundalongacurb,astormdrainhasaslottedcoverandacurbinlethasanopeninginthecurb(seeright).

Detention facility–Apond,vaultorpipewhichtemporarilystoresstormwaterrunoffandslowlyreleasesitthroughaspeciallydesignedoutlet.Detentionfacilitiesaredesignedtodraincomplete-lywithinafewhoursordays.

Detention pond–Anopenbasinbuiltbyexca-vatingbelowgroundorconstructingabove-groundembankments.Ittemporarilystoresstormwaterrunoffandslowlyreleasesitthroughaspeciallydesignedoutlet.

Discharge point–Theplacewhereastormwa-tersystememptiesintoastreamorotherbodyofwater .

glossary

Catch basin (curb inlet).

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Drywell–Anunderground,concretestructurethatallowsstormwatertosoakintothegroundthroughholesinthewallsand/oropenbottom.Maintenanceoftenrequiresspecialexpertiseandequipment.

Filter strip–Astripofgrass,usuallyalongedgesofparkinglotsandroads,thatfiltersstormwaterbyremovingsedimentandoilsbeforethewatersoaksintotheground.

Filter vaults or stormwater filters – Undergroundvaults,manholesorspecializedcatchbasinsthatincludeaseriesoffiltercartridgestocapturesedimentandpollutantsbeforestormwa-terflowsintoapipesystem.Typesofpollutantsremoveddependsonthemediumusedinthefiltercartridge.

Flow control structure/flow restrictor – A structurethatrestrictsorslowlyreleasesstormwa-terataspecificratetoreducefloodingandstreamerosionandfilterspollutants.

HOA – Home Owner Association .

Infiltration basin–Anopenbasinbuiltbyexca-vatingbelowgroundorconstructingabove-groundberms,orembankments.Ittemporarilystoresstormwaterrunoffanddisposesofitbylettingitsoakintotheground.

manhole–Anunderground,concretestructurethatprovidesmaintenanceaccesstopipesthattransportstormwaterrunoff.Itisusuallyfoundinpavedareasandhasasolidlid.

Oil/water separator–Anundergroundvaultthattreatsstormwaterbymechanicallyseparat-ingoilfromwater.Theoilrisestothesurfaceandfloatsonthewaterandsedimentsettlestothebottom.Oil/waterseparatorsaretypicallyusedwherehighoilconcentrationsareanticipatedinthestormwaterrunoff.Forexample,parkinglots,serviceandfuelstations.

Permeable pavement–Speciallyconstructedpavingsurfacesthatallowwatertopassthroughandsoakdirectlyintotheground.

Rain garden–Speciallydesigned,site-specificstormwaterfacilitythatuseplantsandsoilstocapturepollutantsandallowstormwatertosoakintotheearth.

Retention facility–Adrywell,vault,infiltrationbasinorpondthatholdsstormwaterwhileitsoaksintotheground.

Storm drain or curb inlet–Atypeofcatchba-sinthatcollectsandconveysstormwaterrunoff.

Stormwater treatment facility–Alandscapedfeatureorstructurethatcaptures,conveys,slows,detainsand/ortreatsstormwater.Theyincludedetention facilities and retention facilities .

Stormwater runoff–Waterfromrainstorms,irrigationorothersources,thatflowsacrossandoffahardarea,suchastreet,pavedlot,rooforside-walk,thatpreventsitfromsoakingintotheground.

Stormwater system–Asystemofcatchbasins,pipesand/orfacilitiesforconveying,detainingortreatingstormwater.Nottobeconfusedwithasanitarysewer,whichcarrieswastewatertoatreat-mentfacility.

Treatment wetland–Ashallowman-madeponddesignedtotreatstormwaterthroughthebiologicalprocessesassociatedwithaquaticplants.Thesefacilitiesusedensewetlandvegetationandsettlingtofiltersedimentandotherpollutantsoutof stormwater .

Wetpond–Anopenbasin,builtbyexcavatingbelowground,thathasayear-roundpoolofwater.Thevolumeallowssedimenttosettleout.Awet-pondalsodetainswaterusingadditionaltemporarystorageabovethepermanentwaterleveltostoreandslowlyreleaseit.

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contacts and resources

clark couNtyClarkCountyEnvironmentalServices,CleanWaterProgram1300FranklinSt.,Room185Vancouver,WA98660

(360)397-2121

Website:www.clark.wa.gov/water-resources

E-mail:cleanwater@clark.wa.gov

Clark County Stormwater Facility maintenance manualhttp://www.clark.wa.gov/water-resources/ documents/Manuals/StormwaterFacilityMaintenanceManual.pdf

battle GrouNdCityofBattleGroundPublicWorksDepartment,EngineeringDivision109SW1stSt.,Ste122BattleGround,WA98604

(360)342-5070

Website:www.cityofbg.org

E-mail:stormwater@ci.battle-ground.wa.us

CityofBattleGroundPublicWorksStormwaterProgramwww.cityofbg.org/departments/public_eng_stormwater_home.php

City of battle Ground Stormwater - Facility maintenance manualwww.cityofbg.org/docs/stormwater/StormwaterFacilityMaintenance.pdf

camasCityofCamasCommunityDevelopmentDepartment616NE4thAve.Camas,WA98607

(360)817-7231

Website: www .ci .camas .wa .us

E-mail:aashton@ci.camas.wa.us

CityofCamasPublicWorksEngineering-NPDESPhaseIIPermitinformationWebsite and guidebook: www.ci.camas.wa.us/pworks/stormwtr.htm

City of Camas Stormwater Facility maintenance manualWebsite and guidebook:http://www.ci.camas.wa.us/pworks/environ.htm

la ceNterCityofLaCenterPublicWorksDepartment419ECedarAve.,SteA201LaCenter,WA98629

(360)263-7665

Website: www .ci .lacenter .wa .us

Refertocitywebsitefore-mailinformation

La Center uses Clark County’s stormwater manual for reference.

continued on the next page

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ridGefieldCityofRidgefieldPublicWorksDirector301N3rdAve.Ridgefield,WA98642

(360)887-8251

Website:www.ci.ridgefield.wa.us/

E-mail: city.mail@ci.ridgefield.wa.us

Ridgefield uses Clark County’s stormwater manual for reference.

vaNcouver CityofVancouverEngineeringServices4500SEColumbiaWayVancouver,WA98661

(360)487-7130

Website:www.cityofvancouver.us

E-mail:surfacewater@cityofvancouver.us

CityofVancouverStormwatersectionWebsite:www.cityofvancouver.us/waterallaround

Vancouver uses the Western Washington Stormwater manualWebsite: www.ecy.wa.gov/programs/wq/ stormwater/manual.html

wasHouGalCityofWashougalStormwater Section1701CSt.Washougal,WA98671

(360)835-2662ext.205

Website:www.cityofwashougal.us

E-mail:wnoonan@ci.washougal.wa.us

CityofWashougalPublicWorksStormwaterDivisionWebsite: www.cityofwashougal.usthenclickonDepartments,PublicWorks,andStormwater.

Washougal uses Clark County’s stormwater manual for reference.

resources

• Find -linkstoallagencystormwatermanuals -comprehensivemaintenancecheckliststhatalsoshowhowtorecognizeandfixproblemsforallfacilitiesinthisbookandotherlesscommonfacilities -videos -theinformationinthisguidebook -newsandworkshopsscheduleandmore...

at www.stormwaterpartners.com

• WashingtonDepartmentofEcologyStormwaterinformation at www.ecy.wa.gov/programs/wq/stormwater/ index.html

• ClarkCountyVegetationManagement(control-lingnoxiousweeds)atwww.clark.wa.gov/weed/