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1、SeattlesNaturalDrainageSystemsAlow-impactdevelopmentapproachtostormwatermanagementIntroductionAnentirelydifferentkindofstreetForyears,plannersatSeattlesdrainageatedpollutantsdirectlytothesurround-utilityfacedadilemma.Nearlyathirdofingwaters.ItwouldalsorequireahugeIntheswales,
2、healthythecityhasnostormdrains.Inthosear-investment-moneySeattlehasntfoundeas,stormwaterflowsalongstreetedges,in50years.totheendoftheblockwhereitgathersplantsandsoilsbreakTheanswer,itturnsout,wastocreateinstreet-sideditches,plungesthroughanentirelydifferentkindofneighbor-culve
3、rtsand,ladenwithroadwaypollut-hoodstreet,astreetwhereplanteddownpollutantsantsandpesticidesandfertilizersfromswalesalongthepavementdothelawns,poursintosmalllakesoranum-workofguttersanddrains,capturingberofnaturalcreeksleadingtoPugetstormwaterandlettingitsoakintothethroughnatu
4、ralSoundorLakeWashington.Residentsofground.Intheswales,healthyplantstheseneighborhoodshavelongclam-andsoilsbreakdownpollutantsthroughoredforthekindsofamenitiesthatexistprocesseswhilenaturalprocesseswhilereducingrunoff,intherestofthecity-sidewalks,curbs,exceptduringtheverylarg
5、eststorms,toguttersand,ofcourse,stormdrains.almostnothing.ThiswasthefirstSEA-reducingrunofftoAnd,asenvironmentalawarenesshasStreet,incorporatingavarietyoflow-grown,communityactivistsandcreek-impactdevelopmenttechniquestostoresideresidentshavepressuredthecitytoalmostnothing.and
6、infiltratestormwater,andtocapturecontrolfloodingwhichregularlyscoursandbeginthebiologicalbreakdownofcreekbedsdestroyingsalmonspawningwater-bornepollutants.Together,theareasandcreek-sidevegetation.Atypi-techniquestestedatSEA-StreetNo.1calpipedstormdrainagesystemcouldhavebecometh
7、emajorpartofSeattlesolvelocalfloodingproblems,ofcourse,PublicUtilitiesNaturalDrainagebutitwouldstilldeliverhighSystems(NDS)strategy.stormwatervolumesandtheassoci-2NaturalDrainageSystemsThefirstSEAStreetjustaftercompletionin2001Today,inseveralneighborhoodsthroughoutSeattle-withm
8、oretocomeasfundingbecomesavailable-SEA-Streetsandtheirvariationshave
