stormwater management bmp type - jmu...stormwater as it flows through the storm sewer system. there...
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Stormwater Management BMP Map
Stormwater Management BMP Type
1 Bio-retentionFilter(RainGarden)2 DetentionPond/DryPond3 Detention(Underground)4 GreenRoof5 HydrodynamicSeparator6 LandUseChange/ConservationLandscaping7 Oil/WaterSeparator8 PermeablePavement9 RainwaterHarvesting10 RetentionPond/WetPond11 SandFilter12 Stormfilter13 StreamRestoration14 TreeinaBox(Filterra)15 Wetlands
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Port Republic Road
Interstate 81
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Reservoir Street
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MLK Way
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TherearemanydifferenttypesofstormwaterBestManagementPractices(BMP’s).Somearedesignedtodealwithwaterquantityandstorestormwaterrun-offandreleaseataslowerratetoreducedownstreamfloodinganderosion,whileothersaredesignedmoreforwaterqualityandfilterpotentialpollutantsthatdrainthroughthepractice.Andthentherearesomethatdoboth!FollowingisaquicksummaryofstormwaterBMP’sthatcanbefoundonJMU’scampus.
1.Bio-retentionfilters,morecommonlyknownasraingardens,areconstructedtreatmentareasthatslowlyreleasecollectedstormwaterrun-offandfiltersgatheredpollutantsnaturallythroughplants,mulchandsoilmedia.Thereareabout33bio-retentionfiltersofvarioussizeslocatedonJMU’scampus.
2.Detention,ordrypondsareconstructedtoprovidegeneralfloodprotection,collectingstormwaterrun-offandreleasingitdownstreamataslowerratehelpingreducepossiblefloodingdownstream.Thereare11detentionpondslocatedonJMU’scampus.
3.Detentionpondscanalsobeconstructedundergroundinvaultsandworkthesameasaboveground,andgenerallygounnoticed.Mostareacollectionofconcretevaults,andthereare3undergrounddetentionsystemslocatedonJMU’scampus.
4.Green,orlivingroof,isaconstructedroofwithvegetationandsoilmediaplantedoverawaterproofmembrane.Inadditiontoreducingtheamountofrun-offleavingaproperty,thispracticealsohasadditionalbenefitssuchasthermalreductionandenergyconservation.TherearetwoinstallationsonJMU’scampus,oneofwhichisademonstrationareaatMadisonUnion.
5.Hydrodynamicseparatorsaremanufacturedstructuresthatseparatessedimentandotherpollutantsastheyflowthroughthestructure.Collectedsedimentanddebriswillthenneedtoberemovedduringmaintenancecleanings.Thereare12hydrodynamicseparatorsonJMU’scampus.
6.Landusechanges,orconservationlandscaping,istheprocessoftakinghardscapesurfacesortypical“lawns”andchangingthetypeofplantsintheareatoallowmeadowsand/oradditionaltreedensity.JMU’sHillsideProjecthastaken3.6acresofturfandmadethischange.Alsothroughoutcampus,vegetationhasbeenallowedtogrowadjacenttostreamstoprovideariparianbuffer.
7.Oil/Waterseparatorsareanundergroundtanksysteminstalledtocollectpetroleumproductsinthecaseofalargeaccidentalspill,thuspreventingtheproductfromgettingintoourlocalstreams.JMUhasoneoil/waterseparatorlocatedattheirfuelingfacility.
8.Permeablepavementallowsforhardscapessuchassidewalks,parkinglotsandroadwaysbutalsoallowsforinfiltrationofprecipitation.ThereisoneinstallationofpaversonJMU’scampuslocatedatparkinglotAnearWilsonHall.
9.Rainwaterharvestingisaprocessofcapturingstormwaterrun-offandreusingiton-site.JMUhasoneinstallationofthispracticeoncampuslocatedatWaylandHall.
10.Retention,orwetpondsworkverysimilarlytodrypondsexcepttheywillhaveapermanentpoolofwater.ThereisoneinstallationofthispracticeonJMU’scampuslocatednearISAT.
11.Sandfiltersareanothertypeofinfiltrationpracticethatworksverysimilarlytobio-retentionfiltersexceptthemediaismainlycomprisedofsandandthepracticesarenotlandscapedwiththeplantsthatarepartofbio-retentionfilters.ThereisoneinstallationofthispracticeonJMU’scampuslocatedbelowtheURECturffield.
12.Stormfiltersareanothermanufacturedfilteringdevicethatareinstalledundergroundandfiltersstormwaterasitflowsthroughthestormsewersystem.Thereare12stormfiltersinstalledonJMU’scampus.
13.Streamrestorationistheprocessofre-engineeringthestreamtoincludenaturaldesignconceptstohelpensurebankstabilizationandre-connectthestreamtothefloodplain.JMUhasrestoredapproximately3,700linearfeetofstreamthroughthecampus.
14.TreeinaBoxisanothermanufacturedpracticethatbasicallyputsaone-plantraingardeninastormdraininlet.Thiswilltreatthefirstrun-offfromastormeventwhichwilltypicallyhavethemajorityoffreshpollutantsinthedrainagearea.Thereare13treeinaboxunitsonJMU’scampus.
15.Wetlands,orinthiscaseconstructedwetlands,areanaturalbiofilterinstalledtotreatpollutantsfromstormwaterrunoff.Several“pocket”wetlandswereinstalledalongwiththestreamrestorationworkinthearboretumwhichalsoallowsforadditionalconnectiontothefloodplainandwaterstorageduringfloodingevents.
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