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Campreherisive Plan Silarmwailer Mlamigemienil � uit-Dlemeril <br />Gcineiiial'IN, effeetime stormwatcm managemcinl einta:il s lhle usei of silruatural and nonrslructural faoiEticis <br />to ensura Mat thlci mo.lumci, rata, tiim ing, and pol: uilant loadiin€I of 1post-devulopmenl silarmwarter runoff <br />ara simi: ani to thlal whlichl occurred priori to demcilopment. Ovenii the ct jectiuei is to utilize a <br />comb.inalion of both) tcahrliques to effciat:imaly promide adaquata pallution rill and flood <br />protection :in the mosl aeanomical mannar possibla witHim Indian Rivar County. <br />DEFINITION'S <br />Tha followiing sciation contains def nilions for the silarmwater managamient termis referenead ir.i ilhis <br />Sub -•Ell emcnl : <br />East Managamiant Practiices (BMPs): These iii to practices usad to achieme satilsfactory water <br />quality ata minimum asst. Struolujal HMPs amphasize prasaniation and/or simulation of natural <br />drainage featuras to pnomota i[nfiiltnalion, filtration, and raduaed peak d1sohanges. Examples include: <br />ratenticn/c citentiion pands, infiltration trar.ichles/basins and giiassad swialas. Exampllas cfl r.ian• <br />struolural BMPs inalude: watenshad managament, fac:ilitias miaintananae, land usa planning anc <br />public aducat:ion. <br />Dasi n Hilann: M.la twarity-fine-ycian raturn fiiequenoy, twlentyl-fourhlour c uration, Soil C ansarvat:ian <br />�larviice '➢ypa II modifrcid rainfal l d:istn:it uilior.i. 'Wa miinimum totall amount of pneoipitalioni foil lhlis <br />twanity-four-hour c uration storm shall I be 8.64 inichles. <br />Elraina eg_Basini: phis :is the ancia, def incic by topognaphia boundar:icis, whicih coni as stormwiatar <br />rur. cffIto a reaaiming body. <br />Eatentilan Strucilura: `➢his is a structure whiah collacts and ilamporarilly Aoras starmivaailan fon tEci <br />purpase aft twailment lhrlaughl physical, chlemiicall, an biological pnocasses with subsciquanil gradual <br />rel aasa cfl ilha stannwatar. Thle bencifiits afl on-site storage of stormwziten includci: reducing thlci <br />meaaaity cflsil irmwailar runoff; setllling and filtering pcllutanils, and rachlarg:ing aquifers. <br />F irsl Fllushl: M.Iis descn:ibas the washing aat:iory thal silarmwater runoff blas on accumulaled pol:lutarlts. <br />Studies ir.ic i aata plat the first inch of stormwiatar runoff transpari s as mivahl as 90 parcent of the nori- <br />point sourca pollutiicn miginailing from a storm. <br />Floodplain: This is an araa wilthl a hlighl probability of being inundatac dun:ing a 100-yaar flood avcr.it. <br />Flood 21cncis: Areas designated as " specia:l flood hazard areas" ara dalineailad by BHMA's National <br />Flood Ir.isuranca Hiioglram (NBIH) as "A" zones or "'NA" zonas on Blood Insurance Plana Maps (FIRMs). <br />Designiatad flood zones as c cifinied by FEIMA are Listad below: <br />Community Develapmerill DeAlarlmerill Inc liar River Cour illy <br />