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,vc:un s��,tem or :i dram;i_e ,�aem ��ith limiied cap;�eit� and thc amnunt�,I detention rcquired excecds th� Cit}'c <br /> ihrcshold �ulumc ul�?0 cuhic licl. <br /> fhc slrcamhank crosion cuntru� st�mdarJ is to limit pcak flo�cs liom thc dctclopcd sitc during the _'-)'car. 2-1-huur <br /> ,iomt to >0 perccni ul th� cxis�inu condition _'-�ear. '_�1-hrnir p�nk starm runoff and lu maintain the c�is�in� <br /> cnnditiun peak �lo�v rates li�r ihr�I li-cear and I I)0-cru. _'4-hour desier su�rms. ��ith appropriate correetion <br /> I:iciors Iscc ti�ction I-� ti�r flinhcr dciailsl. <br /> R\1Ps providine li�e ;tnraer fur strr.mi 6ank ero,ion convol must ha�c an outlet control siructure �hat meets <br /> ,trcamh�mk erosiun control ;t,mJards. f)esiga criteria tor outlet conirol stnicwres are cieen in Seciion I-�.ti. <br /> 3-35 SI'I:CII�IC ST,1ND,1R1)ti ANp SP�CIFICATInNS FUR PUNDS <br /> 3-3.5.1 I3D1P RD.Oj WETP0IU <br /> f)c::icn l'ritcria <br /> I. r\11 ��elponds sh;tll Ir.n'c a t c�etated lreatntent ccll preceJerl b�' an open ��aler cell and nr hv :� «ele:uilvtanl.. <br /> 7'he comhined pertnanent ponl �olumr of the pon:l (including the open «ater cell andior the �cehaidUt�mk 1 <br /> shall he equal to thc columc of runuff frum the G month. '-t-hour stonn. <br /> '_. A miniminn o( I�°6 of the permancnt pool �ohime mwt be associated with thc ccectated trcatment ccll. <br /> �cith a maximum nvera�e permancnt p�ul depdi uf n�o fec� and depths ranging Gom zeru ro �.� (eei. <br /> A masimum nf R>4,h of ihe perni:mer� pool volumc rna� he associated u ith the open ��ater ccll and'nr <br /> ��rt�aulUtank. �eith a pennanent pool dcpth uf thrcc io�si.� fect. A minimum pennanent pool �olume must <br /> hc pruvided in eiiher ai� oprn �rater cell or a ��en�aulUtan6 and is cakul��ted usine the design criteria for <br /> �+elvaultsR;inks Isee Secliou ±-3.6.1). <br /> -1. A 72 inch catch hasin �vi�h four fcet of catch,or an equi��alent �aul[,shall be prm ided immediatek upstream <br /> u(the open �eater cell for those wetponds desiened �vithout an upstrcam wetvauWtank. <br /> ?. :lcccss is requircd to thc honom of the npen �rater ce?I for wetponds dcsigned without an upstrcam <br /> ��en�au IVtank. <br /> t� Runoff shall pass through the upen water ccll or wetcaulvtank before enterine dic veectatcd treatment cell. <br /> ? An eartf:en berni or conerete haftle sh�ll he used to scparate open �later cells and �egctated Veatment cells. <br /> This baffle shall c�tend to thc pcm�anent pool ��aicr elc�ation. <br /> S Fach ceil of�he pnnd shall ha�e an ellectice leneth-:o-width ratio of at Ieast 3:1. This leneth-to-�vidth ratiu <br /> mav he crcaiecl �cith intcrior, impemicaMc haf(les �shich extend to an clevation 0.5 feet ahove the «atcr <br /> elecation of the permancn� pool. <br /> '�. Il a «ctpnnd ��ill hc �nnsiructcd in rclati�el} permcablc soils, or if infiltration into the eround could <br /> iJvcrsch �ffect thc stohilit} of ncarh� slopcs,a liner ��ill he rcyuircd for the permanent pool area. If a liner <br /> i; rcyuircd, thc spccificatiuns pro�•idcd in Scction 3-1.7 shall bc mct. <br /> I D. ;\ Plantine !'lan fi�r the vcLetated trcaunant cell shall he develaped for approval hy the Cin•. Required <br /> uensiq oi'plantines is a minimum of one plant per square foot in die Sil�er Lake drainage basir. ar.d one <br /> plant per '_.'_� squarc feet uutside of thc Sil�er Lake drainaee basin. f'lants of the samc tppc sL�ll be planted <br /> in proup;, rather ISan in a completcl} ranci�m patterr. Natite plants suited to the Jepth of wa�er in differcnt <br /> portions of the �e�etatrd treaimem ecil shall be srleeteJ such as hardstem hulrush or cattails in [he deepest <br /> part of the cecetated trraunent cell (12-30 inches of�vater depthl. yello�c iris in slighth less deep areas of <br /> the «etland vcaunent cell (1'-2a inchcs)and so�t rush, small-Guited bulrush, and/or othcr sedees and <br /> rushe. in ihc sh:ill�+��'and perimei��r arc�s of Ihe pond I(I-1 Z inchesl. Uecp and �hallo�� areas of the pond <br /> +hall hc pl.m�ed wiih t��o or murr dilfcr;nt tipccica of plam,. <br /> i-;_] �rc� -J'Olu <br /> � <br />