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Tabie 3.5 <br /> Malntenance of ConVol Structures and Catchbasfns <br /> �felntenanco Sainits Xzpucted WLcu <br /> Coa�ponent Defect CondiHon Wheu Maintenance i•e Necded blainw.mnce u Per[ormed <br /> Contamineti Scc'Detention Pomfe• No pollution preeent <br /> on end <br /> �rt:,, <br /> Pollutiun <br /> -��:�3a f.atch Besin Covcr Nnt in Covcr ie miaeing or only pnrtinlly in plecu.My Catch bnain wvcr is clwacd <br /> Cover Plnce open catch haein requires maintemna�. <br /> LockinR Mec6nninm cannot be oq�ned by one meinterance Mec6nninm openn wilA pmper tools. <br /> Mechaoiem pe+son with pm�rer faoln.Iblln intn framn iiuve <br /> No[WorkinR ���Ao IYl inch o[thzend. <br /> Covcr O�main[enaoa:pertan unmt rcmove lid nller Covcr ran be mmoved by ono <br /> UifficWtW epplYin6normulliRingp�ceaurc. mninlemncepereon. <br /> I{emovc <br /> (Intcnt ie kn:P�'«r[mm ecalinq oRam.ree 10 <br /> maintem�eJ <br /> "��y� I.adder laddcr IndJer iu e�wnfc duc fn mieeing ruo�,oot laddri meete deaign atsudarde and <br /> � Run� ei.�cumly etlncM.�d to baniu waU,mieali�meut, albwe mnintemnce peison eefe <br /> ���p,..;;� Unsnfu runt,trecke,or eharp edgcu. ecccne. <br /> � �� Matal Gntos Cro1e Cmte with upening wufer thnn 7/8 inch. Grate opening mcete dcai� <br /> (!( opening s�o��R. <br /> Appllm6le) Unnnfe <br /> Tmeh nnA Trnsh and debne that in blockinR mom than 20% Gratc Gce of tronh and deUrie. <br /> Uebria of grnlc eudace inlclting cspncity. <br /> Dnu�aEtvl or Gmte mieaing or broken memlwl{e)o(tM1e grnte. Crale ix in plece und mectr,drnign <br /> MiiwinN. uL�nJnnls. <br /> � <br /> - Methods ofAnalysis � section presents thc mctl�ods and eyuaC �s for desig�of cuntrol <br /> '�' ' stru m restrictor devices. Includcd • details for the design oF <br /> qorificcs, ctangular sharp-crosted wei , v-notch wei�s,sutro weirs, <br /> :;;;, :u�d ovcrFl risers. <br /> ��:h;,r; <br /> '::�r . <br /> Orifices. Plow- ugh orific lates in the standani tee sect,on or <br /> turn-down clbow m be a oximated by thc general cquation: <br />'''�;�� Q =C A 2gh (cqualion 4) <br /> ,�_ � <br /> when: Q= ow(cfs) <br /> Y'��� cocflicient uf clisch e(O.G2 for pinte orifice) <br /> �X"`�� A=area of orifice(ftZ) <br /> h=hydcaulic hcad(ft) <br /> g= gmvity(32.2 NsccZ) <br />�; tgure 3.20 illustratcs this simplificd apptication o c oriticc <br /> :�, .'� e9uation. <br /> 4.,� <br />��s�ti <br />.> .. : <br /> b� �- . <br />; ' . ._.___._ . _.. _ . ._ . . __ -__. __._. . ___ . . __—. ________-____. <br />� `=sbruary 2005 Volume ll!-Hydrologic Analysis and Fbw Control BMPs 3-57 <br />'v <br /> r <br /> x <br /> .. . 4 � ^z—_.. <br /> ` KN � ��.� 4� �srfFai��e ..� � 4 i <br /> r Se+ F Y, kr� f�r ���° i"i . . a <br /> ��y��y�+` ''"` . t�v k'Y` F , JT��`� �r° :. � ': , <br /> . "eM'�P��k, +�e� • �1mX ... \'n`� *�� t. � . <br /> �" k . . _ r.rn. , S*°._ s�"2rs.` . ., ._..am�..7x5�.w�'. <br />