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Malntenance. Convol stmctures and catch basins have a history of <br /> mnintenancc-relatcd problems and it is imperative Uiat a good <br />"���.-^,-'.� maintenance program be establishecl for their proper functioning. A <br /> typical problem is lhat sediment builds up inside the stcucture whicl� <br /> blocks or restricis tlow to the inlcL To prevent this problem these <br /> � sUuctures should be routinely cleaned out at least twice per year. Regulaz <br /> inspections of control structures should be conducted to detect the necd for <br /> non-routinc cica�ioul,cspccially if construction or I:.nd-distucbing <br /> activitics are occurring in thc contributing drainagc arca. <br /> A 15-foot wide aceess road to Ihc control slructure should be instal(ed for <br /> ir,spcction and maintcnlnce. <br /> ,�'" f.ible 3.5 provides rrWintenance recommeudations for control sWcture; <br /> fi:``� ;ind catch basins. <br /> ----� - .__.. -. . . . .. . _... <br /> Table 3.5 <br /> Maintenance of Control SWctures and Catchbasins <br /> Maintonanco Resultn E�cet�wl Whun <br /> Compooent IwCeirt (:ondilion W6en Maiotenauce ie Necded Mnintemnce is Yerfonnud <br /> Genernl 'Itneh snd A1aLLrinl exnxJn 2i%uf xump dupth ur 1 fad b�kro�n[�`ct�,1u�n��ebrint <br /> I�:Lrix l�clawnrificeplaG:. <br /> (Includen remuved. <br /> M�dimenl) <br /> SWctural Stn�etum in not o�snrtly elWchid to monhule StruRun�secnrely nttnchnllu wall <br /> Da�m�: wiJl. nndoude[pipe. <br /> t*'._ Struclum in not in upriF���I����on(ullow up W Structum in mrmct poeiUon. <br /> �,���}'; F IOX Gum Plumbl. <br /> r _ i <br /> ; Canneclin`w W oulla[pipe nte nnt wnlerli�ht and Conn�ctinnn to uuUct pipe nrt:waler <br /> xlww xi�,mx nf rust. tight;eWcturc mUaimd or[cPina�d <br /> ; nnd worlw nx dcaigned. <br />� . p Any holen.other lhmi Jexigned 6nlea in the � titructurt;hnn o0 6olex Mhcr LLan ` <br /> � dcxi ed holex. <br /> structu'c. � <br /> i <br /> � ; Clennout Dnmugi�d or C�ennoul qntc in mt waG�rUgh[or w mimmg. Cate w walurtiFht anJ w�nrke aa i;,t':: <br /> IGnte MieainR denigned. �.a _. <br /> � Cnlc cnnnut!x�muvnl up m�d dnwn bY����� OsUe muvca up and down cnailY and ia � i <br /> x wnG:r�i,hl. ' <br /> ;�y�� � mainWnancc�n`a�m. P <br /> � Chni�Jmd Ic:idinK W gatc in mvssing ur Jamng�yl. Chnin in in ylacc and workx as <br /> .•:•.39rh �. <br /> � J�.wi�,�neJ. <br />� �, I Gate ix rw+V-v1 over 50%o(ita surfnce nren. (�ate in mpainvl or mpinced ta mr.wt <br />� j dmi�,m n�indnnlx. <br />� � <br />�,a�, <br />�,,r, � Orifico Platr. Uxmu�d nr ����rol dev�m�s nut wurking properly duc W PInW ix in plaa;and workn as <br /> � Minxing muwing,out of ph�ce,ur Imnl orif ce plole. dexigncvl. <br /> r'� <br /> ,� ; Obxtn�ctiune My tmnh,Jr6rix,neAiment,nr acF��tiun F'Inte ix fn�of all obeLructionx nnd <br /> � bh�ckin�,Lhi.pL�tc. wurkr ae dceiµmd <br />> � i .y <br /> ��� ��+. <br />� �, I Ovrrflnw 06=trucuunN A�ry Innh ur dc6rin Lla:km�;(nr Imving Ns Pipc in fnrte ofnll ubstructionx and � .. <br /> �'� � iypr PuG•nti'il d1lx�kintdlLrov�[Ouwpilx. tiurkaaKd�eq;rrd <br /> � Y <br /> � 1 Yqy. <br />� �,� ,i . ".�:�- <br /> s— � ��� <br /> ^7 �."r... ;� ::t-'U:� 's4��hur��� 111--i I}'ilr��lniiir. Anrdpsis :�nJ f`!rnv �,c ihu� Li!.f!':; -'�5 <br /> y <br /> P;.:.>:�;. <br />�t:o�'j,':I <br />�n�_p� <br /> __ � <br /> v" �,�_ k" i -... ., <br /> � J.k��� .V {�� :+M �� , <br /> y �_. `�^ Y� j� 9 M^� • <br /> :._ r.. <br />��}r� , t c1� s .�` 1 '9� v�i � � f. . <br />��,,. 9= _ ��; , . , . <br />