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i <br /> � I�MP C233: Silt Fence <br /> � !'urpn.�c Usc u� a �il[ lcncc rcdu�c. thc tran�purt vf cu;orsr scdimcm Imm a <br /> constiuctiun sitc hy pro��iding a tcmporary ph}'sical bareicr io scdirncnt <br /> � :md reducing thc ivnoff vclocitics of o�crland tlo�t. Scc I�i�,urc a. 19 ti�r <br /> dctails on silt fcnce consuvction. <br /> Conditions o(Use Silt fencc may be uscd dou nslope of all disturbcd arcas. <br /> 1 • Silt fence is not intended to trcat crnicenuated flow�s, nor is it inicndcd <br /> to trcat substantial amounts of ovcrland Ilo���. Any conccntratcd ilows <br /> must be com�cycd th�nugh the drainage syslem to a scdiment pond. <br /> � Thc only circumstancc in which ovcrland Ilow can bc u'catcd solch• b�• <br /> a silt fcncc, rather than by a scdimcnt pond, is�chcn thc arca draining <br /> to the fence is one acre or Iess and (lo�e rates m•e Iess than 0.5 cfs. <br /> � . Silt fences should not be constructcd in su•eams or used in V-shaped <br /> ditchcs. �'hey are not an adcquate method of silt control for anything <br /> � dccper than shect or ovcrland (low. <br /> Jcmts m f 9er fabnc shall be spliced at <br /> ,osts.Use slaples,�mre nnps or z•r2'by 74 Ga wire or <br /> eq��n•ai�nl lo atiach 1;1Unc to posls equrvalenl.d slantlar0 <br /> � -�- ---�'��- SliengihldbucUSetl - <br /> � '_ —....__ _ . �_—_"_ _ _. .� <br /> ' _ _ <br /> = I_: �� Fitlertabric � � �,K, <br /> _ ° <br /> [ <br /> - - I� N <br /> � f <br /> . . µ �I C <br /> ' _ �..�_: . . 6.�max �' " —�— ���� M�nimum4"x4'trench � � � . . E <br /> / N <br /> � Backliil irench with nalive seli � �f <br /> Posi spacm�may bc mucasetl ur 3l4'�1.5"washetl giavel <br /> In 0'il wnc backing�s used <br /> � 2"c2"wo0tl posts,stecl Icnce <br /> po5i5 0�cqwvalenl <br /> � Figure 4.19—Silt Fence <br /> � De.ri�,�n und • I)rainagc area of I acrc ��r Icss or in combination with sedimcnt hasin <br /> Insfrrllutiun in a largcr sitc. <br /> Specifiraria�s <br /> � • Ma�imum slopc steepness(normai (perpendicular)to Iencc line) I:1. <br /> • �1a�imum shcct or ovcrl.md Ilow path Icngth to the Icncc of I 00 fcct. <br /> � . No (lows grcatcr than 0.5 cfs. <br /> • 'I hc gcote�tilc used shall mect the tollo�ving standards. All geotestiic <br /> propertics listcd bclo���arc mininunn a��cra�e roll valucs (i.c., thc tcst <br /> � result for any snmplcd rull in a lot shall mcct or cxcccd thc valucs <br /> sho�4n in Table 4.10): <br /> r4-gq Volwne Il—Construclion Sfonmvater Polfulion Prevenfion Febru�ry 2005 <br /> )G <br /> � <br />