Laserfiche WebLink
BMP C233: Silt Fence <br />Purposc Usc of a silt fcncc reduces thc transport of coarsc sedimcnt from a <br />construction sitc by providing a tcmporary physical barricr to sedimcnt <br />and reducing thc nmoff ��elocities of overland flow. Sce Fi�ire 4.19 for <br />details on silt fence construction. <br />CondiHons of Use <br />Di�si�,�n uiid <br />/nstu!lurinn <br />Spccificarinna <br />Silt fcncc may bc uscd downslopc of all disturbcd arcas. <br />. Silt (encc is not intended to Ircat concentrated Flo��s, nor is it intended <br />to treat suhstanlial amounts of overland Oow. Any conccntnted flo�vs <br />musi be convcyed through ihe drainagc system to a sedimeni pond. <br />I hc only circumstancr in ��hich uvcrland (10�1 can bc trca�cd solcly b�� <br />a�ilt fcnce, rathcr than by a sediment pond, is when the area drainine <br />to the fence is one acre or less and flow rates are Iess than 0.5 cfs. <br />. tiili fcnces should not be conswcted in svcams or used in V-shaped <br />ditches. They are not an adequate method of sih control for any-ihing <br />decper than sheel or ovcrland flow. <br />Jomis in Liter la�nc 6nall0o cpLxC at <br />posls. Uso staptes, w�rc nrps or <br />e�uivalonl to 9':a:h laGr.c 1� posis <br />::::.i:iui ..ir.� <br />� � r',• W� .�� <br />�" <br />I I :n: ^ :i <br />:3,t . :: 't: .... <br />� � 1:�::f:: Y. �:: <br />}��i. .�:L <br />I I �•1: ��} ��1�.:':: <br />�• � 1 ..���.�.. <br />� � ;'.F�:i�r- <br />742' C Id Ga. wiro or <br />cauNal�em, il slanEarO __.. <br />sGongth labnc used <br />FFcr IaEnc -- <br />E <br />N <br />....,....nry....�......�..... _"'_ _ lJ <br />7�.--6' mai --- � ��� Minimum a'rl' Irench '� , - E <br />'� ' �' , - � <br />� Back/10 ironch Wth native soil J- - <br />Posl epatlnp may bo incrcaxed \ or 37'4.5' washed g�avel <br />Io 8' il wiro Eackinp is used % <br />2Y2' wood Iwsis, stocl lenw <br />posU,or equivalenl <br />Figuro 4.19 — Slit Fence <br />• Drainagc arca o( I acrc or Icss or in combination with scdimcnt hasin <br />in a largcr sitc. <br />• M11a�imum slopc stccpncss (nomial (per��cndicular) to fcncc linc) I:1. <br />. Maximum shcct or o�•crland (lo�v paih Icngth to ihc fcncc of 100 fcct. <br />• No (lows greatcr Ihan 0.5 cfs. <br />• Thc gcotcxtilc uscd shail mcet thc following si:lllAlfAS. AII �CO�I'%11IC <br />properlics listcd bclo��� arc minimwn :rvcr�gc roll valucs (i.c., thc tcst <br />msult for any sampled roll in a lo� shnll mcct or c�cccd �hc valucs <br />shoN�n in Tablc 4.10): <br />4-94 Volume !1— Consfrucfion Sformwafer Pollution Prevenfion February 2005 <br />