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,/ 5-10-89 �11;24AM �EVERETT WA PBLC WRKSi 2063623819�� 3 <br /> �Y;GROUP ��Y INC, � � /r <br /> _ '` ( <br /> = I L �.,L1�Ks r�� <br /> Pu� <br /> L <br /> e� ,3 ,14 .3 Wet Ponds in the Si7.ver I,ake Watershed shall be <br /> desiqned to provide a 24 hour residence time for a 2 <br /> ( year rainfa�.7. event (1.55 i.nches of pXeaiP�.tation) . <br /> Wet ponds outside �he Silver La):e Watershed shall. be <br /> designed to provide a 1z hour residence tiime for a 2 <br /> year rainfall event (1•24 inches of precipitatton) . <br /> 4.3 .14 .4 Wet ponds Design �r er e t of the required wet pond <br /> a) At least 50 P e�anent (dead)_ storage• <br /> volume shall be p <br /> � b� At least 3o percent of the lanted ew tha watland <br /> pernianent pond shall be p <br /> vegetation (sucri as cattal�s or bulX'ush) • <br /> �� TRe maximum deptih oi dead storaga na planted <br /> �,nche� for the portion o£ tha wet P inches <br /> with wetland veqetation with 6 <br /> praferred• <br /> a� ��e side slopes shall b� n nreferred) �han <br /> horizontal to 1 vertiaal (5:1 <br /> e� A lp� wi.de flat s e�anentnwater sur£ace shall <br /> inchas below the P �rimeter of the pond. <br /> be provided around the p <br /> g� �he length peraent width ratio sha7.1 be at <br /> least 3:1. stream of the <br /> g� Grit reraoval shall be provided up <br /> We� pond by a 72 xnch dlameter catch baein W�th <br /> a 48 inch deep sump- • Al�ernativ2ly a Forebay <br /> with a o5 251 incheseSotenpeeC pitation) � maX Qbe <br /> storm ( <br /> provided. rovided aaross <br /> hj At leaet one bafPo a•shall be P <br /> the width of �.he ed solely for Water quality <br /> • �� We�, ponds dasign <br /> �.mprovement shall be designed of oncehevery��W° <br /> d�$�qn volume at a frequencY <br /> years. For wet ponds incorpor.ated Tncofi��,able <br /> datention ponds, a mul�i orifice ( p <br /> method) sha7.� be provided to ensure tha� the <br /> wet pond d t�5 y deptrh �s aqualled or axoaeded <br /> once avery ears. ond shall. <br /> j� The open wa�er portion of the We� psix feet. <br /> � hava a dead ..storag� dQpth oP tht'ee to <br /> Add: <br /> i <br /> � 4. 3..15 GRASS LINED SWALE�les w�.l� bg xe�ired £�r aved <br /> 4 .3 .7.5•7- Grass Lined � are feet or more of P <br /> d�vel.apment with 10, 00o squ <br /> � area. Grass lined swalgs Wi��- be rea�ired for a <br />