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STOIL�[�VAT��2 SITG PLAN <br />AUGUS7':1 \VOODS CONDOMINIUbIS <br />MAY 20, 2003 <br />PAGE 27 <br />13AS W 4 <br />Thc storn� drainage system used in Basin 4 consists of collection and conveyance <br />of runoYf to a pr�-trcatment sedimentation vault. The releasc from this vault and <br />liigher flows are discharged to the wedand, thcreby helping to maintain the <br />hydrology of d�e wetland. Storm water dctention and treatmcnt are provided in the <br />Basin 2 detcntion vault by detaining a portion of the triUutary offsite area, see <br />above. <br />BMP RD.IS WET VAUL7;�TANK <br />The sedimentation vault h�s bcen sized for the 6 monUi storm event per the requirements <br />�f Ihe CEY[ Manual using tlic following equations: <br />Qo = 6 month volume/36,�00 <br />= 614/86,400 = 0.0116 <br />V,,,;,, = 1676.5 Qo H use FI = 3.43' <br />= 1676.5(0.0071)(3.42) <br />= 41 cf <br />A Cuz concrete CCP 577 UI, or cqual, providcs approximat�iy I 13 cf of dead storage and <br />is proposed for use on this project. <br />� <br />J'.lAcrosonCra�g�Augvs:a wec]; Sae Poan 03�O�POoeumenls�S5Po3-011 DOC�VVH/SfRI <br />