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r <br />I. <br />Z deten6on volume for design stocm plus addidonal 50% <br />' 10. DESIGN CALC[JLATIONS - Attached in Appendix A are the drainage calculations <br />I l l. PROPOSF� DRAINAGE SYSTEM - The proposed drainage system is coroposed of <br />the collecdon system , waler quality pond and underground detention stotage for 10 and <br />• 100 year sWrms with discharge direcUy to the Everett Way Mall Way d�ain line . The <br />collection system involves standard catch basins and slotted drnins to two vaults which <br />I compose the wet cell of the wet pond. The wetpond volume exceeds the City standard <br />requirement . The wet pond oudet is restricted to Ecology's 1/2 the two undeveloped <br />� release rate. Drainage volumes above U►e water quality storm will be diverPed to the <br />piped sw�age system. This system meets the Ecology design standard for the 10 and 100 <br />year release iate and 150% oP the detention volume. F1ows from the wetpond aad <br />' detention system aze joined together befo�e discharge to the City system. <br />� <br />'Ll <br />August 1, 199fii <br />