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. -� _.� <br /> � <br /> - May 18, 1994 �p <br /> Triad Job No. 94-045 p� <br /> Mr. Gordon Witcher TRIAD A SS OCIATES <br /> Everett Public�Vorks <br /> 3200 Cedar Street <br /> Pro�ecl Managemeni <br /> Everett, WA 98201 Civd E�ginecnng <br /> La�tl Survcymg � <br /> Re7 IIIIPAWCSI—SCAWAy LanC U5e Plamm�g <br /> Required Stormwater Detention Volumes Lantlscnpc Ar��iicc�urc <br /> S�te DCsign <br /> Dear Gordon; <br /> Thank you, Jane and Dan for the quick response in determining the required stormwater detention <br /> volumes for the Intrawcst-Seaway project. Based upon the package I submitted on Monday, the <br /> following parameters were e�'ablished: <br /> Rooftoo Detention Dnta <br /> Required Volume—39,204 Cu.Ft. <br /> Allowable Release Rate— 0.I S CFS <br /> We will attempt to provide this volume within the proposed open pond areas of the wedands <br /> enhancement. My agreement with Bill Railton was that the live storage could not exceed one foot <br /> in depth. The reduced area of open ponds may require me to route some of the rooftop flows to <br /> the other detention faciliry; that will be resolved (hopefully) tomorrow. <br /> Parkine and Landscaned U�t� <br /> Required Volume — 77,]01 Cu.Ft. <br /> Allowable Release Rate— 0.36 CPS <br /> Jaue and Dan have noted concem regarding "diversiod' of additional area to the Narbeck Creek <br /> basin. I'll attempt to "redirecP' an equal area into the Merrill Creek basin, as the design proceeds. <br /> This bookkeeping will be presented within the formal calculations (whenever I get to them). <br /> Thanks again for your assistance. I'm striving to provide an easy review for you and your team. <br /> Sincerely, <br /> TRIAD ASSOCIA ES <br /> � <br /> Roy . Lewis, Jr., P.E. <br /> Senior Engineer <br /> cc: George Constantine <br /> Bill Railton <br /> ��.:•� .. ,��,�, .�.�, .. �...��i.nr.! ^.r.-�� . �.. �.: rhonc ' � .. � ..:'.- Toll Prcc . ;.:,, ' - Fa� ,., .. <br />