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. � o � (� � Od � Q <br /> L. ,Jl►L � u 1?7a <br /> �ainage calc's <br /> .. .. ....... .......... <br /> ����CI7Y OF EVERETT���� <br /> P�rmit Services <br /> t, PROJECT OVER VIEW. <br /> This project proposes the construcrion of approximately <br /> 3400 SF Building on 1.49 Ac. lot with associated park�ng <br /> sp�ce. <br /> 2. EXISTING DRAINAGE CONDITION. <br /> Existing surface water sheet flow to the catch basin on north <br /> west corner of the parking lot and from there to City drainage <br /> system. <br /> dn Fvergreen Way approximately 20% of existing surface <br /> flow to existing drainage system on the South West of the <br /> property. � <br /> 3. PF�OPOSED DRAINAGE. 1 <br /> Developed run off is conveyed to wet pond with f!ow <br /> control man holes and released to existing Pigeon Creek No.l <br /> drainage system. <br /> 4. SLOPE OF ENGINEERING ANALYSIS. <br /> 1) The peak developed discharge rate for the 2-year, 24-hours <br /> storm shall not exceed 50% of the peak runoff rate for tt:e <br /> same storni and e�usting site conditions, with a correction <br /> factor applied; and <br /> 2) The peak stomiwater developed discharge rates for the 10- <br /> years and 100-years, 24-hour storms sha�l norexceed the peak <br /> runoff rate for the same storm and existing site conditions, <br /> with a correction factor applied. <br /> , <br />