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FEB-14-96 15:21 PROM:TREPANIER ENGINEERING iD: 206 259 S55B . r q/7 <br /> CITY OF EVERETT ^UBLYC h'OftKS <br /> DRAINAGE CALCULATION SUBMISSION FORM <br /> Date �31[96 <br /> Pznject Nam�: �V`�N FFI)II2AL sAVIIVGs B'irILD1NG _ <br /> Project Location: 79th Avenue SE & 104th S� <br /> SubilU.tted By: Trepanier Fhgineerinq <br /> Orainage Basin: Silver iake Cceek _ <br /> Pre-Development Design Slorm (yr) : i0 -•_-- <br /> Post-Oevelopment Des.ign Storm (yr): 25 __ <br /> Area of Site (ac): o_SC, <br /> Existing Slope af Site (%): 5$ <br /> Existing Grounct Cover <br /> K'oods/Forest (ac): 0.0'7 • <br /> Lawns/Landscaping (ac : 0.40 <br /> Earth/Gravel (ac): 0.02 <br /> Impervious (ac): 0.07 <br /> Fxzst9.ng Rw�-0ff (cfs): (0.07)(0.21 ) +' (0.40�0.4'I ) + (0_02)(0.86) + <br /> (0.07)(7.40) = 0,29 �._ <br /> Proposed Gramd Covex <br /> � Lawns/Landscaping (ac): p_z2 <br /> E3rth/Gravel (ac): <br /> Zmpervious (ac): o_3a . <br /> ' Detenti.on:S*oi�age Requi.red (cf/ac) <br /> Lawns/Landscaping (cf/ac): N/A _ <br /> Earth/C,ravel (cf/ac): � <br /> Impervious (cf/ac) : 1,259 _ <br /> Total Oetention 5torage Required <br /> . Lawns/Land�caping (cf): t�/A <br /> Earth/Gxavel (cf): <br /> Tmpervious (cf): 8 <br /> Total Storage Requ�ed l'c.�� 42 <br /> d�/ .See ap�j�a��ceo� <br /> "� 2�5-9� <br />