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� � ���� <br /> I-S MOTEL D <br /> CITY OF EVERETT � <br /> MAR 1; 1989 <br /> ._............................................................... <br /> PETENTION CALCULATION CITY 0� EVERETT <br /> Public Works Dept. <br /> . Pleese re£er to City of Everett st�ort-£orm qtorm drain <br /> � inatructions. <br /> . Table 1: Lrainage 9asin is "Comtined Sewer - Ou �.side <br /> Uoantown" <br /> , �K Design Starm, Pre and Poat-Development <br /> is 10 Year . <br /> ; Table 3: Peak Rate ai Runo{f, 2^: Slope 0. 31 c{s/Ac-C <br /> Ok <br /> for landscaped area O.OS Acres � <br /> � Table 5: Peak Rate of RvnofF, 2�: Slope 1 .32 cfslAc-C <br /> t - <br /> , ior impervioue aree 0.31 Acrea <br /> Tabla 6: 10-yr Design Detention Storege Required <CFiAC> <br /> . Lendscaped Area : 54 x O.O� = 27 CF �.7 <br /> i <br /> Impervious Area: 1604 x 0.31 = 507 CF `�9� Z '+' <br /> � 5�99. 9 <br /> � <br /> Totel Storage Req'd = 534 C.E <br /> I Srez+�''�"�°'`fo0 � <br /> i � F• R�R �..,�-�`�` <br /> J�10oF riasp�G���'r �!/�Q-p' <br /> �/(�/H„`��' � ti . o <br /> M �e '�I� z <br /> N ^ <br /> -� �r �„����� <br /> �� Burton F. Reanier, P£, LS o , 5- <br /> , <br /> �f�o�PFr�c:T_�z�pb�a� - . <br /> `' !j�-#s�I'1'� <br /> ���Fnginecc°�.o' <br /> . <br /> 3-i7• a9 <br />