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� s <br /> Reid, Middieton � Ass�ciates, Inc. � <br /> En ineers • Surveyors • Planners x <br /> FILE N0. 02-85-094 9 ; <br /> Octaber 10, 1985 � <br /> gev�se8 Oct. 25� 1965 � <br /> S`1l�RM WATER DETEN'PI�i �� �R � <br /> SILVER I,ARE SII,F SF.EtVICE S`PORAGE ANID GAI&7ASf1 <br /> BY POGET i�IFST ODRPORl�4'IOfI <br /> CITY OF EVF�2E1Tr WASAII�iCN <br /> FXTSTTNG S7TE �IDITIQ�7S <br /> Acea = 3.197 Acres <br /> Residential lot with gcass field and Nooded areas west of residence <br /> Existinq nrnoff coefficier�t = (SEE ATeA� CALC• � � � <br /> Tc = 450/1,,60) + 10 min. = 17.5 min. <br /> Intensity = i = 1.38 in/hr @ 10 yr. Storm F.Verett Cucve <br /> � Q existir�g = c i A = 0.22 ( 1.38 ) 3.197 = 0.97 c.f.s. <br /> � r��rna� aCI�IDiT� <br /> Area = 3.197 Acses <br /> Prorated runoff coefficient = SEE ATTA�ID CALC• Sf1EET = �•$Z <br /> Desic�► Storm = 25 year <br /> Required Detention = Qo = 0.97/ 0.82(3.2) = 0.35 <br /> T = -25 = 2706/0.35 = 62.93 <br /> Ve = (4329(62.93))/(62.93 +25)-(40(0.35}G2.93 <br /> = 3098.19 - 581.02 = 2217.17 <br /> V total = 2217.17 (0.62) 3.2 = 5,817.85 cu.ft. <br /> Due to the lack of a defined storm drainage channE� to the south of this <br /> project and after a meeting with Dan Mathias, City of Everett. This project <br /> will discharge it's storm water into the existing draina9e way at the northwest <br /> corner of the project and contribute to the te9ional stoLm water detention <br /> syatem fund for said basin. �he oontribution will be based on a cu.ft, charge <br /> of $'2.37 for the required detention vol�me for this project; � <br /> = 5817.85 X 2.37 = $13,788.30 . <br /> 121 Sch Avenue North, Suice 200, Edmonds, 'J/oshington 98020 (2061 775-a434 <br />