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CITY OF EVERETT DRAINAGE CALCULATIONS (less than 5 acres) 09-Jan-92 <br /> DICK JOHNSON 19TH AVENUE PROPERTY, L3A No. 2697 11:23 Ali <br /> --eaexaaem�a==v����cv=��ea��ce'=c�-ao—evea�=aaa��e=s'�r_=e==c=�ee�e�'ace <br /> Existinq runoff xate = 0.498 cfs/acre <br /> Post-development desiqn storm: 25 year recurrence <br /> Type of cover: area, detention required <br /> (future) acres: �acre: detention: <br /> ----------------------------------------------------- ----------------- <br /> lawn/landscaping 0.233 x 0 0 cf <br /> earth/gravel x NA = cf <br /> imperv10u8 0.334 X 1339 = 448 Cf <br /> 0.568 acres 448 cf <br /> p6T8lTIOY S9'0141G6 RBp1IRBD TaDle 6 aad PaDle 1 <br /> eaaeesee�tcssaaze'"eeeex'aeszee"sea'ee¢ezeazeveesa'ezs"vzeceeev:ase"s'"�''eev' <br /> + lo year desiga ston +25 yeaz desiqn eton <br /> Peah rate 4 lam/ eartG/ ylam/ eart6/ <br /> cfs/acre i lmdscapqravel i�pernious ilandscaqravel i�pervious <br /> ------------ -+-•--------------•------------------- -+------------------------- <br /> 0.005 + 1104 4514 6a�1 + 1E02 5d43 Albl <br /> NA NA AA NA NA NA NA <br /> O.Ola � 1060 4323 6576 y 1144 5631 7926 <br /> 1A � NA MA YA + 8A NA NA <br /> 0.030 � 910 35% 5506 � 1541 4194 6b42 <br /> IA + NA 1A HA � NA IfA NA <br /> 0.050 4 142 7149 5189 � 1370 4229 5b66 <br /> NA + NA NA NA � 8A 6A 1A <br /> 0.070 4 615 2608 9256 y 1221 ]!11 5218 <br /> NA � NA NA KA + 96 9A NA <br /> 0.100 � 4A6 2439 35Z0 4 1033 3386 1505 � <br /> 9A + 9A NA AA + N�l i�l MA <br /> 0.200 � 106 154! 2225 4 590 2214 3016 <br /> IA f 9A NA NA + NA NA NA <br /> 0.�00 4 0 447 1151 � 0 1010 1693 <br /> 0.49A + 0 301 607 � 0 HA 1339 <br /> 0.700 � 0 0 97 4 0 MA 607 <br /> NA � AA NA 9A + AA NA NA <br /> 1.00D j 0 0 0 j 0 !a 70 <br /> 6i IIC � S C L C � C <br />