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CITY OF EVERETT DRAINAGE CALCULATIONS (less than 5 acres) 05--Jun-92 <br />— 03:34 PM <br />Wa— Sang —Clearing —Plan, —LET=.-2769________________________________________ <br />Existing runoff rate = <br />150 <br />0.25 <br />cfs/acre <br />year recurrence <br />Y <br />Post —development design <br />storm: <br />detention <br />required <br />Type of cover: <br />area, <br />acre: <br />/acr <br />detention: <br />(future) <br />acres: --------- <br />---------- <br />—-------- <br />lawn/landscaping <br />1.978 <br />X <br />812 = <br />2830 = <br />1605 cf <br />5597 cf <br />earth/gravel <br />1.97E <br />x <br />3762 = <br />cf <br />impervious <br />x <br />------- <br />--------- <br />7202 cf <br />3.956 <br />acres <br />DETENTION STONAGE REQUIRED Table 6 <br />and <br />Table 7 <br />10 year design storm <br />+faun25 year design store <br />Peak rn6e <br />i <br />1n71/ each/ <br />lndsco. gravel irpery <br />4 / earth/ <br />Dery <br />cfs/acre - --- -i-----:-gravel ------ <br />------ 5843 <br />818 <br />0.005 <br />iiO4 4544 <br />6837 <br />' 1802 <br />NF. ];A <br />l;A <br />%. <br />NA NA <br />1060 4323 <br />l;A <br />6576 <br />+ 1744 5631 <br />7926 <br />0.010 <br />IR <br />1;A 1;A <br />111A <br />NA l;A <br />1541 4794 <br />NA <br />6842 <br />0.030 + <br />910 3598 <br />5508 <br />NA NA <br />NA <br />1;A <br />0.050 + <br />NA 1;A <br />742 3149 <br />];A <br />5189 <br />i 1370 4229 <br />5886 <br />1fA <br />i <br />1;A NA <br />NA <br />NA 11z <br />1227 3811 <br />11A <br />5248 <br />0.070 <br />615 2808 <br />4256 <br />+ 1; NA <br />NA <br />l;A i <br />O.i00 <br />M. 11A <br />488 2439 <br />NA <br />3520 <br />y i033 3386 <br />4505 <br />0.150 <br />298 1994 <br />2873 <br />` 812 2830 <br />590 2274 <br />3762 <br />3018 <br />0.200 + <br />108 1548 <br />2225 <br />+ NA 1;k <br />NA <br />NA y <br />1;A 1;F. <br />0 447 <br />Ilk <br />1151 <br />i 0 1010 <br />1693 <br />0.400 + <br />i;k NA <br />NA <br />1;A <br />NA <br />0.700 <br />0 0 <br />97 <br />0 NI <br />± <br />1;A 1;A <br />NA <br />` Nr NA <br />NA <br />l;A <br />70 <br />1.000 ti <br />0 0 <br />0 <br />1 p <br />