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fA\ 20677 <br />LOVFLL SAItFRI..ANU <br />EVERETT DRAINAGE CALCULATIONS (less tha <br />Clearing Plan, LSA 2769 <br />Existing runoff rate = 0.150 cfs/acne <br />Post —development design storm: 25 year recurrence <br />Type of cover: <br />(future) <br />lawn/landscaping <br />earth/gravel <br />impervious <br />area, detention <br />acres: /acre: <br />--------------------- <br />3.956 x / 812 = <br />x l 2830 <br />x 3762 = <br />required <br />detention: <br />3210 cf <br />cf <br />cf <br />Z 002 <br />3.956 acres <br />3210 cf <br />ca <br />v r71,, i <br />�77 j r 6u cr `j �)n _� urr,,•� <br />DETENTION STORAGE REQDIRED <br />Table 6 <br />and <br />Table 7 FI`_r'/ <br />----- <br />10 year design storm <br />_=-------____=_ <br />125 year design storm <br />%ke,Ict ice, L)ec"l J <br />Peak rate i <br />lam/ <br />earth/ <br />;lam/ earth/ <br />cfs/acre I <br />landsca_mgravel <br />impervious <br />ilandscagravel <br />i*pervious <br />------ -I <br />------ - +--------------------------------------------------------------- <br />rr Prr �.; n-t- r K'C <br />0.005 <br />HA <br />+ <br />1104 <br />HA <br />4544 <br />HA <br />6837 <br />1802 5843 <br />8181 <br />r �; I �� (C'tC� • 11 : ' `. <br />i <br />NA <br />HA NA <br />HA <br />0.010 <br />1060 <br />4323 <br />6576 <br />± 1744 5631 <br />7926 <br />HA <br />NA <br />NA <br />NA <br />NA NA <br />NA <br />0.030 <br />NA <br />910 <br />3598 <br />5506 <br />1591 4794 <br />6842 <br />0.050 <br />NA <br />742 <br />NA <br />3149 <br />NA <br />5189 <br />NA NA <br />i 1370 9229 <br />NA <br />5886 <br />J <br />+ <br />ALP <br />NA <br />0.070 <br />NA <br />i <br />NA <br />615 <br />NA <br />2808 <br />HA <br />4256 <br />' NA NA <br />i 1227 3811 <br />NA <br />5248 <br />r <br />j/z7l 9 �i <br />i <br />NA <br />HA <br />NA <br />AA NA <br />HA <br />0.100 <br />0.150 <br />+ <br />488 <br />2439 <br />3520 <br />y 1033 3386 <br />4505 <br />298 <br />1994 <br />2873 <br />' 812 2830 <br />3762 <br />0.200 <br />i <br />108 <br />1548 <br />2225 <br />590 2274 <br />3019 <br />NA ` <br />NA <br />HA <br />NA <br />+ NA NA <br />NA <br />0.400 <br />+ <br />0 <br />447 <br />1151 <br />0 1010 <br />1693 <br />NA <br />HA <br />NA <br />NA <br />+ NA NA <br />NA <br />0.100 <br />f <br />0 <br />0 <br />97 <br />D HA <br />607 <br />NA <br />1.000 j <br />NA <br />0 <br />NA <br />0 <br />HA <br />0 <br />I/�x"d" - <br />clel�nficn ucl�rne -acre <br />val,.e <br />6 efw e,n ( CRv n ar1C-a"o <br />cinol Pc7 I(n�tr7�•2l <br />bes4- <br />,1-runciccocl,h'cn5 <br />iv, <br />&m 9 Z <br />