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1' <br /> -���.: <br /> i I <br /> A. EXISTINC SITE CONDITIONS: <br /> i . nRea �i3.7 x z3o = z6i5i sr (o.Go nc) <br /> 2. SLOPGS 20$ TO 1004 <br /> 3. COVEfl TREES AND BRUSH. GROUND IS COVERED BY LEAVES AND CRASS. <br /> 4. RUNOFF FLOWS TO ALLEY THEN ONTO PROPERTY TO THE F.AST. (SEE <br /> FIGUflE 1, p. 4) <br /> 5. RATE OC RUNOFF <br /> USE C c 0.10 AND 10 YA. STORM <br /> Tc = 114 :- (1x60) + 10 ^� 12 MIN. <br /> i = 1.7 <br /> Qexist. = 0.60 x 0.10 x 1.7 = 0.10 efs <br /> B. POST DEVELOPMENT: <br /> 1. THE HllILDING, WALKS, STAIRS AND SOME LANDSCAPINC WILL COVER THE <br /> SITE. <br /> 2. A COh�INED SF.WER WILL BE CONSTRUCTGD ON 35?H STREF.T FROM THE <br /> EXISTING MANNOLE (with 21" OUTLGT MAIN1 AT WETMOftE, NEST TO THE <br /> ALf.EY, TIiENCE SOUTH TO A CATCH BASSN AT THE LOW POINT IN THE <br /> ALLEY. (SEE FIGURE 1) <br /> 3• ON-SIT6 DETENTION IS NOT flEOUIRF.D (SEE ATTACHED C7TY OF EVERETT <br /> MFx70, p. 51 <br /> 4. RATE OF RUNOFF FROM SZTE <br /> c = 0.90 70 Yfl STORM <br /> Tc = 230 i (5 x 60) + t0�v 10,� MIN. <br /> i = 1 .8 <br /> Qnew = 0.60 x 0.90 x 1.8 = 0.97 efs <br /> C. SIZF, tdEW SEWEA LINE: (SEE FZGORE 1) <br /> 1 . LINE IN ALLEY �� <br /> AREA A 114 X 230 = 26?20 SF (0.60 AC1 Cc0.90 0.511 <br /> AREA B ASSUME FUTURE APARTMENT TYPE <br /> DEVLEOPPIENT 114 X 125 = 14250 SF (0.33 AC1 C= 0.85 0.28 <br /> AREA C t6 X 375 - 6000 SF f0. t4 AC1 C=0.90 0.1� <br /> AC - 0.95 <br /> OVERLAND FLOW 390' , AVG. SLOPE 15� VEL. 8 fps <br /> Tc = 390 (8x60) + 10 = 10.8 MIN. <br /> i - 1 .8 <br /> Q4 = 0.95 x 1.8 = 1 .71 efs <br /> USE 10" PIPE S c .007 CAPACITY ? Cfs <br /> , � <br /> �'��� <br /> ;�„ <br /> ��•: <br /> ,. <br /> . �;�. <br /> , �;:, : <br /> ,y <br /> � � � � � � �;�,:���r j� ��, <br /> . ,' . <br /> .. ' . �� . . . •Y.� , <br /> „� +r.wW��etaN/ry1MYW,y�p�qy� � <br /> L 4 � <br />