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�oo F�:Cau_ley ___ _
<br /> WJA� P.S. BMFEiNO. t — �F-- � —
<br /> AreMteets, Engineers, Plannors c.�cu��reoar DFF p�TE 3-21-88
<br /> CHECNEO BY RO DATE 3-23-88
<br /> 9CAlE
<br /> The lot is in 'ttie, North Creek Drainage aasin.
<br /> From 7able 1 : � Use a�.5 yeal^ Design Storm for Pre-Development. :
<br /> ' ' Use a�5', year Desigm Starm for Post-Development. _._ _.._. __.I. .
<br /> Pre-Development Conditions: i
<br /> � ' Total Area of the Lat = (223)(166) = 37,018 SF = 0.85Ac. _� �_
<br /> � ! Impervious Area - 0.04 Ac.' (House, etc.) . � -1_ :
<br /> ' ; Pervious. Area = 0.81 Ac'. (Lawns), � ._I
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<br /> Ground Slope = 9% Average., I � I .�-�—
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<br /> i ._.. , From Table 3 -. Pervious, Runoff = 0.30 CFS/Ac� . , I
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<br /> From Table 5 - Impervious Runoff = 1.24 CFS/Ac� � ,
<br /> � __�. . �. .
<br /> i.._J_ _, : : ,
<br /> i ; Total; Allowable Release = (0.30)(0.81 ) + (1 .24)(0.04 ) = 0.29 CFS , .�_
<br /> , $t_: This is equal to 0.344 CFS/Ac C -J .
<br /> � pp �._ : ' I - ,.. � I
<br /> � , _ t . � i _ .
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<br /> ' Development Conditions: .
<br /> � , Impervious Area: � �
<br /> 4[(84)(25) + 2(23)(20) + 4(7)(10) + 4(4)(3)7. --- — `II
<br /> . i � Buiidings _..I— -- �- I
<br /> ' ' _ �—I
<br /> -_-I , ; 4(210D +. 920 +, 280 + 48) _. 13.392 SF � — ..-- -_.;
<br /> i � �
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<br /> ._.. . - - - -;..
<br /> Asphalt Parkiny, Driveways, and Trash Enclosure. _ _._.__ _j_
<br /> � ._.. _ r
<br /> `-- -----._ ' ; (26)(204) +, 6(9I(20). + 8(22)(15) + (10)(11) ° -- —�_
<br /> i [5304 + 1080 +. 2640 + 1,107 = 9134 SF � �
<br /> �. _ 1_ .
<br /> , , , Total Impervious Area =. 22,526 SF = 0.52 Ac � f ;._ �
<br /> Total Pervious Area = 0.85 - 0.52 = 0.33 Ac. c , ', ;
<br /> ; . From Table 7 - Storage ReQuired = 2064 CF/Ac (Impervious) c _ ;
<br /> � = 165 CF/Ac (Pervious) L
<br /> '_ _._ -
<br /> _... __ j , . , , I2064)(0.52) +, 165 (0.33) = 1127.73 = 1128 CF G
<br /> ' ! � � ' Th[s would require 160 LF of 36° pipe for detention. ,
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