HomeMy WebLinkAboutZ-6782-A Map 1KEYSTONE BLOCK WALL TEMPORARY CONSTRUCTION FENCE
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SECOND BAPTIST CHURCH
DETENTION CALCULATIONS
UNDEVELOPED CONDITION
L = 150 AE= 6.2 S=6.2%
Cu =0.44 (Table 2.2)
T2= 9 min (Figure 2.2) 6 = 7.5 m1hr
DEVELOPED CONDITION
L=200' AE=9 S=4.5%
Cd = .90 (Table 2.2 - Pavement/Roofs)
I, = 5 min (Gutter) i25 = 8.5 in/hr
Area = 150'X 65' = 0.22 Acres �
DESIGN DISCHARGE
�iala'I 1 V� 4 Q25 = Cu (i25)A
= 0.44(7.5)(.22)
0.73 cfs
11 O Fl k DIFFERENTIAL RUNOFF RATE
r
R=Cdi25-Cui25 v
1r 0 101.34 02 102.34 104 106 litn 108 } = 0.90(8.5) — 0.44(7.5) \ % i
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4.35 ~ w
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108
' t?rF r i` TOTAL VOLUME OF DETENTION
6 d t V V= RA t 60
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99.00 `` �-' G � 00. �� r „`.1 � ��"' 106 = a.3s(o.22)(5)(6D>
#. K r-0 = 287.10 ft3
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98.0 9.0 , Op ° a ,
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o 6a RESULTS
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_:CIJR UT ,,.,,' ), ONL'< ,z .,.y MATO.£ - Volume of detention needed = 290 ft {#
8" PVC DRAIN P E-
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rw t ��ats� _,,.�..�����iQ ���' - Use an 8" diameter pipe for the design discharge (undeveloped) rate.
1, -0"x1, -0„x1,-0.. H BASi1 WITH
i r. - _ _ _ - This size pipe will allow 0.73 CFS to flow through it with an inlet head of-
t
GRATE AT BO TT M DETENON fl — i 9 . r : # _. .
t 0 2 This pipe is the smallest allowed
POND f 8 # �` rot ” y ` " YiW NJ LD I N V 7 The volume of storage needed is small because a very little of the site is
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! being changed from natural cover (undeveloped) to pavement/roofs ,
(developed)
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1 DEMEjLISH & �TfEPLE, 98'
- DRiVE-THRU, TRASF4;7REES, f`✓ it t .« ,_.,
ASPHALT; ALK$JTC- AS
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SEE FENCE DEAILTHIS SHEET
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SITE GRADING/DEMOLITION PLAN
1" = 20'-0" 7 �#
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SHEET NUMBER:
REVISED: 6 JULY 2001
DATE: 15 MAY 2001
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