HomeMy WebLinkAboutSDP198400006 Plan - Approved 1984-08-20AF 11634A
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Z c-->I� 21A,
Construction Proposed in Eastern Water Shed Only
Area= 1.57 Acres
Existing Peak Plow DeY2102ed Peak Flow
40% Impervious Surface 90% Impervious Surface
C= 0.55 C= 0,9
t(:= 5min t := 5111in
i 2= 5.5in/hr i 10 =7.lin/hr i 2= 5.5in/hr :i. W=7 .1in/hr
Q2= 4,68cfs 9, LO =6 ' l3cfs Q2 =7.66cfs Q 10= 10..03cfs
Detention VOILIme required with Post -development
10 year peak inflow and Pre -development 2 year
peak outflow.
V=Q i_Q0 (2.678t c /2)60sec/min,
=(10.03-4.68)(2.67(5)/2)(60)=2143 Cubic Feet
Volume provided with wall to Elevation 460=3200
Cubic Feet
Outflow is controlled to 4,44 CPS with 13"
diameter orifice on inlet end of existing
15"CIM.P. This may be accomplished by inserting a
12" flared end section into the inlet end of the
15' pipe and filling the void with Bitumastic or
flexible caulking.
Engineering Design and Calculations by:
W. S. Roudabush Inc.
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EXII�-v'17. HAI'-J01r_-APPeV 5r-�4C'E:S
NFEW �5pAcEs 45
NEW au� SPAC-8-ib !?)
rO'I'A L_ -- 100
F -A I:Z k.'- I N G S PA r- r-- S r:;—'E0 U I;Z E5 0
/.4 SFS r �) (,27o) -, A) m '7 0 P_ e!" 10.
10& Pr?.OVILDco
SETF3Ac�:K RPEOUIRSAAGNT5;
SID-= YAF?_CC
f-51JILPINC-a Ar.',J'=AS -.
E EX 14- -r
NEW eQtje__.Arr1r__)N eLP(3,.
PLlc)rvg 4x'700 S.F:
NEW 5ELLOVVS��Hlr-' HAUI�-- 4*,:::)0 15,F-
TO-I'AL
MI., E 11A M I L -T ON, ASSIO'C".
ARCH ITE -C7.1
A. L A. -
C I IA It LOT. I'LSVILIA") VIRGINI A
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C,
HU P?r H
IZIO ReVA0 CHAFZt.<>,r-rr=SVILLE_=
REVISE ISSUED
IZ:241, D"'� 06 MAR30 1984
Z 0 1 N I G: 0
S I TE, F"Li/a 1\1
D F. A W N
CHECKED
C) (-' H
DATE
SCALD
I SHEET NO,