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(n PROJECT CONSULTANTS CONTENT'S _ PEVISION Job no.P�"'1"Pool
{ _ -�C"'� drawn niC�J
I NORTMMD SQUARE HARVEY DADD & ASSOCIATES - STRUCTURAL --
if ITI Al1BURN, MASHIN6TOtf GERALL+ EDLUND ASSOCIATES - LA!NWAPE c h e c k -f,- -; .�
24 FAMILY APARTMENTS date
MA � f=�
--- m HUD-W tWA19-0041-010
&
C INC. RS. ARCHITECTS CONSULTANTS 1 1814BELLEVUE AVE.,SEAT TLE,WN.96122 TEL.. 206 329 r2426
fdlMINd OfQARTIAWT
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.wn�icn �� L-A
STOP4I WATER RETEN'r_ON CALCULATIONS
Time of Concentration (TO = 100+806+100+10 min.
C Existing = .15
C Future M .80
r = "1.5
A = 1.33 acres
Q existing (I15) (1.5) (I.33)
L
.30 cfs
since area is<50 acres & flow<20 cfs.
10 year storm design:
Qo = Allowable Outflow
Acreage x 'store Runoff Coef.
= 30
� 3�0
.28 cfs/.Acre C - -
..A vw- orifice outlet conditions exist.
T = -25 + 4770TQo
•-25 + 4 7S77_-W
54.33 min.
Vn = 2820 T - 40 Qo T -
T+25-
2820(54.33) - 40(.28)(54.33)
54. +
1322.8 ft3
V total = Vs x Acreage x Rur-eff co -efficient
= 1322.8 (1.33)(•80)
= 1407.5 ft3 +
parking lot surface with
the volute of runoff to be detained in the
:r, "vc_.age depth of .5 inches and�a width of 641. Required min. length = � y
J I
Actual design capacity '�,- , cud
i.he cJrifice formula to size the outlet:
f = .62 (sharp edge orifice) I -
h Vertical distance between the headwater surface and
center iine of the orifice. >
Q allowed hi -
.62
.62
-- .034 �t.2 I -- --
• � 1� T
.268 ft = 2.50 inches
A
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DEPT.OF PUBLIC WORKS
CITY OF AUBURN
ENGINEERING DEPARTj!�ENT
APPfgwo
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BEST FIELD INFORMATION
F
-
AVAILABLE
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73
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STORM wanvu RETENTION CALCULATIONS
c.
Time of Concentration (Tc) - 100+80+100 +10 min.
c Existing = .15
C Future = .80
I - 1,5
A - 1.33 acres
Q existing = CIA
(.15) (1.5) (1-33)�
.30 cfs CIP.
rj.4-r 12
u�,-,J,,g 10 year storm design since, area is,50 acres & flow<20 cfs.
le outflow
Qo Al ow
Pcreage x Future Runoff COef-
.30
TMIF -.9,0—
4r;( PLAW
.28 cfs/Acre C
vm^ orifice outlet conditions exist.
40
T -25 + NrrT6T7Q—o
-25 + Y17TT7-.'IT f
54.33 min.
Va = 2820 T - 40 Qo T
T+25
2820(54.33) - 40(.28)(54.33)
54. +
ft3
1322.8
V total - Vs x Acreage x Rur-off co -efficient
. 1322.8 (1.33)(.80)
- 1407.5 ft3
be detained in the parking lot surface with
AvWA11T- Njoug
mc, the vollnle of runoff to Required min. length
depth of .5 inches and a width of 64'.
mg*ivay
rA Lv,:.--age
4'. Actual design capacity - JW cu. ft-
FR*04,c, r
IF
I- she orifice formula to size the outlet:
.62 (sharp edge orifice)
-,4
ffill�
Q .6 2 a
between the headwater surface and
SUMQ
Milli --,(d7 AW==, 6CA4. HE7- W
h Vertical distance
center line of the orifice.
Pv -/I/_
L p_aLilowed
4N!
WT
=WH.
.62
,�Hllal
A
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3
.62 vT-DT-.2TTj--,2T
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PLUCA W/
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r UNIT TfALL
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BEST.I•NFORMATION
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APPROvalu
DF-Pit- OF PUBLIC WORKS %
CITY OF AUBURN
GERIG DEPARTMENT
7w
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70
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DATE*
mpliov
SITE PLAr"A ALL, yqt9rzv- MA F44,L-�l PH
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STo m WATER RETENTION CALCULATIQNS ! I :? �. A - � � „? �; • Y : -� e : N
Ti= , of Concentratign (TC) " 100+80+100+10
�4 l
v �� L.
' C Existing =
C Future
= 1.33 acres
A t ' 1
a existing = CIA
z (.15) (1.5) (1.33)• J
_. .30 cfs T
- 20 cfs 5% CAP.---- --
e_i.ug 10 year storm design: singe area is,(50 acres & flow<
Qo = Allowable Outflo C�JFIi�L`Etl�R '
' Acreage x tore Runoff Coef.� g -^ O
.30 - --- t. J N
.3 .05 . l �: /9�f M k
- .28 cfs/Acre C _
A .:.vw orifice outlet conditions exist-
- -•25 + t ti L L (�
54.33 min. _ c 'D V 13 i-
Vs -2820T -40QoT _
- T+., 5
i - 2820 (54.33) - 40 (.28) (54.33) = Y W_
54.33 + 23 W
I
i
- 1322.8 ft _ _
V total = Vs x Acreage x Rur-off co -efficient
= 1322.8 (1.33) (.80) _ ' _
°
= 1407.5 ft3 -
. W�
1
�: �s;c► the vuluwe of runoff to be detained in the parking lot .surface with _
5 inches and a width of 64' . Required min. length = ' ] M
n - - age degth of -- - v-
�.v.:=
--
- . f�
4'. Actual design capacity = V3Q cu. -- a .
� .P •. - W
{ -- -- _..
.Q
y- � J
c- � 5 !/5E;
�.heorifice formula to size R I
the outl }
7��F_
►- F
_ �G.62 sha eda orifice) --- -; 111Il--
3'=f ' [D
Q _ .62 a 2gh • _ —� tlyC
' between the headwater surface and -
h - VA ' cal distance P ' .. _ _ _. - - -- - .. _ - '
�� �•SIH _1N 1$
i
•i
t
center line of the orifice. 1 ` b • — - 7RVVY� I
i
allowed . ' •'•,+7� -
' b
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>v.
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ODs 1 i _ 141 THIS DRAWING HAS BE ,
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•' 28� 73` O O s .: , , <. O ` l 7/° 71.71 ^J 7/_ �.UL
BEST FIELD INFORMATI N
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