HomeMy WebLinkAboutSTORMWATER CALCULATIONS - 07-00461 & 462 - Airport Self StorageAirport Self Storage
Stormwater ati Calcu s
I on
Presented to
City of Rexburg
Seven DiamondsEnterprises LLC
ALI]rport Sl,,wlf Storag.e
Project # 07221
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September 2007
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4YSchiess & Aciasso tes
CONSULTIN G ENGINEERS
Airport Self Storage
Seven Diamonds Enterprises LLC
Schi'ess & .associates
Proj"ect Na. 07221
Volume Calculation - Stormwater
Area 2
Lo
150 ft
n
0.15
So ,:
0.4%
C
95%
A
G -43i, 1 ac
Furthest water must travel to catch basin
Manning's number for asphalt
Slope of asphalt
Factor for asphalt area
Total impervious area
Kerby /Hathaway Equation
=
.67 * n * Lo 467
Tc
So
Tc 12.89 min
Tc 16.9 min Kerby / FAA Average
i* 2.26 in/hr 25 year Intensity
i*
2.61
gal
in/hr
50 year Intensity
i�
3.(31
100 year Volume
in/hr
100 year Intensity
D
0.64
in
25 year Depth
D
0.73
in
50 year Depth
D
0.85
in
100 year Depth
V E7,44dgal 25 year Volume
FAA Equation
T Lo
e C)
Soy
Tc 20_83 min
it
V
8,597
gal
50 year Volume
V
9,893
gal
100 year Volume
* intensities taken from Zone G precipitation curves
Calculated by: CAP
NAL F�
4�piSTEgF �'�yF 4?- -7
�Schiess & Associates
CON 5 U L T I N G ENGINEER S
Airport Self Storage
Seven Diamonds Enterprises LLC
Schiess & Associates
Project'No. 07221
I D - one G - Curve Data
25 yr
15 2.45
Interpolation
50 yr
15 2.8
16.92.26 in/hr 16.9 2.61 in/hr
20 1.95
20 2.3
Intensity (in/hr)
5 10 15 20 30
Duration (min)
100 yr
15 3.25
16.93.01 in/hr
20 2.6
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Schiess & Associates
Z6� 3 � CONSULTING ENGINEERS
100
-a
50
0
CL
10
c
D
5
�
2
20 2.3
Intensity (in/hr)
5 10 15 20 30
Duration (min)
100 yr
15 3.25
16.93.01 in/hr
20 2.6
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Schiess & Associates
Z6� 3 � CONSULTING ENGINEERS