SW6091201_401 Certification Application_20091209

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Permit
(to be provided by DWO)
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WDE_ STORMWATER MANAGEMENT PERMIT APPLICATION FORM
NR 401 CERTIFICATION APPLICATION FORM <
INFILTRATION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information.
Phone Number [phone]
Date 11/6/2009
Drainage Area Number 1
II:."DESIGNINFORMATION's< Site Characteristics
Drainage area 43,996.00 n2
Impervious area 25,265.00 n'
Percent impervious 0.57 %
Design rainfall depth 5.52 in e ✓,+t be., Ik rt d Cc - I ,r
Peak Flow Calculations
1-yr, 24-hr rainfall depth
1-yr, 24-hr intensity
Pre -development 1-yr, 24-hr discharge
Post -development 1-yr, 24-hr discharge
Pre/Post 1-yr, 24-hr peak now control
Storage Volume: Non -SA Waters
Minimum design volume required
Design volume provided
Storage Volume: SA Waters
1.5' runoff volume
Pre -development 1-yr, 24-hr runoff volume
Post -development 1-yr, 24-hr runoff volume
Minimum required volume
Volume provided
Soils Report Summary
Soil type
Infiltration rate
SHWT elevation
Basin Design Parameters
Drawdown time
Basin side slopes
Basin bottom elevation
Storage elevation
Storage Surface Area
Top elevation
Basin Bottom Dimensions
Basin length
Basin width
Bottom Surface Area
3.02 in
0.13 in/br
0.04 ff3/sec
0.08 n'/sec
0.04 ft3/sec
11,333.00 n3 05/ny l destya ,S)&t»tr 2"OS3 c.G.
13,123.00 n3 OK for norFSA waters
Sand
✓
24.70
in/hr
',
6.67
first
'�
! V5 ZI L,OD zo 9 . 3 3
Pu pr��s of
2.00
days
OK
3.00
:1
OK
212.50
-fmsl
OK
215.75
fmsl
i
t
�"PO r� "' e1-•l-a /o k /tot rn {, /M.�.=..
6,069.00
n2
216.00
fmsl
204.00 it
31.00 n ✓
1,389.00 n2
Form SW401-Infiltration Basin-Rev.4 Parts 1.811. Design Summary, Page 1 of 2

Permit
(to be provided by DWO)
Additional Information
Maximum runoff to each inlet to the basin?
Length of vegetative filter for overflow
Distance to structure
Distance from surface waters
Distance from water supply well(s)
Separation from impervious soil layer
Naturally occuring soil above shwt
Bottom covered with 4-in of clean sand?
Proposed drainage easement provided?
Capures all runoff at ultimate build -out?
Bypass provided for larger storms?
Pretreatment device provided
2.78
ac-in
NA
It
NA
It
NA
ft
NA
It
NA
It
6.67
It
Y
(Y or N)
Y
(Y or N)
Y
(Y or N)
Y
(Y or N)
Maximum of 2 acre -inches allowed
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
Farm S W 401 Infiltration Basin-Rev.4
Pans 1.8 II. Design Summary, Page 2 of 2