20071658 Ver 2_More Info Received_20080410

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Transmittal VVETtleivUb,.;c~,~~ J~;v"p,~R®re

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STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be filled out, printed and submitted.

I. PROJECT INFORMATION
Project name Taft Woods East
Contact name Rebecca Peterson
Phone number [phone]
Date April 10, 2008
Drainage area number DA #6
11. DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area 88,814 (t~
Impervious surface area 27,617 ftz
Percent impervious 0.31
Rational C coefficient 0.433
Peak flow from the 1 in/hr storm 0.882838889 cfs
Time of concentration min
Rainfall intensity, 10-yr storm 7.22 in/hr
Peak flow from the 10-yr storm 6.374096778 cfs
Where Does the Level Spreader Discharge?
To a bioretention cell? N (Y or N)
To a wetland? N (Y or N)
To a filter strip or riparian buffer? Y (Y or N) Please complete filter strip characterization below.
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 0 ft
Width of dense ground cover 0 ft
Width of wooded vegetation 50 ft
Total width 50 ft
Slope (from level lip to to top of bank) 3.2
Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area 55.2 sq ft OK
Feet of level lip needed per cfs 65 ft/cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm? Y (Y or N)
Length based on the 10-yr, 24-hr storm? N (Y or N)
Length based on the BMP discharge rate? N (Y or N)
Design flow 0.88 cfs
Is a bypass device provided? Y (Y or N) OK
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Parts I. and II. Design Summary, page 1 of 2

Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr, 24-hr storm
Channel lining material
57.4 ft Level spreader length 0 K
N (Y or N)
N (Y or N)
Y
3 ft
2.84 ft
5.36 ft
0.421 ft
4.7 cfs
bermudagrass /matting
~ w •
,.~ .~
,
t ~-----------
M
~ B ~
1
M
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Parts I. and II. Design Summary, page 2 of 2