20061223 Ver 2_Staff Comments_20061207

Project Name: Brookstone
Project No. DWQ 061223 ~(~ (~/L ~'
SUBMITTED DESIGN. REQUIRED DESIGN:
elevations
Permanent Pool (ft) 48 3
Temporary Pool (ft) 48.94 0.94 ft. depth ok
areas
Permanent Pool SA (sq ft) 4 7862 sq. ft. check surfac
Drainage Area (ac) 1
Impervious Area (ac) 24.5 % -
Forebay (ft2) 27 14.74359 % ok
High Marsh (ft2) 2546 33.3 % ok
Low Marsh (ft2) 2796 36.6 % ok
Micropool (ft2) 1175 15.371533 % ok
100
volumes
Temporary Pool (cu ft) 15250 15593 cu. ft. check tempo
other parameters
SA/DA 1.1 1.14 -
Orifice Diameter (in) 1.5 0.04 cfs drawdown -
Design Rainfall (in) T 4.4 day drawdown ok
Linear Interpolation of Correct SA/DA
3 ft. Permanent Pool Depth
Im ervious SA/DA from Table
Next Lowest 20 0.97
Project Impervious 24.5 1.14
Next Highest 30 1.34
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Project Name: Brookstone
Project No. DWQ 061223
~~,
SUBMITTED DESIGN: REQUIRED DESIGN:
elevations
Permanent Pool (ft) 48 3
Temporary Pool (ft) 48.81 0.81 ft. depth ok
areas
Permanent Pool SA (sq ft) 1 45 7862 sq. ft. ok
Drainage Area (ac) 15
Impervious Area (ac) 24.5 % -
Forebay (ft2) 3 15.302078 % ok
High Marsh (ft2) 3466 33.5 % ok
Low Marsh (ft2) 3724 .36.0 % ok
Micropool (ft2) 1572 15.195747 % ok
100
volumes
Temporary Pool (cu ft) 15250 15593 cu. ft. check tempo
other parameters
SA/DA 1.5 1.14 -
Orifice Diameter (in) 1.75 0.05 cfs drawdown -
Design Rainfall (in) 1 3.5 day drawdown ok
Linear Interpolation of Corr ect SA/DA
3 ft. Permanent Pool Depth
Im ervious SA/DA from Table
Next Lowest 20 0.97
Project Impervious 24.5 1.14
Next Highest 30 1.34