J- -14-01 STORMWATER MANAGEMENT REPORT-ANNAPOLIS
Updated
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File name: J-1604000-14-01 STORMWATER MANAGEMENT REPORT-ANNAPOLIS JANUARY 2017.pdf
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ATTACHMENT 1604000-14-01
STORMWATER MANAGEMENT REPORT-ANNAPOLIS JANUARY 2017
BMP ID#:
SWM-1
Name:
Bishop Stadium Baseball Field (Bldng. 146)
Type:
Bioretention
Location:
280 Wainwright Road, Building 146A (Lat. 38.98631, Long -76.49481)
TOPIC
General
Information
DETAIL
Year Installed
Drainage Area
Impervious Area
Total Area Treated
Treated Storm/Rainfall
Proposed Flow
Pollutants Treated
Load Removal Design
Shape
Length, Width, Depth
Slope(s)
Capacity (Water Quality Volume)
Inflow Pipe Length/Diameter
Forebay Volume
Design Details
Forebay Media Type/Thickness
Spillway
Bioretention Media Type/Thickness
Wellcap / Observation Well
Vegetative Cover Type / Landscaping
Underdrain Details
Outflow Pipe Length/Diameter
Frequency
Maintenance
Mulch replacement and
redistribution of top few inches
Pruning and replacement of dead
vegetation
Trash Removal
Sediment, Leaves and Debris
Removal
INFORMATION
2007 (date on as-builts)
56,455 sf / 1.30 acres
13,965 sf /0.32 acres (design drawings)
56,455 sf / 1.30 acres (design drawings)
1” rainfall
10.8 ft/s in concrete channel prior to BMP
Total Phosphorus, Metals, TKN, Total Suspended Solids,
Organics, Bacteria, Trash/Debris
Phosphorus: 0.56 lbs/year (required 0.25 lbs/yr)
Rectangular sediment forebay, oval bioretention
Bioretention: 40’ x 26’ x 3.75’ and forebay: 25’ x 10’ x 4.92’
Berm side slopes 3:1; Drainage area slope: 36%, concrete channel slope: 2 %
provided: 1,592 cf, 923 sf of Filter bed (1,317 cf and 823 sf of filter bed needed); Recharge Volume: 171 cf
15”D x approximately 130 ft length
0.25 x 1,317 cf = 330 cf
4” Pea Gravel, followed by 4.67’ of #2 Stone surrounded by filter cloth on all four sides.
Between forebay and bioretention, 7’ wide, sod covered. 4” Mulch Layer, followed by 2.5’ of planting soil, filter fabric, and 12 inches of gravel enclosing a 6” perforated pipe (outlet pipe).
Concrete D Type Inlet with manhole
River Birch (Betula nigra), Bayberry (Myrica
pennsylvanica), Woolgrass (Scirpus cyperinus), and Blue Flag (Iris versicolor)
Underdrains to be placed on a 3’ wide section of filter cloth. Pipes inside gravel bedding at a min slope of 0.5%. 12”D x~ 34 ft length (connects to existing 18” Stormdrain) Regularly inspection is needed for signs of erosion,
obstructions, and/or unhealthy vegetation.
Annually when located in parking lots or roads, when
water ponds for more than 48 hours, otherwise as
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