Page 463 - Fair, Geyer, and Okun's Water and wastewater engineering : water supply and wastewater removal

JWCL344_ch12_398-456.qxd 8/4/10 9:37 PM Page 421

12.5 Urban Runoff Control Practices 421

Wetland buffer
(25 ft minimum)
Emergency
Limit 25% of pond 25´
perimeter open grass Safety spillway
bench

Weir wall
Forebay Outfall
Micropool
Inflow Waterfowl
island

Riser/barrel
Riser in
Maintenance embankment
access road
High marsh (less
25´ wetland buffer 25´ than 6˝ water depth)
landscaped with native
Low marsh (water
trees/shrubs for habitat
depth between 6˝and 18˝)
Plan view
Embankment
Wetlands high marsh
Riser Emergency
Extreme flood control
spillway
Overbank flood control
Channel protection
WQ v level Permanent
pool
Inflow Stable
outfall
Forebay
Gabion wall Pond drain
Low marsh Reverse pipe Barrel
Anti-seep collar or
filter diaphragm
Profile
Figure 12.8 Example of a Shallow-Constructed Wetland System Design for Stormwater.

Conversion factors: 1 1 in. 25.4 mm; 1 1 ft 0.3048 m

(Source: New York Department of Environmental Conservation)

Baffle or
skimmer Treatment Outflow
Inflow Volume ( 18 in) Oil/grease
Littoral skimmer
zone (3.5 ft)
Slope (10:1 desirable;
4:1 minimum)
Sediment sump
Deeper area
Figure 12.9 Example of a Wet Detention System Design for Stormwater.
Conversion factors: 1 in. 25.4 mm; 1 ft 0.3048 m
(Source: Florida Department of Environmental Regulation)