Stormwater Management Standards Manual - Toledo Metropolitan ...

4. Utilize Grass Swales
Where permitted and feasible, open vegetated swales should be used instead of curb and
gutter or hard piping. Grass swales can reduce the peak rate of runoff and improve water
quality.
5. Promote Infiltration of Runoff On-site - Filter Strips
There is potential for the use of infiltration practices that will cause percolation of stormwater
runoff into the ground before it reaches a stream or channel.
6. Promote Infiltration of Runoff On-site – Sand Filters
Routing first flush runoff to a sand filter can reduce the amount of stormwater pollutants
before it is routed to a water quality structure or detention system.
7. Utilize Stormwater Wetlands
Stormwater wetland facilities provide partial treatment of the runoff. The systems remove
pollutants through physical filtration, settling, and biological processes of the wetland plants.
8. Utilize Wet Detention Basins
This structure is the most widely used measure for controlling peak discharges from
developing areas. Wet detention basins can also serve as water quality settling facilities,
which allow pollutants to drop out before water is discharged to a watercourse.
9. Utilize Dry Detention Basins
An extended dry detention basin is a stormwater storage basin that provides temporary
detention, but does not have a permanent pool. The main reasons for use of dry detention
basins are reducing peak stormwater discharges, controlling floods and preventing
downstream channel scouring.
10. Construction of Storm Sewers
After considering all above structural controls, build storm sewers.
Additional Resources
Arendt, R.G., Conservation Design for Subdivisions: A Practical Guide to Creating
Networks, Island Press: Washington, 1996.
Open Space
Third Edition Stormwater Standards Manual September 2008 Page 41