Stormwater Quality Design Manual (May 2007) - City of Sacramento ...

Runoff Treatment Control Measure Fact SheetConstructed Wetland BasinLong-Term MaintenanceThe local permitting agencies in the Sacramento and South Placer areas will require execution of amaintenance agreement or permit with the property owner for projects including a constructed wetlandbasin. Check with the local permitting agency about the timing for execution of the agreement. Suchagreements will typically include requirements such as those outlined in Table CWB-3. The propertyowner or his/her designee will be responsible for compliance. See Appendix B for additional informationabout maintenance requirements and sample agreement language.Table CWB-3.Inspection and Maintenance Recommendations for Constructed Wetland BasinsActivityScheduleInspect basin to identify potential problems such as trash and debrisaccumulation, damage from burrowing animals, and sedimentaccumulation.Remove litter and debris from constructed wetland basin area.Stock basin with mosquito fish to enhance natural mosquito and midgecontrol. Contact the local vector control district for assistance.Harvest vegetation for vector control and to maintain open water surfacearea.Remove sediment from forebay and other zones when accumulationreaches 10 percent of original design depth or if resuspension isobserved. (Note: Sediment removal may not be required in the main poolarea for as long as 20 years.)Reconstruct or replace the control measure when it is no longerfunctioning properly.At beginning and end of the wet season.Additional inspections after periods ofheavy runoff are desirable.As requiredAs requiredAnnually or more frequently if requiredClean in early spring so vegetationdamaged during cleaning has time toreestablish.See projected lifespan in Appendix B forinformational purposes.Stormwater Quality Design Manual for the Sacramento and South Placer RegionsMay 2007CWB-7