Summary of Prereservoir Treatments
Nutrients, organic matter, and silt income.
Forces deposition in siltation basin.
Modes of action
Strips silt and nutrients from water by marsh plants.
Precipitates phosphorus in incoming stream.
Highly effective, depending upon method chosen,
Months to years.
Loss of storage capacity of main reservoir if
impoundment basin is constructed.
Maintenance requirements can be extensive.
Wetlands may lose effectiveness and will discharge
Dissolved aluminum and/or aluminum hydroxide
be toxic to reservoir biota.
Unknown because of site specificity.
Not as applicable to high-volume, hydropower
reservoirs as to smaller recreational and potable
water supply reservoirs.