Summary of Annual BMP Maintenance Costs from Estimator Models
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BMP USEPA (1999) As percent of construction cost(💲) Weiss et al. (2005) As percent of construction cost(💲) Wossink et al., (2003) C = Cost(💲) X = size of watershed(acre)
Constructed Wetlands 2% 4% - 14.2% C = 4,502X0.153
Wet Detention Basins Not reported 1.9% - 10.2% C = 4,502X0.153
Infiltration Trenches 5% - 20% 5.1% – 12.6% Not reported
Bioretention Basins 5% - 7% 0.7% - 10.9% C = 3,437X0.152
Infiltration Basins 1% - 10% 2.8% - 4.9% Not reported
Dry Ponds <1% 1.8% - 2.7% Not reported
Sand Filters 11% -13% 0.9% - 9.5% C = 10,556X0.534

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