SEDL / STP / STP1124-EB / STP23579S

Modeling the Reduction of Sediment-Bound Toxics by Detention Basins

Felstul, DR
Consulting Engineers, Inc., Wayzata, MN

Montgomery, JM
Consulting Engineers, Inc., Wayzata, MN

Pages: 11    Published: Jan 1991

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Abstract

A spreadsheet-based computer model was developed to estimate the removal of sediment-bound toxics from stormwater runoff by a detention pond. The model calculates both dynamic and quiescent settling for nine different sediment grain sizes and up to seven toxics associated with them. Since the model tracks each particle size separately, it allows for the increasing proportion of fine particles as stormwater flows through a series of basins. The detention basin's effectiveness at decreasing toxic mass and aqueous concentration, while increasing sediment concentrations, is examined. Based on the modeling results, the METSET model should have wide applicability in testing toxicity reduction strategies for stormwater runoff.