Abstract

A two-dimensional, vertically averaged hydrodynamic model has been adapted to compute the circulation and sedimentation patterns in stormwater detention ponds or other water impoundment facilities. This model is an improvement over the existing plug flow models based on a series of constantly stirred tank reactors (CSTR) that cannot predict circulation patterns in ponds and reservoirs. The Circulation and Water Quality Model (CWQM) can identify areas in the pond where short-circuiting and dead zones occur. Sedimentation, based on first-order decay, can be predicted. The sedimentation model is applied to an existing stormwater pond, and agreement was found between the predicted suspended solids (SS) concentration at the outlet and monitored outlet concentrations. Application of the model for evaluating a stormwater pond retrofit design is described below.

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