Five tracer runs were performed on a detention pond and wetlands system to determine mixing and residence times in the system. The data indicate that at low discharges and with large amounts of storage, the pond is moderately mixed with residence times not much less than the theoretical maximum possible under complete mixing. At higher discharges and with less storage in the pond, short-circuiting occurs, reducing the amount of mixing in the pond and appreciably reducing the residence times. The time between pond outlet peak concentrations and wetlands outlet peak concentrations indicate that in the wetlands, mixing increases with decreasing discharge and increasing storage.
Additional publication details
Mixing and residence times of stormwater runoff in a detection system
Publ by ASCE
New York, NY, United States
Proceedings of an Engineering Foundation Conference on Current Practice and Design Criteria for Urban Quality Control