Paper No. JAWRA-08-0219-P of the Journal of the American Water Resources Association (JAWRA). Discussions are open until six months from print publication.
Simulation of Temperature Mitigation by a Stormwater Detention Pond1
Version of Record online: 19 AUG 2009
© 2009 American Water Resources Association
JAWRA Journal of the American Water Resources Association
Volume 45, Issue 5, pages 1164–1178, October 2009
How to Cite
Herb, W. R., Mohseni, O. and Stefan, H. G. (2009), Simulation of Temperature Mitigation by a Stormwater Detention Pond. JAWRA Journal of the American Water Resources Association, 45: 1164–1178. doi: 10.1111/j.1752-1688.2009.00354.x
- Issue online: 5 OCT 2009
- Version of Record online: 19 AUG 2009
- Received November 26, 2008; accepted May 11, 2009.
- stormwater management;
- best management practices
Abstract: A numerical model has been developed to simulate the hydraulic and heat transfer properties of a stormwater detention pond, as part of a simulation tool to evaluate thermal pollution of coldwater streams from stormwater runoff. The model is dynamic (unsteady) and based on principles of fluid mechanics and heat transfer. It is driven by hourly weather data, and specified inflow rates and temperatures. To calibrate and validate the pond model field data were collected on a commercial site in Woodbury, Minnesota. The relationship between pond inflow and outflow rates to precipitation was effectively calibrated using continuously recorded pond levels. Algorithms developed for surface heat transfer in lakes were found to be applicable to the pond with some modification, resulting in agreement of simulated and observed pond surface temperature within 1.0°C root mean square error. The use of an unshaded pond for thermal mitigation of runoff from paved surfaces was evaluated using the pond model combined with simulated runoff from an asphalt parking lot for six years of observed rainfall events. On average, pond outflow temperature was 1.2°C higher than inflow temperature, but with significant event-to-event variation. On average, the pond added heat energy to runoff from an asphalt parking lot. Although the pond added total heat energy to runoff, it did reduce the rate of heat outflow from the pond by an order of magnitude due to reductions in volumetric outflow rate compared with the inflow rate. By reducing the rate of heat flow, the magnitude of temperature impacts in a receiving stream were also reduced, but the duration of impacts was increased.