This report summarizes a field study that was conducted for the MPCA to collect the data
necessary to support the formulation and validation of a temperature simulation model for urban
stormwater detention ponds. The urban stormwater detention pond simulation model is included
in the MINUHET (Minnesota Urban Heat Transfer) model that computes (simulates) runoff
temperatures for typical residential and commercial watersheds. The model simulates single
rainfall events or continuous periods of several months. The simulated runoff temperatures and
volumes are used to estimate the heat loading from urban surface runoff to coldwater streams. To
support these simulations, weather data and urban runoff temperature data had to be collected to
serve as model inputs and to validate model outputs.
In this report, a subset of the data collection effort is summarized. This report deals with
stormwater detention ponds. The study was conducted in 2005 and 2006. Before a pond was
chosen for detailed study, it was necessary to obtain an overview of typical stormwater detention
ponds in an urban area. Eighteen stormwater detention ponds in Bloomington and Woodbury in
the Twin Cities Metropolitan Area were documented, and are described in this report. Then a
pond was selected for detailed instrumentation and data collection. That pond was on the former
property of the State Farm Insurance Company Headquarters, near I94 and Radio Drive in
Woodbury. The pond is a wet pond with an outflow structure and one major stormsewer inflow
from two parking lots and the roof. Instrumentation was installed to measure and record weather
data, temperature stratification data in the pond, surface inflow and outflow data, pavement
temperature and pavement runoff temperature data.
In support of another study on the fate of road salt in the Twin Cities area, additional data were
collected to document salinity profiles in urban stormwater detention ponds. These data are also
presented in this report.
Herb, William R.; Weiss, Michael P.; Stefan, Heinz G..
Stormwater Detention Pond Water Temperature Data Collection and Interpretation.
St. Anthony Falls Laboratory.
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