Cooperator: National
Sanitation Foundation International, Waukesha City Group and WDNR
Location: City of Madison Water Works
Project Chief: Judy Horwatich
Project Number: BQY28
Period of Project: July 2005 – December 2007
updated 2/20/07
Problem
Administrative rules to address the control of polluted runoff from urban land-use
activities in Wisconsin went into effect on Oct 2, 2004. Performance standards
in subchapter III of NR151 details total suspended solids (TSS) reductions for
post construction in new development and redevelopment, and describe requirements
to reduce TSS in developed urban areas for all municipalities subject to storm
water permits. Eighty percent of the annual TSS load that would normally run
off a new development site needs to be controlled. The reduction goal for redevelopment
is 40 percent. Municipalities required to control solids loads from developed
urban areas must achieve a 40-percent reduction in the annual TSS loads by 2013.
Objectives
The purpose of this project is to measure the pollutant reduction effectiveness
of a Downstream Defender stormwater treatment device. This is a proprietary treatment
device manufactured by Hydro International. It represents a very common type
of device being promoted for reducing the level of pollutants in urban runoff.
The primary process for removing the pollutants is settling. More than six manufacturers
are offering settling-type devices in Wisconsin.
Results for this project will
be applied to an effort to select and verify a method for sizing single-chamber
settling devices in Wisconsin. Additional pollutant-reduction data are available
from the monitoring of two other settling devices installed in Wisconsin. These
three projects will provide sufficient data to select and verify a sizing method
to be recommended in a technical standard for single-chamber treatment devices.
Progress (January 2006 to June 2006)
Twelve samples were collected. QA/QC has been completed. Calibrations of the
stage sensor and the flow meter have been completed.
Plans (July 2006 to December 2006)
Finish sampling the fifteen storms. Process data and distribute to NSF
group. Begin preparation of a U.S. Geological Survey Report.
Report
A final report will be prepared in FY07
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