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The CURA publications library is currently being digitized by the University of Minnesota Digital Conservancy. When the project is complete, the entire CURA publications library will be online and fully searchable. Unfortunately, during this process we are not able to honor individual requests for publications . Additionally, we no longer have physical copies of publications to send out.

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Glen Lake Watershed: Water Quality Control Measures. (for City of Minnetonka)

Author: 
Iversen, Adam, Nicholas Bad Heart Bull, Kevin Lachowitzer, Kevin Nerem.

Produced by students in CE 5511: Urban Hydrology and Land Development (Instructor John Gulliver, Civil Engineering) as part of the 2012-2013 Resilient Communities Project partnership with the City of Minnetonka.

The City of Minnetonka is considering augmenting and installing new best management practices (BMPs) for the Glen Lake watershed. Common BMPs are street sweeping, in-sewer treatment (such as hydrodynamic separators), and bio-retention low impact development (LID). Street sweeping and hydrodynamic separators were given priority in research. Since there was limited public land, research into the installation of bio-retention LIDs was limited.

Street sweeping was found to be an effective best management practice when it was performed on a regular basis. Also, it was concluded that the type of street sweeper greatly affects the amount and type of debris removal. Street sweeping as a best management practice was found to be very cost effective. With weekly sweeping, over 51,000lbs of solids can be removed annually at an estimated annual cost of $15,960.

Results of the study show that hydrodynamic separators, such as the SAFL Baffle, can greatly increase the amount of sediment reduction. With yearly maintenance, SAFLs Baffles can outperform regular sumps by a factor of 2 to 3. For a sump retrofit project estimated at $4,000, the SAFL Baffle can remove 53lbs of total suspended solids (TSS) annually. Also, it was found SAFL Baffles and sumps are more efficient in smaller watershed areas. In a study of 3, 10, and 30 acres, the 3 acre watershed provided the greatest performance in removal efficiency, in which case a $10,000 installation project can yield a 20lb annual TSS reduction.

Publication date: 
2013
Publisher: 
Minneapolis: Resilient Communities Project.
Sponsor: 
This project was supported by the Resilient Communities Project (RCP), a program at the University of Minnesota that convenes the wide-ranging expertise of U of M faculty and students to address strategic local projects that advance community resilience and sustainability. RCP is supported by the Center for Urban and Regional Affairs (CURA) and the Institute on the Environment.
Pages: 
22 pp.
Online availability
CURA call number: 
RCP-011

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