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Crane Lake Watershed Study (for City of Minnetonka)

Blonigen, Laura, Sara Race, Brady Rutman.

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 Minnesota Pollution Control Agency has required that phosphorous, suspended sediments and water volume must be reduced in cities through the use of stormwater BMPs. The scope of this project is the analysis of the Crane Lake Watershed in the City of Minnetonka and a feasibility study to evaluate the use and cost of different best management practices (BMPs). The feasibility study utilizes stormwater modeling to evaluate the BMPs of street sweeping and rain gardens (bioretention devices). The BMPs of in-line ditch treatment and stormwater detention ponds are also analyzed outside of a model. There will also be a full life - cycle analysis that will look at maintenance costs, life spans, and effectiveness of these different BMPs. The ideal locations of the BMPs within the watershed will also be analyzed. In order to more effectively and completely analyze different BMPs in the watershed, a SWMM computer model was constructed from available GIS data.The results of the SWMM simulations helped determine how much TSS, phosphorous, nitrogen, and runoff volume were removed for street sweeping and rain gardens.

The results indicated that street sweeping proved to be the most cost-effective option. Detention ponds and inline treatment were not modeled in SWMM, but average expected results were used as a comparison. For the Crane Lake Watershed, which consistently meets water quality goals for a Level III water body, we advise implementing the most cost-effective options from this study. We recommend increasing the frequency of street sweeping from the current annual interval to monthly or bimonthly sweeping, including sweeping of commercial parking lots when feasible. Increasing the frequency of street sweeping to a monthly or bimonthly interval would remove enough sediment, phosphorus, and nitrogen to ensure that Crane Lake doesn’t degrade in the near future. In addition, if increased water quality of Crane Lake is desired, we strongly recommend a wet detention pond within the Ridgedale subcatchment. The Crane Lake Watershed depends on pollutant reduction from the highly-impervious Ridgedale campus, and wet detention basins and street sweeping are the most cost-effective options.

Publication date: 
Minneapolis: Resilient Communities Project
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.
25 pp.
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