Lake Susan Watershed Treatment and Stormwater Reuse Enhancements
This is a joint grant application from the Riley-Purgatory-Bluff Creek Watershed District and the City of Chanhassen. The project has been identified as most cost effective for the watershed and will consist of modifying an outlet control structure at a higher elevation that will provide increased water quality treatment and the installation of a Minnesota Filter to treat dissolved phosphorus.
Through the installation of proposed practices, this project has resulted in an estimated annual reduction of 23 lbs of phosphorus, .88 tons of sediment, and .25 acre-feet of surface water runoff.
LOCAL LEVERAGED FUNDS
This is a joint grant application from the Riley-Purgatory-Bluff Creek Watershed District (RPBCWD) and the City of Chanhassen. In 2010, the Minnesota Pollution Control Agency listed Lake Susan as a shallow lake impaired for excess nutrients. A 2013 report recommended a project located at the park pond immediately northwest of Lake Susan as the most cost-effective watershed implementation project. The project calls for an outlet control structure at a higher elevation that will provide increased dead pool storage and the installation of a Minnesota Filter to treat dissolved phosphorus. It also represents a high priority site because it has the long-term potential to treat nutrient loading entering the lake from the channel that drains the north and west watershed areas and its proximity to the athletic facility and irrigated parkland will allow for stormwater reuse. Stormwater that is not used for irrigation will receive final polishing with a woodchip bioreactor. This grant project alone will allow the City of Chanhassen and the RPBCWD to achieve more than half of the watershed load reduction goal for Lake Susan.