2021 Metro WBIF - Lower MN River North Area Projects - Lynmar Basin (Edina) Stormwater BMP
Lake Edina (Edina), listed as impaired on the MPCA?s impaired waters list, and has experienced documented toxic blue-green algae blooms. NMCWD completed a study in 2019 identifying internal and external nutrient loads to Lake Edina and upstream Lake Cornelia and identified potential projects to reduce those loads to work toward meeting state nutrient standards and reduce the frequency of algal blooms in both lakes. The study results showed that while Lake Edina is highly influenced by the water quality of upstream Lake Cornelia and implementing recommended management strategies for Lake Cornelia will reduce loads to Lake Edina, there were identified opportunities to reduce phosphorus from to the direct watershed of Lake Edina as well. Following the NMCWD managers accepting the study, they directed staff to prepare a feasibility study on the identified projects. To date, several projects have been implemented (or are in the process of being implemented) around Lake Cornelia, including the City of Edina conducting annual herbicide treatments to address curly-leaf pondweed and the District has completed an in-lake alum treatment and is currently assessing goldfish and carp management options to address internal loads. In addition, the District is in the process of designing and construction a stormwater filtration BMP in the city owned Rosland Park, to address watershed-based loading.
The proposed Lynmar Park project would convert a dry detention basin (Lynmar Basin) in a city owned park into an infiltration basin (and provide flood storage) to remove phosphorus from runoff before it reaches Lake Edina and reduce localized flooding. This project will address external loads (comprising up to 35% of the phosphorus load to the lake) coming from an 18-acre urban subwatershed that drains to the lake.
Annie Felix-Gerth
(Watershed Based Implementation Funding)(a) $13,591,000 the first year and $13,375,000 the second year are for performance-based grants with multiyear implementation plans to local government units. The grants may be used to implement projects that protect, enhance, and restore surface water quality in lakes, rivers, and streams; protect groundwater from degradation; and protect drinking water sources. Projects must be identified in a comprehensive watershed plan developed under the One Watershed, One Plan or metropolitan surface water management frameworks or groundwater plans. Grant recipients must identify a nonstate match and may use other legacy funds to supplement projects funded under this paragraph.
The cumulative phosphorus removal over the 30-year life expectancy of the estimated $512,000 project is estimated to be roughly 615 pounds (estimated to be 20.5 pounds annually), an estimated annualized cost per pound of removal of $1,500 (including
LOCAL LEVERAGED FUNDS