Water, Wastewater & Stormwater

Oral

395048 - Moody Lake Adaptive Management Water Quality Improvement Project

Thursday, June 7
8:30 AM - 10:00 AM
Location: Greenway EF
Co-Authors: Meghan Funke, 7030 6th St N, Oakdale, MN 55128 – Emmons & Olivier Resources; Greg Graske, 7030 6th St N, Oakdale, MN 55128 – Emmons & Olivier Resources

The Comfort Lake-Forest Lake Watershed District (District) is located in the northeast area of the Twin Cities. In order to maximize limited public dollars in implementing capital projects, the District uses an adaptive management approach. This approach has resulted in the implementation of numerous cost-effective projects. This includes six different filter projects, of which five were iron enhanced sand filters.

A good example of the use of adaptive management is in the Moody Lake subwatershed. Following the completion of a TMDL, the District conducted intensive watershed monitoring. The monitoring identified phosphorus rich layers of nutrients in several inline wetlands which accounted for 75% of the watershed phosphorus load.

Following the excavation of the enriched layers of the degraded wetlands, effectiveness monitoring results showed a reduction in discharge phosphorus concentrations from 0.63 mg/L pre-excavation to 0.26 mg/L post-excavation, with an ultimate goal of 0.2 mg/L.

Phase 2 is expected to bring Moody Lake’s mean summer phosphorus concentration down from 128 g/L to 40 g/L. The total life cycle costs are calculated at about $50/lb. of phosphorus reduced and will improve downstream water bodies.

Adaptive management is the core element of the District’s approach to water resource management and filters such as IESF are critical to reaching both urban and rural water quality goals. Cost-effectiveness is a key consideration for water quality projects, and several other projects are helping the District achieve similar progress toward goals lbs./unit reduction cost.

Meghan Funke, PhD

Limnologist
Emmons & Olivier Resources, Inc.

Presentation(s):

Send Email for Meghan Funke

Mike Kinney, MS/CCA

District Administrator
Comfort Lake-Forest Lake Watershed District

Presentation(s):

Send Email for Mike Kinney


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395048 - Moody Lake Adaptive Management Water Quality Improvement Project



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