TMDL- Implementation strategy & cost.

Section 6.0 Implementation Strategy

Implementation of the Lake Volney TMDL will require significant reductions from non-point sources throughout the watershed. Assigning a predetermined reduction amount per implementation practice is not within the scope of this project. There is not enough research to determine the exact phosphorus reduction realized through implementation of individual BMPs. Rather, a list of potential tasks that could be completed in both agricultural and developed portions of the watershed is provided. Further stakeholder involvement is needed to determine how this TMDL aligns with other local plans (e.g. county water plans). Also, the Intensive Watershed Monitoring (IWM) was initiated in the Cannon River Watershed in 2011. The next few years of study in the Cannon River Watershed will allow for further cooperation between water resource professionals. It will also allow the use of adaptive management, which is an iterative implementation process that makes progress toward achieving water quality goals while using any new data and information to reduce uncertainty and adjust implementation activities.

Restoration options for lakes are numerous with varying rates of success. Consequently, each technology must be evaluated in light of our current understanding of physical and biological processes in that lake. Best estimate using professional judgment and review of other projects in similarly sized watersheds is a range from $1,000,000 to $3,000,000. This estimate will be refined as implementation plans and projects are developed. A list of potential activities by land use is listed below:

Potential Agricultural BMPs to promote:

1) Nutrient management plans

2) Crop residue management

3) Wetland restoration potential. One specific area in need of attention is the wetland to the NE of the lake. Land acquisition has been attempted in the past but this approach should not be abandoned.

4) Identification and targeting of highly erodible lands and promotion of appropriate BMPs

5) Identification of agricultural producers who are willing to implement water retention on their land.

6) Drainage considerations:

a. Determination of potential to redirect drainage outlets through treatment ponds or through water retention basins before directly entering Lake Volney

b. Implement drainage projects that improve/maintain water quality

7) Utilization of the Agricultural BMP Handbook for Minnesota (MDA, 2012)

Potential Developed Land BMPs to promote:

1) Identification of lakeshore property owners that are willing to implement stormwater BMPs on their property (rain gardens, rain barrels, etc.)

2) Determination of the potential to redirect culverts through treatment ponds or through rain gardens before directly entering Lake Volney.

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3) Sewer system audits and upgrades as needed

Potential in-Lake Implementation Activities to promote:

1) Continuation of rough fish harvesting

2) Identification of areas in the littoral zone for re-establishment of native vegetation and implementation

3) Aquatic invasive species and non-native plant management