Mitchell Lake Association 2011
description
Transcript of Mitchell Lake Association 2011
![Page 1: Mitchell Lake Association 2011](https://reader036.fdocuments.in/reader036/viewer/2022081507/5681671e550346895ddb9ca7/html5/thumbnails/1.jpg)
Mitchell Lake Association2011Mark EnochsSeptember 22, 2011
![Page 2: Mitchell Lake Association 2011](https://reader036.fdocuments.in/reader036/viewer/2022081507/5681671e550346895ddb9ca7/html5/thumbnails/2.jpg)
![Page 3: Mitchell Lake Association 2011](https://reader036.fdocuments.in/reader036/viewer/2022081507/5681671e550346895ddb9ca7/html5/thumbnails/3.jpg)
• “One Water” Resource Management• Citizen Leadership and Priority• Resource Specific• Restore and Protect• Measureable Benefits
![Page 4: Mitchell Lake Association 2011](https://reader036.fdocuments.in/reader036/viewer/2022081507/5681671e550346895ddb9ca7/html5/thumbnails/4.jpg)
![Page 5: Mitchell Lake Association 2011](https://reader036.fdocuments.in/reader036/viewer/2022081507/5681671e550346895ddb9ca7/html5/thumbnails/5.jpg)
2008 & 2009:SolarBee pilot project for hypolimnetic mixingResult: Ineffective mixing
2008: Sediment Oxygen Demand sampling
2009: Community Sediment Oxygen Demand sampling
2009:• Hypolimnetic Oxygenation Pilot. Result: Successful • Calcium Peroxide Addition: Result: Positive, but inconclusive
District Projects in Mitchell Lake…
![Page 6: Mitchell Lake Association 2011](https://reader036.fdocuments.in/reader036/viewer/2022081507/5681671e550346895ddb9ca7/html5/thumbnails/6.jpg)
2008: Weed Harvesting. 272 tons removedMay: Curly leaf pondweed
2009: Weed Harvesting. 732 tons removedMay: Curly leaf pondweedJuly: Eurasian water milfoil
2010: Weed Harvesting. 459 tons removedMay: Curly leaf pondweedJuly: Eurasian water milfoil
District Projects in Mitchell Lake…
1,462 tonstotal
Thank you for weed survey input!
![Page 7: Mitchell Lake Association 2011](https://reader036.fdocuments.in/reader036/viewer/2022081507/5681671e550346895ddb9ca7/html5/thumbnails/7.jpg)
2011 Herbicide Treatment
2011 Herbicide Treatment (almost)
![Page 8: Mitchell Lake Association 2011](https://reader036.fdocuments.in/reader036/viewer/2022081507/5681671e550346895ddb9ca7/html5/thumbnails/8.jpg)
• MLA-initiated. Thank you• 2,4-D was to be used• MnDNR-classifies Mitchell as Natural Environment Lake• Thus, herbicide use by anyone in Mitchell is not
permitted, including…– Individual homeowners– City– District– Others
• MnDNR does allow the use of copper sulfate for algae or snail control, but not for submerged plant control
2011 Herbicide Treatment
![Page 9: Mitchell Lake Association 2011](https://reader036.fdocuments.in/reader036/viewer/2022081507/5681671e550346895ddb9ca7/html5/thumbnails/9.jpg)
9
2011: Paleolimnology – Record of historic water quality from sediment cores
www.also.org
www.laccore.org
www.laccore.org www.laccore.org
![Page 10: Mitchell Lake Association 2011](https://reader036.fdocuments.in/reader036/viewer/2022081507/5681671e550346895ddb9ca7/html5/thumbnails/10.jpg)
Mitchell Lake Lake Reclamation Status
40 µg/l
60 µg/l impaired water threshold
DISTRICT GOAL
CURRENT CONDITIONSSTATE GOAL
PRESETTLEMENT
89 µg/l
![Page 11: Mitchell Lake Association 2011](https://reader036.fdocuments.in/reader036/viewer/2022081507/5681671e550346895ddb9ca7/html5/thumbnails/11.jpg)
• Sedimentation near presettlement value →
Stormwater infrastructure is working
• Sedimentation legacy responsible for current impairment
• Short term (2012 to 2022):
Improve water quality with in-lake methods to counter legacy
• Long term (2022 - 2072):
Incremental adoption of LID in watershed
Mitchell Lake Recommendations
![Page 12: Mitchell Lake Association 2011](https://reader036.fdocuments.in/reader036/viewer/2022081507/5681671e550346895ddb9ca7/html5/thumbnails/12.jpg)
Current Status
![Page 13: Mitchell Lake Association 2011](https://reader036.fdocuments.in/reader036/viewer/2022081507/5681671e550346895ddb9ca7/html5/thumbnails/13.jpg)
Current Status
![Page 14: Mitchell Lake Association 2011](https://reader036.fdocuments.in/reader036/viewer/2022081507/5681671e550346895ddb9ca7/html5/thumbnails/14.jpg)
Lake Reclamation Alternatives
![Page 15: Mitchell Lake Association 2011](https://reader036.fdocuments.in/reader036/viewer/2022081507/5681671e550346895ddb9ca7/html5/thumbnails/15.jpg)
Questions?