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Best Hills Lake Remediation Recommendations

Best Hills Lake Remediation Recommendations. Jordanne Holst , Nathan Rosenau , and Monique Crumb. Introduction. Massive Macrophyte Growth. Possible Issues. Phosphorous maybe contributing significantly to the growth of macrophytes External loading Internal loading

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Best Hills Lake Remediation Recommendations

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  1. Best Hills Lake Remediation Recommendations JordanneHolst, Nathan Rosenau, and Monique Crumb

  2. Introduction Massive Macrophyte Growth

  3. Possible Issues • Phosphorous maybe contributing significantly to the growth of macrophytes • External loading • Internal loading • Depth of the system allows light to penetrate much of the water column, possibly stimulating macrophyte growth as well Macrophytes from Best Hills reservoir

  4. Hypothesis • We hypothesize that external phosphorous loading from developed land may be significantly contributing to macrophyte growth in Best Hills Lake

  5. Hypothesis • Different buffers may abate nutrient runoff more effectively than others • Obtain information about internal phosphorous loading using chemical profiles

  6. Methods • To determine the profiles of the lake we used a YSI 85 oxygen meter.

  7. Methods • TP (total phosphorous) samples taken at the developed shore, pelagic area, and undeveloped shore, and also in front of different buffers Rock+ Sand No Buffer Rock Sand S1 DAM S2 S3 T1 T2 T3 T4

  8. Phosphorous Results

  9. Profile Results

  10. Discussion • Goals of recommendations • Clear water • Lower macrophyte • growth • More aesthetically • pleasing

  11. Summary • Profiles • anoxic periods • Resulting in increased amounts of readily available phosphorous • Phosphorous concentrations • developed shoreline may not be abating nutrient runoff effectively • one may be more effective than the others

  12. Recommendations • Lake aeration may help to reduce internal phosphorous loading • Buffer strips may help abate nutrient runoff

  13. Aeration • Hypolimentic oxygenation may stop anoxia and limit internal phosphorous loading • $2000 will purchase a small aerator that covers 5 acre • http://www.dripworksusa.com/ev_store/ev_pondaer.php • Quiet • Timer • Self installation is possible

  14. Buffer Strips • Buffer Strips or “Set Asides” • The US Department of Agriculture defines conservation buffers or “buffe strips” as small areas or strips of land in permanent vegetation, designed to intercept pollutants and manage other environmental concerns. • The most commonly referenced size for the buffer strip is 10m, or approximately 33 feet (Ryding et al. 1989). • Can remove up to 50% of TP (USDA &NRCS)

  15. Buffer Strips (cont..) • A narrow strip of shrubs (5-6 ft.) • Decreased fertilizer application in back yards • Several local landscapers, probably $2500-$3500

  16. Riparian Buffer (cont…) • Why is it important to use native plants? • Don’t require fertilizers • Don’t require pesticides • Require less water • Provide shelter and food for wildlife... • http://www.epa.gov/glnpo/greenacres/nativeplants/factsht.html

  17. Riparian Buffer (cont…) • The City of Coeur d'Alene Water Department has teamed up with the NIC Workforce Training Center. • City residential customers who live in their home and who take the "Landscaping with Native Plants" class at NIC this Spring (March 11 and March 18, 2010) can receive a utility bill credit for the cost of the class and the workbook. For More Information: http://northidaho.augusoft.net/index.cfm?method=ClassListing.ClassListingDisplay

  18. Questions?

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