1 / 18

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

morley
Download Presentation

Best Hills Lake Remediation Recommendations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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?

More Related