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Nutrient Runoff Effects on Jordan Lake

Nutrient Runoff Effects on Jordan Lake. Brianna Young, Jennifer Jackson and Emily Nurminen. Jordan Lake Stats. Man-made reservoir initially created as a flood control Now serves as a water source for many surrounding cities such as: Durham, Cary, Apex, Morrisville, RTP, and Chatham County

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Nutrient Runoff Effects on Jordan Lake

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  1. Nutrient Runoff Effects on Jordan Lake Brianna Young, Jennifer Jackson and Emily Nurminen

  2. Jordan Lake Stats • Man-made reservoir initially created as a flood control • Now serves as a water source for many surrounding cities such as: Durham, Cary, Apex, Morrisville, RTP, and Chatham County • Is located within the New Hope and Haw River watersheds

  3. Jordan Lake Stats • Project started in 1945 and was finally flooded in 1983 • Surface area: 13,940 acres (56.4 km2) • Primary source: Haw River • Standard elevation: 216 ft (66m) above sea level

  4. Water Problems • J. reservoir has had very nutrient rich waters since the time of its impoundment • Excessive algal growth • Reservoir has been designated as “impaired” • 1983- NC Envt’l Management Commission designate J. Lake as “Nutrient Sensitive Water” (NSW)

  5. Jordan Lake Rules! • June, 2007- New rules for future construction – these were the strictest rules for watersheds in NC’s history • Major Rules: 1.)reduce annual average N and P loads to the lake from all sources 2.)J. Lake is divided into 3 arms (2 New Hopes and Haw River) 3.)each arm of lake will meet its respective nutrient requirements

  6. Why Do We Give a Hoot? • Important water source • Build-out increasing • Effects of build-out on nutrient loading • Effects of moving build-out further upstream • J. Lake is NSW • Increasing dependence on J. Lake • Diverse wildlife

  7. Location of the Legacy at Jordan Lake

  8. The Legacy • Construction began 2006 • Located along the western shore of J. Lake within the New Hope Basin • Residential community with total of 436 lots covering 628 acres (including golf course) • 3 phases of construction

  9. Phase I of Build Out

  10. Phase I • 3 sub-phases: • Legacy Falls (26 lots) • Legacy Hills (34 lots) • Legacy Park (43 lots) • Total: 105 lots, 238 acres

  11. Phase II & III • Phase II • Avg lot size: 23, 681 ft2 • 82.52 acres • 54 lots • Phase III • Avg lot size: 25,633 ft2 • 83.01 acres • 60 lots

  12. Location of The Legacy at Jordan Lake

  13. Location of The Legacy at Jordan Lake

  14. GIS Aspect We used GIS to extract the watershed basin we were going to focus on so that we could obtain the NLCD landcover data for the catchments the development was going to be in.

  15. Catchments of Interest

  16. The Process • Clipped Haw River and New Hope watersheds from a file containing the entire water network for the Southeast U.S. • Overlaid NHD water body to locate Jordan Lake • Overlaid files for primary, secondary, and local roads to get an exact location • Overlaid catchment data • Added NHD flowline attributes data table • Overlaid NED file for the area to view the elevation of catchments

  17. The Process • Joined catchment shapefile with NLCD flowline attributes to get CUMNLCD • Used identify function to select catchment of interest and obtain information about landcover • Compiled data to get total values

  18. NLCD Classifications 11 Open Water 12 Perennial Ice/Snow 21 Developed, Open Space 22 Developed, Low Density 23 Developed, Medium Density 31 Bare Rock/Sand/Clay 32 Quarries/Strip Mines/Gravel Pits 33 Transitional 41 Deciduous Forest 42 Evergreen Forest 43 Mixed Forest 51 Shrub 61 Orchards/Vineyards/Other 71 Grassland/Herbaceous 81 Pasture/Hay 82 Row Crops 83 Small Grains 84 Fallow 85 Urban/Recreational Grasses 91 Woody Wetlands 92 Emergent Herbaceous Wetlands

  19. L-THIA Steps

  20. L-THIA Steps

  21. L-THIA Steps

  22. L-THIA Steps

  23. What’s In Store? How will the nutrient runoff rates be affected if we move the development farther upstream?

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