Nutrient Runoff Effects on Jordan Lake

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Nutrient Runoff Effects on Jordan Lake

• Brianna Young, Jennifer Jackson and Emily Nurminen

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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

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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

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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 Envtl Management Commission designate
  J. Lake as Nutrient Sensitive Water (NSW)

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Jordan Lake Rules!

• June, 2007- New rules for future construction
  these were the strictest rules for watersheds in
  NCs 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

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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

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Location of the Legacy at Jordan Lake
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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

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Phase I of Build Out
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Phase I

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

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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

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Location of The Legacy at Jordan Lake
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Location of The Legacy at Jordan Lake
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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.

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Catchments of Interest
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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

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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

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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

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L-THIA Steps
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L-THIA Steps
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L-THIA Steps
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L-THIA Steps
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Whats In Store?

• How will the nutrient runoff rates be affected if
  we move the development farther upstream?