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About the Map: Hurricane Florence Soaks CAFOs and Animal Waste Pits Along North Carolina’s Coastal Plain

About the Map: Hurricane Florence Soaks CAFOs and Animal Waste Pits Along North Carolina’s Coastal Plain

Data provided on the maps represent estimations of locations and statistics in an attempt to accurately document CAFOs and their impact on the landscape. EWG and Waterkeeper Alliance assume no responsibility for locational accuracy, errors or omissions represented on the maps.

Animal Feeding Operation Attributes

  • September 14-16, 2018 estimated rainfall: Derived from intersecting Quantitative Precipitation Forecasts (QPFs) surfaces derived by NOAA – National Weather Service, 24-Hour Forecast with approximate animal feeding operation locations.
  • County: North Carolina county in which animal feeding operation exists.
  • Facility Type: Animal operation category (i.e. SWINE, POULTRY, and CATTLE) from “REGULATED OPERATION” of the N.C. Department of Environmental Quality List of Permitted Animal Facilities (January 2018), or Poultry - compiled by the Waterkeeper Alliance contracted by Justin S. Quinlivan (2015).
  • Estimated Animal Count: Animal count from “ALLOWABLE COUNT” of the N.C. Department of Environmental Quality List of Permitted Animal Facilities (January 2015), or aggregated count of highest number of poultry types (broiler, layer, pullet, turkey) between 2007 and 2012 from Poultry - Inventory and Sales USDA AG Census 2007 and 2012.
  • Estimated Waste Output: Annual estimated waste output calculated using the 2016 North Carolina Agricultural Chemicals Manual, specifically Chapter IV-Fertilizer Use, page 62,“Livestock & Poultry Manure Production Rates and Nutrient Content.” See WASTE ESTIMATE METHODOLOGY below for more information.

Lagoon Attributes

Waste Lagoons - Data representing the perimeter measurements of waste lagoons were compiled by EWG. Lagoons polygons were heads-up digitized using 2014 USDA NAIP aerial photography. The North Carolina Department of Environment and Natural Resources Division of Water Quality Swine Lagoon point layer served as a proxy for known swine lagoons. Visible lagoons on aerial photography not marked with the N.C. point layer were also capture and classified as unknown.

  • September 14-16, 2018 estimated rainfall: Derived from intersecting Quantitative Precipitation Forecasts (QPFs) surfaces with the derived by NOAA – National Weather Service, 24-Hour Forecast.
  • Area: Square acres of lagoon surface.
  • Exceeded 14 hour 25 year event: Derived from intersecting Quantitative Precipitation Forecasts (QPFs) surfaces with Isopluvials of 24 hour precipitation (inches) with Average Recurrence Interval of 25 years both derived by NOAA – National Weather Service, 24-Hour Forecast.
  • Estimated storage volume: Derived by taking the square footage (Length x Width) x Average Depth (assumed 8 ft.) x Volume in US Gallons per cubic foot (7.5)

Waste Estimate Methodology

Poultry Waste Estimates

To calculate poultry waste, EWG took the highest county-level estimates found in the USDA Agricultural Census between 2007 and 2012 for “Pullet,” “Turkey,” “Layer” and “Broiler.” Those county-level numbers were then evenly distributed by the number of poultry barns associated with an individual operation in the county, as documented by Waterkeeper Alliance. Manure outputs were calculated using the specific poultry type and count from the 2016 North Carolina Agricultural Chemicals Manual, specifically Chapter IV-Fertilizer Use, page 62, “Livestock & Poultry Manure Production Rates and Nutrient Content” (see Figure 1 below).

FIGURE 1- MANURE VOLUME AND WEIGHT IN TYPICAL NORTH CAROLINA ANIMAL PRODUCTION SYSTEMS

Swine Waste Estimates

To calculate swine waste, EWG used permit data from the North Carolina Department of Environmental Quality to determine animal type and count. Manure outputs were calculated using the specific type and count from the 2016 North Carolina Agricultural Chemicals Manual, specifically Chapter IV-Fertilizer Use, page 62, "Livestock & Poultry Manure Production Rates and Nutrient Content." For animal types that did not appear on the 2016 North Carolina Agricultural Chemicals Manual, EWG used manure metrics for a similar type of animal. This was done for Swine - Boar/Stud, Swine – Gilts, and Swine – Other (see Figure 2 below).

FIGURE 2- - MANURE VOLUME AND WEIGHT IN TYPICAL NORTH CAROLINA ANIMAL PRODUCTION SYSTEMS

Cattle Waste Estimates

To calculate cattle waste, EWG used the permit data from the North Carolina Department of Environmental Quality to determine animal type and count. EWG manure outputs were calculated using the specific type and count from the 2016 North Carolina Agricultural Chemicals Manual, specifically Chapter IV-Fertilizer Use, page 62, “Livestock & Poultry Manure Production Rates and Nutrient Content.” For animal types that did not appear on the 2016 North Carolina Agricultural Chemicals Manual, EWG used manure metrics for a similar type of animal. This was done for Cattle - Dry Cow (see Figure 3 below).

FIGURE 3- - MANURE VOLUME AND WEIGHT IN TYPICAL NORTH CAROLINA ANIMAL PRODUCTION SYSTEMS