Orange Wayne Goldsboro Havelock Kinston New Bern Raleigh Smithfield Wilson aforementioned counties Falls and Jordan across whole watershed (no location rules) apply across whole watershed (no location rules) : Buydown Thresholds for the Different Nutrient Management Watersheds Watershed Owner Type Residential‡ Buydown Threshold Non-Residential‡ Buydown Threshold Nitrogen Phosphorus Nitrogen Phosphorus Tar-Pamlico All Types 6 lb N/ac/yr None 10 lb N/ac/yr None Neuse All Types 6 lb N/ac/yr None 10 lb N/ac/yr None Jordan State & federal 4 lb N/ac/yr None 8 lb N/ac/yr None All Others 6 lb N/ac/yr None 10 lb N/ac/yr None Falls See Disturbance Threshold Table See Disturbance Threshold See Disturbance Threshold Table See Disturbance Threshold Table See Disturbance Threshold Table ‡ “Residential” for Tar-Pamlico and Neuse includes Single-Family, Duplex, and Multi-Family Residential. For Jordan and Falls “Residential” includes only Single Family and Duplex. Table : Nutrient Export Targets for the Different Nutrient Management Watersheds Watershed Subwatershed Nitrogen Export Target Phosphorus Export Target Tar-Pamlico All 4 lb/ac/yr 0.4 lb/ac/yr All except Falls 3.6 lb/ac/yr no P export target
Wilson Wilson, NC Winston and Hunt 2017 6,6 1.26 0.17 Site I Charlotte, NC Wu et al. 1998 10,10 3.67 0.43 Site II Charlotte, NC Wu et al. 1998 10,10 1.40 0.52 Site III Charlotte, NC Wu et al. 1998 10,10 1.14 0.47 HWY Savage, MD Stagge et al. 2012 6,6 5.53 0.55 HWY-CD Savage, MD Stagge et al. 2012 27,27 4.80 0.34 Road Benson, NC Powell 2015 27,0 1.02 Site A Johnston County, NC Winston et al. 2012 24,0 1.48 Site B Johnston County, NC Winston et al. 2012 23,0 1.66 Site C Sampson County, NC Winston et al. 2012 20,0 2.03 Site D Duplin County, NC Winston et al. 2012 20,0 2.60 Table 12 displays the study data TN and TP concentration values for the parking-, driveway-, and sidewalk-type land cover, as well as the references from which the values were derived. Parking lots and driveways of all types of pavement, excluding permeable pavement. Because there was limited data for sidewalks, but were similar to those for parking, NCSU researchers decided to combine those values with parking and driveway data. Table : Average concentrations used to compute representative pollutant concentrations for parking-, driveway-, and sidewalk-type land covers. Site Location Source Number of Samples (N,P) Ave Conc N (mg/L) Ave Conc P (mg/L) Florida Aquarium F1 Tampa, FL Rushton 2001 30,30 0.56 0.11 Florida Aquarium F2 Tampa, FL Rushton 2001 30,30 0.55 0.11 Char Charlotte, NC Passeport and Hunt 2009 26,26 1.83 0.20 Kin1 Kinston, NC Passeport and Hunt 2009 15,15 1.13 0.10 Kin2 Kinston, NC Passeport and Hunt 2009 11,11 1.14 0.07
University Park Plot_B University Park, PA Harrison et al. 1993 21,17 2.76 1.41 1994 Plots University Park, PA Linde Watschke 1997 7,0 1.93 1995 Plots University Park, PA Linde Watschke 1997 8,0 1.77 Residential Lawn Madison, WI Bannerman et al. 1993 - 2.67 Lifetime Fitness Raleigh, NC Stillwell 8,8 2.38 0.41 Golf Course Indian River Lagoon / St. Lucie, Estuary, FL Graves and Fike 2004 28,28 1.62 0.24 Golf Course NC Neuse River basin, NC Line et al. 2002 18,18 7.87 1.07 Residential Lawn Madison, WI Bannerman et al. 1993 -- 2.67