Table 12. Total Phosphorus Load Allocations/Reductions for Land Uses and Stream Banks In the UNT SBSF Pine Creek (Annual Values) Pollutant Source Current Allowable Current Allowable Percent Load Loading Rate Loading Load Load Reduction (lbs./yr./acre) Rate (lbs./yr.)) (lbs./yr.) (lbs./yr./acre) 1.1 0.8 102.6 72.5 29.4% Cropland 0.7 0.5 449.5 317.4 29.4% Hay/Pasture 7.1 5.0 29.4% Stream bank - - 204.3 144.3 29.4% Farm Animals - - 13. Total Phosphorus Load Allocations/Reductions for Land Uses and Stream Banks In the UNT SBSF Pine (Daily Values) Pollutant Source Current Allowable Current Allowable Percent Load Loading Rate Loading Load Load Reduction (lbs./d./acre) Rate (lbs./d.) (lbs./d.) (lbs./d./acre) 0.003 0.002 0.281 0.199 29.4% Cropland 0.002 0.001 1.232 0.870 29.4% Hay/Pasture 0.019 0.014 29.4% Stream bank - - 0.560 0.395 29.4% Farm Animals - - Consideration of Critical Conditions The MAPSHED is a continuous simulation model, which uses daily time steps for weather data and water balance calculations. Monthly calculations are made for sediment and nutrient loads, based on daily water balance accumulated in monthly values. Therefore, all flow conditions are considered for loading calculations. Because there is generally a significant lag time between the introduction of sediment to a waterbody and the resulting impact on beneficial uses, establishing this TMDL using average annual conditions is protective of the waterbody. Consideration of Seasonal Variations The continuous simulation model used for this analysis considers seasonal variation through a number of mechanisms. Daily time steps are used for weather data and water balance calculations. The model requires specification of the growing season and hours of daylight for
Table 12. Total Phosphorus Load Allocations/Reductions for Land Uses and Stream Banks In the UNT SBSF Pine Creek (Annual Values) Pollutant Source Current Loading Rate (lbs./yr./acre) Allowable Loading Rate (lbs./yr./acre) Current Load (lbs./yr.)) Allowable Load (lbs./yr.) Percent Load Reduction Cropland 1.1 0.8 102.6 72.5 29.4% Hay/Pasture 0.7 0.5 449.5 317.4 29.4% Stream bank - - 7.1 5.0 29.4% Farm Animals - - 204.3 144.3 29.4% 13. Total Phosphorus Load Allocations/Reductions for Land Uses and Stream Banks In the UNT SBSF Pine (Daily Values) Pollutant Source Current Loading Rate (lbs./d./acre) Allowable Loading Rate (lbs./d./acre) Current Load (lbs./d.) Allowable Load (lbs./d.) Percent Load Reduction Cropland 0.003 0.002 0.281 0.199 29.4% Hay/Pasture 0.002 0.001 1.232 0.870 29.4% Stream bank - - 0.019 0.014 29.4% Farm Animals - - 0.560 0.395 29.4% Consideration of Critical Conditions The MAPSHED is a continuous simulation model, which uses daily time steps for weather data and water balance calculations. Monthly calculations are made for sediment and nutrient loads, based on daily water balance accumulated in monthly values. Therefore, all flow conditions are considered for loading calculations. Because there is generally a significant lag time between the introduction of sediment to a waterbody and the resulting impact on beneficial uses, establishing this TMDL using average annual conditions is protective of the waterbody. Consideration of Seasonal Variations The continuous simulation model used for this analysis considers seasonal variation through a number of mechanisms. Daily time steps are used for weather data and water balance calculations. The model requires specification of the growing season and hours of daylight for
UNT_SBSF_Pine_Creek_TMDL_092618.docx