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Appendix B: Best Management Practices and Load Reduction Efficiencies Used in the Watershed Model
Pages 187-204

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From page 187...
... Appendix B Best Management Practices and Load Reduction Efficiencies Used in the Watershed Model 187
From page 188...
... Efficiency Enhanced nutrient management Efficiency Decision agriculture Efficiency High-till Efficiency Low-till Efficiency Conservation plans All hay Efficiency Pasture Efficiency Cover crops Efficiency Commodity cover crops Efficiency Stream access control with fencing Land-use change Alternative watering facility Efficiency Prescribed grazing/PIRG Efficiency Horse pasture management Efficiency Animal waste management livestock Efficiency Animal waste management poultry Efficiency Barnyard runoff control Efficiency Loafing lot management Efficiency Mortality composters Efficiency Water control structures Efficiency Poultry phytase Application reduction Swine phytase Application reduction Dairy precision feeding and forage management Application reduction Poultry litter transport Application reduction
From page 189...
... (N/A) 8% 15% 25% 3% 5% 8% 3% 5% 8% 5% 10% 14% Varies Varies Varies Varies Varies Varies N/A N/A N/A 5% 8% 10% 9% 24% 30% N/A 20% 40% 75% 75% N/A 75% 75% N/A 20% 20% 40% 20% 20% 40% 40% 10% N/A 33% N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A Continued
From page 190...
... Efficiency Resource BMPs How redited Forest harvesting practices Efficiency Dirt & gravel road erosion & sediment control -- Mass reduction/length Driving surface aggregate + raising the roadbed Dirt & gravel road erosion & sediment control -- Mass reduction/length with outlets Dirt & gravel road erosion & sediment control -- Mass reduction/length outlets only Urban BMPs How credited Forest conservation Land-use change Urban growth reduction Land-use change Impervious urban surface reduction Land-use change Forest buffers Efficiency, land-use change Tree planting Land-use change Abandoned mine reclamation Land-use change Wet ponds and wetlands Efficiency Dry detention ponds and hydrodynamic structures Efficiency Dry extended detention ponds Efficiency Infiltration practices w/o sand, vegetation Efficiency Infiltration practices w/ sand, vegetation Efficiency Filtering practices Efficiency Erosion and sediment control Efficiency Nutrient management Efficiency Street sweeping Efficiency Urban stream restoration Load reduction/length
From page 191...
... 191 APPENDIX B TN TP SED Reduction Reduction Reduction Efficiency Efficiency Efficiency 15-60% N/A N/A 25% 0% 0% 25% 0% 0% 40% 0% 0% TN TP SED Reduction Reduction Reduction Efficiency Efficiency Efficiency 50% 60% 60% 0 0 2.96 lb/ft 0 0 3.6 lb/ft 0 0 1.76 lb/ft TN TP SED Reduction Reduction Reduction Efficiency Efficiency Efficiency N/A N/A N/A N/A N/A N/A N/A N/A N/A 25% 50% 50% N/A N/A N/A N/A N/A N/A 20% 45% 60% 5% 10% 10% 20% 20% 60% 80% 85% 95% 85% 85% 95% 40% 60% 80% 25% 40% 40% 17% 22% N/A 3% 3% 9% 0.02 lb/ft 0.003 lb/ft 2 lb/ft Continued
From page 192...
... 192 NUTRIENT AND SEDIMENT REDUCTION GOALS IN THE CHESAPEAKE BAY TABLE B-1 Continued Urban BMPs How Credited Septic connections Systems change Septic denitrification Efficiency Septic pumping Efficiency C/D soils, underdrain Efficiency Bioretention A/B soils, underdrain Efficiency A/B soils, no underdrain Efficiency Vegetated open channels C/D soils, no underdrain Efficiency A/B soils, no underdrain Efficiency Bioswale Efficiency Permeable pavement w/o sand, C/D soils, underdrain Efficiency vegetation A/B soils, underdrain Efficiency A/B soils, no underdrain Efficiency Permeable pavement w/ sand, C/D soils, underdrain Efficiency vegetation A/B soils, underdrain Efficiency A/B soils, no underdrain Efficiency BMPs Hydrogeomorphic region(s) Forest buffers Appalachian plateau siliciclastic non-tidal Blue Ridge non-tidal; mesozoic lowlands non tidal; valley and ridge carbonate non-tidal Coastal plain dissected uplands non-tidal Coastal plain dissected uplands tidal; coastal plain lowlands tidal; coastal plain uplands tidal; Piedmont crystalline tidal Coastal plain lowlands non-tidal Piedmont crystalline non-tidal Coastal plain uplands non-tidal Piedmont carbonate non-tidal Valley and ridge siliciclastic non-tidal
From page 193...
... 193 APPENDIX B TN TP SED Reduction Reduction Reduction Efficiency Efficiency Efficiency N/A N/A N/A 50% N/A N/A 5% N/A N/A 25% 45% 55% 70% 75% 80% 80% 85% 90% 10% 10% 50% 45% 45% 70% 70% 75% 80% 10% 20% 55% 45% 50% 70% 75% 80% 85% 20% 20% 55% 50% 50% 70% 80% 80% 85% TN TP SED Reduction Reduction Reduction Efficiency Efficiency Efficiency 54% 42% 56% 34% 30% 40% 65% 42% 56% 19% 45% 60% 56% 39% 52% 56% 42% 56% 31% 45% 60% 46% 36% 48% 46% 39% 52% Continued
From page 194...
... Coastal plain dissected uplands non-tidal; coastal plain dissected uplands tidal; coastal plain lowlands tidal; coastal plain uplands tidal; coastal plain lowlands non tidal; coastal plains uplands non-tidal Blue Ridge non-tidal; Mesozoic lowlands non-tidal; valley and ridge carbonate non tidal; Piedmont crystalline tidal; Piedmont crystalline non-tidal; Piedmont carbonate non-tidal Continuous no-till Coastal plain dissected uplands non-tidal; coastal plain dissected uplands tidal; coastal plain lowlands tidal; coastal plain uplands tidal; coastal plain lowlands non tidal; coastal plains uplands non-tidal Appalachian plateau siliciclastic non-tidal; Blue Ridge non-tidal; Mesozoic lowlands non-tidal; valley and ridge carbonate non tidal; Piedmont crystalline tidal; Piedmont crystalline non-tidal; Piedmont carbonate non-tidal; valley and ridge siliciclastic non-tidal Cover crop early drilled rye Coastal plain/Piedmont crystalline/karst (low-till gets only TN efficiency) settings*
From page 195...
... 195 APPENDIX B TN TP SED Reduction Reduction Reduction Efficiency Efficiency Efficiency 38% 42% 56% 24% 30% 40% 46% 42% 56% 13% 45% 60% 39% 39% 52% 39% 42% 56% 21% 45% 60% 32% 36% 48% 32% 39% 52% 7% 12% 4% 25% 50% 15% 14% 26% 8% 10% 20% 70% 15% 40% 70% 45% 15% 20% 34% 15% 20% Continued
From page 196...
... * Cover crop standard drilled rye Coastal plain/Piedmont crystalline/karst (low-till gets only TN efficiency)
From page 197...
... 197 APPENDIX B TN TP SED Reduction Reduction Reduction Efficiency Efficiency Efficiency 38% 15% 20% 29% 15% 20% 31% 15% 20% 24% 15% 20% 18% 15% 20% 14% 15% 20% 41% 7% 10% 31% 7% 10% 35% 7% 10% 27% 7% 10% 19% N/A N/A 15% N/A N/A 16% N/A N/A 12% N/A N/A 31% 15% 20% 24% 15% 20% 27% 15% 20% 20% 15% 20% Continued
From page 198...
... * Cover crop standard drilled wheat Coastal plain/Piedmont crystalline/karst (low-till gets only TN efficiency)
From page 199...
... 199 APPENDIX B TN TP SED Reduction Reduction Reduction Efficiency Efficiency Efficiency 22% 15% 20% 17% 15% 20% 12% 15% 20% 10% 15% 20% 29% 7% 10% 22% 7% 10% 24% 7% 10% 18% 7% 10% 13% N/A N/A 10% N/A N/A 11% N/A N/A 9% N/A N/A 38% 20% 20% 29% 20% 20% 32% 15% 20% 25% 15% 20% 27% 15% 20% 20% 15% 20% Continued
From page 200...
... * Cover crop standard drilled barley Coastal plain/Piedmont crystalline/karst (low-till gets only TN efficiency)
From page 201...
... 201 APPENDIX B TN TP SED Reduction Reduction Reduction Efficiency Efficiency Efficiency 15% 15% 20% 12% 15% 20% 29% 7% 10% 22% 7% 10% 24% 7% 10% 19% 7% 10% 17% N/A N/A 15% N/A N/A 12% N/A N/A 7% N/A N/A 15% N/A N/A 12% N/A N/A 7% N/A N/A 6% N/A N/A 15% N/A N/A 11% N/A N/A 12% N/A N/A 7% N/A N/A Continued
From page 202...
... * Commodity cover crop Coastal plain/Piedmont crystalline/karst early aerial corn barley settings*
From page 203...
... * Appalachian Plateau siliciclastic non-tidal; Mesozoic lowlands non-tidal; Piedmont crystalline tidal; Piedmont crystalline non-tidal; valley and ridge siliciclastic non-tidal; Blue Ridge non-tidal.


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