|
|
||
 Table 1.1.6. Background Runoff Concentrations For Total Nitrogen From Rural Land Uses.
Total Nitrogen Concentration
Source
Reference
(mg/l)
Native prairieMinnesota
5
Timmons and Holt (1977)
Native prairie-Oklahoma
9
Crow et al. (1979)
Continuous corn-Minnesota
91
Young and Holt (1977)
Rotation corn-Minnesota
44
Young and Holt (1977)
Continuous corn-Minnesota
131
Burwell et al. (1975)
Wheat-Oklahoma
2
Olness et al. (1975)
Oats-Minnesota
49
Burwell et al. (1975)
Rotation pasture-Oklahoma
2
Olness et al. (1975)
Continuous pasture-Oklahoma
3
Olness et al. (1975)
Alfalfa-Oklahoma
4
Olness et al. (1975)
Alfalfa-Minnesota
60
Burwell et al. (1975)
Fallow-Minnesota
186
Burwell et al. (1975)
Aspen-birch forest-Minnesota
0
Timmons and Holt (1977)
(after Young et al., 1987)
Reduction in animal waste pollutant concentrations in runoff moving as overland flow through a
vegetative buffer is calculated below from regression models determined from field measurement studies
(Young et al., 1982).
Dc1
= -27.9 + 42.8 log Tc
(1.1.28)
Dp1 = -49.3 + 50.5 log Tc
(1.1.29)
DN1 = -16.8 + 42.3 log Tc
(1.1.30)
Where:
Dc1 = percent reduction in COD concentration
(if < 0, Dc1 = 0)
Dp1 = percent reduction in TP concentration
(if < 0, Dp1 = 0)
1.1-26
|
||
|
||
