2012-07-10_PERMIT FILE - C1981041 (5)

Home Browse Search

LS (length and percent slope) factors account for the length and percent slope. These factors are taken from Figure 4. Length of slope begins at the top of the micro watershed. This is usually at the top of a hill, ridge, terrace or diversion. The length of slope is considered to end for a given field at one of the following places: (1) the point where the slope decreases to the extent that deposition occurs, (2) the point where runoff enters a well- defined channel, gully, terrace or diversion , or (3) where water leaves the field. Greasewood Reference Area - LS Factor The LS factor for the Greasewood Reference Area is based on an average 10.61-11V Slope and an average vertical height of 10.1 feet and average length of slope is 107 feet based on eight flow lines located in the reference area. The length of slope of run -off from the reference area was increased to a length of 496.8 feet to make it comparable to the North Portal (Greasewood) Area. Average Length 496.8 Feet Average Slope 9.4% Percent Slope (S) 8.0% 9.4% 10.0% 400 2.000 2.560 2.800 496.8 1 "LS" Factor 2.754 500 2.200 2.760 3.000 North Portal (Greasewood) - LS Factor The LS factor for the North Portal (Greasewood) Area is based on an average 20.71-1:11V slope at an average vertical height of 24.0 feet and an average length of slope of 496.7 feet based on four sections cut across the reclaimed landscape. Average Length 496.8 Feet Average Slope 4.8% Percent Slope (S) 4.0% 4.8% 5.0% 400 0.700 0.940 1.000 496.8 1 "LS" Factor 1.106 500 0.760 1.112 1.200 Shadscale Reference Area - LS Factor The LS factor for the Shadscale Reference area is based on an average 2.1 HA V Slope and an average vertical height of 166 feet and average length of slope is 347 feet based on five flow lines located in the reference area. The length of slope of run -off from the reference area was reduced to a length of 172.2 feet to make it comparable to the North Portal ( Shadscale) Area. Average Length 172.2 Feet Average Slope 47.6% Percent Slope (S) 40.0% 47.6% 50.0% 160 16.000 21.333 23.000 172.2 "LS" Factor 21.943 180 17.000 22.333 24.000 North Portal ( Shadscale) - LS Factor The LS factor for the North Portal ( Shadscale) Area is based on an average 112.31-11V slope at an average vertical height of 14 feet and an average length of slope of 172.2 feet based on five flow lines cut across the reclaimed landscape. Average Length 172.2 Feet Average Slope 8.1% Percent Slope (S) 8.0% 8.1% 10.0% 160 1.200 1.230 1.800 172.2 "LS "Factor 1.346 180 1.400 1.420 1.800 PR-5 A14 -13-12 02112