Laserfiche WebLink
r <br />j <br /> <br />approximately 3.37 tons of topsoil will be lost from the slope. The reason <br />for such a minimal loss is because the rainfall factor is adjusted from the <br />annual rainfall factor (EPA 1977). The period of time for the topsoil to be <br />bare will be from November to January at the longest. This happens to <br />coincide with the period of time when the erosive force of precipitation is <br />at a minimum (ie snowfall). <br />The remaining fill will be built within the next week and ready for <br />topsoil placement on the upper south outslope and the north outslope. The <br />erosion yield for these two slopes are presented in table 1. After the slopes <br />are seeded and mulched the amount of soil loss is reduced significantly. <br />Table i Predicted erosion from outfi]1 slopes <br />i~ <br />Location Area R K LS P C Soil Loss <br />(acreage) t/ac/year t/year <br />Lower South Outslope <br />Bare Topsoil 0.96 .78 .25 18 1.0 1.0 3.51 3.37 <br />Seeded & mulched 0.96 39 .25 18 .5 .021 1.84 1.17 <br />Upper South Outslope <br />Bare Topsoil 1.74 .78 .25 17 1.0 1.0 3.32 5.77 <br />Seeded & mulched 1.74 39 .25 17 .5 .021 1.74 3.03 <br />North Outslope <br />Bare Topsoil 0.60 .78 .25 17 1.0 1.0 3.32 1.99 <br />Seeded & mulched 0.60 39 .25 17 .5 .021 1.74 1.04 <br />LS= length and degree of slope factor <br />Bare Topsoil for two month period (Nov 1 - Jan 1) <br />• <br />