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Section 780.18 (b) Continued. <br /> <br />feet per acre. The detention capacity of the combined chisel <br />plowing and contour furrowing amounts to 5,121 cubic feet per acre <br />or 78 percent (1.41 inches) of the projected 10-year, 24-hour storm <br />event of 1.8 inches (6534 cubic feet) calculated under Section <br />816.42. Thus, the amount of the 10-year 24-hour storm event cap- <br />able of becoming surface runoff is 0.39 inches. The balance of <br />0.39 inches of rainfall left over from detention will be readily <br />absorbed into these soils because they have an excess infiltration <br />capacity of over 0.3 inch. These data indicate that the possi- <br />bility of overland flow from a rainfall event will be very small <br />immediately after the area is topsoiled and contour furrowed. <br />All areas within the proposed Kerr Permit Area will be mulched with <br />a rapidly growing cereal grain species. <br />Consultation with grain specialists at Colorado State University <br />has determined which species of cereal grains would produce the <br />most plant biomass for mulch in the shortest possible time. The <br />species recommended for spring planting is Russel oats and for fall <br />planting is Elbon Winter rye. Both species have been planted with <br />considerable success at the Marr Mine for the past two years. <br />Application of surface blown straw mulch will be conducted on all <br />road slopes that cannot be effectively stabilized by drill or <br />broadcast seeding. Side slopes on topsoil stockpiles will also be <br />seeded and stabilized via this method if sufficient vegetation <br />cannot be established to control wind and water erosion. <br />These overburden and topsoil handling techniques, together with the <br />use of cereal grains, woody material and straw mulch described <br />earlier will provide more than adegate mulching and soil stabili- <br />zation. <br />780-82 <br />