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The change in shape of the stockpile results in minimum tum radii at the lower ditch run <br />has been increased from -50'to more than 70'. The attached Manning's flow <br />calculations show a ditch conveyance capacity well above the 11.9 CFS 0100 <br />estimation. Volume estimate of the structure will increase to about 805K CY. <br />c. Collecting ditch details are included in this mailing showing cross sections for the <br />grass lined lateral ditches, transitional zones from lateral to main ditch, as well as the <br />main collection ditch itself. In addition, Manning's Flow calculations are included using <br />0100 input potentials from the watershed outfall immediately north of the fines stockpile <br />that enters the pit at the base of the northern end of the fines stockpile. These potential <br />outfall discharge rates are several times as high as the maximum input off all of the <br />lateral ditches (155CFS vs. -30CFS) from the stockpile surface. Manning's flow <br />calculations again show capacity to contain the larger loading estimation. Eighteen - <br />inch rip -rap will adequately address the high energy potential of water moving down this <br />3:1 slope. <br />2) Broadcast Seeding. A copy of the approved seed mix is included in this <br />mailing. <br />Best Regards, <br />4 k4-a� <br />Randy DiLuzio <br />General Manager <br />Tezak Heavy Equipment Co., Inc. <br />205 Tunnel Drive <br />Canon City, CO. 81212 <br />Ph. (719)269-1173 <br />Fax (719)269-1148 <br />