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f • • <br />Page 2 <br />April 7, 1983 <br />Mr. David C. Shelton <br />raised to create reclamation flow conditions. The increase in "n" <br />will decrease the velocity of flow and increase the depth of flow <br />until an equilibrium of resistance and velocity is reached. Since <br />the channel depth and width is great, when compared to the quantity <br />of flow, it is not anticipated that any problems of erosion will <br />be encountered. <br />Of nearly equal importance as erosion control will be the ability <br />of the rip-rap to resist movement and provide continued erosion <br />control. The graph shown in Appendix 2 indicates that a 3.5 ft. <br />diameter stone will be more than adequate to resist movement. <br />The preceding analysis shows that reclamation of the creek channel <br />at the mine site can be accomplished to provide erosion protection <br />during a 100 year - 24 hour storm event. If there are any questions <br />please contact me. <br />Sincerely, <br />SALT CREEK MINING COMPANY <br />~~~~~~ <br />John M. Walters <br />Chief Project Engineer <br />JMW/jmp <br />Appendix (s) 2 <br />cc: William C. Bosworth. <br />Sheridan Enterprises, Inc. <br />