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• Introduction <br />For each sedimentation structure, diversion, culvert, and haul road ditch, the <br />relationship between rei of ell and runoff was determined through a hydrologic analysis of <br />the tributary drainage area. The following design methodology was used in the design of <br />these structures. <br />DESIGN NET HODOLOGY <br />General Xvdroloov Design <br />She precipitation runoff (peak flow end volume) was estimated using the Soil Conservation <br />Service (SCS) triangular hydrogreph techniques as described in Design of Smell Dams (U.S. <br />Dept. of ]nterior, 5977). Computations necessary for this runoff estimating technique <br />have been computerized by various individuals end agencies. <br />SEDIMOT II was developed by Research Specialist Bruce N. Wilson, Professor Billy J. <br />• Barfield, and Assistant Professor len D. Moore et the Department of Agricultural <br />Engineering, University of Kentucky, Lexington, Kentucky. SE DCAD is an enhanced PC <br />version of the SEDIMOT II computer program. This program was used to estimate runoff peak <br />flow and volume which are necessary in the design of the ponds, culverts, end ditches. A <br />copy of the computer progrem~s input and output file information has been included in <br />Addendum 5. <br />The input consists of precipitation amount (inches), watershed area (acres), time of <br />concentrecion (hours), end runoff curve number (cN ), and other pertinent watershed end <br />structure-related data. <br />i Preci Di cation and Storm Tvoe. The precipitation amounts at the Seneca II-W Mine area for <br />the design storm durations were obtained from the NOAH Preci pi cation Frequency Atlas <br />Precipitation - Frequency Atlas of the Yestern States - Volume 2, Colorado, 5973 and are <br />listed below. <br />• <br />73-5-5 Revised 03/01/95 <br />