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<br />I. INTRODUCTION <br />1.1 General <br />The purpose of the determination of the hydrologic consequences is to en- <br />sure the mining and reclamation plan is developed to minimize hydrologic impacts. <br />The hydrologic impacts are minimized by maintaining the hydrologic balance of <br />both groundwater and surface water systems. Mining can affect the hydrologic <br />characteristics of both on-site and off-site systems including, but not limited <br />to, evapotranspiration, rate of infiltration, sedimentation and erosion, rate <br />of base flow, shape of the landscape, and capacity for surface water storage. <br />Through use of proper mining techniques and adequately designed hydraulic stru~- <br />tures, the impacts to the hydrologic balance can be minimized. <br />C <br />l.z 5co~e <br />f The following report is in sequence with two previous reports entitled <br />' 'General Description of Hydrology, G.E.C. Minerals, Inc., Florence, Colorado" <br />(General Description of Hydrology Report) and "Preliminary Data Base for <br />Application of NULTSED Program, G.E.C. Minerals, inc., Florence, Colorado" <br />(Preliminary Data ease Report). The two previous reports presented the infor- <br />mation background for the surface water and sedimentation analysis of the G.E.C. <br />Minerals surface coal mine at Florence, Colorado. The surface eater and sedi- <br />mentation analysis vas conducted using the MULTSED program developed by Simons, <br />Li i Associates, Inc. for surface mined areas. <br />A discussion of the MULTSED program was given in the Preliminary Data Base <br />Report. This report presents the surface water and sediment runoff results as <br />determined by MULTSED. The water runoff results are discussed and comoazed <br />with estimates calculated using regression equations developed from regional <br />relationships. The sediment runoff results are presented and discussed, however, <br />only limited information on the existing sediment runoff concentrations was <br />available for comparison. The MULTSED results are then used to check the ade- <br />quacy of existing and proposed hydraulic structures, and channel design alter- <br />natives are recommended to maintain the hydrologic balance during the progress <br />of mining. Design and stability measures are also recommended for restoration <br />• of disturbed drainage channels. <br />