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2.04.7 Hydrology Description <br />Diversions for agricultural uses are withdrawn through the Terror Ditch from <br />Terror Creek from May through October. <br />In 2003, the USGS in cooperation with Delta County initiated a study to <br />characterize stream flow gain loss in a reach of Terror Creek where the <br />applicant is constructing the 1 West Main entries to access the western <br />reserves. Tracers were used to evaluate the stream flow gain loss. A <br />comparison of the measurements above and below the mine permit area <br />showed a consistent loss of about 0.33 cubic feet per second. The gain loss <br />report is available on the WEB by searching for "Scientific Investigations <br />Report 2005 - 5018 ". <br />Longwall mining in the west panels located east of Terror Creek did not <br />commence until after 2003. Since the gain loss report was prepared based <br />on 2003 flow data, the gain loss measurements were not impacted by the <br />Operator's mining. The purpose of the gain loss study was to develop <br />baseline flow data and to satisfy Federal coal lease COC -61209 stipulation <br />number 23. <br />The BLM has two federal appropriated instream flow rights on 2.5 miles of <br />Terror Creek and 1.25 miles of Hubbard Creek. See the following table. <br />Water Right Summary <br />Water Right <br />Spring /Pond Designation <br />Decree <br />Date <br />Owner <br />Hubbard Creek 1.25 Miles <br />Instream <br />0.011 CFS <br />12/31/1882 <br />BLM <br />Terror Creek 2.5 Miles <br />Instream <br />0.012 CFS <br />12/31/1882 <br />BLM <br />Available hydrologic informational data from the USGS, Bowie and others <br />was investigated to identify typical and dry-year flows in West Fork Terror <br />Creek in the Spruce Stomp Lease Area. Stream flows in West Fork Terror <br />Creek are highly variable depending on season and year. In addition to being <br />influenced by climatic influences, West Fork Terror Creek flows are <br />manipulated by transbasin diversions, and tributary wells that collect water <br />and transport it out of the watershed. Based on direct measurements made <br />by Bowie, average daily mean flows are highest in March (19.9 cubic feet per <br />second [cfs]) and are lowest during late summer and early fall (approximately <br />1 cfs in July, August and September). Based on an analysis of diversion <br />records and USGS flow measurements, dry-year conditions can result in flow <br />reductions in West Fork Terror Creek of 70 percent or more compared to <br />PR -14 2.04-53- 03/14 <br />