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Lorencity CanYVn Mine -Surface Water Technical Rryort <br />• stream. These measurements were converted via stream discharge curves that were generated via <br />the Manning's equation. Copies of the determination of the discharge curves are included in <br />Appendix SW-1. Analyses of flow data was performed from hydrographs generated from the <br />flows. Five hydrographs were generated, four from the Lorencito Canyon stations, and one from <br />the downstream Cow Canyon station. Copies of these hydrographs are included in Appendix SW- <br />2. Analyses of the hydrographs from the Lorencito Stations indicate a similarity of flow. During <br />the months of January through July, flows are low or non-existent at some stations. During the <br />higher precipitation months of July, August, and September, flows are higher. Precipitation data <br />is presented in Section 2.04.8 of the Permit Document. Flows at these stations ranged from 0 cfs <br />to 5.5 cfs (non-storm related). Station LC-4 had flows that were atypical of the other three <br />stations. Flows at this station were higher in the spring than in the late surttmer/early fall. Flows <br />at the CWC stations were extremely low with the station exhibiting no flow conditions over <br />several months. Flows are summarized on Table SW-5. <br />u <br />• <br />TABLE SW-5 <br />LORENCITO CANYON MINE <br />SURFACE STATION BASELINE FLOW DATA (cfs) <br />Monitoring Site 'n', number of <br />sam lin events Minimttm Maximum Mean <br />Lorencito Canyon <br />LC-1 10 l.8 4.1 2.84 <br />LC-2 10 0 2.8 0.95 <br />LC-3 10 0 5.5 0.815 <br />LC-4 10 0 4.8 2.287 <br />Cow Canyon <br />CWC-1 10 0 2 0.23 <br />CWC-2 10 0 0 0 <br />Jeff Canyon <br />JC-1 10 0 0 0.1 <br />Puertecito Canyon <br />PC-l 10 0 I 0.1 <br />Bonita Canyon <br />BC-1 10 0 2 0.2 <br />Chimney Canyon <br />CC-1 l0 0 0 0 <br />Alamosa Canyon <br />AC-1 10 0 0.15 0.015 <br />sw.3761December 9, 1996 l4 <br />