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COAL <br />S�� COMPANY .� <br />EOPyE•pRODUCTiO�• <br />It is recognized there is some judgement involved in building the model. But in <br />this case it would be unlikely than much of Subwatershed's runoff would report to <br />Str. 30 ( channel from Pond PD] to Pond PD2) because it would have to flow <br />parallel to the contours to get th the channel, which violates the physics). In fact, <br />some small portion of the runoff form Sub - watershed L probably does find its way <br />into Reach 21 but the model is constrained by the physics, which are controlled by <br />the contours. <br />3. For the North Tributary of East Pit Ditch, please explain why drainalze areas <br />are modeled as "structures." <br />Colowyo's Response: <br />On complex drainages or drainages that vary in size over several modeled time <br />frames, we have elected to show the actual SEDCAD structures on the watershed <br />maps to make it easier to follow the model. The sub - watersheds themselves are <br />not actually modeled as "structures ". Rather, the collection points (eg., nodes, <br />channels, channel junctions, stock ponds, etc) are modeled as "structures". In <br />some cases, a "structure " may have only a single subwatershed tributrary to it <br />(eg. Subwatershed W into Structure I in the NTEP ditch, or Subwatershed El as <br />the only subwatershed directly tributary to Structure 9). In such cases it may <br />seem that the watershed is modeled as a structure, but the opposite is actually <br />true. The structure is fed by that single sub - watershed. <br />If you should have any additional questions or concerns please feel free to contact <br />me at your convenience at (970) 824 -1232. <br />Sincerely, <br />Tony Tennyson <br />Senior Engineer - Environmental <br />Cc: file CF 1.1.2.86 <br />A Western Fuels- Colorado, LLC mining property <br />