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1 <br />~ 1 <br />1 <br />1 <br />1 <br /> <br />The following drainage report for the Trinidad Basin Mining, <br />Inc. loadout facility in Trinidad, Colorado includes runoff cal- <br />culations, sizing of collection and diversion ditches, sizing of <br />sedimentation ponds and calculation of release flows to give the <br />regulatory 24-hour detention time for sediment contaminated waters. <br />Considering the size of the drainage basin, a full reservoir <br />routing technique was not used. Instead, use was made of an ap- <br />proximate triangular hydrograph procedure as explained in "Hydrology <br />and Sedimentology of Surface Mined Lands" by C.T. Haan and B.J. <br />Barfield. <br />