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2.7.4.3 Geomorphology (permit area) <br />Geologic, biologic and hydrologic parameters working together form the drainage <br />system characteristics. Topography, stratigraphy and structural geology have <br />been discussed (Sec. 2.7.1). Vegetation is discussed in Section 2.3. The ephe- <br />meral nature of the drainages (Sec. 2.7.4.1) and climatic regime (Sec. 2.1) are <br />also discussed. A qualitative description of the processes that have formed the <br />drainage systems in the permit will be discussed. <br />Drainages at the Trapper Mine are eroded in strata of the Williams Fork formation <br />on the dip slope of the Big Bottom Syncline. The slope of the land surface and <br />dip of the beds is nearly equal. Thus, streams on the north side of the Williams <br />Fork Mountains usually erode in the same type of material as they flow down- <br />stream. Morphology of the stream systems therefore appear dendritic in pattern. <br />Drainage densities for each tributary system have been determined from standard <br />U. S.G.S. quadrangle maps and are presented in Table 2.7-19. For the drainages in <br />the western portion of the permit area, Longitudinal profiles Fur the longest <br />channel in Buzzard, Coyote, Johnson and No Name Gulches were plotted on Map M14 <br />and show a typical decrease in gradient in the downstream direction. In some <br />locations, however, the gradient does steepen. This would point to <br />M 2-452 <br />(~~8~ F~813 '87 <br />