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• <br />• Ir <br />r{:~~ <br />S <br />~ + 1~~7 a <br />~Z~F ~, <br />THE STATE r-!.~ I~~A', ` <br />~? r...•. ._I, ~ OF WYOMING <br />.rt J` 4-~+~ <br />ED HERSCHLER <br />G0~'ERAOR <br />~e~ia2zfine~2~ a~ ~~22~i2a~2me72~a~ ~cca~i~~ <br />1.:~~u(Il::~l.rn ~nlslo~ <br />401 WEST 19TH STREET TELEPHONE 307.777-7756 CHEYENNE, WYOMING 92002 <br />I. Objectives <br />The objectives of landscape slope analyses are to: <br />(1) Establish pre-mining slopes and slope distribution as a basis for <br />designing post-mining slopes (topography). <br />(2) Compile a geomorphic data base to be used in pre- and post-mining land <br />form comparison. <br />(3) Obtain qualitative and semi-quantitative estimates of erosion and <br />surface runoff from the post-mining land surface. <br />II. Afethods <br />• The following analyses and map development should be conducted for the pre- <br />mining and post-mining surfaces. Comparisons can then be made. Good quality <br />1" = 500' topographic maps with 5' contour intervals are recommended. <br />A. Ilypsometric Analysis <br />Hypsometric analysis (Straliler, 1952, 1964) should be conducted on <br />a variety of drainage basins within the affected area (and general <br />area for coal mines). All drainage basins in which mining or stock <br />piling will be conducted should be included. The distribution of <br />drainage areas should extend from first order drainages on T~ minute <br />U.S.G.S, quadrangle maps to the largest stream draining the affected <br />area. Site specific conditions can result in variations from this <br />recommendation. The analysis is conducted as follocas: <br />1. The drainage basin is characterized in three dimensions as <br />the land surface bounded by vertical sides, and a horizontal <br />base plane which passes through a downstream reference point <br />(usually a stream confluence). <br /> <br />