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<br />Figure Captions <br /> <br />~;ure 1. Index map of the northern great plains province. Dashed lines <br />are mean dr~nual. precipitation isoliyets (from the P~ational Atl.:~s) . <br />Stipplv~g denotes general coal reserves while solid areas rek,re- <br />sent deposits accessible to surface miring (modified £rom National Aca- <br />demy of Sciences, 1974; and lvhite, I.L., et al., 1974). <br />Figure 2. Average monthly precipitation for four Powder River Basin stations <br />(Gillette-2I:, Rochelle-~E, Douglas, and Dull Center). Solid lire <br />is actual. pre-.cipitation based uper_ r!eteorological records. Dashed <br />line is hypothetical consurptive use assu^ung grassland evapotrans- <br />piration ~•:ere replaced by precipitation and irrigation to raintain <br />corstant soil moisture level. Ihtted line represents nstw•al pre- <br />cipitation theoretically available for plant use. It is modified <br />from station precipitation fik-ures tlu•ough alla~~arce for sublimation <br />of bloiain; sno~.~, thundershot1~er runoff, and interception loss. Diad- <br />ified from (Marwitz and Rodgers) 1974. <br />Fi~uio 3. Probabili.t;~, in percent, of receivi~ig trace or less or exceeding <br />indicated m;,owtts of precipitation for aone-t,•eek interval at <br />Gillette, liyon;ing (±rom Decker aid Al}•ea. 1964). <br />