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(Conceptual Analysis:) <br />• Physical History of the Platte River (Simons <br />and Associates, 2000) <br />— examined factors affecting the river <br />— described the changes in each factor <br />— described the theories proposed to account for <br />the changes <br />— discuss strengths and weakness of each. <br />Changes in the River (Simons and Assoc., 2000) <br />Factor Pre- Develop. Current <br />Annual flow 2.8 maf 1.4 maf <br />Peak flow 16,000 cfs 8,600 cfs <br />No flow Numerous Infrequent <br />periods <br />Median grain 0.41 mm 0.86 nun <br />size <br />