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<br />19 <br /> <br />B. Field Investigations <br /> <br />W <br />""-1 <br />l\.) <br />~ <br /> <br />(1) Spatial variation of soluble mineral content (herein <br /> <br />denoted SMC) and of soluble minerals in the region <br /> <br />(Appendix A .1) . <br /> <br />(2) Movement of water, sediment and solutes on hillslopes, <br /> <br />Rill-flow as well as overland flow with raindrop <br /> <br />splash were studied (Chapter 3). The prominent <br /> <br />effect of rilling on solute yield has prompted the <br /> <br />development of a computer simulation of rill pattern <br /> <br />development (Appendix A.S), <br /> <br />(3) Mass transfer of sediment and solutes in a medium- <br /> <br />sized drainage basin (Chapter 4), at a confluence <br /> <br />(Appendix A.6) and in several large tributaries <br /> <br />(Appendix A,7) . <br /> <br />C. Determination of solute contribution and hazard areas <br /> <br />Based on results obtained from both field and laboratory <br /> <br />analyses, estimates of solute contribution from diffuse <br /> <br />sources and of general hazard regions in the Upper Colorado <br /> <br />River Basin are given in Chapters Sand 6, respectively, <br /> <br />." ;'< <br />