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<br /> <br />14 <br /> <br />PHYSIOGRAPHIC A...1\;"D HYDRAULIC STUDIES OF RIVERS <br /> <br />stream areas. The flatter slopes and greater lengths <br />of overland flow in the lower parts of drainage basins <br />seem to militate against a downstream increase in <br />sediment concentration contributed to the ehannel <br />system from the watershed. <br /> <br />Our measurements in ephemeral streams ,vere con- <br />fined to relatively small drainage basins, all of which <br />were characterized by fairly uniform lithology. It <br />appears necessary then, to assume that the observed <br />increase in concentration results either from a gradual <br /> <br /> 100 <br />>- <br />w <br />w <br />~ <br />'" <br />;r;- <br />>- <br />c <br />j< <br /> !O <br /> <br />t;:, <br />w .5 <br />~ <br />'" <br />I <br />>- <br />"- <br />w <br />c <br /> !O <br /> .05 <br /> <br />c <br />z <br />o <br />'-' <br />w <br />'" <br />'" <br />w <br />"- <br />>- <br />w <br />w <br />~ <br /> <br />'" <br /> <br />~ <br />U .5 <br />o <br />~ <br />~ .3 <br /> <br />1000 <br /> <br /> <br /> <br />5 <br /> <br />I <br />. <br /> <br />. <br /> <br /> <br /> <br />LO <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />o <br /> <br />o' :...-no <br />........ . . <br />o 0 <br /> <br />. <br /> <br />5 <br /> <br /> <br />. <br /> <br /> <br />.I <br /> <br />!O <br /> <br />10,000 <br /> <br />1000 <br /> <br />100 <br /> <br />FtQURE ll.-Changein width, depth, and velocity with dischl\.rge as discharge increases downstream WIth drainage area. Polnt~ plotted include aU individua!measure- <br />ments made on ephemeral channels in Kew :\.lexlco. <br /> <br />DISCHARGE. IN CUBIC FEET PER SECOND <br />