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<br />". <br /> <br />13 <br /> <br />. <br /> <br />2,2.S:. <br /> <br />SILT DEPOSIT DATA. <br />The Colorado River ,md most of its ttibutarios l1ave <br /> <br />. <br /> <br />b33n for ~~ centuri~sJ and still ~~eJ eroding their beds <br /> <br />and banks a.;~d carrying large q.ua..'1ti ties of sedim:mt, a part <br />of which are (lOIlosi ted on the alluvial valleys during periods <br />of overflow, and part reaches the Gulf of California v~1ere it <br />is conti~ually oxter~ing and enlarGing its delta. <br />Q"oservatione of silt carriad haNe boen tr~en p<Jriod- <br /> <br /> <br />ically at Yuma j1.1St b31o',1 the UlQuth of the Gila River for a <br /> <br /> <br />long series of years and ,;ho'il a."1 aV<Jrage ==1 ,,!oount by <br /> <br /> <br />-;olU!lla of 113, 000 acre-f,,~t, on t:,lO assumption that 85 pounds <br />of dry matter is eqttival~nt to a cubic foot of solid. Most <br />of th3 tim". the Gila JivJr is n~arly dry a."ld the little <br />watar it discharges is 010&. Tne observdion" at YUIl'.a <br />th'orafore indica.te th.J silt travelin3 at that ti:m in tho <br />Colorado above the Gila., t.nd by difference at otner tUn"", <br />tho quantity discharged by the Gila during ita relatively <br />short high water poriods.' Observations on the Gila have <br /> <br />also b~3n talwn at tho Buttes abov~ Florence and at San <br /> <br />Carlos. A fe':: observationu ;1B.VO also been ta.k..m on the <br /> <br />San Juan, the Grsen ann the Grand, but these arc too few <br /> <br />to be conclusiv~ a.;,d any statement concerning thase streams <br /> <br />wust b" considered as ~ very rough estimate. Tho following <br /> <br />ta.bl~ shows the estimates on which this report is basod. <br /> <br />. <br />