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<br />A, 0,0025 B. <br />w ., :c <br />" 0 <br /><< Z <br />" ~~ << <br /> a: <br />"- 0.0020 ~ <br />"- ~ <br />wf" ww <br /> . 0.0 <br /><l.", \ <br />9a: g~ <br />",w . "'w <br />w~ 0,0015 wz <br />00 ~g <br /><<~ <br />"-0 "-0 <br />a:f- !Sf- <br />:Ow $ ",w <br /><Q" ," <br />a:<< 0.0010 1941 FLOOD a:<< <br />w" w" <br />1<>- / I< <br />~a: ~f;: <br />a: a: <br />w w <br />"- . "- <br />'" 0.0005 '" <br />w w <br />"j "j <br /> <br />0.0015 <br /> <br />0.0010 <br /> <br />. <br />. <br /> <br />0.0005 <br /> <br /># <br />~. <br />. <br /> <br />.. <br />. <br />~ <br />. <br /> <br />. <br /> <br />1921 FLOOD <br />\ <br />. <br /> <br />0.0000 <br /> <br />.\ <br />.# . <br />t <br />. .. <br /> <br />0.0000 <br />5 <br /> <br />10 15 20 25 <br />STAGE AT LEES FERRY GAGE, IN FEET <br />C. 0.0025 <br /> <br />30 <br /> <br />-0.0005 <br />5 <br /> <br />10 15 20 25 <br />STAGE AT LEES FERRY GAGE, IN FEET <br /> <br />30 <br /> <br /> . NOVEMBER 1 THROUGH FLOOD PEAK <br />w 0 FLOOD PEAK THROUGH OCTOBER 31 <br />" <br /><< <br />" 0.0020 <br />>- I~ ~ 1921 FLOOD <br />wa: <br /><l.a: <br />Ow <br />~"- <br />"'", 0.0015 <br />ww <br />ow /;...10 'I <br /><<~ <br />"-0 <br />a:f- <br />:Ow <br /><Q" 0.0010 <br />a:<< <br />~" ...; . <br /><<~ <br />~a: ~.\+.. <br />w · i : 0 <br />OJ <br />" 0.0005 <br />:0 ~v <br />Z <br /> 0.0000 <br /> 5 10 15 20 25 30 <br /> <br /> <br />Figur. 6. Water.surtace slopes as a function of stage: (AI In the 1 ,5-mile.long reach between the Lees ferry Gage and the Lower Staff Gage, <br />determined from 27 stage measurements made a1the 2 gages during 1941 and 1942, and 11 stage measurements made a1the 2 gages during 1958 <br />and 1959.161ln the OJ.mile.long reach between the Lees ferry Gage and the lower reach ofthe Paria River a1the Lonely Dell Ranch, determined from <br />the June 7,1922, surveys of the June 1921 high-water marks, and from 30 surveys made during higher.water periods in 1927, 1928, and 1929. Because <br />the lees Ferry Gage and the Lonely Dell Ranch are on opposite banks of the river above the gravel bar, there is a cross-stream component of the water- <br />surface slope in this figure that would be absent if these sites were on the same side of the river. This leads to the water-surface slope between the <br />gage and the ranch becoming negative at stages above 17 feet (at discharges above 90,000 cubic feet per second), At extremely high stages, as during <br />the 1921 flood, the water.surtace slope is of the order of 0,00001, as fully backwatered flow conditions develop in this reach, ([) In the B20.foot.long <br />reach between the Number 1 Gage and the Lees ferry Gage, determined from 136 stage measurements made at the two gages between June 18, <br />1921, through September 15, 1922, Similar to the case in part 8, because the Number 1 Gage and the Lees ferry Gage are located on opposite banks of <br />the river in a meander, there is a cross-stream component of the water-surface slope in this figure. Data in this figure and in parts O-E are segregated <br />into: (11 slopes measured each year between November 1 and the peak ofthe subsequent snowmelt flood, and (2) slopes measured each year between <br />the peak of the snowmelt flood'and October 31, Because of the seasonal scour and fill of sediment in the pools upstream from the Lees ferry Gage, <br />hysteresis during the annual snovJn1elt flood (indicated by arrowsl exists in the water-surtace slope in this figure and in parts D-E <br /> <br />16 Computation and Analysis of tho InstantanoousMDischargo Rocord for tho Colorado Rivor at lees Ferry, Arizona-May 8. 1921. through September 30. 2000 <br />