Page 16


Page 16
Colorado River problem
Is Part Of,8
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THE COLORADO RIVER, PROBLEM 319 ft. per sec. It then remains practically constant until the discharge reaches 75,000 sec-ft. after which it slowly rises. (See Fig. 7.) After a velocity of 6.2 ft. per sec. is reached, the increase in area of channel, due to scour and rise of water level, keeps pace with the increase in discharge. (See Figs. 5 and 8.) A rapid increase in discharge produces higher water levels than a slow [Fig. 7 MEAN VELOCITY CURVE RIVER DATA AT THE YUMA GAUGING STATION, MAY 1, 1916] increase, because there is not time for the scour to take place. This may be seen by examination of the discharge and gauge-height curves. (See Fig. 9.) Between 20,000 and 40,000 sec-ft. appears to be a critical stage on a rising river. The silt carried within that range of discharge is excessive (see Fig. 10) and the channel on a rising river enlarges more by raising the water surface than by scour. Sudden changes in flow within that range will probably start more changes in channel than at discharges outside that range. [Fig. 8. TOTAL AREA CURVE - COLORADO RIVER AT YUMA, ARIZONA, May 1, 1916]

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