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<br />OJ,12Jl <br /> <br />30 <br /> <br />The rise in stage at the Colorado Canal due to a reservoir release is <br />gradual. In order not to put a hole in the river, the diverting headgate <br />should be opened gradually. An analysis of 10 large releases to the Colo- <br />rado Canal during 1967-70 showed the following arrival rates: <br /> <br />2~h of the total flow rate arrived 1.1 hours after the first effect <br />of the release was felt <br />5~h arrived in 2.2 hours <br />7~!o arrived In 3.3 hours <br />10~!o arrived In 4.4 hours <br /> <br />This Indicates an ideal opening would be a continuous opening of the <br />gate at a constant rate for 4.4 hours. This may not be practical and a step <br />increase in gate opening may be necessary. <br /> <br />The tall off of the release at the Colorado Canal was also studied. <br />Data for the tall off also indicated a constantly failing rate from time of <br />first effect of shutoff. The ideal situation would be to continuously close <br />the gate for about 20 hours In order to divert the release hydrograph. <br />Again, this may be impractical and a step procedure used. <br />