OCR Text |
Show The table also indicates 79 that during the year there are 77 days when the flow is below 2,000 ( second-feet secondfeet second-fect secondfect ) . In other words , based oil the pastrCC7 ords , there are 77 days in the year when you would expect a flow less than the day upon which he made his trip , and seven of ( them thein ) have more ( on oil ) the ( aver- aver ) age during September . Gaging stations are selected and operated by the Geological Survey at sections where the bed is as stable as possible , and in sections where the river is straight , where the velocities are distributed ( uni- uni ) formly throughout the ( cross-section crosssection ) . The bed should be stable in order to minimize the work that * has to be done ; the channel should be straight , in order that the velocities may be evenly distributed throughout the ( cross-section crosssection ) . All of the gaging stations that are maintained by the Survey on the Colorado River , the San Juan and Green Rivers , are located with these points in view . Plate ( 2-A 2A ) , Compl . Exh . ( 82-A1 82A1 ) is a ( cross-section crosssection ) of the channel at the measuring cable at Lees Ferry , showing range of change and the characteristic ( changes clianges ) in the channel itself caused by scour and fill . These curves are plotted ( cross-sections crosssections ) from actual field measurements made during the course of determining the flow of the water during a ( period-' period ) from November 22 , 19247 to July Ily 1926 . ( R . 4122-4124 ) To explain the Plate . The first measurement of the series shown oil this plate was made ( Novem- Novem ) |