| OCR Text |
Show 21 foot . The ( Avails walls ) in Glen ( Oanyon Canyon ) ' vary ( from froin ) tNvo or three hundred to sixteen hundred feet . ' ' ( ( Exr- Exr ) hibit 251 , Phot . No . 29 . ) Jones , topographer , with the second Powell expedition ( summary of Exhibit 628 ) , notes 31 rapids in Glen ( Oanyon Canyon ) , at one of which party waded and eased boats . Stanton , - ( with vith ) his railroad survey ( ( summary suliunary ) of ( Ex- Ex ) hibit 176 ) , notes 20 rapids , at one of which boats were lined and goods portaged . The average slope of the water through Glen Canyon as shown by ( Ex- Ex ) hibit 10 , ( plan plail ) and profile surveys , sheets 1-12 and 52-54 and Exhibit 80 , is practically 2 feet to the mile . The mean flow of Colorado ( River Ri-ver River ) at Lees Ferry , based on official records 1922 to 1928 ( Exhibit 88 , page 39 ) , is 19,500 ( second-feet secondfeet ) with a minimum daily of ( 1,000 '1,000 ) ( second-feet secondfeet ) and a maximum daily of 119,000 ( second-feet secondfeet ) . The average mean monthly flow August to May is between 5,680 ( second-feet secondfeet ) and 21,900 ( second-feet secondfeet ) , and during the months of May , June , and July , between 27,800 ( second-feet secondfeet ) and 62,400 ( second-feet secondfeet ) . During the latter ( three t1iree ) months 60.8 per cent of the total yearly ( run-off runoff ruii-off ruiioff ) occurs . From Lees ( Perry Ferry ) the Colorado River continues generally ( westward westwaTd ) through canyon section , the first 61' L miles being designated by Powell as Marble ( Canyon Callyon ) and the next 223 miles as ( Grand GTand ) Canyon . |
