OCR Text |
Show 88 , Although to date the laws ( governing governhig ) the habits of ( silt-laden siltladen ) streams have not been well established , their ( characteristics cliaracteristics ) are fairly well ( known luiown ) . It has been established quite definitely that the higher the velocities in the ( stream streain ) the ( more niore ) sediment will be carried in the channel , and vice versa , and also that the amount of sediment transported lias a relation to the size and character of the ( sediment sediinent ) and the shape of the channel . As pointed out by Howard , Vol . 21 , page 3810 , there is ( no iio ) uniformity in the rate of movement of the sediment or in its ( dis- dis ) tribution in the cross section . As a result of these conditions there is a ( variation -variatioil variatioil ) in the amount ( car- car ) ried past any particular point ranging from a few ( th'ousaud thousaud ) tons per day to as much as 20,000,000 , tons a day . ( Love , ( Vol Yol ) . 21 , page 3826 . ) This is the natural result of the wide range in channel ( ve- ve ) locities shown to exist and ( which wkich ) result in a ( con- con ) tinual process of scour and ( fill M ) ; a building up of bars in one place and tearing down in another ; a sorting and redistributing of the millions of tons of sediment ; a movement at times in the form of sand waves of the entire bed of the stream . These conditions account for the ( instability uilstability ) of the beds of the Colorado Green and San Juan Rivers . , , Unstable channel Evidence shows that with respect to sand bars and gravel bars the rivers divide into fairly definite |