OCR Text |
Show It is a ( well-known wellknown well-luiown wellluiown ) scientific 90 fact that flowing , water is capable of moving sediment ranging in size from the finest ( debris de"bris debris ) to large boulders . The method of movement ( varies vaTies ) ; fine material is ( car- car ) ried in suspension ; ( medium-sized mediumsized ) material slides or makes short skips , the larger rocks and boulders roll . ( Howard and Love , Vol . 21 . ) On the ( Colo- Colo ) ( rado Tado ) and San Juan Rivers the movement of ( sedi- sedi ) ment may take place inthe form of waves . The character and amount of material ( which vhich ) will move depend primarily upon the velocity , the size , and amount of the sediment , and , to a limited extent , upon the shape of the channel . ( Howard , Vol . 21 , page 3810 . ) It is clearly evident that the Green , Colorado , and San Juan Rivers cannot have stable or ( perma- perma ) nent channels since their beds are composed ( of' of ) sand2 silt , and sediment of varying degrees of ( fine- fine ) ness and channel velocities range from ( 1 I ) or 2 miles an hour to over 10 miles an hour . Scientific ( deduc- deduc ) tion leads to this conclusion . The conclusion is supported by actual observations , technical and otherwise as follows : , Green River ( G-reen Green Green ) ( River Biver ) Utah , to ( mouth inoutk ) of San ( Kafael Rafael ) . - The unstability of the bed at the Green River gaging station is shown on Plate IV , Exhibit 76 . . |