OCR Text |
Show ( cause catise ) a complete or partial 141 deposition of load result ing in the building up of long diagonal bars ( Photo No . . 16 , Compl . Exhibit 145 ) , paralleling ( approxi- approxi ) mately the thread of the velocity ( Dent , Abs . R . vol . 1 , , p . . 343 ) . The assumption that these crossing bars more especially those composed of the finer materials , ( are -ire ire ) continually changing their size , shape , and ( loca- loca ) tion is logical when it is considered that not only does the position of the thread of the current change ( appreciably appreciabl ) with each change in flow , but also during low stages when changes in flow are minor , the ( mate- mate ) rial cut from the lower side bars drifts along to be deposited in the wider cross sections at the crossing bars . Dent says : This bar ( crossing would ordinarily be built up during any freshet . It will occupy the same general position each year , but its form may be entirely different from year to year ; The bars which form along the inside of the bends , the general character of which has been shown by ( large-scale largescale ) surveys ( Compl . Exhibit 76 ) , fall in three general types . Firstj the bars that are partially awash during ( low-water lowwater ) periods ; second , ( ex- ex ) tensive sand bars having an average height of 4 to 6 feet above the water ; and third , the ( willow- willow willoiNr- willoiNr ) covered bars and benches ranging 12 to ( 15 1.5 ) feet in height . The bars that are practically awash at . the lower stages are the result of the lowering of the velocity in the cross section next to the inside of the bends |