OCR Text |
Show Ferry . It merely shows 85 that the more volume the higher the water rises . And it is the relation from which the discharge is computed . The ( approxi approxi- approxi ) , mate flow can be determined from this ( curve curvO ) . Prom that also the velocities and depths . The second curve represents the approximate ( re- re ) lation between the stage and the ( cross-sectional crosssectional ) area , as shown on the first plate , that is , the number of square feet in the cross section of the river . The scour and fill of the stream is indicated also on the curve . For ( instance histance ) between measurements 152 , and 162 , both are made at approximately the same gage height of 17.8 . The area ( in iu ) cross section of the water when measurement No . 152 ( was -was was ) taken was 8,000 square feet . The area of the water when measurement No . 162 was taken at the same gage height , the same stage of ( water-the waterthe ) ( cross-sectional crosssectional ) area was 10,000 feet . In other words , between those two measurements , 2,000 square feet of the bottom of the river on that cross section had been scoured out by the water . Now , the scouring out of the cross section changes all the velocity . The third class is an indication , or approximate indication , of the relation between stage and ( veloc- veloc ) ity of the river . Given the same volume of ( water -water water ) you would get the same velocity . What this shows is , say you have a certain stage of ( water -water water ) , say , at this particular place , of 18 feet : |