OCR Text |
Show ( represent xeprespilit ) a ( picture piettire ) of the ( 81 84 ) ( condition conditioii ) . The ( informa inforilla- inforilla ) ¬ tion ( on oil ) Plate ( 3-A 3A ) contains the date of the estimate , the engineer who made it , the width ( , ) ) the area , the mean velocity , the gage height , the discharge , and the official number of the ( measurement-all measurementall ) of which are published by the Geological Survey . Plates 1 , , 21 37 4 , and 5 show the characteristics of the river , as shown at these gaging station . Plate 5 is based ( on oil ) measurements made at Lees Ferry , ( 1921 -1921 ) and 1922 ; ( some sonic ) thirteen measurements being used for 1921 and some 89 measurements being used for 1922 . The first curve on the plate shows the approximate relation between the stage of the gage height and the flow of the river ; these are based ( on oil ) the ( measurements measi-i-remeilts measiiremeilts ) made covering the entire range in stage . This relation is ( approxi approxi- approxi ) ¬ mate only , as are all of the relations shown on these plates , because of the fact that the rivers are subject to scour and fill , and ( 110 no ) one curve can accurately depict the true relation between those amounts . The first curve shows that the discharge varied from about 5,000 ( second-feet secondfeet ) , or less , for a ( gaga gage ) height of about 7 feet , to approximately , 115,000 ( second-feet secondfeet ) for a gage height of 20 feet ; in other words , with a ( 13-foot 13foot ) rise in stage at Lees Ferry , the discharge ( increases hicreases ) from 5,000 to 115,000 . This curve shows the rate of change and gives the approx . ( ¬ - ) imate discharge for any stage . These curves are the basis of the fall of the stream flow records which are published by the Geological Survey for Lees |