OCR Text |
Show Colorado River at Lees 119 Ferry ( 192-0-19,28 ( Second-foot Secondfoot Second-fleat Secondfleat ) ( Mcftn Xlean ) annual discharge 19,50.0 . . . . . . . . . . . . . . . . ( Minimum Miiiirnuin ) daily discharge 1 ( 000 GDO ) . . . . . . , . . . . . . . . . ? . , Maximum daily discharge 1191000 . . . . > . . Ratio , ( maximum inaxiinum ) to ( minimum ininimuni ) ---------------------------- 119 Minimum ( mean inean ) ( month inontli ) ( January ) -------- ft ----------- 5,680 ( Maximum Nlaximuni ) ( mean inean ) month ( June ) ( --------------------------- ) 62,400 Average ( number nionber ) of ( days lays ) in year the ( jloiv floto ) is less than the ( mcanMischarge meandischarge ) of 19,500 ( second-feet secondfeet second-fcct secondfcct ) January July ( -------------------- ) 10 4 . February _ August ( ------------------ ) 26 ( March Marcli ) ------------------ 28 September ( -------------- ) 24 April October ----------------- P ( May- May ) _ ( --ft ft ) ( November Noveniber ) ( --------------- ) 29 ( June J11110 ) ( December December- December ) 31 Floods of 30,000 ( second-feet secondfeet ) and over have ( oc- oc ) curred in all months except November , December , January , and February , and 60.8 per cent of : the total ( run-off runoff ) occurs in the three months , May , June , and July . ( Low-water Lowwater Low--tvater Lowtvater ) flows of less than 6,000 ( second-feet secondfeet ) have occurred in all months except March to July . Richardson ( Abs . R . vol . 2 , p . 941 ) , following observations extending over a year , says , " during , that period , I observed that the stream ( Green River ) was . one of erratic and irregular regimen . " Rapidity of change in flow The Colorado , Green , and San Juan Rivers , in - ( -common common common ) with all rivers draining an ( arid and ) or semiarid region , are subject to very sudden floods . The ( hydro- hydro ) ( graphs -graphs graphs ) of daily discharge ( Compl . Exhibit 79 ) show . vividly the rapidity with which the flow conditions . ( -change change change ) . A few of the more outstanding changes , are shown in the ( Master's Masters ) Report , p . , 105 , but Lees Ferry should be included . |