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<br /> <br />3.0 PROCEDURE <br />Ground-water inflow and outflow were calculated using <br />the mass balance method as follows: <br />U D± DS + E- T+ P± G <br />where <br />U = upstream discharge <br />D downstream discharge <br />~~ DS = change in channel storage <br />'E evapotranspiration losses <br />-T = tributary inflow <br />-g = pumpage for irrigation diversions <br />~.,G ground-water inflow or outfloca <br />• <br /> <br />~~ <br />During the periou ~f t<<is ~tu3y, T and ? were ::~~h <br />zero, except for the infloca from Williams Fork. <br />3.1 Discharge Measurements <br />The investigation was performed over a four day period, <br />28-31 August 1978. The river was at a base-flow, relatively <br />steady-state condition. Flow at S.H. 13 ranged from 265 cubic <br />feet per second (cfs) on 28 August to 218 cfs on 31 August 1978. <br />No irrigation or other diversions were active, and Williams Fork <br />was the only flowing tributary, To determine if the river gains <br />or loses flow across the reach of interest, a series of discharge <br />measurements were made at the locations shown on Figure 2-1. All <br />measurements were made using standard U.S. Geological Survey <br />methods and equipment. To minimize error, all measurements were <br />made while wading using the same current meter, a Price Type AA <br />Meter No. 5-70. To minimize human error, on each day wading was <br />3-1 <br />