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n~~'''i5fl ~,_, ,~~ ... ; t. " J 7,000 6,000 5,000 '" ~ 4,000 U w rn 0:: w ll. e- w w u. u iii ::J U ~ w' CO 0:: ~ 7,000 U rn 15 :;: -0: w 0:: e- rn ~ <( '" 3,000 2.000 1,000 o 1988 1975 1976 1977 1978 1979 1980 1981 1982 1983 WATER YEAR 6,000 5.000 4,000 3,000 2,000 1,000 o 1984 1985 1986 1987 Maximum........... OCT NOV DEe JAN FEB MAR APR MAY JUNE JULY AUG SEPT MONTH Figure 3, Daily stream discharge and maximum, average, and minimum daily stream discharge at site 4, water years 1975-88. sUl\lmer, but runoff contributions to the annual stream- flow of the White River directly from rainfall generally are small. Annual stream-discharge data in acre-feet for water years 1975-88 at sites 1-4 were available, but annual stream-discharge data for sites 5 and 6 in the lower White River were available only for water years 1983-88. To facilitate comparisons of annual data between all sites for 1975-88, estimates of annual stream discharge at sites 5 and 6 for water years 1975- 82 were needed. Because most tributary streams to the White River downstream from site 4 are ephemeral, it was assumed that during years of moderate and low runoff, the sum of the annual runoff (excluding small quanti- ties of streamflow depletions for irrigation) measured at site 4 and station 09306222 would closely approxi- mate the annual stream discharge at site 5. Similarly, the sum of the annual runoff at site 4 and stations 09306222 and 09306255 would reasonably approxi- mate the annual stream discharge at site 6. Annual stream discharge at site 5 was calculated for water years 1975-82 as the sum of the annual discharge from site 4 and station 09306222. Values of calculated data for the study period (water years 1975-88) and mea- sured annual discharge (water years 1983-88) at site 5 are correlated with annual stream discharge at site 4 in figure 4. A similar computation that also included annual stream discharge from station 09306255 was made for site 6 for water years 1975-82 (station 09306255 was discontinued for several years after water year 1982). The calculated annual stream dis- charge (water years 1975-82) and measured annual stream discharge (water years 1983-88) at site 6 are correlated with annual stream discharge at site 4 in fig- ure 4. A regression was made between data sets of cal- culated and measured annual stream discharge at sites 5 and 6 and annual stream discharge at site 4. By using standard analysis of covariance techniques, no differ- ences between regressions were measured between the calculated and measured values at each site at the 0.05 level of significance. INTRODUCTION 7