Sevier Lake Basin



Observed flows over the Sevier Lake Basin were much above average for the April-July period. Early season snowpack was near average over most of the Basin. Frequent storms throughout the spring increased the snowpack to much above average by late spring, particularly at high elevations. Heavy rain on snow events at mid and low elevations caused high flows at several times during the spring months.

Forecasts throughout the spring generally were for above to much above average runoff for the April-July period and were influenced by the heavy snowpack. However, the forecast procedures did not account for the unusually heavy rain on snow events that occurred. Therefore forecasts throughout the season generally underestimated the resulting observations. Forecasts were increased as the season progressed and late season forecasts proved to be closer to the actual observed runoff.

Observed flows were generally near or exceeded the 10% exceedance probability values, indicating the unusual conditions during the spring of 1995. Heavier than normal rain and rain on snow events in the spring contributed to a greater than expected runoff.

Current data are unavailable for the numerous diversions existing in the Sevier Lake Basin. Therefore natural observed flows within the Sevier Lake Basin are subject to question.