The third and final runoff forecast of the season for the Lake Chelan Basin is now posted on the PUD website. The amount of runoff is forecast at 120 percent of average, an increase from the March forecast of 100 percent of average. Scott Buehn, PUD resource engineer/analyst, based his calculations on a range of information and analysis including automated Snotel data and snowpack measurements collected the last week of March during a helicopter trip into the mountains above Lake Chelan.
Last year the actual runoff from snow melt into Lake Chelan from April 1-July 31 was 126 percent of average.
The elevation of Lake Chelan on April 1 was 1083.5 feet above sea level, which is 1.9 feet lower than the expected average under the current operating license and 1 foot lower than last year.
Generation at the Lake Chelan Hydro Project will be managed this winter and spring with the intent of meeting operating objectives in the Lake Chelan Hydro Operating License as well as minimum lake elevation targets.
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