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Snow Surveys Provide Each winter millions of people
flock to the Eastern Sierra to enjoy the spectacular snow-covered mountains. The Eastern
Sierra's abundant snowfall Beyond its aesthetic and
recreational appeal, the Eastern Sierra snowpack plays a vital role as the primary water
source for more than 3.5 million City of Los Angeles residents. Approximately 65% of the
City's water comes from Eastern Because Los Angeles relies upon the Eastern Sierra for most of its water, accurate snow measurements are vital in order to forecast each year's water supply. Each winter, DWP hydrographic crews provide the data needed for forecasting by conducting snow surveys. By actually measuring the depth of snow and amount of water content in the snow at specific locations over a period of many years, forecasters can accurately predict the amount of runoff each year.
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offers great downhill and cross-country
skiing, snowboarding, snowmobiling, sledding and many other winter activities. As winter
gives way to spring, the melting snow supplies vital water flows that fill the many creeks
and lakes in the area. The creeks and lakes provide habitat for fish and other wildlife,
while offering countless outdoor summer recreation opportunities for visitors and
residents alike.
Sierra surface water
runoff. The rest of Los Angeles' water supply comes from the Colorado River, California's
Central Valley and groundwater sources within the Los Angeles city limits.
Many important decisions depend
upon accurate water supply forecasting. The availability of water for irrigation needs,
reservoir storage and operation, groundwater pumping levels, hydroelectric generation,
maintenance programs, recreation availability and even the possible need for water
rationing all rely on accurate water supply forecasting.