Snow Surveys and Water Supply Forecasting
Agriculture Information Bulletin 536
The beauty of snow is fascinating, and millions of Americans enjoy the
snow-covered landscape as a playground. But beyond its esthetic and
recreational appeal, snow plays a vital role in our lives as a primary
source of the water supply in the Western United States.
Increasing and often conflicting demands for water in the West have
heightened public awareness of the need for sound management decisions
concerning water. Although the West's high mountain ranges hold a vast
snowpack that provides 50 to 80 percent of the year's water supply, nature
cannot be relied upon to provide an uninterrupted, dependable supply of
meltwater to meet all the downstream requirements. To moderate this
variability, reservoirs and canals have been built to serve the growing
needs of agriculture, industry, and communities. But successful water
management begins with an adequate knowledge of the primary source of
water in the West: snow.
Obtaining accurate and timely information on the extent and water
content of the mountain snowpack requires specially trained people and
unique equipment. The Federal, State, and private cooperative snow survey
program directed by the U.S. Department of Agriculture's (USDA) Natural
Resources Conservation Service (NRCS) has met those needs since the
mid-1930's and continues to evolve in response to increasing demands of
water users. With a computerized data collection network and forecast
system, the program also fills many other requirements for hydrological
and climatological data useful in natural resources management and
research.
This booklet describes the cooperative snow survey program. It is
intended to provide the general public as well as water resource
professionals with a better understanding of the importance of snow,
snowpack surveys, and water supply forecasting in natural resources
management.
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