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News Release

U.S. Department of the Interior
U.S. Geological Survey

Release: September 19, 1997
Luis A. Fusté, Information Officer

Technical Announcement 97-1

Two new fact sheets have just been released by the U.S. Geological Survey (USGS), Washington Water Science Center, in Tacoma, Washington.

Fact Sheet 228-96, "What Causes Floods in Washington State?," by David Kresch and Karen Dinicola, discusses several of the naturally occuring factors responsible for most of the floods in Washington, how man-made changes in a river basin affect floods, as well as the general role of the USGS in monitoring streamflows throughout the State in order to assist other agencies in flood forecasting.

Fact Sheet 229-96, "The `100-Year Flood,'" by Karen Dinicola, discusses the common misconception that 100-year floods occur only once in a 100-year period. In reality, a 100-year-flood may occur more than once or not at all during any particular 100-year period. The fact sheet also explains the need to update the estimated flow expected in a 100-year flood as more and more data becomes available for a particular river. This shows the importance of continued river monitoring.

Copies of Fact Sheets 228-96 and 229-96, are available free from the U.S. Geological Survey, 1201 Pacific Avenue, Suite 600, Tacoma, WA 98402, telephone (253) 593-6510 or by email at Another location to obtain free copies is the Earth Science Information Center, Room 135, U.S. Post Office, West 904 Riverside Avenue, Spokane, WA 99201, telephone (509) 353-2524, or by email at

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