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<br />amount oftime allocated to this project and also due to the fact that these storms did not <br />appear to greatly exceed others already documented with both precipitation observations <br />and streamflow information. <br /> <br />5) Site Specific Studies and Data From Other States <br /> <br />Evaluations of extreme precipitation are ongoing in other states outside of Colorado. <br />Montana, Wyoming and Utah are or have been conducting studies pertaining to <br />uncertainties in estimates of probable maximum precipitation affecting spillway design in <br />the Rocky Mountain region. The National Weather Service Office of Hydrology has been <br />completing an update of precipitation-frequency statistics including estimates of return <br />period precipitation amounts for 100 to 1,000 years for the neighboring states of New <br />Mexico, Arizona and Utah. Also during recent years there have been a small number of <br />site specific analyses of probable maximum precipitation performed by meteorological <br />consultants in support of water storage projects being designed and built. These reports <br />could contain information about extreme local storms that may not have otherwise been <br />included. <br /> <br />An effort to collect and assemble information on site specific studies and data from nearby <br />states was undertaken with the help of Alan Pearson of the Colorado State Engineer's <br />Office. A set offormal reports as well as informal data tabulations were assembled from <br />surrounding states along with reports containing site specific evaluations of probable <br />maximum precipitation for locations in Colorado. All reports were read, some were saved <br />as a part of the hardcopy Extreme Precipitation Data Study archive at the Colorado <br />Climate Center and other reports were returned as requested Several additional storms <br />from both in and outside of Colorado were identified as a result of this activity. <br /> <br />The following is a list of some of the reports and data sources assembled: <br /> <br />. A Centennial Survey of American Floods. Fifteen Significant Events in the United <br />States 1890-1990. NOAA Technical MemorandumNWS SR-133. Fort Worth, TX. <br />October 1990. <br /> <br />. Characteristics of Extreme Precipitation Events in Washington State. Washington <br />State Department of Ecology, Water Resources Program. Melvin G. Schaefer. <br />Olympia, WA October 1989. <br /> <br />. Estimating Bounds on Extreme Precipitation Events. National Research Council, <br />National Academy Press. Washington D.C. 1994. <br /> <br />. Greatest Known Areal Storm Rainfall Depths for the Contiguous United States. <br />NOAA Technical Memorandum NWS HYDRO-33, Silver Spring, MD, December <br />1976. <br /> <br />17 <br />