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flood, but it did cause some street and rail-road damages as well as damage to private property - which included extensive water damage in basements and a few fences that were destroyed or washed away. Water up to four feet deep was reported along the Central Avenue. Many homeowners spent time to clean mud from their yards and driveways. Precipitation records are incomplete however there are data for one period from 1940 to 1984 for the Canon City location. The greatest one day recorded rainfall occurred in 1955 (2.74 inches). There were ten occurrences of 2.0 or more inches of rainfall during the period of record. INVESTIGATIONS AND ANALYSIS A. Interpretation and Use of Report 1. Frequency and Discharge: The 10-year, 2s-year, 50-year, lOa-year, and sOO-year flood events are used as the flood frequencies for this flood plain analysis. Thus, the data developed in this report will be suitable not only for regulation purposes, and H.B. 1041 designation but is also consistent with the Federal Insurance Administration flood insurance studies conducted by the Federal Emergency Management Agency. These various flood events have an average occurrence of once in the number of years as indicated. For example, the lOa-year flood occurs, on the average, once in a lOa-year period, and has one percent chance of being equaled or exceeded in any given year. The particular uses for the various flood events in addition to those stated above are as follows: lO-year, 2s-year, and 50-year Flood Events Information regarding these lower frequency floods is especially useful for future engineering studies and land-use planning purposes related to minor road systems, minor channel improvements, the location of parks and recreational facilities, agricultural lands, and appurtenant structures, The use of the lower frequency floods may be considered in planning flood prevention projects to protect agricultural areas, or other property where risk to life is not a factor. 100-Year Flood Event The lOa-year flood event may be used in lieu of lower frequencies for engineering design purposes where greater security from flooding is desired. However, the most important use of the lOa-year flood event lies in flood plain management and land-use planning as set forth in the state statutes. The State of Colorado and the Federal Government consider the laO-year frequency flood as the flood event to be used in designing and protecting structures and dwellings for human occupation, Therefore, all flood plain regulations are based on the lOa-year flood. sOO-year Flood Event The sOO-year flood event may be used to show the upper level of flood plain management, or for a certain critical type of construction such as 6