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STUDY AREA DESCRIPTION Community DescriDtion Boone is located in extreme southeastern Colorado. It is located approximately 19 miles east of Springfield. The area studied for the FHBM is the incorporated areas of the Town of Boone as of September 6, 1974. Watershed DescriDtion The Unnamed Tributary to Sand Arroyo which flows through Boone lies within the Arkansas River Basin Subregion 1, as set forth in the Guidelines For Determining IOO-Year Flows For Approximate Floodplains and has a drainage area of less than 25 square miles. In fact, it is approximately 1.5 square miles in size. As a result, the basin size is less than the lower limit for the Arkansas River Basin Subregion I, as set forth in the Guidelines For Determining IOO-Year Flows For Approximate Floodplains. Floodinl!: Problems and Floodinl!: History Convective type cloudburst storms sometimes lasting for several hours, can be expected to occur in the Boone area during the summer months. The cloudburst storms can cause high peak flows with a small water volume over a short duration. Flooding has occurred in Boone as recently as the summer of 1995 due to such storms. The Unnamed Tributary to Sand Arroyo is not shown on the Boone FHBM, but it has been a source of local flooding problems in the past. Flooding from general rainstorms may also occur during the months of June through September. General rainfall flooding is characterized by higher peak flows with a moderate volume and a moderate duration. Flooding is more severe when antecedent rainfall has resulted in saturated ground conditions or the ground is frozen and infiltration is minimal. Research of the study area yielded minimal information regarding major flooding events in Boone. In spite of the long history of human activity in Pueblo County, there are no historical accounts of major flooding on the Sand Arroyo Tributary within Boone. There have been, however, occurrences of high water in the past.