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. POPULATION AND STRUCTURES AT RISK INVENTORY METHODOLOGY The inventory of structures was conducted with supervisory assistance from Dan Bunting of the Pikes Peak Regional Building Department and Mark Matulik of the Colorado Water Conservation B.oard. Mr. Matulik and three students at UCCS were involved in gathering the data. Primary resources were the latest flood plain maps published by the Federal Emergency Management Agency. The maps indicated areas subject to potential 100 year and 500 year floods (floods with 1% and 0.2% annual frequencies). Data were collected by street addresses and classified under appropriate jurisdiction and tributary. Estimated error in the data collection phase is under three percent. Data from the 1980 census of population were used in estimating the population in these areas. The figure used was population per household. Each residential unit was counted as one household. As an example, five single family homes (or multi-family units) in census tract 34, which has 2.39 persons/household, equal 11.95 people. No adjustments for vacancies were made. . . . .1 Each jurisdiction was broken down by subtotals of single family structures, multi-family structures, residential units, single family and mUlti-family populations. A further break down was completed by tributary with the above subtotals (SFH, MFH, etc.). Other data on non-residential structures were also collected. All the information was compiled on computers at UCCS. ., INVENTORY RESULTS . The results of the regional inventory are summarized in Table 1 which shows the numbers of structures and people occupying the 100 year flood plains in the region and in the six jurisdictions with significant risk. (2) The Region contains 3,368 single family structures, 88 mUlti-family structures and a total of 3,979 residential units in its flood plains. The estimated population in these units is 9,338. In addition, 681 non-residential structures were inventoried. . I -------------------- .1 (2) Monument is omitted because it has only a single, non- residential structure" in the flood plain within its boundaries. . 6 .