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. . . I, The regression equation for subregion Ark-4a is only valid for streams having drainage areas between I square mile and 26 square miles. 2. The regression equation for subregion ARK-4b is only valid for streams having drainage areas between 4 and 75 square miles. Streams for which the Colorado Springs FIS includes approximate floodplain information, which fall within the range of applicability of the Guidelines regression equations are listed below: Black Squirrel Creek, Douglas Creek North. Douglas Creek South. Dry Creek, Fishers Canyon (formerly labeled as Spring Run), West Tributary of Sand Creek (later relabeled as Sand Creek West Fork), and Smith Creek. For streams with drainage areas smaller than the minimum size for the above equations, the U.S. Geological Survey publication, Techniques For Estimating Regional Flood Characteristics of Small Rural Watersheds in the Plains Region of Eastern Colorado, can be used to supplement the Guidelines, The USGS publication can used for stream reaches with upstream watersheds larger than a lower limit of 0.25 to 0,5 square mile and smaller than an upper limit of25 square miles. Streams for which the Colorado Springs FIS includes approximate floodplain information, which fall outside the range of applicability of the Guidelines regression equations, but which fall within the range of applicability of the USGS publication are listed below: Unnamed tributary to Douglas Creek, West Tributary of Sand Creek (later relabeled as Sand Creek West Fork), Unnamed subtributary to West Tributary of Sand Creek, Templeton Gap Floodway, Templeton Gap South Tributary, and Unnamed tributaries to Cottonwood Creek. A procedure for determining hydrology information for approximate floodplains of lakes, ponds, local storm drainage areas, or overflows from irrigation canals and ditches has not been established. The hydrologic methodology developed in the Guidelines is appropriate for designation and approval of approximate floodplain information and for use in simple floodplain analyses for development such as open space, agriculture, farm bridges, pole barns, and individual residential structures. The Guidelines methodology is not appropriate for use with development involving residential subdivisions greater than 50 lots or occurring on sites greater than 5 acres, commercial construction, industrial construction, construction of public facilities, or construction of flood control facilities. 4