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The flooding sources studied in detail are Big Dry Creek, Little Dry Creek, Goldsmith Gulch, West Tributary to Goldsmith Gulch, Greenwood Gulch, and Prentice Gulch. The areas studied in detail were chosen with consideration given to all forecasted development and construc- tion through 1981, No streams within the city of Greenwood Village were studied by approximate methods. 2.2 Community Description The City of Greenwood Village is located in western Arapahoe County, in central Colorado, south of the City of Denver, At the time it was incorporated in 1950, Greenwood Village had an area of 3 square miles that was used primarily for residential and agricultural purposes. In 1968, the city essentially doubled in size by annex- ation eastward to Dayton street and now consists of approximately 6 square miles. The communities adjacent to the City of Greenwood village are the City of Cherry Hills Village and the City of Denver to the north, the City of Littleton to the west, and unincorporated areas of Arapahoe County to the west, south, and east. The climate of the area is considered pleasant with an annual mean temperature of 50.20F. The average annual rainfall is 14 inches with 45,6 inches of snowfall, The stream basins are narrow, hydraulically steep, and composed of highly erodible, clay-loam soils, In undeveloped portions of the basins, the ground cover is predominantly a short grass called buffalo grass. As there are only four residential structures loca- ted within the lOa-year flood boundary, the flood plain can be considered basically undeveloped. 2.3 Principal Flood Problems Runoff as a result of high intensity thunderstorms is the primary cause of flooding in the City of Greenwood Village, The rain falls mainly in the plains and is most frequently experienced during the months of May through September, Flood plain development within the corporate limits of Greenwood Village has been minor in comparison to communities further downstream. Therefore, floods on the stream within the study limits have never caused enough damage to warrant news coverage or recorded information within the community. During flood stages, considerable damage is caused downstream in the com- munities of Englewood and Denver where flood plains are more devel- oped. The maximum flood of record on Little Dry Creek occurred on September 10, 1933, with an estimated discharge of 10,000 cubic feet per second (cfs) near the mouth (Reference 1), Since the construction of the Englewood Dam, minor flooding has occurred on Little Dry Creek on August 5, 1945; August 2 and 3, 1951; 3