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1 1 1 1 1 1 1 1 1 1 1 1 1 I 1 1 1 1 I, The smallest basin in the study area is Lakewood Gulch. The Lakewood Gulch portion of the study area contains 1.35 square miles (see Table 1). The basin is comprised of Drainageways E and F totaling 4.20 stream miles of flood hazard delineation. Drainageway E is known as Jack Rabbit Gulch and F is the main stem of Lakewood Gulch. The flood hazards for the reaches of lakewood Gulch below the limits of the Green Mountain study area were pre- viously investigated in Phase A Preliminary Report on Major Drainageway Planning on lakewood and McIntyre Gulches Volume I Report (Reference 10). The Lakewood Gulch basin and hydrological feature descriptions were set forth in Project Reuse. Again the study area contains only a portion of the basin defined by Project Reuse, so that a direct comparison cannot be made. However, no significant changes in the boundaries or description have resulted from the Green Mountain study. The drainage area on the north side of Green Mountain is tributary to Lena Gulch and contains 2.36 square miles. The basin is comprised of Drainageways G and H, totaling 5.55 stream miles of flood hazard delineation. The flood hazards for the reaches of Lena Gulch below the limits of the Green Mountain study area were previously investigated in Lena Gulch Master Drainage Plan (Reference 11). The Lena Gulr.h basin and hydrological feature descriptions were previously set forth in Project Reuse. No significant changes to the boundaries or the hydrological feature descriptions have resulted from the Green Mountain study. The largest basin in the study area is the tributary to Bear Creek and contains 7.16 square miles. The basin is comprised of Drainageways J, K, and L, totaling 17.4 stream miles of flood hazard delineation. Drainageway J is known as Rooney Gulch and flows south adjacent to the hogback, Drainageways K and L are unnamed. Rooney Gulch is tributary to Bear Creek above the Bear Creek Dam, while K and L are tributary below Bear Creek Dam. The Bear Creek basin and hydrological feature descriptions were previously set forth in Project Reuse. No significant changes to the boundaries or hydrological feature descriptions have resulted from the Green Mountain study. B. Hi story The urbanization of the McIntyre Gulch portion of the study area began in early to mid 1960's with the first filings of the Green Mountain subdivision. Development was platted on Green Mountain prior to the incorporation of the City of Lakewood in 1969. The drainage problems in the basin are the result of encroachment upon the drainageways by the development without adequate floodway easements or maintaining channel sections. In addition, the impervious areas of the developments (i.e., streets, parking lots, roofs) have increased the amount and rate of runoff, which aggravated the erosion and increased the hazards. The urbanization of the Lakewood Gulch portion of the study area began in the early 1960's north of 6th Avenue with the platting of Daniels Garden and is continuing south of 6th Avenue with the development of Union Square and 6th Avenue West in the 1970's. The pattern of development from lower basin to upper without providing adequate drainage facilities, has aggravated the drainage problems in the lower basin. Urbanization of the Lena Gulch portion of the study area began prior to World War II, with the platting of the Pleasant View area north of 6th Avenue. The residential/industrial area south of 6th Avenue was developed in the 1960's. The Jefferson County Fairgrounds area, which was first used 3