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For Dry Gulch O.a.l<ewood Gulch Tributary), there are no accurate records of flood history available; however, it is well Known that there have been numerous insta.nces of minor damage occurring at several locations along the stream (Reference 12). Prior to 1965, Harvard Gulch experienced regular flooding due to suImler thunderstorms. Considerable encroachment of the floodplain and channel occurred because of the lack of city zoning designed to prevent such encroachment. The infringement on the channel was so complete that the defined channel ended approximately 0.5 mile from the South Platte River. Floodwater, searching out a route to the river, flowed down South Broadway, an important neighborhood business street (Reference 13). The Harvard Gulch Flood Control Project, completed in 1966, was designed for the la-year flood and has alleviated these problems. The largest flood event since the completion of this project occurred on June 8, 1969. Three gages in this basin recorded between 1.2 inches and 2.6 inches of rainfall in a I-hour period. The runoff hydrograph for this event was recorded at the gaging station near South Logan Street. The hydrograph peak was approximately 1,600 cfs, and this flow was confined within the drainage improvements (Reference 14). For Goldsmith Gulch and Southmoor Park Tributary, little information is available on past flooding because development was sparse in these areas. Flooding indicative of what might be expected under present conditions occurred on May 5 and 6, 1973, when the capacities of the crossings at Dartmouth and Yale Avenues were exceeded by what was estimated to be a 5- to 10-year event (References 15 and 16). Major fl oods have not occurred on Sanderson Gulch in the las t 20 years and prior to that time there are no accurate records available (References 17 and 18). For Weir Gulch, First Avenue Tributary, and Dakota Avenue Tributary, historical information on flooding is scarce. A few instances of flooding resulting in minor basement damage and some channel and bridge damage have been reported (References 19 and 20) . There were major floods on Sand Creek tn 1896, 1912, 1917, 1921, 1933, 1938, 1948, 1957, and 1965. Because the basin was essentially undeveloped up to approximately 1940, flood damages are not well documented. The 1948 flood had a discharge at the mouth estimated at 10,500 cfs. Resulting damages throughout the basin were over $130,000. Near Stapleton International Airport the 1957 flood had a discharge estimated to be 25,000 cfs. Total damages throughout the basin were in excess of $330,000. The 1965 flood resulted in damages of $2,517,000 along Sand Creel<. The discharge below ToLl Gate Creel< (located upstream in the City of Aurora) was 18,900 cfs (Reference 21). LittLe definitive data on past flooding on First Creek and First Creel< Tributary are available due to the sparse development tn the 10