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<br />For Dry Gulch (Lakewood Gulch Tributary), there are no accurate <br />records of flood history available; however, it is well known that <br />there have been numerous instances of minor damage occurring at <br />several locations along the stream (Reference 12). <br /> <br />Prior to 1965, Harvard Gulch experienced regular flooding due to <br />summer thunderstorms, Considerable encroachment of the floodplain <br />and channel occurred because of the lack of city zoning designed to <br />prevent such encroachment. The infringement on the channel was so <br />complete that the defined channel ended approximately 0,5 mile from <br />the South Platte River, Floodwater, searching out a route to the <br />river, flowed down South Broadway, an important neighborhood <br />business street (Reference 13). The Harvard Gulch Flood Control <br />Project, completed in 1966, was designed for the 10-year flood and <br />has alleviated these problems, The largest flood event since the <br />completion of this project occurred on June B, 1969, Three gages <br />in this basin recorded between 1,2 inches and 2.6 inches of <br />rainfall in a I-hour period. The runoff hydrograph for this event <br />was recorded at the gaging station near South Logan Street, The <br />hydrograph peak was approximately 1,600 cfs, and this flow was <br />confined within the drainage improvements (Reference 14). <br /> <br />. <br /> <br />For Goldsmith Gulch and Southmoor Park Tributary, little <br />information is available on past flooding because development was <br />sparse in these areas, Flooding indicative of what might be <br />expected under present conditions occurred on May 5 and 6, 1973, <br />when the capacities of the crossings at Dartmouth and Yale Avenues <br />were exc'eeded by what was estimated to be a 5- to 10-year event <br />(References 15 and 16). <br /> <br />Major floods have not occurred on Sanderson Gulch in the last 20 <br />years and prior to that time there are no accurate records <br />available (References 17 and 18). <br /> <br />For Weir Gulch, First Avenue Tributary, and Dakota Avenue <br />Tributary, historical information on flooding is scarce, A few <br />instances of flooding resulting in minor basement damage and some <br />channel and bridge damage have been reported (References 19 and <br />20). <br /> <br />There were major floods on Sand Creek in 1896, 1912, 1917, 1921, <br />1933, 1938, 1948, 1957, and 1965. Because the basin was <br />essentially undeveloped up to approximately 1940, flood damages are <br />not well documented. The 1948 flood had a discharge at the mouth <br />estimated at 10,500 cfs. Resulting damages throughout the basin <br />were over $130,000, Near Stapleton International Airport the 1957 <br />flood had a discharge estimated to be 25,000 cfs. Total damages <br />throughout the basin were in excess of $330,000. The 1965 flood <br />resulted in damages of $2,517,000 along Sand Creek. The discharge <br />below Toll Gate Creek (located upstream in the City of Aurora) was <br />18,900 cfs (Reference 21), <br /> <br />Little definitive data on past flooding on First Creek and First <br />Creek Tributary are available due to the sparse development in the <br /> <br />10 <br />