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Coon Creek The Coon Creek basin is undergoing rapid development, with more proposed for the future. The emphasis is on channel improvements that will confine the lOa-year flood to the channel. Individual developers are constructing the channel improvements as new subdivisions are built adjacent to the existing channel. Improvements have been made to the Coon Creek Drainageway to provide for development of a shopping center. The channel improvements provide conveyance of the lOa-year flood from State Highway 121 to a point approximately 1,850 feet upstream (Reference 25). . Harvard Culch. West Harvard Gulch. Drv Gulch (Harvard Gulch Tributarv) Several drainage improvement projects have been constructed in the Harvard and West Harvard Gulch basins over the last 15 years. The more extensive improvements were made on Harvard Gulch as part of the Harvard Gulch Flood Project, which was the result of a $2.3 million bond issue passed by Denver in 1964. This project included an underground box cuI vert from South Logan Street to the South Platte River where the channel had been obliterated by development. A grass-lined channel was designed through Logan Park; this channel also serves as an inlet to a detention pond in the park. Above Logan Park, from South Ogden Street to South Downing Street, improvements included a se~ond box culvert. This culvert connects with a high-velocity concrete channel from South Downing Street upstream to South Race Street. Above South Race Street, improvements were made to the existing grass-lined channels. The system will safely convey floodflows slightly less than what could be expected to result from a la-year storm event. In addition, since 1964, several storm sewer systems have been constructed in this basin. The most extensive system is along Dry Gulch (Harvard Gulch Tributary). There, the storm sewer serves to intercept nuisance flows that would otherwise flow through residential lots where this channel has been obliterated. The storm sewer is designed to convey the la-year storm. t In the West Harvard Gulch basin, the main drainageway improvement is an underground conduit that extends from just above the Burlington Northern Railroad to South Zuni Street. The conduit handles West Harvard Gulch low flows, and an improved grass-lined channel above these culverts carries overflows during flood events. The West Harvard Gulch channel in this area will pass the lOa-year flood with only minor overbank flooding (Reference 14). Goldsmith Gulch and Southmoor Park Tributarv Development has encroached on the Goldsmith Gulch particularly through Denver where various structural floodplain, improvements 13