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<br />Coon Creek <br /> <br />The Coon Creek basin is undergoing rapid development, wi th more <br />proposed for the future. The emphasis is on channel improvements <br />that wi II confine the 100-year flood to the channel. Indi vidual <br />developers are constructing the channel improvements as new <br />subdivisions are built adjacent to the existing channel, <br />Improvements have been made to the Coon Creek Drainageway to <br />provide for development of a shopping center, The channel <br />improvements provide conveyance of the 100-year flood from State <br />Highway 121 to a point approximately 1,850 feet upstream <br />(Reference 25), <br /> <br />., <br /> <br />Harvard Gulch. West Harvard Gulch, Drv Gulch (Harvard Gulch <br />Tributarv) <br /> <br />.' <br /> <br />Several drainage improvement projects have been constructed in the <br />Harvard and West Harvard Gulch basins over the la~t 15 years, The <br />more extensive improvements were made on Harvard Gulch as part of <br />the Harvard Gulch Flood Project, which was the result of a $2,3 <br />million bond issue passed by Denver in 1964, This project included <br />an underground box culvert from South Logan Street to the South <br />Platte River where the channel had been obliterated by development, <br />A grass-lined channel was designed through Logan Park; this channel <br />also serves as an inlet to a detention pond in the park. <br /> <br />Above Logan Park, from South Ogden Street to South Downing Street, <br />improvements included a second box culvert. This culvert connects <br />with a high-velocity concrete channel from South Downing Street <br />upstream to South Race Street. Above South Race Street, <br />improvements were made to the existing grass-lined channels. The <br />system will safely convey floodflows slightly less than what could <br />be expected to result from a 10-year storm event. <br /> <br />In addition, since 1964, several storm sewer systems have been <br />constructed in this basin. The most extensive system is along Dry <br />Gulch (Harvard Gulch Tributary). There, the storm sewer serves to <br />intercept nuisance flows that would otherwise flow through <br />residential lots where this channel has been obliterated, The <br />storm sewer is designed to convey the 10-year storm. <br /> <br />In the West Harvard Gulch basin, the main drainageway improvement <br />is an underground conduit that extends from just above the <br />Burlington Northern Railroad to South Zuni Street, The conduit <br />handles West Harvard Gulch low flows, and an improved grass-lined <br />channel above these culverts carries overflows during flood events. <br />The West Harvard Gulch channel in this area will pass the 100-year <br />flood with only minor overbank flooding (Reference 14), <br /> <br />Goldsmith Gulch and Southmoor Park Tributarv <br /> <br />Development <br />particularly <br /> <br />has encroached on the Goldsmith Gulch <br />through Denver where various structural <br /> <br />floodplain, <br />improvements <br /> <br />13 <br />