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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 second 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 10-perecent-annual-chance 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 10-percent-annual chance storm event. 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 I-percent-annual-chance flood with only minor overbank flooding (Reference 14). Goldsmith Gulch and Southmoor Park Tributary Development has encroached on the Goldsmith Gulch floodplain, particularly through Denver where various structural improvements have been made to provide a limited degree of conveyance for floodflows. Structural improvements along the downstream portion of Goldsmith Gulch include a berm constructed along the east edge of South Monaco Street Parkway near the confluence with Cherry Creek, and regrading of the floodplain in the vicinity of Evans Avenue. Improvements along the upstream portion of Goldsmith Gulch include the construction of the Eastman Avenue crossing of Goldsmith Gulch, and regrading within the floodplain at several locations throughout the reach. Southmoor Park, a large, open area along Southmoor Park Tributary, serves as a detention pond that reduces flood magnitudes along the tributary and along Goldsmith Gulch (Reference 15). Additional improvements include the construction of the Eastman Avenue crossing of Southmoor Park Tributary. Sanderson Gulch At the upper end of the Sanderson Gulch drainage basin, in the City of Lakewood, there are two irrigation storage reservoirs that affect the discharges along Sanderson Gulch during the major flood events. They are Smith Reservoir and Kendrick Reservoir. There are also a series of small reservoirs, lakes, and detention ponds along Sanderson Gulch upstream of Denver that offer some flood protection. 12