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I I I I I I I I I I I I I I I I I I I 15 Dry Gulch from Harlan Street to Zephyr Street (Sheets 9,lO,ll) The Dry Gulch channel throughout this reach is qenerally well defined, although it has frequently been replaced by conduits of inadequate size. In every case, the conduits create back- waters which cause inundation of street crossings and structures. The natural channel is frequently unable to contain the lOO-year flood, partly because the banks are lower than those in the reach east of Harlan, and partly because of the frequent street crossings and backwater effects. The structures near the gulch in the reach are predominantly residential, ranging from single family homes to multi-story apartments. been constructed in the low area near the channel, and are there- fore subjected to major flood potential. West of Lamar Street and between Saulsbury and pierce Streets, the gulch has been channelized into narrow drainageways between apartments. The channels are capable of conveying the lOO-year flow, except that backwater effects created at the downstream ends of the channels cause flooding along them. Dry Gulch from Zephyr Street to Carr Street (Sheet 8) In this reach the Dry Gulch channel has been severely constricted by the railroad bed of the Associated Railroad Co. and by res- idential construction. The location of the natural watercourse through this area is not apparent, but the channel in existence today is totally inadequate to convey a IOO-year flood. The flood plain is extensive in this reach, indicating significant potential damage. Residents of this area report flood damage on a yearly basis, indicating that even small floods have been troublesome. This fact serves to emphasize the potential damage from severe floods. Erosion damage has occurred along the road- bed of the Associated Railroad Co., which forms the south bank of the gulch between Brentwood and Ammons Streets. This has prompted the Railroad to dump "rip-rap" along the bank, thereby further reducing the capacity of the channel. An area of widespread flooding exists between Saulsbury and Upham Streets, primarily because of inadequate culverts installed under Saulsbury Street and between Teller and Upham Street. A second area of widespread flooding occurs west of Wadsworth Boulevard, due in part to the backwater created by the culvert under the street and in part to the fact that the channel is quite shallow between Wadsworth and Zephyr. Apartments have Dry Gulch from Carr Street to Garrison Street (Sheets 7, 8) Between Carr and Garrison Streets, the Dry Gulch channel is still visible in a natural condition, but lS incapable of conveying the lOO-year flood. A considerable amount of commercial develop- ment has occurred in the past two years along the channel; the development has served to increase the likelihood of flood damage as additional constrictions to the channel have been built.