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0[2194 - 8 - The floor of the conduit was built in sections of grout, rubble masonry, and reinforced concrete. It is rough and eroded in spots causing considerable turbulence as flow increases. The sidewalls will be endangered by u~der-mining as the erosion increases in the older sections of the floor. Until the hydraulic characteristics of the conduit are improved, the full capacity of the conduit cannot safely be utilized. On Carbon Arroyo, extremely high velocities occur during flood stages and cause streambank erosion and damages to bridge abutments. The exposed water mains across Carbon Arroyo at South Second Street and at Main Street have been da~aged by past floods. Carbon Arroyo drainage is capable of producing floods with discharges in excess of those so far reported. Such discharges would result in serious damage to business establishments on Main Street and to the Colorado and Southern Railway bridge between Main street and the Purgatoire River. Sediment and Erosion Damage The principal sediment damage results from the deposition of silt. sand, gravel, and other debris on city streets and in commercial buildings. Removal of sediment and debris from streets, basements, and main floors of buildings involves considerable expense to the City of Trinidad and to private interests. Gully and streambank erosion are the principal sources of sediment. Sheet erosion is a minor source of sediment. Gully erosion is most evident in the middle portion of the watershed. Streambank erosion results in loss of rangeland in the lower watershed area. Problems Relating to Water Management There has been no expression of interest in providing capacity for water storage in the floodwater-retarding structures for irrigation, municipal, or industrial uses or for recreational and wildlife purposes. EXISTING OR PROPOSED WORKS OF IMPROVEMENT ." The Fishers Peak - Carbon Arroyos Watershed lies within the Purgatoire Soil Conservation District. The agricultural area inclUded in the watershed was voted into the District in 1959. The District and its cooperators are actively carrying out a soil and moisture conservation program with technical assistance furnished by the Soil Conservation Service. Basic conservation plans are being prepared on the six ranches that have portions of their units in the watershed. There are no other existing or proposed works of improvement of other agencies that would effect or be effected by the measures proposed in this plan.