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roadbed on many stretches of the Denver and Rio Grande Western Railroad. In the Silverton area, flooding caused $33,000 worth of damage to sewer facilities. 2.4 Flood Protection Measures No specific flood protection structures have been undertaken in the unincorporated areas studied. However, some flood protection measures are provided in the San Juan County Land Use Code (adopted June 30, 1976)" by the county. Chapter 10 of the Land Use Code (Reference 2) requires that any development or improvement in the identified flood plain hazard areas (depicted on a series of maps filed in the office of the Land Use Administrator) be granted clearance relative to potential adverse impact from or to flood plain hazards from the San Juan County Land Use Administrator or County Commissioners. No development on or over any portion of a floodway shall be permitted which would, during or subsequent to flooding, cause or result in (1) injuries to life, (2) damage to structures, (3) solid wastes in the flood plain area, (4) substantial debris being carried downstream, or (5) obstruc- tion affecting the flow capacity. Improvement in a potential flood plain area but outside a floodway shall be designed using construc- tion methods and practices that will either minimize or eliminate adverse effects of the flood hazard. There are no flood protection works on streams in the Town of Silverton; however, plannina for reconstructing the 14th Street bridge over Cement Creek ha~ been proposed to reduce the flood hazard area. Some flood protection measures are provided in the Building Regula- tions by the Town of Silverton (Reference 3). Article I (General provisions) requires that building sites be reasonably safe from flooding. If a proposed building site is in the flood hazard area, dny new construction or substantial improvement shall be so designed and constructed that flood damage will be either minimized or eliminated. Subdivision proposals and other new development shall meet the need to minimize flood damage. 3.0 ENGINEERING METHODS For flooding sources studied in detail in the community, standard hydrologic and hydraulic study methods were used to determine the flood hazard data required for this study. Floods having,recurrence intervals of 10, 50, 100, and 500 years have been selected as having special significance for flood plain management and for flood insur- ance premium rates. The analyses reported here reflect current conditions in the watersheds of the flooding sources. 6