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