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<br />Flood hazard data developed in this report are based on existing channel <br /> <br /> <br />and flood plain conditions with runoff factors adjusted to reflect <br /> <br /> <br />future developments. Comparison of present and future runoff 4~ta <br /> <br /> <br />showed insignificant differences from projected changes in land use. <br /> <br /> <br />Rationale for these results are: (1) Potential developments are <br /> <br /> <br />located in the lower reaches of the watershed where a slight amount of <br /> <br /> <br />additional runoff has a minor effect on the magnitude of flood flows <br /> <br /> <br />which create the heights of the 100-year frequency flood, and (2) the <br /> <br /> <br />major portion of runoff originates in the upper watershed where a small <br /> <br /> <br />amount of land use change is anticipated. <br /> <br />Non-residential construction must meet the same standard or be <br />flood proofed-to that level. <br /> <br />The 1968 act benefits owners of structures already in the flood-prone <br /> <br /> <br />areas by providing insurance that had been unavailable through private <br /> <br /> <br />companies. The act created a cooperative program of insurance against <br /> <br /> <br />floods by the private flood insurance industry and the federal government. <br /> <br />FLOOD PLAIN MANAGEMENT <br /> <br />Of upmost importance is the possibility of encroachment on the existing <br /> <br /> <br />flood plains. Developments within the flood plain could obstruct the <br /> <br /> <br />flow of flood water, raise the flood elevations, and create hazardous <br /> <br /> <br />velocities. Encroachment is a far more significant factor than the <br /> <br /> <br />additional runoff created by proposed developments. <br /> <br />The need for adequate floodways to carry the flows of the San Juan River <br /> <br /> <br />and McCabe Creek has been recognized by city and county ,planners. <br /> <br /> <br />Subdividers and developers are required to submit proposed storm drain- <br /> <br /> <br />age plans to the county planning commission for approval. In the past, <br /> <br /> <br />drainage plans have been prepared singularly or on a plat-by-plat basis. <br /> <br /> <br />Information contained in this report will be useful in developing a <br /> <br /> <br />master drainage plan for the study area. This report provides the <br /> <br /> <br />outline of flood hazard areas on large scale maps specifically for this <br /> <br /> <br />purpose. <br /> <br />The National Flood Insurance Act of 1968 (Title XIII of the Housing and <br />Urban Development Act, P.L. 90-448) recognized the necessity for flood <br />plain management. This act makes federally subsidized insurance available <br />to citizens in communities that adopt regulations controlling future <br />developments of their flood plain. In respect to encroachment on the <br />flood plain, the regulations require: <br /> <br />Flood Plain Regulations <br /> <br />New residential construction or substantial improvement of <br />existing homes must have the lowest level above the elevation <br /> <br />of the 100-year flood. <br /> <br />This study has been conducted in accordance with state technical require- <br /> <br /> <br />ments as required for review, designation, and approval by the Colorado <br /> <br /> <br />Water Conservation Board. Section 37-60-106, Colorado Revised Statutes <br /> <br /> <br />1973 authorizes the Colorado Water Conservation Board lito designate and <br /> <br /> <br />approve storm or floodwater channels or basins, and to make such designations <br /> <br />~ 19 - <br /> <br />- 20 - <br />