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<br />1II-6 <br /> <br />A backwater analysis program developed by the U. S. Bureau of <br />Reclamation was used to determine the depth of flooding for storms of <br />various frequencies. Volume II of this Report shows the flood plain <br />limits for the 100-year return interval flood. The extent of flooding <br />represented by the present peak and that projected peak for 1990 con- <br />ditions are virtually identical so the flood plain limits shown in Volume <br />II reflects present conditions and conditions after development of the <br />basin was complete. <br /> <br />DESCRIPTION OF THE EXTENT OF FLOODING <br /> <br />The inundated areas during the 100 -year flood are shown in Volume <br />II. Flooding upstream of Baseline Road encroaches on man-made devel- <br />opment only in isolated areas. Downstream, or north of Baseline Road, a <br />greater number of dwellings will be inundated during the 100 -year return <br />interval flood. Assuming that the development of the basin is consistent <br />with the Boulder Valley Comprehensive Plan, only very minor amounts <br />of additional construction would be allowed in the flood plain. Therefore, <br />principal attention for flood protection should be directed to the develop- <br />ment north of Baseline Road. <br /> <br />