Laserfiche WebLink
<br />tool, and the effectiveness of each tool for eliminating or <br />reducing the hazards when the projected future development <br />density is achieved. The following discussion centers on <br />the relationships between the four factors and manngement <br />.tool applications. Then recommended management tools are <br />discussed for different development conditions. <br /> <br />Effect Qi Haz~rd ~ <br />The flood hazards Which are common on alluvial fans are <br />substantially different from typical hazards associated with <br />riverine flooding. Consequently, measures for controlling <br />or eliminating these hazards on fans must be viewed <br />differently. <br /> <br />. <br /> <br />Elevation on unarmored fill <br />unarmored levees and dikes <br />destruction of these measures <br />problems. <br /> <br />and <br />may <br />due <br /> <br />use of <br />result in <br />to scour <br /> <br />, <br /> <br />. Channels and levees may be filled or rendered <br />useless by sediment deposition, and will <br />require dilligent maintenance. <br /> <br />. <br /> <br />Local dikes designed to protect small <br />will divert flood flows to other parts <br />fan and cause concentration of much <br />damages at other locations. <br /> <br />areas <br />of the <br />higher <br /> <br />. Flood detention facilities must allow for large <br />amounts of sediment deposition. <br /> <br />. The erratic and unpredictable nature of flood <br />paths makes local protection of structures or <br />subdivisions difficult because the location and <br />direction of peak flood flows cannot usually be <br />predicted. Such local measures must be <br /> <br />88 <br />