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<br /> <br />... <br />,. <br /> <br />-:.. <br /> <br />Mud and debris flows at Slate Creek near Marble lodged mud <br />and boulders high in the trees, indicating a flow depth of at <br />least 10 feet higher than the present ground level. This was <br />a relatively minor event such as occurs on Slate Creek about <br />every five years. <br /> <br />involved. Removal of vegetation on steep slopes, dumping <br />debris and fi II In a mud fiow path and improper road bul idlng <br />or earth moving can contribute to a mud flow. The fai lure of <br />a dam, irrigation ditch or other water management structure <br />can Initiate mud/debris fiow If the escaping water can <br />sw i ft I Y aCGumu I ate a I erge vo I urne of so 1 I mater 1 a Is. <br />Slmi larly, a landsi ide which temporarily blocks a stream may <br />cause or contribute to a debris flow. <br /> <br />Mitigation <br /> <br />In most Instances very I ittle can be done to mitigate the mud <br />flow process In the channel itself. Property damage can be <br />prevented by recognizing natural mud flow areas and avoiding <br />them. In some cases unstable slopes can be revegetated or <br />reinforced to reduce the effect of large volumes of moving <br />water upon them. A series of check dams or other storm <br />drainage management practices may be considered in some <br />cases. Geologic investigations can identify areas of mud <br />flow potential and serve as a guide! ine for development of <br />mitigatIon plans. <br /> <br />Land Use <br /> <br />To prevent loss of I ife and property damage, areas subject to <br />mud/ debr i 5 f 10.5 shou I d not be deve loped. I n some cases <br />engineering geologic investigations may define the dynamics <br />of a severe mud/debris flow and allow steps to be taken to <br />d i reet it a'day from bu i I dings and other Improvements. <br /> <br />15 <br />