Laserfiche WebLink
<br />.,; . <br />" <br /> <br />.-' <br /> <br />alternately carried large and small amounts of sediment along Jim Creek <br />(similar to the Lawn Lake flood of 1982 in the Roaring River ,Rocky <br />Mountain National Park). Hence, the reconstructed discharge in the <br />depositional reaches probably was a hyperconcentrated flow reflecting a <br />combination of sediment and water discharge. The reconstructed discharge <br />in the nondepositional reach reflects primarily water discharge. The <br />flood deposits in Jim Creek provide good indirect evidence for the <br />bulking/debulking of water with sediment. <br /> <br />Because of the implications that a moderate rainstorm may have occurred <br />above 7,500 feet and because of the need for data on these storms, I <br />believe that a study is needed to document this flood. Also, such a <br />study would improve the understanding of the hydrometeorology and <br />sediment transport of floods in mountain rivers of Colorado. Several <br />issues that need to be addressed are to: <br />1. Survey channel cross sections and make hydraulic computations of peak <br />discharge at different locations along the channel. <br />2. Determine the amount and intensity of rainfall associated with the <br />flood. <br />3. Determine if the flood was associated with a failure of a beaver dam <br />upstream or an ice and snow dam resulting from an avalanche in the <br />upper basin. <br />4. Determine the sediment concentration of the flood at different channel <br />locations. The stream provides a good example and conditions to <br />determine the bulking of streamflow with sediment. <br />5. Determine the age and date of the flood. <br />6. Determine the frequency of the flood. <br /> <br />l?:~YfPj~ <br /> <br />Robert D. Jarrett <br />Hydrologist <br /> <br />",'"-<<,;':,,,-< <br />