Laserfiche WebLink
<br />hy FLO-2D of potential debris flow depths in channels, it may also he an artifact of the <br />10 meter DEM used to create the topography for the grid system of the model. All of the <br />measured depths that exceeded the model estimations were 2 meters or less. Many of <br />thcse channels were incised by the debris flow events. This incision would not appear on <br />a 10 mcter OEM even if it had been input into the grid system prior to the model run. <br /> <br />Modeled vs Measured Debris Flow Depths, <br />Aug & Sept 2002 Events, Missionary Ridge Fire Area <br /> <br /> 200 <br />~ 180. <br />0 160. <br />u: . Channel Depths <br />Ul Ul . <br />.- '" 140. <br />-.c 120. <br />.Q " -t Flood Plain Depths <br />'" " 100. . <br />0'- <br />"0:5 80 <br />'" Q. S <br />- '" 60 - Measured=Modeled <br />~c 40. . Data <br />.. <br />'" . <br />:;: 20. . . <br /> 0 <br /> 0 50 100 150 200 <br /> <br />Flo-2D Depth inches, 100 yr storm <br /> <br />Figure 1. Modeled debris flow depths plotted with measured debris flow depths for debris <br />flow events that occurred in August and September of 2002. <br /> <br />Missionary Ridge Fire: Single Event Debris Flow 8-17~03 <br /> <br />Debris flow depths (n=IO) were measured in four basins for a debris flow event <br />that occurred on 8-17-03 within the Missionary Ridge fire area (Figure 2). Fresh mud <br />lines were measured on 8-18-03. This event had an avemge stoml intensity of 0.2 inches <br />per hour with a total stonn precipitation amount of between 0.14 and 0.47 inches, whieh <br />constitutes a 5 ye<lf storm event. Allmcasured data were within the range of depths <br />predicted by FLO-2D. <br />