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Last modified
11/23/2009 1:21:33 PM
Creation date
10/4/2006 9:26:22 PM
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Template:
Floodplain Documents
County
Jefferson
Community
Buffalo Creek
Title
Regional Storm Frequency Analysis
Date
4/22/1997
Prepared For
Jefferson County
Prepared By
David Diller
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />7 <br /> <br />Kinnikinnick, and Common Juniper. South facing slopes are sparsely vegetated, whereas the <br /> <br />north facing slopes are mostly covered by pine forest. Bedrock consists of Sphinx- Legault-Rock <br /> <br />outcrop (granitic) and shallow, somewhat excessively drained soils that formed in material <br /> <br />/ <br /> <br />weathered from granite (Soil Conservation Service (SCS), 1992). Soils contain 1-2% organics, <br /> <br />/"-- ".. <br /> <br />and the depth to bedrock ranges from 8 to (0 inch~CS, 1992). The organic litter layer on <br /> <br />unburned forest areas is approximately Saseflow in the area is negligible due to the <br /> <br />shallow soil depths and the impermeable nature of the bedrock. Most tributaries to Buffalo <br /> <br />Creek are ephemeral and resemble characteristics of sand washes. <br /> <br />/ <br /> <br />Hydrophobic Soils <br /> <br />During a forest fire, variable local fire temperatures will determine the severity of burned <br /> <br />vegetation and organic litter on the ground surface. When the organic matter is burned, it is <br /> <br />believed to release gases and certain compounds which translate into the soil and create a water <br /> <br />repellent layer (Savage et al. 1972). Water repellency in soils is a result of the coating of <br /> <br />particles with organic substances which "reduce the affinity shown by the soil for water" <br /> <br />(DeBano et al., 1967). The organic substances responsible for water repellency are thought to be <br /> <br />long chain aliphatic hydrocarbons (Savage et al., 1972). The depth to which water repellency <br /> <br />exists is dependent on the temperature and duration that the fire existed at the soil surface. Water <br /> <br />repellency has been known to be destroyed at very high temperatures that may occur at the soil <br /> <br />surface. DeBano et al. (1966) found that extremely high fire temperatures can be enough to <br /> <br />destroy non-wettability in the first few inches of soil, but below this depth, slightly lower <br /> <br />temperatures create an environment where non-wettability is not destroyed but intensified. <br />
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