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CE 513

CE 513. Erosion in the Fall Creek Watershed. Rick Faber. Erosion in the Fall Creek Watershed following the Clark Fire: Implications for the Hehe Timbersale. Clark Fire destroyed 5000 acres of undisturbed forest land in late 2003

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CE 513

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  1. CE 513

  2. Erosion in the Fall Creek Watershed Rick Faber

  3. Erosion in the Fall Creek Watershed following the Clark Fire:Implications for the Hehe Timbersale • Clark Fire destroyed 5000 acres of undisturbed forest land in late 2003 • Fall Creek is home to genetically diverse population of anadromous fish • Current proposals are for a 2500 acre timber sale in the neighboring Hehe Creek basin.

  4. A is soil loss (tons/acre/year) R is the rainfall/runoff erosivity factor K is the soil erodibility factor (tons/acre/year) L is the slope length factor S is the slope steepness factor C is the cover management factor P is the support practice factor The universal soil loss equation is:A = R • K • L • S • C • P

  5. Isoerodent Map of Oregon R = 50

  6. K-factor from STATSGO soil coverage from the USDA.

  7. L & S: Length & Steepness Now combined and expressed as a single factor. (Moore and Burch 1986) ArcHydro Spatial Analyst

  8. C-Factor LARSE DATA

  9. C-Factor Rasters

  10. Calculate the Erosion

  11. Soil Erosion

  12. Mean Soil Loss for Fall Creek Watershed The loss of one inch of soil due to erosion is equivalent to 150 tons of soil per acre.

  13. Limitations • Sedimentation vs erosion • Truncate the Flow accumulation grid for LS factor • Land cover & time • Systematic error?

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