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http://seamless.usgs.gov/. http://nhd.usgs.gov/. Terrain Preprocessing (Arc Hydro). Surface Analysis (Spatial Analyst). Terrain Analysis (TauDEM). Terrain Preprocessing (Arc Hydro). Problems. Fire Snowmelt Large Rainstorms.

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  1. http://seamless.usgs.gov/ http://nhd.usgs.gov/

  2. Terrain Preprocessing (Arc Hydro) Surface Analysis (Spatial Analyst)

  3. Terrain Analysis (TauDEM) Terrain Preprocessing (Arc Hydro)

  4. Problems • Fire • Snowmelt • Large Rainstorms

  5. http://www.utahfireinfo.gov/firephotos/index.htm

  6. Roads

  7. Roads Sediment is the number one pollutant in U.S. waterways.

  8. Roads in Farmington Canyon

  9. Past Debris Flows Sources: Http://www.geohazards.cr.usgs.gov/factsheets/html_files/debrisflow/fs176.97.html Http:/www.ugs.state.ut.us/online/pi-70/debrisflow.htm

  10. PSIAC Method Pacific Southwest Inter Agency Committee (1968) Annual Yield = .0833 e ^ (.0359 * FR) FR = Sediment Rating Factor = sum of (9) different factors.

  11. MUSLE Equation Ys=a*[Q*qp]β*K*LS*CP*S

  12. Ys – Total Tons per Event Q – Storm Runoff (acre-ft) qp – peak runoff (cfs)

  13. a,β – storm factors Typical Rain Storm a=95 β=.56 Snow Melt Flood a=120 β=.3

  14. K – Soil Erodibility Factor LS – Slope Factor (length and steepness) CP – Cover and Management Practice Factor SDR – Sediment Delivery Ratio

  15. gs=a[Q*qp]^b*K*LS*CP*SDR Q = Storm Runoff (acre-ft) qp= Peak runoff (cfs) a = 95 b= .56

  16. Q=CIA Q=Runoff C=Runoff Coefficient I=Intensity of rainfall (assume 1 in/hr) A=Area of Catchment

  17. C=.17

  18. C=.3

  19. q= Accumulation of Catchment Accumulation of Basin * Peak Flow

  20. Accumulation of Each Catchment

  21. Peak Flow For Farmington Canyon

  22. K Factor

  23. K Factor K factor is soil erodibility factor which represents both susceptibility of soil to erosion and the rate of runoff, as measured under the standard unit plot condition. Soils high in clay have low K values, about 0.05 to 0.15, because they resistant to detachment. Coarse textured soils, such as sandy soils, have low K values, about 0.05 to 0.2, because of low runoff even though these soils are easily detached. Medium textured soils, such as the silt loam soils, have a moderate K values, about 0.25 to 0.4, because they are moderately susceptible to detachment and they produce moderate runoff. Soils having a high silt content are most erodible of all soils. They are easily detached; tend to crust and produce high rates of runoff. Values of K for these soils tend to be greater than 0.4. http://www.iwr.msu.edu/rusle/kfactor.htm

  24. SSURGO No Data Found

  25. STATSGO No Data Found

  26. Soil Distribution

  27. Soil Distribution (cont.)

  28. Soil Distribution (cont.)

  29. Soil Distribution (cont.)

  30. Calculated K Factor

  31. The Value of Cp

  32. http://landcover.usgs.gov/classes.asp

  33. http://seamless.usgs.gov/ Spatial Analyst (reclassify)

  34. Spatial Annalist (Zonal Statistics) Exporting the Data

  35. http://landcover.usgs.gov/classes.asp

  36. http://moose.cee.usu.edu/giswr/archive99/termp/grams/tp.html

  37. Sample of Excel Data

  38. Canyon Vegetation

  39. Wattles and sediment diversion and filtration techniques

  40. Vegetation in Farmington Canyon

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