Brian Smith of FHWA   Chicago HS for Agricultural Sciences Shadow Day 02-08-12
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Brian Smith of FHWA Chicago HS for Agricultural Sciences Shadow Day 02-08-12

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Presentation by Brian Smith of FHWA on Careers in Transportation - Chicago HS for Agricultural Sciences Shadow Day 02-08-12.

Presentation by Brian Smith of FHWA on Careers in Transportation - Chicago HS for Agricultural Sciences Shadow Day 02-08-12.

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Brian Smith of FHWA Chicago HS for Agricultural Sciences Shadow Day 02-08-12 Presentation Transcript

  • 1. Hydrology The science of water, its properties, distribution and circulation, both on the surface and underground.
  • 2. HydrologyWater flowsthrough oursite by avariety ofpathways
  • 3. Water BudgetsInputs = Outputs + StoragePrecipitation EvapotranspirationGroundwater discharge Groundwater rechargeSurface Flow Surface flow - Runoff- Streams- Tides
  • 4. Seasonal Variability Average Monthly Precipitation 6 5 4Inches 3 2 1 0 1 2 3 4 5 6 7 8 9 10 11 12 MONTH http://www.sercc.com/climateinfo/historical/historical.html
  • 5. A = R * K * LS * C * PWhere A = estimated average soil loss in tons per acre per year R = rainfall-runoff erosivity factor K = soil erodibility factor L = slope length factor S = slope steepness factor C = cover-management factor P = support practice factor
  • 6. Erosivity Index zone map and calculator http://ei.tamu.edu/index.html
  • 7. When all factors other than rainfall were held constant, the soil loss is directly proportional to the total kinetic energy of the storm event times its maximum 30- minute intensity.This factor, Rainfall/Runoff Factor (R), has been called the Erosion Index (EI) factor.
  • 8. Erosivity DistributionJan-Mar Apr-Jun July- Sept Oct-Dec cumulative 5.79 38.64 76.16 21 141.59 8.77 41.09 71.98 21 142.84 10 46.89 82.04 26.08 165.01 23.67 60.73 73.85 36.67 194.92 July-Sept - High Risk Apr-Jun – moderate risk