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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.

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

1. 1. Hydrology The science of water, its properties, distribution and circulation, both on the surface and underground.
2. 2. HydrologyWater flowsthrough oursite by avariety ofpathways
3. 3. Water BudgetsInputs = Outputs + StoragePrecipitation EvapotranspirationGroundwater discharge Groundwater rechargeSurface Flow Surface flow - Runoff- Streams- Tides
4. 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. 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. 6. Erosivity Index zone map and calculator http://ei.tamu.edu/index.html
7. 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. 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