1. Some Basic Hydrologic Concepts Weir are used to measure volume of water flowing past a point.

2. What Happens to Precipitation? Hydrologic cycle P = RO + ET + S, Where, P ≡ precipitation RO ≡ runoff ET ≡ evapotranspiration S ≡ storage

3. Components of Vaporization Chang, p. 169, Munich Germany

4. Evapotranspiration Loss of water from a given area during a specified time by evaporation from the soil surface and by transpiration from the plants. Supports plant life Reduces water yield

5. Runoff Provides Major Benefits RO = P – ET Moose Creek, Clearfield County, PA (WLH)

6. Where does runoff go to? RO = CI + SRO + SSF + BF, –where, CI ≡ channel interception SRO ≡ surface run off SSF ≡ subsurface flow BF ≡ base flow

7. Where does runoff go to? –CI ≡ channel interception Precipitation falling directly into channel Susquehanna River, Clearfield, PA, (WLH)

8. Where does runoff go to? –SRO ≡ surface runoff or overland flow Precipitation not infiltrating soil Sheet erosion of cropland resulting from surface runoff Source: http://www.agric.gov.ab.ca/agdex/500/72000003.html

9. Where does runoff go to? –SSF ≡ subsurface flow, or interflow Infiltrating precipitation intercepted by hardpan or bedrock before entering groundwater pool

10. Where does runoff go to? –BF ≡ base flow or ground water flow Precipitation entering water table

11. Research results come from experimental watersheds such as:

12. What We’ll Look At Erosion –Impacts of Roads Harvests Water flows –Storm events –Storage Water yield –Amount –Timing Montgemory Reservoir, Clearfield, PA, WLH