1. Jon Luevano Effects of urbanization on the hydrologic cycle

2. Urbanization • Growth and development of cities • Large population density • Highly industrialized • Comparing city to city • Size (area) • Population density • Percentage of urban coverage • Hydrological impacts

3. Key Hydrological Impacts • Urban runoff hydrology • River channelization • Climatic changes • Water quality • Snow melt

4. Urban Runoff Hydrology • Impermeable surfaces change surface runoff patterns • Lower percolation rates • Higher overland flow rates • Reduction in peak discharge time/size • Cherkauer (1975) • Rose and Peters (2001) • Problems • Potential for flooding • Pollution

6. River Channelization • Human intervention on flow body of water • Resource management • Navigation and resource/power production • Flood control • Controlling runoff paths • Increase discharge rates • Problems • Biological • Vast increase in stream flow • Simon and Senturk (1977)

8. Water Quality • Sources for pollution • Higher surface runoff • Higher concentrations of contaminants • Davis (2001) • Gromaire-Mertz (1999) • Focus • Pinpoint and reduce use of specific sources of contamination • Water treatment methods

9. Snow Melt • Surface water created from melting snow • Factors • Air temperature • Solar radiation at surface • Ferguson (1999) • Urban snow melt • Timing/intensity of melt • Semandi-Davis (1998) • Jones (1997)

10. Climatic Changes • Climatic factors control hydrologic cycle • Rural vs. Urban • Warmer temperatures • Heat island effect • Evaporation rates • Lowry (1967) • Precipitation rates • Atkinson (1979)

12. Concluding Remarks • Importance of urban water management • Keys • Control of urban runoff pathways and exposure • Limit contamination • Improve treatment processes • Increase knowledge and awareness

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