1. Lecture 19 - 1 ERS 482/682 (Fall 2002) Urbanization ERS 482/682 Small Watershed Hydrology

2. Lecture 19 - 2 ERS 482/682 (Fall 2002) Figure 11-14: Dunne and Leopold (1978)

3. Lecture 19 - 3 ERS 482/682 (Fall 2002) Effects on hydrology Aurora Reservoir

4. Lecture 19 - 4 ERS 482/682 (Fall 2002)

5. Lecture 19 - 5 ERS 482/682 (Fall 2002)

6. Lecture 19 - 6 ERS 482/682 (Fall 2002) Effects on hydrology If storm size stays same (e.g., 2-year storm with 1 inch rainfall) –More runoff –Higher peak flows –More perennial flow

7. Lecture 19 - 7 ERS 482/682 (Fall 2002) Impacts on receiving waters Increased channel erosion –Reduced habitat –Reduced wetlands Increased flooding downstream

8. Lecture 19 - 8 ERS 482/682 (Fall 2002) Impacts on water quality Increased loading of –Suspended solids –Nutrients –Heavy metals –Fecal bacteria

9. Lecture 19 - 9 ERS 482/682 (Fall 2002) “Remedies” Best Management Practices (BMPs) –Practices that are a combination of management, cultural, and structural approaches that most effectively and economically control urbanization effects without disturbing the quality of the environment

10. Lecture 19 - 10 ERS 482/682 (Fall 2002) “Remedies” Best Management Practices (BMPs) Source: http://www.cwp.org

11. Lecture 19 - 11 ERS 482/682 (Fall 2002) “Remedies” Best Management Practices (BMPs) Source: http://www.cwp.org

12. Lecture 19 - 12 ERS 482/682 (Fall 2002) “Remedies” Best Management Practices (BMPs) Figure 11-17: Dunne and Leopold (1978)

13. Lecture 19 - 13 ERS 482/682 (Fall 2002) “Remedies” Best Management Practices (BMPs) Figure 11-22: Dunne and Leopold (1978)

14. Lecture 19 - 14 ERS 482/682 (Fall 2002) “Remedies” Best Management Practices (BMPs) Figure 11-19: Dunne and Leopold (1978)