Flooding can reduce plants and changes in soils cause more run off and flooding.
What areas are prone to Flooding?
For Yavapai County, see this Flood Hazard Mapping.
For Maricopa County, see this Floodplain and Elevation Certificate Viewer
Other flood resources
Hydrological Processes in Riparian Areas - A University of Arizona Riparian Areas chapter
National Weather Services - Flooding in Arizona
Arizona State University article on Impact on Flooding in a Sonoran Stream