Quick Resource: http://wrrc.arizona.edu/sites/wrrc.arizona.edu/files/Quick%20Resouce-%20SW%20Quantity%20%28final%29.pdf
Other resources:
Effects of urban development on floods http://wrrc.arizona.edu/sites/wrrc.arizona.edu/files/USGS_Effects%20of%20Urban%20Development%20on%20Floods.pdf
Example of urban flooding in the Southwest - past flood events in Pima County http://webcms.pima.gov/cms/one.aspx?portalId=169&pageId=60316.