1. Principal Hydrologist, Planning and Development Division, Pima County Regional Flood Control District, 97 East Congress, Tucson, AZ 85701 (corresponding author).
2. Chief Hydrologist, Planning and Development Division, Pima County Regional Flood Control District, 97 East Congress, Tucson, AZ 85701.
3. Civil Engineering Assistant, Planning and Development Division, Pima County Regional Flood Control District, 97 East Congress, Tucson, AZ 85701.