1. Member, ASCE
2. Water Resour. Sys. Engr., Inst. for Water Resour., U.S. Army Corps of Engineers, CEWRC-IWR-P, Casey Build., 7701 Telegraph Rd., Alexandria, VA 22315-3868.
3. Asst. Prof., Dept. of Sys. Engrg., Univ. of Virginia, Charlottesville, VA 22903; corresponding author.
4. Res. Asst. Prof., Dept. of Sys. Engrg., Ctr. for Risk Mgmt. of Engrg. Sys., Univ. of Virginia, Charlottesville, VA.