1. Member, ASCE
2. Sr. Envir. Engr., Virginia Department of Environmental Quality, 629 E. Main St., Richmond, VA 23219.
3. Assoc. Prof., Dept. of Civ. and Envir. Engrg., 418 Durham Hall, Virginia Polytechnic Inst. and State Univ., Blacksburg, VA 24061-0246 (corresponding author). E-mail: nlove@vt.edu