1. Asst. Civ. Engr., Santa Clara Water District, 5750 Almaden Expwy., San Jose, CA 95118-3686. E-mail: cindkao@scvwd.dst.ca.us
2. Prof., Dept. of Civ. and Envir. Engrg., Univ. of California at Berkeley, Berkeley, CA 94720-1710. E-mail: hunt@ce.berkeley.edu