1. P.E., Member, ASCE
2. Student Member, ASCE
3. Assoc. Prof., Dept. of Civ. and Envir. Engrg., Utah State Univ., Logan, UT 84322-4110.
4. Lect., Facu. of Engrg., Universitas Riau, Pekanbaru, Indonesia; formerly, Res. Asst., Dept. of Civ. and Envir. Engrg., Utah State Univ., Logan, UT.