1. Assistant Professor, School of Civil and Construction Engineering, Oregon State Univ., 220 Owen Hall, Corvallis, OR 97331-3212 (corresponding author).
2. Hydraulic Engineer, Ausenco-Vector, Calle Esquilache 371, San Isidro, Lima 27, Perú.
3. Graduate Research Assistant, School of Civil and Construction Engineering, Oregon State Univ., 220 Owen Hall, Corvallis, OR 97331.
4. Assistant Professor, Civil Engineering, Boise State Univ., 1910 University Dr., Boise, ID 83725-2060.