1. Hydraulic Engineer, U.S. Dept. of the Interior, Hydraulic Investigations and Laboratory Services Group, Bureau of Reclamation, Denver, CO. E-mail: twahl@do.usbr.gov
2. Hydraulic Engineer, U.S. Dept. of the Interior, Hydraulic Investigations and Laboratory Services Group, Bureau of Reclamation, Denver, CO. E-mail: kfrizell@do.usbr.gov
3. Civil Engineer, U.S. Dept. of the Interior, Waterways and Concrete Dams Group, Bureau of Reclamation, Denver, CO. E-mail: bcohen@do.usbr.gov