1. Dep. of Environmental, Water and Agricultural Engineering Faculty of Civil and Environ. Eng.; The Technion-Israel Inst. of Technology; Haifa Israel 32000
2. Agriculture and Agri-Food Canada; Semiarid Prairie Agric. Research Centre; Box 1030 Gate 4 Airport Rd. Swift Current SK Canada S9H 5E3
3. Institute of Marine Sciences Earth and Marine Science; Building Rm C308 Univ. of California-Santa Cruz 1156 High St. Santa Cruz CA 95064