Arthur C. Nelson, Raymond J. Burby and William J. Drummond, Journal of Urban Planning and Development, Vol. 117, No. 1 (March 1991), pp. 32-40. CURS Report No. 91-05. For information write to: American Society of Civil Engineers, 345 East 47th Street, New York, NY 10017-2398. Refer to Identification #0733-9488/91. 1990 Publications.