National Conf on Irrigation and Drainage Engineering, Date: JUL 22-26, 1991, Location: HONOLULU, HI, Sponsors: AMER SOC CIVIL ENGINEERS, IRRIGAT & DRAINAGE DIV, AMER SOC CIVIL ENGINEERS, HAWAII SECT, AMER SOC AGR ENGINEERS, AMER SOC AGRON, SOIL SCI SOC AMER, CROP SCI SOC AMER, IRRIGAT ASSOC, US COMM IRRIGAT & DRAINAGE