BOOK REVIEWS
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J. M. DE FORGES: Research on the Utilization of saline water for irrigation in Tunisia. Nature and Resources, Vol. VI, No. l, 1970. Unesco, Paris. The Research Centre for the Utilization of Saline Water for Irrigation (CRUESI) has recently completed its seven-year U N D P programme on the utilization of saline water for irrigation in Tunisia. The mean average salinity of the water used in various areas and with the crops studied ranged from 0.2 to 6 g/1 under annual rainfalls ranging from 90 to 420 ram. The crops investigated included artichokes, alfalfa, beans, water-melons, Sudan grass, maize and tomatoes. The yield of artichokes, for example, was maintained at 100 per cent with salinities up to 4 g/l, and the yield of tomatoes fell to 50 per cent with a salinity of slightly less than 3 g/l. CRUESI's activities showed that if the advice given in the published pamphlets is followed, crops can be raised with the saline waters considered, but with a calculable decrease in production. F.D.
Water Resources Research Catalog. New Edition. Prepared by Smithsonian Institution, and obtainable from Superintendent of Documents, Washington, D.C. $8.50. The Catalog lists 4501 United States research projects in hand or recently completed.
P. HERBST: Flood estimation for ungauged catchments. Tech. Rep. No. 46, Hydrological Research Division, Dept. of Water Affairs, Pretoria, South Africa, 1968. D. B. BREDENKAMP: A survey of rainfall anomalies in the Republic of South Africa. Tech. Rep. No. 48. Hydrological Research Division, Dept. of Water Affairs, Pretoria, South Africa. 1969. VEN TE CHOW : Study of watershed hydrology by the Watershed Experimentation System. Nature and Resources, Vol. VI, No. 1, 1970. Modern research in hydrology frequently resorts to sophisticated scientific instrumentation. One example described here is the Watershed Experimentation System (WES) which has been developed in the Hydraulic Engineering Laboratory of the Department of Civil Engineering, University of