Vízügyi Közlemények, 1966 (48. évfolyam)

4. füzet - Rövidebb közlemények és beszámolók

(79) canals), mixing at a central plant may be practicable, where soil and the stabilizing agent are mixed in a positive-action mixer and placed alter mixing. A cost study of the family of machines used lor stabilization in Hungary revealed that cost-and output figures are greatly influenced by the size of projects. CURRENT PROBLEMS IN PLAIN-LAND MELIORATION By G. Kienitz, Civ. Engr (For the Hungarian text see pp. 30cS) Plains occupy two-thirds of Hungary's area and hydrological problems of plains assume thus increased significance. The importance and methods of evaluation of these problems are viewed differently in different branches of science. Actually the same ramified problem is tackled, which is basically hydrological, but in its effects agricultural yet general economic in character. Inclusive problems of this nature should be solved by the uniform approach of plain-land melioration. The approach should be founded on the factual knowledge of phenomena and their effects, and this calls for research activity. A program is given for this research, including a

) factors associated with the origin and drainage of surface runoff, b) interrelations between surface runoff and agriculture, and general effects thereof on national economy, c

) investment, maintenance and operating problems of plain-land melioration, and d) utilization of research results. In Chapter 1 the four problems listed above are detailed, while in Chapter 2 a brief description of current research is given in connection with individual problems. Investigations are based on data on six major representative experimental areas compiled briefly in Table I. The same of the area, the commencing date of observations, the magnitude of the experimental area in sq. kilometres, the type of soil and the brief description of research institution engaged in research are given in the table. Besides the six major representative experimental areas research is extended to the entire plain region of the country by the regional agencies of national water management and both hydraulic and agricultural services become involved. The following tools are used in research : a) An observation network extending to all sub-catchments of the country and monitoring all factors affecting the development of surface runoff is being developed. Attempts are made at determining runoff volumes lor individual water systems separately. Inundations by surface runoff, damages caused thereby are surveyed and costs of melioration works are collected for individual water systems. b) Experimental sub-catchments representative for individual regions have been established to study the origin, runoff and effects of surface waters. c) Data contributing to the aforesaid research are collected at agricultural research institutions, e. g. on runoff from experimental plots, damages caused by excess water. d) Experiments with artificial inundation are conducted, since observations on natural surface runoff yield but slowly information on individual problems. BRIEF PUBLICATIONS AMI REPORTS 1. Dr. Lászlóffy, W., Civ. Engr.: The XXIst International Navigation Congress (For the Hungarian text see pp. 395) A report is given on the activities of the congress held in Stockholm, from the 27. June to 3. July, 1965. In Chapter 1 a general review, in Chapter 2. a detailed description is given on special sessions. Special attention is devoted to Subject L, Inland Navigation, topics dealt with and discussions presented are detailed. In the commentary conclusions are drawn and suggestions are made for Hungarian navigation. (These are condensed in Chapter 4.) 2. Dr. Zrínyi, J. Jurist: International post-graduate course on hydrology (For the Hungarian text see pp. 403)