Vízügyi Közlemények, 1935 (17. évfolyam)
Kivonatok, mellékletek - Kivonat a 3. számhoz
32 V II . SOME UNSETTLED QUESTIONS OF IRRIGATION IN HUNGARY. By A. TRÜMMER. (Pages 461—482.) Of late years questions relating to the irrigation of the Hungarian Great Plains have much been disputed both by engineers and farmers. The chief questions under discussion are: la., whether irrigation is necessary under the climatic conditions prevailing in Hungary ; Ib., whether economic and population conditions necessitate irrigation ; II., how many areas are reasonably to be irrigated ; III., how much land can be irrigated with the available stock of water. The writer treats of these questions. Ia. He compares the rainfall conditions of the Great Plains with the amount of rain stated by different authors (Krüger, Zunker, Philipp, Wohltmann, Mayer) as necessary to vegetable life, and comes to the conclusion that in this country there is a deficiency in rain of 50—220 mm per annum for the different crops. The soil moreover has in general small capacity for storing water, because the mould-layer is shallow, and therefore there is no security of producing crops in a uniform quantity. Ib. Examining the economic and population conditions, the writer concludes that farming with irrigation is not absolutely necessary at present, but within a few decades it will certainly be needed. He therefore advises that preparations be made. II. As to extent of areas to be irrigated, he states that within the next few decades in round number 300,000 hectares will have to be provided with irrigation. III. As for the area that could be irrigated, the writer deals with the water requirement of irrigation and the discharge of rivers. He states the water supply required annually for one hectare at 4500 cu metres, or 0-43 litre per second per hectare, taken as an ideal constant supply during 123 days in the months of MayAugust. Considering this amount of supply and the discharge of the rivers in Hungary, he thinks that, without any forced storage, 600,000 hectares can be irrigated, of which 300—300,000 hectares fall to the basin of the Danube and the Tisza, respectively. But this area can be doubled, provided that the supply of water is carried out economically and the storage more forced. V. ICY FLOOD AT MOHÁCS IN FEBRUARY 1935. By D. IHRIG. (Pages 483—495.) Between the 19 , h and 21 s of February 1935 an ice-barrier 19 to 20 kilometres long was formed in the Mohács—Bezdán reach of the Danube, which is divided into two parts by the Hungarian —Yugoslavian frontier. The lower end of the barrier was at the peak of the island upstream from Batina (Yugoslavia), and its upper end reached as far as Mohács (Hungary), as shown in figure 3.
