Vízügyi Közlemények, 1966 (48. évfolyam)

4. füzet - Rövidebb közlemények és beszámolók

(44) c) supply to greenhouses and hot-bed gardening (above 50 to 70 Centigrades), d

) supply to medical- and covered baths (above 40 Centigrades), e

) supply to outdoor baths, swimming pools (above 35 Centigrades). On the 1st July, 1965 the number of wells in Hungary yielding thermal water warmer than 35 Centigrades was 242. Their location is shown in Fig. 7. The percentage distribution of wells according to utilization is shown in the diagram of Fig. 8. The detailed survey of temperature and heat demands of potential utilizations in different areas, accompanied by information on possible development forms the prerequisite for the preparation of the exploration and development plan of thermal water resources. The survey was made according to counties and thus county boundaries are also indicated in the figures. The number of existing thermal wells is grouped according counties and temperature. Present uses are also indicated. Geothermal and geologic conditions of development are given for different parts of various counties, and where possible, depth of occurrence, yield and temperature are predicted. Potential utilizations are also included and sites where utilizations serving a specific purpose and with a given temperature demand are listed. Thermal wells yielding water of the necessary temperature can be drilled over 35 to 40 percent of the area of the country. INVESTIGATION INTO THE STANDARD OF AGRICULTURAL WATERHOUSEHOLDING (Study on the arable lands of Békés county) By Dr. I. Oroszlány Engr. (For the Hungarian text see pp. 194) A study into the historical d evelcp

ment of agricultural prcduction and water esources management in agriculture revealed a close interrelation between the wo. For a closer study of this relation it was felt necessary to introduce a parameter permetting the numerical evaluation of the standard of waterhousehold in agriculture. This parameter was named by the author the waterhousehold coefficient and defined by the expression Qj Q ] max where Qj is the crop actually attained over a particular agricultural area ,and Qj

max is the crop attainable when all damages caused by water and draught can be prevented. Actual and maximum attainable crops show periodical fluctuations depending on farming methods applied. The effectiveness revealed by the above ratio is thus a relative one. If it is intended to compare waterhousehold standards in different periods, the denominator should represent the greatest possible crop attainable in the period using the most up to date farming methods. Different periods are rendered comparable thereby. The maximum attainable crop in a sequence of years in the absence of draught or excess water is estimated by determining first the difference between potential évapotranspiration of plants and natural water supply for individual months (e,). This difference, expressed in mm-s, is multiplied by the regression coefficient bi characterizing the relationship between precipitation in the particular period (month) and crop in the same year, i.e., H = (-eib,).