Hidrológiai Közlöny 1985 (65. évfolyam)

5. szám - Liptai Edit–Sajgó Zsolt–dr. Szilágyi Gábor: A talajvízháztartás módosulásai változatos terület beépítésekor

Liptai E.—Sajgó Zs.—dr. Szilágyi G.: A talajvízházta rtás Hidrológiai Közlöny 1985. 5. sz. 319 10.Mcip-8.MlSn, KÖRTÉLYESALJA, DOMBOLDAL 1976 1977 1978 1979 1980 1981 1982 < / \ J I 24.KOT csp=B.3f!,53m N CSIGA PATAK, VÖLGYSUVÁRGÖ ELLENŐRZŐ KUT ^ K-5 HUT csp 'B

326,92m 8. ábra. Talajvízállás idősorol1976—82 Fig. 8. Time-series of groundwater levels 1976—82 Environmental requirements could be also taken care of under construction. Consequently, the location was extremely diversified from the point of view of morphology and hydrology. This has turned out technically as disadvantageous. The new plant was built along a middle-section of the brook called Lófőtető, at a point where the confluence with four small tributaries existed. This inhomogeneous terrain

— unfavourable for industry — was rearranged in such a way that buildings, servicing units (railway, road) all had been placed on their proper site according to the planned technology. Rased on a map of isolines constructed from data of 38 observation wells and probes executed in the year of 1980, the changes in hydrologies! behaviour could be detected. Infiltration was reduced due to massive paving. Reduced groundwater levels were produced bv draining off arriving waters from Miocene layers by artificial drains, by a new river-bed with a deeper bottom of the brook Lófőtető. Increase of groundwater level was induced by a large and thick fillup working succesfully against evaporation. Over the area of the plant a continuous rise in the groundwater level could be observed (Wells 9 and 20), the tendency of which could be characterized by investigating the data. Its amplitude varied from 0,1 to 0,5 m as a function of annual precipitation and the thickness of the fillup. As a general experience one may conclude the following: in areas where complex geological and hydrological conditions prevail the establishment and regular use of an observation network — 3 to 5 years in advance of construction — is extremely useful in order to obtain reliable hydrological information for operation and forecasting. Levelling of the ground and land-drainage may change substantially the magnitude of some elements of the waterhousehold and — consequently — the groundwater levels after construction.