Hidrológiai Közlöny 1971 (51. évfolyam)

1. szám - Valló Sándor: Összefüggés a felszíni vizek minősége és a hidrológiai viszonyok között

16 Hidrológiai Közlöny 1971. 1. sz. Special Conference Number, Szebellédy, L. d) Suitable intake designs may bevond aeration, and mixing further improve the quality of raw water. The intake site should be selected with due allowanee to the shape of the reservoir, the prevailing wind direction, the biological productivity of the reservoir and the geology of the environment. Withdrawal from several depths is essential, to permit the selection of the best-quality water layer as indicated by water analyses. Intakes at several points may be indicated for major reservoirs. Where reservoirs are filled artificially from a river, diversions should be made in accordance with quahty conditions in the latter. No practical realization of the above principles is possible, unless research is conducted systematically and experiences gained during experiments and the operation of similar installations are utilized. IV. Conclusions In view of the present state of research and the complex approach to water management interests, the desirable trends of further investigations may be summarized as follows: 1. In the interest of pollution control attention should be focussed on preventive measures. 2. In the interest of eutrophication control research should be centered on the third stage of treatment, the disposal of biologically treated wastes in fishponds, in t he soil and by irrigation and the problem should be regarded as one of importance to the entire national economy, rather than to water technology or comprehensive water management only. 3. Theoretical research, experiments, the evaluation of operational experience and economics should be intensified for improving the quality and usefulness of polluted and eutrophicated waters. The main problems in these field seem to be a) the improvement of oxygen supply by aeration, b) control of thermal stratification by mixing and circulation, c) recognizing the increased importance of hydraulics for the improved design of inlets, and diversions. 4. Comprehensive, sophisticated methods should be applied for advancing investigation into the relationships between components of water quahty and hydrological conditions in the broader sense, devoting increased attention to problems associated with hvdrobiology. Site of the Conference: The Hungárián Academy of Sciences