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Conclusion These are very generalised illustrations of the difficult problems encoun- tered in river engineering and river regulation, when the decisive factors and temperature gradient are taken into account. Detailed explanations can only be applied to specific and individual cases and conditions and cannot be given here. The perception that mathematical formulae alone are an inadequate basis for the execution of river engineering works, was aptly expressed by the hydrologist Robert Weyrauch - namely, that for the carrying out of river engineering projects, "An especial gift for hydraulics, an exceptional feel for what is hydraulically pos- sible or impossible is necessary. This is only acquired with difficulty, and even the most experienced repeatedly suffer disappointments." The Movement of Temperature in Mass-Concrete Dam Walls [An article by Viktor Schauberger published in Die Wasserwirtschaft, the Austrian Journal of Hydrology, Vol. 35,1930, pp. 717-719.]53 The fact that increased attention is being given today (1930) to measurement of internal temperatures of large, mass-concrete dam-walls demonstrates the importance attached to these often high internal temperatures and their effect on the strength of the material, on shrinkage cracks and other struc- tural factors. Temperature surveys at various dams with inbuilt thermometers show that in concrete walls the temperature rises to about 22°C above the ambient temperature within a few weeks, due to the generation of curing heat54. In many dams adjustment to the mean ambient temperature takes place more rapidly than in others (Jogne Dam - 1.5 years, Arrow Rock Dam - 5 years). After this has occurred, and with a certain time-lag, internal temperatures 53The longer passages shown in italics in this section are taken from letters by Viktor Schauberger to the editor of Die Wasserwirtschaft, vol.7,1931, p.7 and vol.3,1931, p.47 respectively and have been included here for fuller elaboration. - Ed. 54Cast Concrete: Findings in Swiss Dam Construction (Erfahrungen beim Schweizerischen Talsperrenbau), Dipl Ing Ed Stadelmann; pub- lished by Hoch u Tiefbau AG, Zurich. - VS 55There appears to be no actual verb for the process of depositing sediment similar to the process of cavitation (cavitating), therefore the word sedimentating has been coined here. - Ed. 56An analogous process is the formation of scale (in boilers), although naturally the sedimentary action described above occurs substantially more slowly, since the large differences in tem- perature in the case of boiler-scale formation are not here present. - VS. 57Prof Dr Ing Thurnau: "Die Bewegung der Temperatur in der Sperrmauer der Waldecker Talsperre", Deutsche Wasserwirtschaft, vol 4, 1924. - VSPDF Image | The Water Wizard
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