World Water Balance Symposium Reading, England July 15”23, 1970
Article first published online: 3 JUN 2011
©1970. American Geophysical Union. All Rights Reserved.
Eos, Transactions American Geophysical Union
Volume 51, Issue 10, pages 692–693, October 1970
How to Cite
1970), World Water Balance Symposium Reading, England July 15”23, 1970, Eos Trans. AGU, 51(10), 692–693, doi:10.1029/EO051i010p00692.(
- Issue published online: 3 JUN 2011
- Article first published online: 3 JUN 2011
- Cited By
The first International Symposium on World Water Balance, held at the University of Reading, England, July 15–23, 1970, demonstrated that the former, self-imposed boundaries of hydrology (something in between meteorology and oceanography) no longer exist. Meteorologists and oceanographers are now active in hydrology and vice versa; or all are active geophysicists as R. C. Sutcliff (U.K.) might prefer to have it.
In a paper given early in the symposium, A. A. Sokolov (USSR) pointed out that the long history of hydrology may be divided into four stages: an early prehistory stage (which continues into the present) in which man began to measure and to keep records of fluctuations in levels of lakes and rivers; a second stage, marked by the building of dams and other structures for runoff control, requiring the volumetric measurement of stream flow; a third stage, which seeks to obtain a worldwide, steady-state or ‘mean value’ balance in which evaporation is calculated as the difference between precipitation and runoff; and finally, a fourth stage in which the dynamic processes of water balance are studied as parts of a whole, and in which the related heat and energy balances play an essential part. In the closing session, H. L. Penman (U.K.), in semi-jest, summarized the conference with the steady-state equation, dv/dt = 0. The main emphasis of the symposium was on Sokolov's third stage given above, but there were also important contributions to various parts of the fourth stage, and in particular with regard to the process of evapotranspiration.