The level of Nile River have been measured for more than five thousand years, with records stretching over 13 centuries. The Nilometer, in various forms, is a good example of historid water measurerment.
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While Nilometer at Roda Island (shown above) is an important long-term record
of the water, it has turned out to have unanticipated uses.
THM: If you can measure it accurately and regularly, do:
you never know what it uses will be.
Data from the Nile River have spurred the development of aspects of mathematics (Brownian motion and Gaussian noise) along with a field of statistics concerned with the behavior of long memory time series.
This nilometer gave a remarkable hydrological time series of
minimum and maximum water levels for the Nile River from 622 AD to
1922 AD. Due to first missing observation in the annual minima about 1285,
the continuous records to analyze, the longest one (662 years) is
shown shown above.
For example, the frequency of El Ninos in the 1990s has been greatly
exceeded in the past. In fact, the period from 700 to 1000 AD was a very
active time for El Ninos, making our most recent decade or two of high
El Nino frequency look comparatively mild.
http://www.waterhistory.org/histories/cairo/
<http://www.physics.ohio-state.edu/~wilkins/energy/Resources/Lectures/nile-eg.html>
[Monday, 23-Apr-2018 09:44:10 EDT]
Edited by: wilkins@mps.ohio-state.edu on
Saturday, 10-Sep-2011 14:53:28 EDT