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Hydrometry (from ancient Greek ὕδωρ hýdōr 'water', μέτρον métron 'measure') is called the quantitative recording of the water cycle. Hydrometry collects data from surface water , groundwater and precipitation , evaluates it and displays it.

Only the uninterrupted observation of the water level and runoff (in the case of surface water) allows long-term changes to be recognized and the probability of major floods to be determined. The water level and runoff are measured at so-called levels . From this, with the help of statistics, annualities are determined, which form the characteristic values ​​of the respective water body .

The following parameters are usually recorded:

  • Precipitation: volume per time, volume in mm, where 1 mm = 1 l / m 2
  • Running water: height of the water level, level, as a kote in meters above sea level. The associated discharge is determined via a level-discharge relationship, as volume per time, m 3 / s
  • Groundwater: Height of the water level, level as a kote in meters above sea level

Depending on requirements, additional parameters such as temperature, conductivity, pH value and more are collected.

Today, the data is usually recorded with electronic / electromechanical sensors and stored and processed in a data logger .

By using modern means of communication, the measured values ​​can be transmitted quickly and made available to the general public.

Possible applications of the data:


  • Gerd Morgenschweis: Hydrometry. Theory and practice of flow measurement in open channels. Springer, Berlin 2010, ISBN 978-3-642-05389-4