Water is always on the move – it is in circulation. In contrast to mineral resources it is not used up but it can be used numerously. The amount of water on the earth and in the aerosphere is estimated at 1,383,844,700 km³. The most part of the water (97.591 %) is in the oceans, the inland seas and the salt lakes. It is salt water. Only 2.408 % is fresh water. The biggest part of it (78 %) is stored in the polar region and the glaciers. The remaining 22 % of fresh water is divided into surface water, ground water, ground humidity and water in the biomass.

Read more … Hydrological Cycle

The components of the hydrologic balance, precipitation, discharge and evaporation, interact with each other. The thermal seasons (summer and winter) as well as the hygrical seasons (dry season and rainy season) influence their size. They varies in every area. The interactions of precipitation, runoff and evaporation are examined on the basis of the analysis of the hydrologic balance of an area. Except for the natural influences

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To explore the hydrological cycle measurements of air temperature, relative humidity, duration of sunshine, wind speed and other parameters with weather stations at many different locations are made.

Read more … Exploration of the Hydrological Cycle