By Malin Falkenmark, Tom Chapman
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Additional resources for Comparative Hydrology: An Ecological Approach to Land and Water Resources
For further discussion, see Chapter 2. The aquifer types may also be quite different. The depth to the water-table is a vital factor for accessibility of water in wells, and may vary considerably between humid and arid conditions. In systems with a short turnover time (see Chapter 2), this depth may vary seasonally. The general pattern of groundwater movement may differ between different geological settings. The outflow area may have very different characteristics in different environments: temperate wetlands, chotts, playas, oases, coastal springs etc.
Through this connection, land use should be seen as an inherent part of the description of the hydrological cycle. Degradation of life support systems. Current literature on the human environment indicates that the most pressing ecological problems of the present world are related to land degradation, caused by reduction or total exhaustion of the vegetation cover, which would otherwise provide shelter from erosion due to heavy rain, or by mismanagement of irrigation projects, causing waterlogging or salinization of previously productive soils.
More detailed information is necessary for adequate design of various structures. Other types of water-related information may be needed in the construction phase. Finally, for the operation of a water resources structure, there may be a need for continuous information, including forecasting. The present tendency to degrade hydrological networks, referred to earlier, indicates a poor understanding of the fundamental importance of a reliable database on the water resources available in an area, for successful management of these resources.