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The Pakistan Water & Power Development Authority (Urdu: واٹر اینڈ پاور ڈویلپمنٹ اتھارٹی), colloquially known as WAPDA, is a Pakistani government-owned public utility agency maintaining hydropower and water in Pakistan, although it does not manage thermal power plants. WAPDA includes Tarbela and Mangla dams among its ...
Many different systems are used in limnology to number waterbodies such as lakes, rivers and streams, ranging from basic index numbers representing their location in the river system, such as serial numbers for the major catchment areas of the rivers, or numbers indicating their hierarchical position in the system.
The Trophic State Index (TSI) is a classification system designed to rate water bodies based on the amount of biological productivity they sustain. [1] Although the term "trophic index" is commonly applied to lakes, any surface water body may be indexed. The TSI of a water body is rated on a scale from zero to one hundred. [1]
Biological quality (fish, benthic invertebrates, aquatic flora) Hydromorphological quality such as river bank structure, river continuity or substrate of the river bed; Physical-chemical quality such as temperature, oxygenation and nutrient conditions; Chemical quality that refers to environmental quality standards for river basin specific ...
Infographic explaining the hierarchy of the United States hydrologic unit system. Originally a four-tier system divided into regions, sub-regions, accounting units, and cataloging units, each unit was assigned a unique Hydrologic Unit Code (HUC). As first implemented the system had 21 regions, 221 subregions, 378 accounting units, and 2,264 ...
An example of a water distribution system: a pumping station, a water tower, water mains, fire hydrants, and service lines [1] [2]. A water distribution system is a part of water supply network with components that carry potable water from a centralized treatment plant or wells to consumers to satisfy residential, commercial, industrial and fire fighting requirements.
Water quality laws govern the protection of water resources for human health and the environment. Water quality laws are legal standards or requirements governing water quality, that is, the concentrations of water pollutants in some regulated volume of water. Such standards are generally expressed as levels of a specific water pollutants ...
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