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[7] The sediment yield of a river is the quantity of sand per unit area within a watershed that is removed over a period of time. [11] The monitoring of the sediment yield of a river is important for ecologists to understand the health of its ecosystems, the rate of erosion of the river's environment, and the effects of human activity. [11]
Water pollution occurs when water bodies, such as rivers, lakes and oceans are contaminated with harmful substances. These substances degrade the water quality and are toxic to humans as consumers and to the environment. [7] The contamination in a river can come from a point source or non-point source pollution. [8]
Rivers get their alluvium from erosion, which carves rock into canyons and valleys. Rivers have sustained human and animal life for millennia, including the first human civilizations. The organisms that live around or in a river such as fish, aquatic plants, and insects have different roles, including processing organic matter and predation.
The "flow regime" of a river or stream includes the general patterns of discharge over annual or decadal time scales, and may capture seasonal changes in flow. [7] [8] While water flow is strongly determined by slope, flowing waters can alter the general shape or direction of the stream bed, a characteristic also known as geomorphology. The ...
As per the classification of Food and Agriculture Organization, the rivers systems are combined into 20 river units, which includes 14 major rivers systems and 99 smaller river basins grouped into six river units. The Ganges-Brahmaputra-Meghna basin is the largest, which covers 34% of the land area and contributes to nearly 59% of the available ...
There are twelve rivers which are classified as major rivers, with the total catchment area exceeding 2,528,000 km 2 (976,000 sq mi). [28] All major rivers of India originate from one of the three main watersheds: [28] The Himalaya and the Karakoram ranges; Vindhya and Satpura range in central India; Sahyadri or Western Ghats in western India
The Peninsular River System's major rivers are the following: [1] Mahanadi River; Godavari River; Krishna River; Kaveri (or Cauvery) Narmada River; Tapi River (or Tapti) The rivers mainly drain in the rural area of India. The rivers have both religious and cultural significance to Indian people. The Peninsular Rivers are mostly fed by the rainfall.
A stone near Crissolo, Italy, is inscribed, "Here is born the Po".. The United States Geological Survey (USGS) states that a river's "length may be considered to be the distance from the mouth to the most distant headwater source (irrespective of stream name), or from the mouth to the headwaters of the stream commonly known as the source stream".