Indus river?

Question

How does the Indus River impact its environment?

Answer 1

The Indus River {hindi : sindh} is the longest and most important river and often considered the life-line of Pakistan. It is the longest river and the third largest river, in terms of annual flow, in the Indian subcontinent. Originating in the Tibetan plateau in the vicinity of Lake Mansarovar, the river runs a course through Ladakh district of Jammu and Kashmir and Northern Areas, flowing through the North in a southerly direction along the entire length of the country, to merge into the Arabian Sea near Pakistan's port city Karachi. The total length of the river is 3,180 kilometres (1,976 miles). The river has a total drainage area exceeding 1,165,000 square kilometres (450,000 square miles).

Impact of ther river on it's environment :

The river's estimated annual flow stands at around 207 cubic kilometres. It is embanked by fertile alluvial soil promoting agriculture in the areas through which it flows. It irrigates 1000s of hectares of land in India alone.

The Indus is the most important supplier of water resources to the Punjab and Sindh plains - it forms the backbone of agriculture and food production in Pakistan. The river is especially critical as rainfall is meagre in the lower Indus valley. Irrigation canals were first built by the people of the Indus valley civilization, and later by the engineers of the Kushan Empire and the Mughal Empire. Modern irrigation was introduced by the British East India Company in 1850 - the construction of modern canals accompanied with the restoration of old canals. The Guddu Barrage on the river  is 1,350 metres (4,450 ft) long - irrigating Sukkur, Jacobabad, Larkana and Kalat. The Sukkur Barrage serves over 20,000 square kilometres (5,000,000 acres).

The project, Indus Basin Project, consisted primarily of the construction of two main dams, the Mangla Dam built on the Jhelum River and the Tarbela Dam constructed on the Indus River, together with their subsidiary dams. The Pakistan Water and Power Development Authority undertook the construction of the Chashma-Jhelum link canal - linking the waters of the Indus and Jhelum rivers - extending water supplies to the regions of Bahawalpur and Multan. Pakistan constructed the Tarbela Dam near Rawalpindi - standing 2743 metres (9,000 ft) long and 143 metres (470 ft) high, with an 80 kilometre (50 mile) long reservoir. The Kotri Barrage is 915 metres (3,000 ft) long and provides additional supplies for Karachi. The Taunsa Barrage near Dera Ghazi Khan produces 100,000 kilowatts of electricity. The extensive linking of tributaries with the Indus has helped spread water resources to the valley of Peshawar, the Northwest Frontier Province. The extensive irrigation and dam projects provide the basis for Pakistan's large production of crops such as cotton, sugarcane and wheat. The dams also generate electricity for heavy industries and urban centres.

Beginning at the heights of the world with glaciers, the river feeds the ecosystem of temperate forests, plains and arid countryside. Together with the rivers Chenab, Ravi, Sutlej, Jhelum, Beas and the extinct Sarasvati River, the Indus forms the Sapta Sindhu ("Seven Rivers") delta in the Sindh province of Pakistan. It has 20 major tributaries.