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Freshwater accounts for only 2. The remaining unfrozen freshwater is mainly found as groundwaterwith only a small fraction present above ground or in the air. Depending on the local conditions, precipitation may feed rivers and lakes, replenish groundwateror return to the air by evaporation.
But many are shrinking as a result of climate change. The largest river basins include the Amazon and Congo Zaire basins.
River flows can vary greatly from one season to the next and from one climatic region to another. Because lakes store large amounts of water, they can reduce seasonal differences in how much water flows in rivers and streams. Many of them have been destroyed, but the remaining wetlands can still play an important role in preventing floods and promoting river flows.
Generally of high quality, groundwater is being withdrawn mostly to supply drinking water and support farming in dry climates.
The resource is considered renewable as long as groundwater is not withdrawn faster than nature can replenish it, but in many dry regions the groundwater does not renew itself or only very slowly.
Few countries measure the quality of groundwater or the rate at which it is being exploited. This makes it difficult to manage.33 WATER-RESOURCES SITUATION IN PAKISTAN: CHALLENGES AND FUTURE STRATEGIES Muhammad Akram Kahlown* and Abdul Majeed ABSTRACT akistan, once a water-surplus country, is.
Groundwater and the water from dams (made on rivers/streams), lakes and river themselves are the major freshwater resources in Pakistan. Due to the specific geological setting(Sedimentary) Pakistan has plenty of groundwater resources but they are at great risk due to over pumping of the ground water.
Overview of water resources in Pakistan Engineer Abdul Majid Kazi The total land area of Pakistan is approximately , square miles or 88 million hectares of land, of which approximately 20 million heaters are used for agriculture purposes.
Report No. PK Pakistan Country Water Resources Assistance Strategy Water Economy: Running Dry November 14, South Asia Region Agriculture and Rural Development Unit. Project: US – Pakistan Science and Technology Exchange in Water Resources: Leaders: Verne R.
Geological Survey (USGS) and the Pakistan Ministry of Science and Technology (MoST) and other Pakistani organizations involved in water resources assessment and management are engaged in . Report No. PK Pakistan Country Water Resources Assistance Strategy Water Economy: Running Dry November 14, South Asia Region Agriculture and Rural Development Unit.