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When the city harms its own water resources When the city harms its own water resources
In areas where surface water is not readily available (located far from areas of need), groundwater is the primary water source. Groundwater aquifers supply an estimated 20% of the global population living in arid and semi-arid regions. Despite their widespread presence, groundwater aquifers in arid areas receive only limited or seasonal recharge, making such aquifers susceptible to rapid depletion. The Northern Sahara Basin Aquifer, for example,...
01 Oct 2009 - by Philippe Rekacewicz
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Urban growth rate in Africa Urban growth rate in Africa
Africa’s urban centres are currently growing at an annual rate that is the fastest compared to other regions. The urban expansion is expected to continue, with cities like Abuja and Ouagadougou expecting very high growth in the next decade, while Cairo, Africa’s largest city, is projected to see a comparatively lower growth rate.
27 Feb 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Water supply and demand in Nairobi Water supply and demand in Nairobi
The bulk of water supply for Nairobi comes from Thika, Sasumua and Ruiru Dams, as well as the Kikuyu Springs. Over time water supply for the city has failed to meet demand. The current estimated water demand for Nairobi is 650 000 m3/day compared to the production of 482 940 m3/day (WRMA 2010). The difference between production and demand has been widening over time due to population growth, inadequacy of the carrying capacity of the distributio...
18 Mar 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Urban population trends, Kenya and Nairobi Urban population trends, Kenya and Nairobi
As the total urban population of Kenya continues to grow, the capital of Nairobi still harbours the largest share of the country’s urban population. Between 1948 and 2009, Nairobi’s share of the country’s urban population increased from 5.2 per cent to 32.4 per cent and in 2009 the city had an estimated 3.1 million inhabitants.
18 Mar 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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