Rethinking water scarcity: role of storage
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1 Rethinking water scarcity: role of storage Richard Taylor UCL Geography World Water Day 2010 ODI (London) Victoria Falls
2 outline water scarcity defining the global water crisis water stress index a critical review water scarcity, storage & demand informing adaptation
3 the global water crisis in the news Newspaper headlines on water scarcity
4 water scarcity: ratio between renewable freshwater resources and human demand for freshwater resources per capita < 1000 m 3 per year (Water Stress Index) freshwater withdrawals/resources > 0.4 (Relative Water Demand) large-diameter well in a sand river NE Botswana (headwater of the River Limpopo)
5 estimating freshwater demand based human freshwater use - 100L/person/day = 40m 3 /person/year (domestic) inherently linked to population growth collecting water from a spring in Kampala
6 associated agricultural, industrial & energy needs: 20 x 40m 3 /person/year total per capita : 840m 3 /year >1700m 3 /person/year (water sufficient) <1700m 3 /person/year (water stressed) <1000m 3 /person/year (water scarce) irrigation of Boro rice (Bangladesh)
7 estimating renewable freshwater resources: mean annual river runoff (MARR) River Bujugali Falls, Uganda
8 global water crisis - projections - projected rise in the number of people living in water-scarce regions from to 3-9 billion over the next century - vary by IPCC SRES scenario and water scarcity definition Oki & Kanae (2006) Science, 313,
9 African water crisis - projections
10 no relation between scarcity & access
11 Water Stress Index does not consider water quality collecting water from open scoop wells, Iganga Uganda
12 Water Stress Index does not consider environmental flows
13 MARR measure of freshwater resources assumes changes in basin storage are negligible or unimportant validity under climate change?
14 MARR does not disaggregate between ephemeral flows (stormflow) and HO/François Goemans Vilanculos Town, Mutarara District, Mozambique, 22 February 2007
15 and steady flows (baseflow). Water-well drilling in Rukungiri, Uganda Upper Nile Basin
16 southern Africa has the most variable river discharge in the world McMahon et al., J. Hydrol., 347, large-diameter well in a sand river NE Botswana (headwater of the River Limpopo)
17 Groundwater & Africa groundwater constitutes 25% of renewable freshwater resources in Asia; in Africa, it is 51%. Döll & Fiedler, HESS 12, Internally renewable groundwater supplies in sub-saharan Africa (1500 km 3 /year) are, however, estimated to be nearly double that of China and nearly four times that of India FAO, AquaStat on-line database. Food & Agriculture Organisation of the UN
18 MARR disregards soil-moisture storage yet, in sub- Saharan Africa, >95% of all food production derives from soil water matoke and tea growing in Bushenyi, Uganda
19 Water Stress Index does not inform adaptation to water shortages 1. to use water more efficiently Irrigated agriculture by groundwater-fed pivots in Zambia
20 2) to store more water Nalubaale Dam, Uganda
21 3) to withdraw water from basin storage Maize plantation irrigated by a groundwater-fed pivot, Katwe (Zambia)
22 water storage major shift from fine tuning estimates of freshwater flows to basic research characterising accessible freshwater storage potential of groundwater to improve resilience of communities in sub-saharan Africa The Kampala Statement Groundwater & Climate in Africa
23 rethinking estimation of water demand re-define water scarcity so that it better reflects how do people use water ( green and blue water resources) AGRA
24 redefining water scarcity define basin storage requirements to meet water demand McMahon et al., Journal of Hydrology 347,
25 small or large scale interventions to increase water storage could then be considered in relation to changing water demand (e.g. trading in virtual water) Merowe Dam, Sudan
26 UN Human Development Report 2006: Beyond scarcity: Power, poverty & the global water crisis We reject this [Malthusian perspective that global water problems are a problem of scarcity and population growth]. The availability of water is a concern for some countries. But the scarcity at the heart of the global water crisis is rooted in power, poverty and inequality, not in physical availability.
27 summary current water scarcity metrics do not represent well the magnitude and dimensions of the global water crisis an improved metric is required that better considers water storage and demand to inform debates about power and economics (water policies) & to allocate resources but at what scale and for whom? low-yielding well in Mbarara, Uganda
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