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1 Dillon, P.; Gale, I.; Contreras, S.; Pavelic, Paul; Evans, R.; Ward, J. 2009. Managing aquifer recharge and discharge to sustain irrigation livelihoods under water scarcity and climate change. In Bloschl, G.; van de Giesen, N.; Muralidharan, D.; Ren, L.; Seyler, F.; Sharma, U.; Vrba, J. (Eds.). Improving integrated surface and groundwater resources management in a vulnerable and changing world: proceedings of Symposium JS.3 at the Joint Convention of the International Association of Hydrological Sciences (IAHS) and the International Association of Hydrogeologists (IAH), Hyderabad, India, 6-12 September 2009. Wallingford, UK: International Association of Hydrological Sciences (IAHS). pp.1-12. (IAHS Publication 330)
Hydrogeology ; Water scarcity ; Aquifers ; Groundwater recharge ; Climate change ; Water supply ; Case studies ; Farmer-led irrigation ; Farmer managed irrigation systems / Australia / India / Philippines / Queensland / Angas-Bremer Rivers / Adelaide / Tamil Nadu / Andhra Pradesh / Gujarat / Ilocos Norte
(Location: IWMI HQ Call no: e-copy only Record No: H042539)
http://ks360352.kimsufi.com/redbooks/a330/iahs_330_0001.pdf
https://vlibrary.iwmi.org/pdf/H042539.pdf
https://vlibrary.iwmi.org/pdf/H042539.pdf
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Decreasing mean annual rainfall, and the increasing rainfall intensity, temperature and evaporation, forecast for semi-arid parts of the world where water supplies are already stressed will require storage capacity to be increased or more stable resources to be harnessed to maintain security of water supplies at current levels. Managed aquifer recharge (MAR) to enhance below-ground storage of water is considered a positive contribution to stabilising drinking water supplies in cities subject to climate change. However, this paper shows that in rural irrigation areas where groundwater levels are already dropping due to an imbalance between extraction and natural recharge, unless favourable conditions permit sufficient recharge enhancement, MAR will need to be supplemented by discharge management to be successful in sustaining irrigation supplies. In fractured rock aquifers with low storage capacity, the symptoms of excessive demand are accelerated. In some cases MAR may give false hope where the benefits only accrue to the wealthiest landholders with deepest wells, or landholders closest to recharge facilities. This paper contains theoretical examples and case studies from Australia and India to illustrate a spectrum of approaches involving different contributions of recharge enhancement and discharge management to reduce groundwater deficits. A model for farmer-led groundwater demand management in the Philippines is anticipated to be effective in constraining consumption and preventing coastal saline intrusion in northern Luzon where aquifers are at an early stage of development. Similarly, models are proposed to reduce demand on aquifers that are already showing advanced symptoms of stress, while equitably supporting livelihoods at their maximum sustainable value.
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