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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

(0.54 MB)

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.

2 Eekhout, J. P. C.; Delsman, I.; Baartman, J. E. M.; van Eupen, M.; van Haren, C.; Contreras, S.; Martinez-Lopez, J.; de Vente, J. 2024. How future changes in irrigation water supply and demand affect water security in a Mediterranean catchment. Agricultural Water Management, 279:108818. (Online first) [doi: https://doi.org/10.1016/j.agwat.2024.108818]

Water security ; Water demand ; Water supply ; Irrigation water ; Irrigated farming ; Nature-based solutions ; Socioeconomic aspects ; Socioeconomic development ; Land-use change ; Land management ; Trickle irrigation ; Precipitation ; Soil moisture ; Drought stress / Mediterranean region / Spain / Campo de Cartagena / Mar Menor

(Location: IWMI HQ Call no: e-copy only Record No: H052773)

https://www.sciencedirect.com/science/article/pii/S0378377424001537/pdfft?md5=8bea3cca429cb09ae74c812967d56ca8&pid=1-s2.0-S0378377424001537-main.pdf
https://vlibrary.iwmi.org/pdf/H052773.pdf

(3.85 MB) (3.85 MB)

It is likely that climate change will increase irrigation water demand and, consequently, reduces water security in the Mediterranean Basin if current irrigation supply and demand conditions are maintained. Climate change adaptation can be achieved by (1) decreasing irrigation water demand through more efficient irrigation techniques, (2) increasing irrigation water supply by adopting new technological advances, (3) converting to rainfed agriculture, and (4) implementation of Nature-based Solutions for water retention. The aim of this study was to assess the effectiveness of different combinations of these adaptation options on water security through analysis of contrasting scenarios of socio-economic development. We defined plausible scenarios of climate change, land use change and adaptation measures for an intensively irrigated catchment in south-eastern Spain under three Shared Socioeconomic Pathways (SSP), representing different storylines of socio-economic development. We considered three SSP scenarios, including the Sustainability pathway (SSP1), the Middle of the Road pathway (SSP2) and the Fossil-fueled Development pathway (SSP5). Future land use distributions were obtained with the iClue land use change model by accounting for differences in irrigation water demand and supply, resulting in a decrease (SSP1), a constant (SSP2) and an increase (SSP5) in irrigated agriculture. The impact of each scenario on a series of water security indicators was quantified using the SPHY-MMF hydrology-soil erosion model. The SSP2 scenario, which considers very limited climate change adaptation, projects the most severe impacts on water security, including an increase in plant water stress, flood discharge, hillslope erosion and sediment yield. Under SSP1, which accounts for most climate change adaptation strategies, irrigation water demand is significantly reduced due to a shift from irrigated to rainfed agriculture and the implementation of reduced deficit irrigation, while Nature-based Solutions reduce the impact on other water security indicators. Under SSP5, a conversion from rainfed to irrigated agriculture causes a significant increase in irrigation water demand, which is met by increasing irrigation water supply from desalination. SSP5 shows intermediate impacts on other water security indicators, which is explained by a strong decrease in annual precipitation. This study helps exploring how different future socio-economic pathways affect water security and thereby supports evidence-based policy development.