Your search found 4 records
1 Katic, Pamela; Grafton, Q. 2011. Optimal groundwater extraction under uncertainty: resilience versus economic payoffs. Journal of Hydrology, 406(3-4):215-224. [doi: https://doi.org/10.1016/j.jhydrol.2011.06.01]
Groundwater extraction ; Economic impact ; Aquifers ; Salt water intrusion ; Recharge ; Soil hydraulic properties
(Location: IWMI HQ Call no: e-copy only Record No: H044134)
(0.87 MB)
This paper evaluates the trade-off between resilience and economic payoffs in terms of groundwater extraction where there is a risk of an irreversible and catastrophic event. A dynamic and spatial model is developed that incorporates a stochastic recharge process and the risk of an irreversible catastrophic event (such as saltwater intrusion) that arises when hydraulic heads fall below a given threshold. The results show that if the threshold is uncertain then controlling both the rate and depth of extraction can generate a higher economic return and a lower probability of crossing the threshold than only controlling the rate of extraction. This occurs even if the extraction rate is set optimally and is less than the extraction rate than when two forms of control are used. The model and ndings provide an applied framework to understand and to quantify where there might be ‘win–win’ outcomes, and trade-offs between economic payoffs and resilience in terms of groundwater extraction.
2 Katic, Pamela; Grafton, R. Q. 2012. Economic and spatial modelling of groundwater extraction. Hydrogeology Journal, 20(5):831-834. [doi: https://doi.org/10.1007/s10040-011-0817-z]
(Location: IWMI HQ Call no: e-copy only Record No: H044697)
(0.07 MB)
3 Katic, Pamela; Morris, J. 2016. Targeting investments in small-scale groundwater irrigation using Bayesian networks for a data-scarce river basin in Sub-Saharan Africa. Environmental Modelling and Software, 82:44-72. [doi: https://doi.org/10.1016/j.envsoft.2016.04.004]
Groundwater irrigation ; Small scale farming ; River basins ; Smallholders ; Intensification ; Geographical information systems ; Investment ; Decision support systems ; Living standards ; Drip irrigation ; Water availability ; Case studies / Africa South of Sahara / White Volta Basin
(Location: IWMI HQ Call no: e-copy only Record No: H047583)
(5.59 MB)
Irrigation for smallholder farming systems is an important approach for sustainable intensification and increased productivity in Sub-Saharan Africa, provided investments in irrigation are properly targeted and accompanied by complementary improvements. Many GIS-based tools have been developed to identify suitable areas for investments in different types of small scale irrigation (SSI), but they do not explicitly address uncertainty on the data input and on the determination of factors that affect success of an investment in a given context. This paper addresses this problem by presenting an application of a decision-support targeting tool based on Bayesian networks (BNs) that can be used by non-expert policy-makers and investors to assess the potential success of specific technologies used for groundwater-based SSI. A case study application for the White Volta Basin in West Africa is presented to illustrate the BN approach.
4 Grafton, R. Q.; McLindin, M.; Hussey, K.; Wyrwoll, P.; Wichelns, D.; Ringler, C.; Garrick, D.; Pittock, J.; Wheeler, S.; Orr, S.; Matthews, N.; Ansink, E.; Aureli, A.; Connell, D.; De Stefano, L.; Dowsley, K.; Farolfi, S.; Hall, J.; Katic, Pamela; Lankford, B.; Leckie, H.; McCartney, Matthew; Pohlner, H.; Ratna, N.; Rubarenzya, M. H.; Raman, S. N. S.; Wheeler, K.; Williams, J. 2016. Responding to global challenges in food, energy, environment and water: risks and options assessment for decision-making. Asia and the Pacific Policy Studies, 3(2):275-299. [doi: https://doi.org/10.1002/app5.128]
Risk assessment ; Food security ; Food production ; Energy ; Sustainable development ; Intensification ; Resilience ; Environmental effects ; Water resources ; Decision making ; Households ; Stakeholders ; Farmers ; Poverty
(Location: IWMI HQ Call no: e-copy only Record No: H047589)
(1.14 MB) (1.14 MB)
We analyse the threats of global environmental change, as they relate to food security. First, we review three discourses: (i) ‘sustainable intensification’, or the increase of food supplies without compromising food producing inputs, such as soils and water; (ii) the ‘nexus’ that seeks to understand links across food, energy, environment and water systems; and (iii) ‘resilience thinking’ that focuses on how to ensure the critical capacities of food, energy and water systems are maintained in the presence of uncertainties and threats. Second, we build on these discourses to present the causal, risks and options assessment for decision-making process to improve decisionmaking in the presence of risks. The process provides a structured, but flexible, approach that moves from problem diagnosis to better risk-based decision-making and outcomes by responding to causal risks within and across food, energy, environment and water systems.
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