Your search found 10 records
1 Knox, J. W.; Weatherhead, E. K.; Bradley, R. I. 1997. Mapping the total volumetric irrigation water requirements in England and Wales. Agricultural Water Management, 33(1):1-18.
Irrigation water ; Water requirements ; Crop production ; Potatoes ; Mapping ; GIS ; Models / UK / Wales
(Location: IWMI-HQ Call no: PER Record No: H020730)
2 Weatherhead, E. K.; Knox, J. W.. 2000. Predicting and mapping the future demand for irrigation water in England and Wales. Agricultural Water Management, 43(2):203-218.
(Location: IWMI-HQ Call no: PER Record No: H026245)
3 Knox, J. W.; Weatherhead, E. K. 2005. The growth of trickle irrigation in England and Wales: Data, regulation and water resource impacts. Irrigation and Drainage, 54(2):135-143.
(Location: IWMI-HQ Call no: PER Record No: H036954)
4 Knox, J. W.; Weatherhead, K.; Ioris, A. A. R. 2007. Assessing water requirements for irrigated agriculture in Scotland. Water International, 32(1):133-144.
(Location: IWMI HQ Call no: P 7974 Record No: H040521)
5 De Silva, C. S.; Weatherhead, E. K.; Knox, J. W.; Rodriguez-Dias, J. A. 2007. Predicting the impacts of climate change: A case study of paddy irrigation water requirements in Sri Lanka. Agricultural Water Management, 93(1-2):19-29.
(Location: IWMI HQ Call no: PER Record No: H040526)
(1.29 MB)
6 Weatherhead, E. K.; Knox, J. W.; de Vries, T. T.; Ramsden, S.; Gibbons, J.; Arnell, N.W.; Odoni, N.; Hiscock, K.; Sandhu, C.; Saich, A.; Conway, D.; Warwick, C.; Bharwani, S.; Hossell, J.; Clemence, B. 2005. Sustainable water resources: a framework for assessing adaptation options in the rural sector. Project T2/33 Final report. Norwich, UK: Tyndall Centre for Climate Change Research, University of East Anglia. 68p. (Tyndall Centre Technical Report 44)
Climate change ; Irrigated farming ; Supplemental irrigation ; Land management ; Simulation models ; Catchment areas ; Case studies ; Groundwater recharge ; Rivers ; Farmers attitudes / UK / Wales / North Norfolk
(Location: IWMI HQ Call no: e-copy only Record No: H042176)
(0.82 MB)
7 Knox, J. W.; Shamal, S. A. M.; Weatherhead, E. K.; Rodriguez-Diaz, J. A. 2009. The challenges of mapping irrigated areas in a temperate climate: experiences from England. In Thenkabail, P. S.; Lyon, J. G.; Turral, H.; Biradar, C. M. (Eds.). Remote sensing of global croplands for food security. Boca Raton, FL, USA: CRC Press. pp.237-250. (Taylor & Francis Series in Remote Sensing Applications)
(Location: IWMI HQ Call no: 631.7.1 G000 THE Record No: H042424)
8 Carr, M. K. V.; Lockwood, R.; Knox, J. W.. 2012. Advances in irrigation agronomy: plantation crops. New York, NY, USA: Cambridge University Press. 343p.
Plantations ; Agriculture ; Crop production ; Roots ; Bananas ; Theobroma cacao ; Coconuts ; Coffee ; Oil palms ; Rubber crops ; Sisal ; Sugarcane ; Tea ; Plant water relations ; Water requirements ; Water productivity ; Irrigation systems ; Irrigation scheduling ; Drip irrigation ; Evapotranspiration ; Drought
(Location: IWMI HQ Call no: 633 G000 CAR Record No: H045937)
9 Lankford, B.; Closas, A.; Dalton, J.; Gunn, E. L.; Hess, T.; Knox, J. W.; van der Kooij, S.; Lautze, Jonathan; Molden, D.; Orr, S.; Pittock, J.; Richter, B.; Riddell, P. J.; Scott, C. A.; Venot, J.-P.; Vos, J.; Zwarteveen, M. 2020. A scale-based framework to understand the promises, pitfalls and paradoxes of irrigation efficiency to meet major water challenges. Global Environmental Change, 65:102182. [doi: https://doi.org/10.1016/j.gloenvcha.2020.102182]
Irrigation efficiency ; Water management ; Frameworks ; Policies ; Water allocation ; Irrigation systems ; Water scarcity ; Sustainable Development Goals ; Hydrology ; Technology ; River basins ; Canals ; Water use ; Water loss ; Stakeholders ; Farmers
(Location: IWMI HQ Call no: e-copy only Record No: H050057)
https://www.sciencedirect.com/science/article/pii/S0959378020307652/pdfft?md5=1d4aa4ec98836a41507a0dfd1fd6fb3a&pid=1-s2.0-S0959378020307652-main.pdf
https://vlibrary.iwmi.org/pdf/H050057.pdf
https://vlibrary.iwmi.org/pdf/H050057.pdf
(2.53 MB) (2.53 MB)
An effective placement of irrigation efficiency in water management will contribute towards meeting the pre-eminent global water challenges of our time such as addressing water scarcity, boosting crop water productivity and reconciling competing water needs between sectors. However, although irrigation efficiency may appear to be a simple measure of performance and imply dramatic positive benefits, it is not straightforward to understand, measure or apply. For example, hydrological understanding that irrigation losses recycle back to surface and groundwater in river basins attempts to account for scale, but this generalisation cannot be readily translated from one location to another or be considered neutral for farmers sharing local irrigation networks. Because irrigation efficiency (IE) motives, measures, effects and technologies play out at different scales for different people, organisations and purposes, and losses differ from place to place and over time, IE is a contested term, highly changeable and subjective. This makes generalisations for science, management and policy difficult. Accordingly, we propose new definitions for IE and irrigation hydrology and introduce a framework, termed an ‘irrigation efficiency matrix’, comprising five spatial scales and ten dimensions to understand and critique the promises, pitfalls and paradoxes of IE and to unlock its utility for addressing contemporary water challenges.
10 Lankford, B.; Pringle, C.; McCosh, J.; Shabalala, M.; Hess, T.; Knox, J. W.. 2023. Irrigation area, efficiency and water storage mediate the drought resilience of irrigated agriculture in a semi-arid catchment. Science of the Total Environment, 859(part 2):160263. (Online first) [doi: https://doi.org/10.1016/j.scitotenv.2022.160263]
Irrigation efficiency ; Water storage ; Irrigated farming ; Drought ; Resilience ; Catchment areas ; Semiarid zones ; River basins ; Water accounting ; Water conservation ; Water management ; Water demand ; Water supply ; Farmers ; Fruits ; Models ; Case studies / South Africa
(Location: IWMI HQ Call no: e-copy only Record No: H051567)
https://www.sciencedirect.com/science/article/pii/S0048969722073636/pdfft?md5=f0dc63a8c783c0f36b4010541ae67db6&pid=1-s2.0-S0048969722073636-main.pdf
https://vlibrary.iwmi.org/pdf/H051567.pdf
https://vlibrary.iwmi.org/pdf/H051567.pdf
(3.60 MB) (3.60 MB)
We examined the effects of hydrological variables such as irrigation area, irrigation efficiency and water storage on the resilience of (mostly commercial) irrigated agriculture to drought in a semi-arid catchment in South Africa. We formulated a conceptual framework termed ‘Water, Efficiency, Resilience, Drought’ (WERD) and an accompanying spreadsheet model. These allow the resilience of irrigated agriculture to drought to be analysed via water accounts and a key resilience indicator termed Days to Day Zero (DDZ). This represents the number of days that a pre- and within-drought supply of catchment water available to irrigation is withdrawn down to zero in the face of a prolonged drought. A higher DDZ (e.g. >300 days) indicates greater resilience whilst a lower DDZ (e.g. <150 days) signals lower resilience. Drought resilience arises through land and water management decisions underpinned by four types of resilience capacities; absorptive, adaptive, anticipative and transformative. For the case study, analyses showed that irrigators, with currently approximately 23,000 ha under irrigation, have historically absorbed and adapted to drought events through construction of water storage and adoption of more efficient irrigation practices resulting in a DDZ of 260 days. However, by not fully anticipating future climate and water-related risks, irrigators are arguably on a maladaptive pathway resulting in water supply gains, efficiency and other practices being used to increase irrigation command areas to 28,000 ha or more, decreasing their capacity to absorb future droughts. This areal growth increases water withdrawals and depletion, further stresses the catchment, and reduces future DDZs to approximately 130 days indicating much lower drought resilience. Our approach, supported by supplementary material, allows stakeholders to understand the resilience consequences of future drought in order to; reconcile competition between rising water demands, consider new water storage; improve agricultural and irrigation planning; and enhance catchment governance.
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