Predicting and mapping the future demand for irrigation water in England and Wales
Identifieur interne : 001194 ( Main/Merge ); précédent : 001193; suivant : 001195Predicting and mapping the future demand for irrigation water in England and Wales
Auteurs : E. K Weatherhead [Royaume-Uni] ; J. W Knox [Royaume-Uni]Source :
- Agricultural Water Management [ 0378-3774 ] ; 2000.
Abstract
A methodology has been developed for predicting the future growth in demand for irrigation in countries with supplemental irrigation such as England and Wales. This takes into account expected changes in agricultural policy, technical, market and other factors. The methodology has also been applied within a geographical information system (GIS) to map the growth. The GIS approach represents an extension of a procedure developed by Knox et al. (1997) (Knox, J.W., Weatherhead, E.K., Bradley, R.I., 1997. Agricultural Water Management 33, 1–18). The total net volumetric actual irrigation water requirements for a `design' dry year (20% exceedance), are predicted to rise from 168×106m3 in 1996 to 244×106m3 in 2021. Meanwhile, the total net volumetric theoretical irrigation water requirements for a `design' dry year, are predicted to rise from 204×106m3 in 1996 to 247×106m3 in 2021. Maps are presented showing the predicted change in the spatial distribution of irrigation demand between 1996 and 2021, and the theoretical dry year irrigation demand for all irrigated crops in 2021. The application and limitations of the methodology are discussed.
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DOI: 10.1016/S0378-3774(99)00058-X
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