Selection of drainage and its phased implementation for salinity control |
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| Authors: | I W Makin H Goldsmith |
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| Institution: | (1) Overseas Development Unit, Hydraulics Research, Wallingford, Oxon, UK |
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| Abstract: | Soil salinity has often become a long-term problem associated with irrigated agriculture in the arid and semi-arid regions. But the problem can be controlled by good management of surface and groundwater resources. Management of groundwater is achieved through drainage, although drainage may not be necessary for some time after the initial construction of a scheme. This paper introduces a regional model for predicting expected soil salinity conditions and groundwater depths over an irrigation scheme. The model considers all the main hydrological systems which influence soil salinity and makes optimal use of sparse point field data from grid surveys. The model can be used to identify priority areas for reclamation measures, ie areas where conditions combine to produce high salinity levels. Thus drainage development can be phased over a period of time and targeted where it will be most effective. |
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| Keywords: | regional modelling salinity semi-arid regions irrigation drainage |
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