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Agricultural drainage water management in arid and semi ... - FAO.org

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ixList of boxesPage1. Need for conservation of <strong>water</strong> quality – Example from the Aral Sea Bas<strong>in</strong> 52. Need to <strong>in</strong>crease <strong>water</strong> use efficiency as result of <strong>water</strong> scarcity – An examplefrom Egypt 463. Non-beneficial unreasonable uses 504. Contribution of capillary rise <strong>in</strong> India 655. Capillary flux <strong>in</strong> the Dra<strong>in</strong>age Pilot Study Area 666. Adjusted sodium adsorption ratio 767. Conversion from meq/litre calcium to pure gypsum 788. The use of Sesbania as a green manure to improve soil chemical <strong>and</strong> physicalproperties 799. Direct reuse <strong>in</strong> Egypt <strong>and</strong> Pakistan 8210. Maximum reuse <strong>and</strong> m<strong>in</strong>imum disposal of <strong>dra<strong>in</strong>age</strong> <strong>water</strong> <strong>in</strong> the Nile Delta,Egypt, based on ma<strong>in</strong>ta<strong>in</strong><strong>in</strong>g favourable salt balance 9111. M<strong>in</strong>imum <strong>dra<strong>in</strong>age</strong> discharge requirements for ma<strong>in</strong>ta<strong>in</strong><strong>in</strong>g the fresh<strong>water</strong>functions of the Northern Lakes, Egypt 9212. Basics of an algal-bacterial system for the removal of selenium 10413. M<strong>in</strong>i-plot plant for the removal of heavy metals 104List of figuresPage1. Rise of the ground<strong>water</strong> table <strong>in</strong> Punjab, Pakistan 32. Example of a <strong>water</strong> <strong>management</strong> system with<strong>in</strong> an irrigation district 103. Example of a simplified holistic picture of the on-farm <strong>water</strong> <strong>management</strong>sub-system 104. The seven stages <strong>in</strong> the soft system methodology 115. Topography <strong>and</strong> boundaries of the Panoche Water District 146. Annual recharge to ground<strong>water</strong> <strong>in</strong> Panoche Water District 147. Annual amount of Se removed by the dra<strong>in</strong>s 158. Major chemical reactions <strong>in</strong> salt-affected soils 189. Physical <strong>dra<strong>in</strong>age</strong> <strong>water</strong> <strong>management</strong> options <strong>and</strong> how they relate to one another 2210. Options for disposal to surface <strong>water</strong> bodies 2611. Flowchart of process for select<strong>in</strong>g an optimal set of <strong>dra<strong>in</strong>age</strong> <strong>water</strong> <strong>management</strong>options 30

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