Irrigation with either moderate to highly saline and\or sodic water can create problems within the root-zone. Application of saline water for example can lead to increased salinity within the seedbed if there is insufficient leaching of the salts through the soil profile. Where there is excessive deep drainage, shallow saline water tables may be created and result in the concentration of salts within the root-zone through capillary rise. in order to determine the possible effect and long term sustainability of irrigated agricultural production in a particular area two things are necessary. The first is information about the spatial distribution of soil and water resources suitable and currently being used for irrigation. This can be collected by reconnaissance soil surveys (Odeh et al , 1996) or from already existing soil and water quality information. Secondly, soil\water balance models can be used effectively to estimate soil salinity build-up and deep drainage beyond the root-zone using this information.