Successful groundwater recharge requires a combination of conditions which allow optimum flow rates and satisfactory removal of contaminants. It has been shown that the local soil (Bassendean sand) in a proposed recharge basin on the Swan Coastal Plain would not be suitable for removing nitrogen using spreading basins with an alternate flooding and drying operation.\ud \ud A mathematical model has been developed to simulate nitrogen removal under the above conditions, and based on a simplified version of the model limiting conditions on soil properties and operating variables have been derived within which nitrogen removal can be expected. The mathematical model points to areas where further work is required to enable optimization of nitrogen removal to be carried out. It also suggests that under a regime of 7 days flooding and 5 days drying that Pyrton Sandy Loam or a mixture of 20% Pyrton Loam and 80% Spearwood Sand, would be suitable soils if placed on the recharge site to a depth of 1 metre
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