Abstract
ABSTRACT Apaired catchment study of field-sized water-harvesting plots showed that precipitation runoff efficiency from an area treated with a spray application of a sodium carbonate salt solution at a rate of 44.9 g of salt per m^ was 46% of the total precipitation compared to 33% from an untreated catchment for a 3-yr period. After 3 yr the treatment was no longer effective. Runoff efficiency evaluations with a small sprinkler of a 14-yr old, operational-sized, runoff-farming catchment treated with granulated sodium chloride salt mixed into the soil at a rate of 1120 g of salt per m^ showed that runoff was over 80% of the total precipitation from the treated areas compared to 55% from similar untreated areas. Measured runoff from sprinkler evaluations of treatment effectiveness was higher when distilled water was used than when using the local top water. Soil erosion was not a problem on soils which developed a gravel protective layer on the catchment surface. Water costs from salt treated catchments are estimated at $0.08 to 0.59/1000 L in a 500 mm rainfall zone.
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