Economic Aspects of Some Groundwater Disposal Options for Irrigated Dairy Farms: A Preliminary Evaluation
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Net annual costs for disposal by pumping to the Murray River, an on-farm evaporation basin,
conjunctive use with surface water to irrigate dairy pasture, and undiluted irrigation of a salt
tolerant grass were estimated and compared. Total conjunctive use (TCU) is the cheapest
option below 10dS/m groundwater salinity. TCU becomes more expensive than river disposal
above 10 dS/m and than total evaporation above 15 dS/m. Above 10 dS/m, partial conjunctive
use with disposal of some groundwater by irrigating salt tolerant forage is similar in cost to
river disposal and less expensive than total on-farm evaporation.
Farm and regional perspectives for optimising sustainable salt management are discussed.