A new online tool is now available to help Australian farmers retain the huge quantities of stored surface water they annually lose to evaporation and seepage. Called the Ready Reckoner, the free, web-based program calculates the cost of using liners or dam covers against the cost of losing water. It was developed in a partnership between the Co-operative Research Centre for Irrigation Futures (CRC IF), National Centre for Engineering in Agriculture (NCEA), National Program for Sustainable Irrigation, FSA Consulting and the Queensland Government.