In The Water we see that agriculture uses 72 per cent of Australia's water. The largest irrigation systems are in the Murray-Darling Basin, which produce 40 per cent of Australia's agricultural wealth. Salinity is threatening the future capacity of these industries. This episode examines just how saline the Murray-Darling system is and why it's getting saltier. Engineering has created an extraordinary ability to trap and use water - but at what cost to the environment? As the water gets saltier, irrigators are forced to use more water and the problem is exacerbated