Collect drainage water and re-use
Ideally, as system efficiency increases, the capacity for capturing large amounts of re-usable water decreases. However, weather, changing environmental conditions and system errors can lead to over-irrigation and run-off.
Installing systems to trap run-off water and pump it back to the top of the irrigation system for re-use can save large amounts of water.
Water capture can also recycle fertilisers, which decreases the amount that you have to apply. A large number of cotton farms in Australia already use a drainage/recycle system that not only saves water but also prevent pesticides, herbicides and nutrients from entering the local water system.
Keep in mind that recycling water can increase concentrations of nutrients and farm chemicals. You should monitor recycled water quality to ensure that it is fit for the intended use.
Installing systems to trap run-off water and pump it back to the top of the irrigation system for re-use can save large amounts of water.
Water capture can also recycle fertilisers, which decreases the amount that you have to apply. A large number of cotton farms in Australia already use a drainage/recycle system that not only saves water but also prevent pesticides, herbicides and nutrients from entering the local water system.
Keep in mind that recycling water can increase concentrations of nutrients and farm chemicals. You should monitor recycled water quality to ensure that it is fit for the intended use.