Of the remaining "'6 % "', the majority is irrigated by methods requiring energy, expensive hydraulic pressure techniques and pipe systems like sprinkler irrigation and drip irrigation, for the major part in the USA . The source of irrigation water in these cases often is groundwater from aquifers.
12.
Although fairly high irrigation efficiencies of 70 % or more ( i . e . losses of 30 % or less ) can occur with sophisticated techniques like sprinkler irrigation and drip irrigation, or by well managed surface irrigation, in practice the losses are commonly in the order of 40 % to 60 %.
13.
As part of it's developing role the Commonwealth Environmental Water Office has provided both water and funding to support community environmental watering projects . Refurbished irrigation equipment used to irrigate Blackbox woodlands, South Australia For example in South Australia a not for profit organization called "'Nature Foundation SA "'undertakes extensive environmental irrigation using both flood irrigation and sprinkler irrigation technologies and practices.
