The Harvey Water Irrigation Area (HWIA) is Western Australia's prime irrigated dairying area supplying Perth and the south west with more than 40 per cent of its milk. Irrigated agriculture commenced in Harvey with the establishment of a weir in 1916. Since that time, pastures have been watered through surface irrigation of paddocks which over time have been leveled and divided into irrigation bays. When this project was envisaged in 2001, there were no centre