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Irrigation water can come from a number of sources i.e. channel supply, groundwater, drains, and streams. To calculate how much water you apply to the area of perennial pasture on your farm all these sources have to be considered (Table 2.4). Water that is recycled from your farm’s drainage reuse system should not be included in your water budget. But if runoff from your pasture area is used to irrigate a crop elsewhere outside the area, then an allowance for this would need to be made. If your runoff is not used for irrigation, it should be included as water use. This is an obvious area for improvement.
Table 2.4. Annual water budget for irrigated area (example)
|Channel supply water (ML)|
|Bore water (ML)|
|Drainage diversion (ML)|
|Stream diversion (ML)|
|Runoff used elsewhere (deduct) (ML)|