Thewater table is assumed to be 10min both cases. Thismarks a difference
between this and a previous analysis (Gathorne-Hardy et al.,
2013), which used the water table as described by the farmers. The advantage
of using a constant figure is it reduces the difference between
the farm systems; it allows easy manipulation to test the sensitivity of
water table to the final result; and it allows easy comparisons between
this and other areas. Energy and GHG emissions associated with irrigation
have been fixed for a 10 m water table.