If you try to do a water balance in ozcot the existing water balance does not balance every year.
I have tracked the problem down to a a bug in ozcot that means in some years ep does not equal the actual amount of water that is removed from the soil water module via a "set dlt_sw_dep " command to remove the root water uptake from the soil each day.
I am going to leave it up to David Johnston to fix this but in the mean time I need to output the actual root water uptake so I can do a water balance that works. If you use ep the water balance will not balance using the existing ozcot.
The reporting variable I have created is called ozcot_rwu, which is an array variable where each element on the array represents the amount of water removed from a specific layer of the soil by the roots. Sum the array to get the total.
nb. This problem is also in mvozcot