All drainage is estimated to 600 mm depth for all blocks.
For crops, plant available water for transpiration is dependent on water content to 1500 mm or the default rooting depth for the crop or the impeded depth, whichever is smaller. Soil water for evaporation is dependent on the top 10cm water content.
Estimating drainage at the same depth for all blocks provides alignment of the crop and pastoral block models. In particular, the urine N model and estimation of irrigation depths now operates consistently across all blocks. This change also provides a clear framework to model N removal by deeper rooting crops.