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Global_water_balance
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The purpose of the global water balance check is to assure that no water is lost (or unlost) when water is transferred between cells. The global water balance is only checked when river routing is turned on because all lateral water transfers (through river routing, reservoir irrigation, neighbour irrigation) occur with river routing.
During the year, all incoming and outgoing fluxes to and from each grid cell are recorded. Incoming fluxes are precipitation and withdrawals from “unsustainable” sources. Outgoing fluxes are terrestrial evapotranspiration (evaporation, transpiration, interception), lake and reservoir evaporation, conveyance losses, and consumptive water use for non-agricultural purposes. Discharge from river end cells that drain into the ocean or inland sinks is also represents and outflow from the model domain and is also recorded.
Difference between incoming and outgoing fluxes from the model domain (all simulated grid cells) equals the storage change in all water pools. The global water balance only has to be checked when river routing is turned on, otherwise