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understanding / reproducing the water balance
Can anyone explain which queries to use if you want to reproduce the water balance?
I can manage to reproduce some of them with gridvolume statements, e.g. evaporation, seepage and underground unsaturated storage. I can manage to reproduce rain as well, by multiplying the input values with the active landsize, which I derive from the base type overlay. So far, so good.
However, I'm at a loss when it comes water surface, land surface, and underground saturated storage. I've found that a query which selects the grid volume of the surface last value results in the sum out amount of land surface and water surface. But if I want to distinguish between land and water, using a "TERRAIN_WITH_ATTRIBUTE_IS_WATER" statement, the result differs from the water balance. In addition, I can't conjure up any query which results in the sum in amount of water surface and the underground saturated storage amount. Which queries must I use to reproduce them?