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I am playing around a bit with the Groundwater Overlay. Therefore I've created a empty map (size 1000x1000m). In the overlay I've created a weather event. It will rain for 2 hours and the total rainfall is 10 mm. Calculation Preferences is set to Accuracy. Grid cell size is 0.5 m (Grid accuracy Threshold is also 0.5 m).
I would expect the water balance will show me the total amount of water is (1000 m * 1000m * 0.01 m) 10000 m³. However the Water Balance tells me the total volume of water In is 9960 m³.
If I change the grid cell size to 1 m (Grid Accuracy Threshold also to 1 m) the Water Balance changes to 9920 m³ (see screenshot below).
Why isn't the total amount of rainwater not 10000 m³. I guess it has something to do with the grid cell size, but I don't see how it is related.