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- In hydrologic terms, the part of the discharge from a drainage basin that occurs through the ground water. The term "underflow" is often used to describe the ground water outflow that takes place in valley alluvium (instead of the surface channel) and thus is not measure at a gaging station.
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- Basin, Basin Boundary, Basin Recharge, Catchment Area, Creek, Depth of Runoff, Detention Basins, Drainage area, Drainage basin, Drainage Divide, Headwater Basin, River Basin, Stilling basin, Watershed