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Watershed (catchment) models in GIS, are based on Digital Terrain Model grids of the topography. Errors or uncertainties in the DTM can produce "pools" that will end up being separated from the surrounding catchments. Typically the guidance is to artificially fill these in until they reach the level of the pour point so they will drain to the catchment. ...


No water flows out of it, apparently... In summary, there used to be a big lake there, now its a basin with no flows into either ocean. Water there seems to be self contained, accumulating from rainfall and removed by evaporation.

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