An anonymous reader writes: Using computations on the massive near-global SRTM surface model from NASA, the map lets you query watersheds, interactively set the sea-level and flood the world (North America at 500m increase in sea-level), or play around with river thresholds on a global or regional scale (computed rivers around NYC/NJ). It can be used to get an understanding for the watersheds and water flow paths in your local neighborhood, do you know where rain (or pollutants) that falls in your backyard end up? The map is freely available to the public.
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