An anonymous reader writes "Using computations on the massive near-global SRTM surface model from NASA, this 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 of 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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