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A comment on River Runner: drop a raindrop anywhere in the USA, watch where it ends up.

Re:River Runner: drop a raindrop anywhere in the USA, watch ... by howzitallworkeh on Wednesday May 26, 2021 @11:37PM (#27299112)
Cool project - and I like that it uses USGS hydrography data.

They publish all kinds of terrain survey information about the entire USA for free. There's probably enough data to make your own GPS mapping device/app.

https://www.usgs.gov/products/maps/gis-data

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Re:River Runner: drop a raindrop anywhere in the USA, watch ... by jubjubbird on Thursday May 27, 2021 @12:56PM (#27305221)
And here's a USGS site that delineates a watershed from any point on a stream:

https://www.usgs.gov/mission-areas/water-resources/science/s...

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