Half of the water flowing through regional river basins starts in so-called ephemeral streams. Last year, the Supreme Court curtailed federal protections for these waterways.
A riparian area in Wells, Nev., in the northeastern part of the state. In the West, ephemeral streams flow only for four to 46 days per year, on average, but contribute up to 79 percent of the downstream river flow, new research has found.
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