“Psst… Groundwater and Surface Water Do Mix” – New York Times

[Excerpt:]

“An article published in the journal Geophysical Research Letters this week describes a new and simple way of measuring groundwater’s contribution to small streams on the surface. . .

Groundwater, they found, tends to be cooler than surface water in summer and warmer in winter; the infrared devices record the difference and produce images that show groundwater as clearly as night goggles show a human figure in the dark. . .

. . . while the Freiburg researchers show side-by-side photographs of streams as seen by the naked eye, and the same streams with the groundwater inflow clearly visible to infrared sensors, California water law, figuratively, closes its eyes, operating under theories that are largely oblivious to the connections that the Freiburg researchers and others have been documenting for decades.

. . .