Divining rods—really, just forked sticks—supposedly tremble when you hold them over any ground that conceals water below. Whether or not you subscribe to their seemingly magical, analog effectiveness, you might be thinking, isn't there an app for that?
Peter Arnold is working on it. As a founding codirector of the Arid Lands Institute at Woodbury University in Burbank, California, Arnold and his colleagues have developed the proof of concept for an app—Divining LA— that will make it easier for the city to assess the impact of land-use decisions on regional watersheds.
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