Fingers of water creeping down a Colorado River side channel, pulse flow, March 25 2014, by John Fleck

In High Country News, Matt Jenkins on  the Colorado River delta environmental “pulse flow”, which grew out of “Minute 319”, an addendum to the U.S.-Mexico water treaty:

Over the past two decades, the Delta’s advocates have argued their case with perseverance, and a lot of good numbers. By monitoring the effect of the pulse flow, they’re hoping to make the case for a followup agreement — a Minute 320 — to kick off a long-term program of regular floods that mimic the natural dynamics of the river.