for scene 23 of the video " Water Crisis: Healing the Colorado River - part 1" by Rolf Witzsche
here for a larger image
Determined by the direction of the flow of the atmosphere
The answer to where we can get the water from to heal the river, is determined by the direction of the flow of the atmosphere that carries the water vapour that could save the river.
Because of the rotation of the Earth, and the latency of the atmosphere above it, the atmosphere near the equator flows almost constantly from east to west. The flow pattern is evident in this composite image derived from satellite measurements. We see low rates of precipitation extending far out into the Pacific in the shadow of the American West-Coast mountains. The same flow also happens over land.
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Published by Cygni Communications Ltd.
North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F.