THE EFFECT OF EROSION ON A HILLSIDE FROM WHICH THE FOREST COVER HAS BEEN REMOVED
Further than this, every section has its own necessities. Rules that would apply to Oregon and Washington, with their sixty inches of rainfall a year, would not apply to Arizona, with its ten. One great mountain region, whose waters drained off into the ocean and could never be used for irrigating purposes, might safely be let open to all kinds of grazing; while another equally large section, just as well grassed, would have to be closed to sheep and goats, with their erosive little feet and habits of grazing in large bands, because all the drainage went into creeks, streams, and rivers that lower down on the desert were needed to irrigate vast areas of valuable farming lands.