Excerpt from Some Aspects of Watershed Management in Southern California Most of California's water supply originates in its mountain areas, about half of which are occupied by the 18 national forests of the State. While the mountains receive from 30 to 90 inches of rainfall annually, the valleys in general receive less than 15 inches. The runoff of mountain water is depended upon for hydroelectric power, for irrigation, and for domestic and industrial use. In this rapidly growing State, the water yield of the mountain forests is fully as important a resource as are lumber and forage. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.