Excerpt from Preliminary Chemical-Quality Study in the Manhattan Beach Area, California In 190h.mendenhall (1905) made a survey of the ground water conditions in southern California At the time of his survey the piezqmetric surface in the area was above sea level, but since that time water levels have declinedo During the 1920's, years of rapid development, the water levels declined at an increasing ratee However, because of decreased pumping during the depression.years of the 1930's, the levels tended to recover somewhat, During the war years of the l9ho's, a large expansion of industry occurred in the area, and'ground water withdrawals greatly increased. By l9h5 water levels in some areas had declined as much as 70 feet below sea level, In the coastal region this heavy with drawal and the ensuing dry years rapidly lowered the ground water levels, reversing the normal seaward flow of the underground water to a landward flow. 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.