Excerpt from Stratified Flow in Reservoirs and Its Use in Prevention of Silting Such complex stratification is, in fact, the usual condition at Lake Mead, where the delightful temperature of the surface layer attracts bathers in summer and the coolness Of the temperature Of the strata at the depths from which water is withdrawn makes it possible for trout to thrive below Boulder Dam. The transformers, the generator bearings, and in summer the powerhouse Offices, are cooled by circulating lake water. Some of the coldest water, however, is slightly brackish and forms a distinct stratum beneath which is a submerged and very muddy lake. Such a submerged muddy lake is possible because water strata, unlike rock strata, are mobile. The densest water naturally sinks to the bottom where, if there exists a slope, it may continue to flow until its progress is checked, perhaps by a dam or some other obstacle. A moving stratum of this kind 1s called a density current, because its slightly greater density gives it the power of motion. 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.