Elements Of Sanitary Engineering Classic Reprint PDF Download

Excerpt from Sanitary Engineering With Respect to Water-Supply and Sewage Disposal The correct form for masonry reservoir -dams exposed to a consider able water-pressure was determined, about the middle of last century, by careful mathematical calculations, carried out by a French engineer, in accordance with which the F urens darn was erected in 1861 - 1866, as mentioned on page 142, and has proved perfectly stable, and since which time several other high masonry dams have been constructed on similar lines, with equally satisfactory results; whereas, according to the conclusions drawn from the above experiments, those dams are unstable, are exposed to tensional strains reaching between 5 and to tons per square foot, and are subjected to shearing stresses far in excess of anything imagined. Turning now to the failure of masonry dams, the Austin dam in Texas, shown in section on page 146, should, according to the above theory, have failed by an opening at its toe under vertical tensional strains, and then have turned over; whereas, on the contrary, the darn was pushed bodily downstream in an upright posi tion by the horizontal water-pressure. The Bouzey dam also, in the first instance, and the gros-bois darn were pushed slightly forward by the water-pressure. Dock walls, moreover, do not fail by vertical dislocations in front, or by overturning if the toe rests on a solid foundation but they are pushed forward in an upright position by the pressure at the back. Unless any new theory, with regard to the stresses on masonry dams and their stability, can be proved to be more in accordance with the actual results of experience, especially in the case of failures, than the theory on which the designs of the principal masonry dams have been based during the last forty years, and have successfully borne the test in actual practice, the new theory cannot reasonably be accepted in preference to the old one; and whenever a theory, however authoritatively advanced, is evidently at variance with actual occurrences, it may safely be disregarded. 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.