Reports Upon Fort Saint Philip Canal and Construction of Jetties, 1874 (Classic Reprint) PDF Download

Author: United States Army Corps of Engine Army
Publisher: Forgotten Books
ISBN: 9780666478979
Category : Technology & Engineering
Languages : en
Pages : 132

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Book Description
Excerpt from Reports Upon Fort Saint Philip Canal and Construction of Jetties, 1874 Upon examining the map of the recent soundings of Captain Howell we find that, at the crest of the present bar of the Southwest Pass, there was, in 1838, a depth of 125 feet. We also find that where, in 1838, at the distance of feet seaward of the bar, there was a depth of 145 feet, there is now only a depth of 45 feet, (this point, where the depth is only 45 feet, being feet seaward of the crest of the bar.) We find, further, that this bar is now being extended annually into the Gulf in water not so deep as the bar was advancing in in 1838. We find, also, that from the crest of the present bar to a depth of 100 feet the distance is now feet; whereas, in 1838, from the crest of the bar to 100 feet depth the distance was feet; and we find, further, that from this point, where there is now 100 feet depth outward, for the distance of some eight or ten miles, the deposit made on the bottom of the Gulf, be tween 1838 and 1873, is between 60 and 70 feet thick, or at about the rate of 2 feet per year. The mean annual amount of earthy matter in suspension carried to the Gulf by the Mississippi River would cover an area of one square mile 241 feet thick. The Southwest Pass carries to the sea part of this, and the larger portion of this mass is deposited. On an area about two and a half miles wide and ten miles long. If all were deposited on this area it would form a deposit feet thick. We have found, by the comparison of soundings, that over much the greater portion of the area the deposit is, on an average, 2 feet thick. The other portions of the suspended matter are carried ten or twenty miles, or even greater distances, further seaward, and also over greater widths than the mean I have used of two and a half miles. 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.