DISCUSSION. ENGINEERING WORKS FOR THE IMPROVEMENT OF THE ESTUARY OF THE MERSEY. MARITIME & WATERWAYS PAPER 13.

Abstract

Discussion, 111 the ubseuce of the Author abroad, I r . A. B. Porter iuLroduced the Paper with the aid of a series of lantern-slides.The Chairman observed that some members might be surprised by the figures given in the Paper relating to dredging operations, but in works of that kind they were always of an astronomical nature. He had been given the following figures for similar operations a t American ports : Philadelphia 152 million cubic yards ; New York 124 million cubic yards ;Galveston 12if million cubic yards, per annum ; therefore the figures for the River Mersey were not so high as they appeared a t first glance. If those navigable channels were to be mdintained beyond their natural bed it was necessary to dredge, and Mr. A. G. Lyster had realized, in 1912, that the limit of improvement from dredging alone had been attained and that further improvement from dredging could not be expected except ill conjunction with the proposed training banks. The latter had been very successful.It might be asked why the works had taken such a long time. During Downloaded by [ UNIVERSITY OF IOWA LIBRARIES] on [11/09/16].