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The Pamphlet Collection of Sir Robert Stout: Volume 62

Scour Carried by Wall

Scour Carried by Wall.

The material of the river bottom along the face of the staiths and wharf is easily scoured by floods, and the construction of the training wall will page 7 have a powerful effect in increasing the velocity of the current. It is therefore to be expected that deep water will be maintained by natural scour whenever the wall is built. At present, however, the navigable channel is in places neither deep enough nor wide enough, and therefore while depending on the training wall to maintain the depth, I would recommend that the only dredging to be carried out be that required to form a channel 250 feet wide at the bottom and 14 feet deep at l.w.s.t., extending from the upper part of the Government wharf, along the face of the wharves and staiths, and out to the deep channel at the West breakwater. A large part of this is already deep enough, and only requires to be widened. But from opposite the proposed floating-basin to the deep channel near the West breakwater, the training wall, as shown in plan, crosses the fairway of the channel at present in use by steamers. If the floating-basin is to be carried out this training wall is necessary to keep the deep water channel near the basin, and divert it from its present position on the opposite side of the river.