5 1 8 Mr. L. F. Vernon-Harcourt, 



of the outlet of the trained channel opposite Honfleur emerges again, 

 though smaller in extent owing to alterations in the channel; and 

 the deep place at the end of the southern training wall, close to 

 Honfleur, is the same in both charts. 



Scheme E. The fifth arrangement of training walls introduced 

 into the model was taken from a design* published in 1888, which is 

 a modification of a scheme, presented in 1886, by a Committee of 

 experts appointed by the French Government to consider the 

 question. f In the scheme as laid down in the model, the trained 

 channel in the bend between Quillebeuf and Tancarville, where the 

 depth was greatest, was enlarged in width by setting back the 

 southern training wall ; the original width of the channel was 

 retained at the point of inflexion opposite Tancarville, and the 

 channel was widened out below La Roque by a modification of the 

 lines of both training walls down to Berville. The training walls 

 were also extended beyond Berville in sinuous lines, as shown on 

 Plate 4, fig. 1, the southern wall being carried down to Honfleur, and 

 the northern wall not quite so far. The portion forming the last 

 bend of the northern training wall was kept low, whilst the others 

 were made high, according to the design. Both in this and the 

 preceding arrangement of training wells experimented on, the 

 expanding trained channel was somewhat restricted in width along 

 the portions near the changes of curvature, to make it conform to 

 the principles which experience has laid down for training winding 

 rivers in their non-tidal course, as previously mentioned. The results 

 obtained, after working the model for about 3700 tides, are represented 

 on the chart (Plate 4, fig. 1). The channel between the training 

 walls was somewhat shallow in places; and though a deep channel 

 was formed along the inner concave face of the southern wall 

 between La Roque and Berville, a shoal emerging above low water 

 appeared along the concave face of the last bend of the northern 

 training wall. This bank appeared to be due to the protection the 

 extremity of the bend afforded from the action of the flood tide in the 

 model ; whilst the ebb followed the central flood- tide channel, instead 

 of passing over to the concave bank as would have occurred with the 

 current of a non-tidal river. The main channel beyond the training 

 walls, which, though of fair depth, was somewhat narrow and 

 winding, was also unstable ; for in the early part of the experiment, 

 its outlet was in the central channel between Ratier and Amfard in 



* c De 1* Amelioration dn Port, du Harre et des Passes de la Basse-Seine,' Baron 

 Quinette de Roehemont, Paris, 18SS, excerpt ' Momoires delaSoeiete des Ingenieurs 

 Civils,' 1888, p. 324, Plate 162, fig. 1. 



f ' Commission d'fitude des Ameliorations a apporter an Port du Havre et aux 

 Passes de la Basse-Seine, Rapport de la Commission,' Paris, 18b6, p. 61, and 

 chart. 



