Appendix III. 155 



If it be intended to improve the bar by extending- the Best groyne, 

 this ought to be extended till the depth actually wanted alongside is 

 reached, and in imitation of what is observed in nature, in direction 

 opening up against the tide current. To obtain, how T ever, a deep 

 channel over the bar, dredging- along this side of the jetty will have to 

 be resorted to. The scouring of a new channel without it is at best 

 hazardous and uncertain, even w T ith a sandy bottom, and in many cases 

 impossible, particularly in clay and silt, like in this case. 



By laying a training dam in a direction so that it lies at an angle on 

 the inflowing tide current, this will be deflected and led by it, and in 

 that way keep the. channel open. If no such training dam is made the 

 incoming current and the draw of the Essequebo east mouth will sweep 

 across the channel and tend to till it up. On the outer edge of the bar 

 this current exists during the whole flood time. Nearer the shore a set 

 to the west is also perceptible after half tide, as then the Boerasirie 

 channels begin to draw. This tide current is what has very possibly 

 been mistaken for a littoral current, and to this the damage of the 

 " Haarlem " front w T as ascribed. It has, however, always been at least 

 two miles to seaward of the coast in front of ' ; Haarlem." 



The draw of the Boerasirie channels is only perceptible about 

 " Uitvlugt " and " Leonora,'" and there exists only slightly and without 

 attacking the coast-line. 



For the reasons here above given, it is therefore advised that : 1st : 

 The Pouderoyen groyne be not further proceeded w T ith, and that also the 

 groynes on the sea wall should remain without further repairs, except 

 the C groyne at the Fort, which should be strengthened. On the river 

 front a " pierre perdue !1 protection will be more effectual than a groyne. 



2nd. That the lines of sterlings along the City waterside should be 

 replaced by a continuous wall, as much as possible parallel w 7 ith the fair 

 way. If it is made to enter too far into the river at the Southern end, 

 it would divert the scour from the frontage of " Ruimveldt " and 

 " Houston " and form a dead angle at its southern extremity. In the 

 immediate future, however, a line should be decided upon beyond which 

 no stellings ought to be extended. Along this line and to the west of it 

 a continuous deep channel should be dredged so as to allow of deep- 

 going ships to approach the stellings. The site at present occupied by 

 the Civil Engineer's wharf and adjoining lots would offer great advan- 

 tages for the construction of a basin for Mail Steamers. 



3rd. That the east Best groyne be extended from the end of the 

 stone w r ork due north to abreast of the groyne at the Fort, and then 

 curving gradually to the east till it lies in a direction 40 deg. E. of N., 

 and then in a straight line till it reaches 20 feet of depth at low water, 

 so as to lie scooping on the rising side. 



At Lusignan spit is at present forming, this seems to be the limit 

 of the slewing change of the channel to the east, and the proposed 

 direction of dam will leave sufficient room for the entrance to the fairway. 



