- 33 



LAYMAN - CURVE. 



The delays the steamers suffer when going up river, 

 may cause them to arrive a1 the «Hervidero» bar after dark, 

 obliging them to anchor till the following day, losing by 

 doing so one niiilii. not to mention the losses and annoyan- 

 ces caused to the passengers. 



On the other hand it is very difficult to anchor buoys in 

 this part ol'the river in consequence of the nature of the river 

 bed and of the strong current— 3 meters per second— when 

 the river is high ; and if this were to be attempted at Leasl 

 30 meters of chain are required, the result being that in pe- 

 riods of low water those buoys could not indicate the chan- 

 nel with sufficient exactness. 



For all those reasons the channel has been proyected in 

 the center ol'the river and it will be indicated by direction 

 lines on the shore. 



The rocky bar of «Hervidero», is mainly formed by loose 

 stones, of an averaye weight of one ton, which can be easily 

 extracted with Priestman's excavators. The quantity to be 

 removed is about 19.000 m 3 . 



After having passed the last shoal of the Hervidero», 

 navigation, in the curve formed by the river is easy, till the 

 mouth of the arroyo «Yuqueri Chico» is reached (Sheet B). 



A little above this arroyo the bar carrying the same name Yuqueri chicobar. 

 is met with, which owes its existance to the little elevation of 

 the shoals and the concavity formed by the river ( Sheet A ). 

 The bottom consists of gravel and the cube to be dredged is 

 44.ol)() cubic meters. This dredging must be completed by 

 establishing a direction line of beacons, to be erected on the 

 Argentine coast, and 4 buoys.- 



Navigating in the center of the river there is sufficient 

 depth for the river steamers till arriving at the mouth of the 

 arroyo Yuqueri Grande». 



In front of the mouth of said arroyo begins the bar of 

 « Yuqueri Grande», a shallow place formed by gravel and 

 remains of stones which the current brings down from the 

 «Corralito» bar ( Sheet A ). 



Two directions for a channel have been studied, the first 

 one in a straight line, forming the prolongation of the chan- 

 nel projected in the rocky bottom of the «Corralito» bar 

 (Sheets A and A' ) and for which a cube of 51.000 m. 3 



Bar of Yuqueri 

 Gran 1 • 



