26 



Dredging work in 

 execution. 



Shoal of the San 

 Francisco island. 



Stretch of <Colon> 



and shoal of the 



limekiln ot 



<Colon>. 



Bar of Perucho- 

 verne. 



ca Chica>. 



San Francisco, where it has excavated a channel of 50 

 meters wide by a mean depth of 3 meters. When the sur- 

 face was levelled over the distance of 450 meters in which 

 the current is observed, a difference in level of 57 mili- 

 meters was found. For this reason it may be hoped that • 

 once this bar has been canalized, the improvement will 

 also be felt at the sand bank in consequence of the 

 greater slope, which will be established in this part of the 

 river. 



The dredging of the «San Francisco » bar which has been 

 authorized by decree of the 15th of June of this year (1901), 

 is now in execution. The channel will be 100 meters wide 

 by a depth of 9 feet at lowest river. Three buoys have been 

 placed to mark the old channel, but when the dredging has 

 been carried out, their number must be previously increased 

 to eight and completed by beacons in line on the Argentine 

 coast until luminous buoys are provided. 



Near the Oriental coast of the San Francisco island exist 

 a shoal which is visible when the river is very low, but 

 which presents no danger to navigation as it is situated 

 outside of the general route. 



With exception of a shoal situated on the Argentine coast 

 below the lime factory <Colon», which must be indicated by 

 a buoy, navigation hereafter meets with no difficulties 

 until arriving in front of O'Connor's slaughterhouse. 



A little above the mole of the slaughterhouse begins the 

 bad bar— formed by sand and gravel— of «Peruchoverne» 

 where there is only 5 feet of water when the river is very 

 low. 



The work to lie carried out here, consists in dredging 

 92.000 M 3 in order to form a channel with a section of a 

 width of 50 meters in the bottom by 9 feel depth when 

 the water marks /..to at the gauge. As has been stated 

 already before, this is the projected cross section for the 

 channels to be opened in the bad bars till arriving at Con- 

 cordia ( Sheel ./ ). 



Theprojected buoying consists in four buoys and a line 

 of beacons on the Argentine coast. 



Once the mentioned bar has been passed, the navigation 

 is easy, the depth being greal till arrr\ ing at the Boca Huca 



