- 41 — 



to be dredged as may be seen from the following list : San 

 Francisco (129.000 M :; ). Peruchoverne (92.000), Pepeaji 

 (100.000), Chapicuy (272.000), Yuqueri Grande (25.000). 



With reference to the maintenance of the other bars, 

 which are formed by the change of the currenl according 

 to the different heights ofthe river as tor instance that of 

 the Cancha Seca (22.000), San Jose (50.500), Sombrerito 

 (6.300), Guaviyu (56.000), Yuqueri Chico (44.500), it is 

 believed that it will be necessary to dredge after each 

 greal rise of the river, about 60.000 M 3 , supposing that the 

 filling will represent a third part of the cube originally 

 taken out. Besides, it lias already been proved that for 

 maintaining the bars of «Banco Grande and Altos y 

 Bajos the working capacity of the suction dredger is one 



third more. 



It is therefore possible to assure that, with two suction probable cost or 



., -i • i the canalization. 



dredgers, the «C 11» and an other one ol those acquired 

 for the dredging of the Martin Garcia channels, it will be 

 perfectly feasible to attend the canalization of the river 

 Uruguay and to improve it, for which it will be only ne- 

 cessary to work the dredger during six months in the year. 

 which represents an annual expense of $ 36.000 national 

 currency. It might be observed that as the silting may 

 take place suddenly and as its removal by dredging takes 

 some time, the navigation in consequence might be interup- 

 ted during a longer or a shorter time after each How of 

 water. 



With respect to such an observation the answer would 

 be, that however suddenly the river falls, this always take- 

 place little by little from below to higher up river; lor ins- 

 tance, when the watermarks yet 2,40 meters at the gauge 

 of Concordia the river steamers have not enough water to 

 pass the «Peruchoverne;> bar. 



But this inconvenience has all the same been taken into 

 account and in order to eliminate it as far as possible the 

 marking of all the bad bars by alignements on shore, 

 where the coast allows to do so. has been adopted. 



By the aid of those signals which are if possible, elec- 

 ted out of the reach of the highest floods, the channel is 

 absolutelv lined out and even in case the buoys, which 



