( 868 ) 



no change will occur in the gradient of the high and low water lineè, 



nor in 1 he velocity of the current in the remaining pail of the canal. 



As sooji as (he amplitude of the tides exceeds that of springtide 

 the inclination and the velocity of the current will be somewhat in- 

 creased for the wider part, somewhat diminished for the remaining 

 part, as compared with what they would be without the widening 

 of the first part and without the addition of a lake. In the case of 

 a smaller amplitude of the tides the reverse will occur. 



Owing to the situation of the ground the junction of the widened 

 canal with the lake must be made at a distance of about 12 K.M. 

 from the Pacitic terminal of the canal. Not before 3 K.M. farther 

 however, that is not before 15 K.M. from the sea, the surface of 

 the lake reaches a considerable breadth. Therefore if the inclination 

 of the high and low water line- remains nearly unchanged and if, 

 according to the most recent project, the length of the canal is 

 tixed at about 80 K.M.. the amplitude of the tide in the lake may 

 reach (5.06 — 15 X 0.0632) M. = ± 4.10 M. 



With such an amplitude a mass of water may be received, in 

 the interval between high and low water, of 800 X 10.000 X 4.10 M\ 

 = 32,800,000 M\ 



Assuming, as an approximation, that this mass is received within 

 a period of six hours, we find that on mi average 1500 M\ will be 

 received per second. 



The surplus width of the pari of the canal near the Pacitic must 

 be determined in such a way, therefore, that on an average 1500 M*. 

 may be displaced — without increase of the velocity of the current — 

 in excess of what might be displaced if the width remained normal. 



It is not well possible, without elaborate computation, to tix accu- 

 rately the surplus width necessary for the purpose. But it is easily 

 seen that this surplus width must be about 100 M. so that a bottom- 

 width of 150 M. might be given to the widened part extending 

 from the entrance of the canal to the junction with the lake. Corre- 

 sponding therewith the width at the spring tide level would be 

 about 250 M. At K.M. 64 this width might gradually be reduced 

 to the normal width. 



It will be possible therefore to remove eventual difficulties offered 

 by considerable velocity of the current on the part of the canal 

 nearest the Pacitic, by increasing the bottomwidth of this part. 

 (16 K. M. in length). 



Now let us consider how the case stands for the remaining part 

 of the canal, 64 K. M. in length. 



