TBE TYPE >T TEE PAS AM A CASAL ^: 



dq)06ife. so that it can no -displaee the eartii particles wiiii whidi it 

 comes in contact in its i-assge nnder tihe dam. To make a con-riDciiig 

 estimate of tiie vohnne of nw in tiie porons snb-smface strata imder 

 the dam is almost out of le question, hecanse ihe eitait, chancer 

 and continnitT of these rtita can not he defimtdr ascertained, and 

 it win he diflBcnlt. if no: impGesibley to determine at what point 

 or points the water will mk fr?™ t^e lake aboTc iiie dam into 

 these layers. The en^lners ~ Therefore, do no better tiiam 

 make nnfavorahle assnnino:!^ __i determine "Hie maximum 

 water loss that may resiil: nder inch hypotheses. There is no proba- 

 bflitr that this will be sncl as to prove anbarrassing to the project 

 It is to be remembered in tis connection that nearly always, wiien a 

 subsurface flow in a river chnnel has beeai developed by the etmstme- 

 tion of a subsurface curtain c dam. the result in water output has beoi 

 disappointing. In other weds, the probability is t " ' --£ — 



will be over-estimated- Xevrtheless, the public seems ;o ^xz-ev: r- " : 

 assurance that ti»e canal wc£ is progressing a] . - - -r- 



ticularly as it now appears pDl>able that the cor: ~ " 



be more than double the amont named by the ..— - . __ . ::i m 

 comparing the cost of the tw types of canal. 



In the writers opinion. : may confidently be assrir. :*e 



dam can be constructed at btun. The situation at '. 

 fore, of minor importance in be further discussion of the 

 has again arisen: "Would i -ot still be wdl to change : 

 project and to complete the icavation to sea-level ? '' This q^iestion, 

 if it be again opened, will hve to be considered in the light of the 

 views of the experts whose opiions have been herein referred to. ' 

 light of the work already doc and the progress already made : :i 

 light of the experience on the qthmns during nearly five y?^~- - * ' :- 

 ive work, and in the light oi-uch additional facts and e::------- - 



mav be submitted bv the ensieers now about to rrarr for the is-_ r 



Jantiarv 25, 1909. 



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