828 



NEW YORK STATE MUSEUM 



Mr Child's measurements were for a section of the canal 

 36.02 miles in length. On the Palmyra level, for a distance of 

 8.-34 miles, where the soil is open and porous, the measurements 

 showed a loss of 1.81 cubic feet per second per mile. On the 

 Clyde level with a more retentive soil the losses from nitration, 

 absorption, and evaporation were, for a distance of 27.68 miles, 

 only 0.59 cubic foot per second per mile. The entire loss, includ- 

 ing leakage, was, for the whole distance, 1.40 cubic feet per 

 second per mile. These measurements were made for a term of 

 thirty-three days, from July 30 to August 31, inclusive. Meas- 

 urements were also made in June, early in July, and in the fol- 

 lowing October, from which the conclusion was derived that 

 demands were greater and the supply less for the time during 

 which the foregoing observations were taken than during any 

 other portion of the season. 



Mr Barrett's measurements were made at various points on the 

 original canal between Pittsford and Lockport, and repeated each 

 day from July 17 to September 30, inclusive. They showed an 

 average loss for the whole period of 1.22 cubic feet per second 

 per mile. Assuming the same ratio of loss between Pittsford 

 and Wayneport, there resulted, for the entire distance of 122 

 miles from Lockport to Pit lock, an average loss of 1.12 cubic 

 feet per second per mile. Mr Childs states that an addition to 

 the foregoing quantity should be made as an allowance for 

 springs and several small streams entering the canal which 

 could not be measured. Making such additions he concludes 

 that 1.42 cubic feet per second per mile should be taken as the 

 total quantity consumed on the 122 miles of canal under con- 

 sideration, which is equivalent to a total of 173 cubic feet per 

 second. It is stated in the original reports that the supply of 

 water was ample for all the purposes of navigation during these 

 measurements. 



Comparing Mr Childs's measurements of 1841 with those made 

 by Messrs Jervis and Bates in 1824, one point of great practical 

 utility is strongly brought out, namely, as to the excess of loss 

 of water in new canals over those some time in use; thus Mr Bates 



