1:32] 80 
rach othci'. But to take tiie mean of these and the best section of Erie 
together, is perhaps a near approximation to the truth, viz: 
evaporation 
wide, deep, cubic ft. lockage, fittration. 
rhe canal de Hrlare, (6 miles,) 40 ft. 4 ft. sect. 128 uses 62.60 5.80 56.80 
riie canal ofLanj^uefloc,(69 miles,) 64 ft. 7h sect. 375 " 35.90 17.00 1890 
fhe canal du Centre, (69 mile?,) 47 ft. 5} sect. 215 " 55.60 9.74 45.86 
Thecanalof St.Quinlin. (32miles,)54ft. 5^ sect. 232 " 70.70 10.52 60.58 
'ifhe Erie canal (141 miles,) 40ft. 4 sect. 136 'M21.00 6.16 114.84 
414 348.78 
The whole expense of vvater per mi!e per minute, 69 
Tlie whole expense of water for evaporation and filtration per miuute, 58.13 
The above is for the summit levels, and the estimate of lockage is 
assumed proportionately for all, from the average of Languedoc, for 
silx yeai's, which w as found to be 1 920 boats a year. If, therefore, 
tlie locks on this canal arc 100 feet by 20 feet, and 8 feet deep, 
30,720,000 
16.000 X 1920= 
365 is 84 1,644 cubic feet per day of 1 2 hours, 
or 1169 cubic feet per minute; which, divided by the number of miles 
69, gives 17 feet per mile per minute; then, assuming that the others 
have proportionate lockage, and tliat these locks are of a size propor- 
tionale to their section, and the above deductions will be in accordance 
with Languedoc, leaving for evaporation and filtration aboveSS.l 3 per 
mile per minute. 
This average is much more favorable than the experience of Erie 
canal alone would have been, as it has been stated in the Ohio Com- 
missioners' report, as the answer of one of the Engineers to their 
inquiry, viz: 
That 61 miles of this canal, Rochester to Senaca, uses 6000 ft. 
11 the Camillus level, - - 2000 ft. 
69 the Rome summit, - - 9000 ft. 
141 tt. 17000 
Per mile per miuute, 120.57 
If the preceding calculation of the mean of the expense of water 
per mile j)er minute, is a near approximation to the truth, the ap- 
plication of it may be made to the lines of canal by considering, not 
only the summit level, but those levels which are successively, or 
alike dependent on the same source as one of the data of the esti- 
mate, and the lockage from the summit level as another. 
It is proper to take the longest line, in the first instance, sixty 
miles; especially as the passage of the Winding Ridge Ravine (not yet 
surveyed) is con.sidered very difficult: 60 x 58.13 = ft 3,487.800, 
