64 BULLETIN 126, U. S. DEPARTMENT OF AGRICULTURE. 
Complete cost of material, mixing and placing concrete for form work 
only, per cubic yard $8. '50 
Same without forms 7 50 
Cost of rock excavation (light cuts from 0.4 to 2 feet), per cubic yard. ... 5. 00 
Cost of placing riprap 1 foot thick, per cubic yard 2. 00 
Total cost of preparing 8,400 linear feet of canal for concrete 75, 000. 00 
Gross cost of lining 8,400 linear feet of canal 200, 000. 00 
Average cost of concrete, per cubic yard 8. 00 
MAIN SOUTH SIDE, OR NEW YORK CANAL, UNITED STATES RECLAMATION SERVICE, 
BOISE, IDAHO. 
This canal is designed essentially to carry flood water from a point 
on the Boise River 9 miles above Boise to the Deer Flat reservoir, a 
Fig. 
-Showing method of setting forms on slopes for placing concrete lining in Main South Side, or 
New York Canal, U. S. Reclamation Service, Boise, Idaho. 
distance of 36 miles. Seventy thousand acres of land is also watered 
from the canal before the reservoir is reached. About 6| miles of 
the canal was lined to prevent seepage, increase the carrying capacity, 
and for the safety of sidehill sections where breaks frequently occurred. 
The canal is an old one, originally built with side slopes of 1J to 1, 
but the change and filling up of the section common to old canals 
necessitated considerable preliminary work in the removal of very 
gravelly earth and in shaping the sides before the concrete could be 
laid. The lined section has a grade of 0.00025 to 0.00032 and slopes 
of 1^ to 1. Forms of 4 by 4 inch lumber were placed upon the slopes 
and aligned, as may be seen in figure 6, after which the surface 
