Bul. 1358, U. S. Dept. of Agriculture PLATE OWI 
F172820 
Fig. |.— ‘TANKING’ OPERATIONS INVOLVE EXPENSIVE EQUIPMENT 
Five fresno scrapers being used to widen and increase the height of an old dam by carrying up 
an inner bench of new earth, which is thoroughly packed by the work animals during the 
process 
F170421 
FIG. 2.—THE USE OF MASONRY OR CONCRETE DAMS FOR STOCK RESERVOIRS 
Is LIMITED BY THEIR HIGH CosT 
Such dams cost more than similar ones of dirt and are accordingly restricted to exceptionally 
favorable sites 
aie = rae 
