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IRRIGATION EXPERIMENTS IN IDAHO. 51 
indicate that losses per square foot of wetted area are largely inde- 
pendent of the volume of water flowing in the canal, but that they are 
slightly influenced by the depth of water over the wetted area, and 
that the per cent loss per mile is greatly influenced by capacity where 
mh A 
» S S 
. NG 
0 ° y 
iN} 
e wn Colvce Feet per Seconda 
iD LOOT CAV FEIES 7. 
— A — — LOSS WW CUBYCLELT PEP? SQUHIE [O07 WETTED AREA ll 28AUPS PER SECOND (207) CHVFICITV. 
SCP AS 
Lt 
Lesth of Water tn Canal tr Feet. 
CEL 
COE 
PCE 
CO a 
BLAS 28D PLBALIZS 
quantities less than 200 second-feet are carried, but that with capacity 
in excess of 200 second-feet the percentage of loss is remarkably con- 
stant. Great care must be used in the designing of small canals to 
allow for a sufficiently large per cent of loss. 
—SELATION OF LOSS li CULE FEET PLE SQUARE FOOT OF WETTED AREA FO DEPTH O WATER WW CANAL. 
OS 
ELIT LOSS PLE PILE PER ECO. 
Fic. 13.—Effect of capacity of canal and depth of water on loss in per cent per mile and in cubic feet per square foot of wetted area. 
