50 



BULLETIN 339, U. S. DEPARTMENT OF AGRICULTURE. 



Table XXIV. — Seepage losses from canals — Continued. 



No. 



Aver- 

 age 

 width 

 of 



Area 

 water 



Wet- 

 ted 

 per- 



Dis- 

 charge 



at 

 upper 



Total 

 loss 

 in 



Length 

 of 

 sec- 



Loss 

 per 



Loss 

 per 



square 

 foot 



Loss 

 per 



Remarks. 





water 

 sur- 

 face. 



face. 



im- 

 eter. 



end of 

 sec- 

 tion. 



sec- 

 tion. 



ob- 

 served. 



mile. 



area 

 per 24 

 hours. 



mile. 









Square 

 feet. 





Second- 



Second- 





Second- 



Cubic 



Per 







Feet. 



Feet. 



feet. 



feet. 



Miles. 



feet. 



feet. 



cent. 





86 



68.1 



125 



68.8 



207 



8.4 



4.185 



2.0 



0.480 



1.0 



Clay loam, hardpan, lava 



rock. 

 Gravel and clay loam. 



87 



22.4 



67.7 



27.0 



214 



10.2 



3.090 



3.3 



2.001 



1.5 



88 



21.3 



97.5 



27.5 



242 



1.33 



3.530 



.38 



.224 



0.2 



Heavy gravel. 



89 



26.4 



91.6 



31.0 



243 



3.6 



1.920 



1.88 



.988 



0.8 



Compact clay loam. 



90 



21.0 



96.0 



28.8 



244 



.13 



3.500 



.04 



.021 



0.01 



Banks sandy. 



91 



21.9 



101.4 



30.8 



260 



10.0 



2.450 



4.1 



2.048 



1.6 



Very sandy sidehill. 



92 



24.8 



106 



33.0 



265 



3.4 



2.85n 



1.19 



.502 



0.4 



Sandy loam. 



93 



25.8 



107 



31.3 



270 



-2.0 



2.110 



.95 





0.4 



Cement gravel. 



94 



25.1 



113 



32.8 



272 



6.0 



2.440 



2.5 



1.227 



0.9 



Sandy loam. 



95 



31.3 



130 



36.0 



295 



13.6 



2.260 



6.0 



2.735 



2.0 



Porous gravels, evidently 



seepage. 

 Clay loam and lava. 



96 



68.0 



159 



70.5 



30S 



8.4 



3.870 



2.2 



.500 



0.7 



97 



68.0 



171 



70.3 



332 



24.3 



4.180 



5.8 



1.353 



1.7 



Clav loam, hardpan. 



98 



32.0 



122 



36.5 



333 



-.76 



2.620 



.29 





0.1 



Impervious clay loam. 



99 



Ch'k. 



Basin. 





344 



34.2 











Clay loam, hardpan. 



inn 



38.3 



142 



42.4 



420 



12.5 



5.840 



2.1 



.826 



0.5 



Gravel, sand, clay. * 



101 



Ch'k. 







476 



28.2 











Clay loam, hardpan. 

 Gain, gravel. 



in2 



53.'5 



265 



57.0 



760 



-4.0 



2.180 



1.84 





0.2 



103 



56.7 



288 



61.4 



783 



10.4 



2.260 



4.6 



1.227 



0.6 



Compact gravel and clav. 



104 



53.0 



290 



58.9 



788 



-12.7 



2.140 



5.9 





0.8 



Composite clay and clay 

 irrigated land above canal. 



105 



57.0 



316 



62.6 



832 



11.1 



2.060 



5.4 



1.408 



0.6 



Uniform clay loam. 



106 



60.0 



319 



64.8 



877 



20.9 



2.940 



7.1 



1.701 



0.8 



Do. 



107 









1,615 



108 



3.410 



31.7 





2.0 





108 









1,755 



126 



5.110 



24.7 





1.4 













rock. 



109 









1,870 

 1,890 

 2,006 



2,379 



108 



19.2 

 116 



13.5 



8.410 

 2.750 

 8.790 



4.390 



12.8 



7.0 



13.2 



3.1 





0.7 

 0.4 

 0.7 



0.1 





110 









Gravel, sidehill. 



111 









Clay loam creviced lava 



112 









rock. 



113 



104. 



784 



110.5 



2,737 



93.0 



5.350 



17.4 



2.574 



0.6 



Deep uniform clay loam. 



114 



107.3 



829 



114.3 



2,798 



30.4 



6.070 



5.0 



.719 



0.2 



Do. 



115 



107.5 



831 



114 



2,857 



27.0 



2.650 



10.2 



1.462 



0.4 



Do. 



116 









2,934 

 3,097 



54.0 

 148 













117 



118.0 



955 



123 



5. 050 



29.3 



3.899 



0.9 



Deep clay loam. 



118 



123.0 



. 984 



129 



3,192 



167 



3.350 



49.9 



6.324 



1.6 



Clay loam, underlain by 

 creviced lava rock. 



Table XXV shows the range of the losses to which the canals were 

 subject in per cent per mile and in cubic feet per square foot of wetted 

 area per 24 hours. 



Table XXV. — Range of seepage losses from canals. 



Minimum loss 



Maximum loss 



Average loss (109 sections) 



Per mile. 



Per cent. 



i -5.5 



58.3 



7.4 



Loss per 



square foot 



per 24 



hours. 



Cubic feet. 



C 1 ) 

 6.32 

 1.21 



i Gain. 



The effect of capacity and other factors upon the losses is shown by 

 the curves in figure 13, which are based upon all of the data secured 

 after eliminating the few sections which showed a gain. These curves 





