I 
12 SEEPAGE OR RETURN WATERS FROM IRRIGATION. 
be reduced correspondingly. The amount found in these streams is 
here given in parenthesis (though not counted), and the effect can 
be easily seen. 
Without having determined the actual origin of the water in 
every case, it is believed that in no case is any of the water derived 
from above the ditches. 
§13. The diagram, Fig. 1, shows graphically the amount of 
return waters as found in the different measurements. The 
horizontal distances, or abscissae, give the distances in 
miles from the gaging station. The vertical distances, or ordi¬ 
nates, indicate the amount of return waters in cubic feet per second. 
The vertical lines are drawn at the principal points of measurement. 
The distances have been measured, not along the curves of the 
river, but on the map, taking generally a straight course across the 
bottoms, because it is thought that the amount of inflow will not be 
increased by the curves of the river, but rather will depend upon 
the straight course of the river, other things being equal. The 
different lines indicate the different measurements. It is 
evident that there is a general agreement between them. 
There are some marked exceptions, which it is difficult 
to entirely account for. The small amount of inflow in the first 
ten miles is noticeable in the eighth and ninth measurements, 
while in all previous ones it had been considerably greater. A 
decrease between the seventeenth and twentieth miles is noticed 
twice, and once between the seventeenth and thirty-second mile. 
Notwithstanding the minor discrepencies, there is a general 
agreement, especially during the last portion. It may be seen that 
the total inflow does not vary much. 
«/ 
Several of the measurements were not carried beyond the 
Ogilvy ditch, which is several miles from the north of the river, and, 
therefore, the values found are less than had they been continued 
to the mouth. 
§ 14. Table II. shows the rainfall in connection with the 
gaging, so as to give the means of judging as to the effect of the 
rainfall ot the previous and the current year upon the amount of 
inflow. The headings of the columns sufficiently indicate the 
quantities given. Thus, column 3 gives the amount of rain which 
fell during the calendar year up to the first of the current month 
of gaging, and the fifth column is the amount of precipitation 
during the month and previous to the time of gaging. There 
does not seem to be any particular connection between the wet 
and dry seasons and the amount of return waiters. 
4\ ith a high river, the amount of w y ater applied is more than 
when the river is low, because in the latter case there is stinting of 
water and much land does not secure enough for the needs of the 
crops, far less than enough to satisfy the owners; hence, we may 
