sep:page or return waters from irrigation. 
11 
TABLE I. 
January. 
. 110 cubic feet per second. 
February . 
. 83 
u 
44 
ki 
44 
March. 
. 70 
u 
44 
u 
44 
April. 
. 237 
u 
44 
44 
44 
May. 
.1,245 
44 
44 
»4 
June. 
.2,017 
ki 
(( 
u 
44 
July . 
.1,018 
u 
ii 
ii 
ii 
August. 
. 362 
u 
u 
44 
44 
September. 
. 173 
i( 
44 
a 
44 
October. 
. 136 
44 
44 
44 
44 
November. 
. 81 
44 
44 
44 
44 
December . 
. 74 
*4 
44 
u 
44 
CONDITIONS AFFECTING ACCURACY. 
§ 12. The stream itself is subject to fluctuations, which, how¬ 
ever, are more noticeable at times of high water during the sum¬ 
mer than at low water, or at the times at which measurements 
were made. When the snow is melting rapidly the effect of the 
daily heat is to increase the quantity of snow melted and thus 
increase the height of water in the river. This makes a very per¬ 
ceptible daily tide, the hour at which it reaches the gaging station 
varying according to the stage of the river and the distance from 
which the water comes. When the water is low, the daily rise is 
later than when the water is high. With high water the greatest 
height occurs at from 4 to 6 o’clock in the morning; with a low 
stage of the river it may not be until toward evening. After the 
principal snow fields are melted the effect of tins daily tide is small, 
so as scarcely to be perceptible upon the self-registering instruments 
which are located at the gaging station. At the dates at which 
gagings have been made for the purpose of this investigation, the 
tide has been very small, the greatest in August, 1894, and has 
been neglected. Even if not, inasmuch as the greater portion of 
the river is taken into the canals betore many miles, the quantity 
of return waters found bv the measurements would not be affected 
t/ 
thereby. It is of small importance, as the greater quantity of the 
return waters has been found to be near the lower end of the river. 
Errors in gaging might introduce some errors in the results, 
but the relative values should remain the same. The meters, how¬ 
ever, have been rated in still water, and the constarits determined 
often enough to indicate that the constants have been nearly the 
same. The meter usually used has been the ‘‘ Lallie Meter,” made 
in Denver, Colo. Sometimes a meter made by Messrs. Buff & 
Berger, of Boston, Mass., has been used. 
The omission occasionally of some of the ditches draw¬ 
ing water from the stream would induce an error, but it is not 
believed that such an error has been committed. 
If a portion of the returns by the various creeks and sloughs 
were waste water instead of seepage water, the quantity found would 
