28 
tion of the Water Commissioner. The acreage using water from the 
different canals is to some extent uncertain, but during the last 
season, the acreage of the different crops underneath this canal was 
taken by Hon. A. L, Emigh and from the report of the Water Com¬ 
missioner, John L. Armstrong, to the State Engineer. The acreage 
is given as 5,407 alfalfa, 1,540 grasses, 29,547 other crops, almost 
entirely cereals and potatoes. Total, 36,494 acres. An area of 6,600 
acres is reported as irrigated by water from reservoirs and from 
seepage, which area is included in the above. 
From the daily gauge heights, the amount of water entering 
the canal during the period from May 1 to September 1, is as 
follows: 
Acre-feet. 
May. 11,248 
June.26,196 
July .10,896 
August. 745 
Total from canal.49,085 
Some water entered the canal both before and after this period, 
but the additional amount taken from the river does not appre¬ 
ciably affect the average depths applied, and perhaps should not be 
considered, inasmuch as but little of that which does enter outside 
of these months is used for irrigation. 
There is, however, a reservoir belonging to a company of 
farmers drawing their wnter from this canal. The reservoir being 
filled from other sources of supply than the canal, increases the 
depth of water applied correspondingly. The Terry Lake reservoir 
furnished some 5,500 acre-feet of water during the past season, thus 
making the total amount applied to the land 55,585 acre-feet approx¬ 
imately. The wnter from the reservoir was all used for late crops, 
principally potatoes, in late August. The corresponding duties, if 
water be considered to flow constantly during the periods as in the 
preceding tables, would furnish duties in acres per cubic foot per 
second, as in the following summary: 
Period . 
No. of 
Days. 
Irrigation. 
Irrigation and 
Rainfall 
May 1—Sept. 1.. 
123 
165 
109 
April 1—Sept. 1.. 
153 
205 
126 
May 1—Nov. 1. 
181 
216 
155 
June alone. 
30 
81 
61 
THE ULTIMATE DUTY OF WATER. 
A large amount of water is needed for carrying on the vegetable 
processes, and this must fix the ultimate duty to be expected from 
water even under the most economical methods. Ordinarily it may 
be estimated that for each pound of dry matter produced, three hun- 
