seepagp: or return waters from irrigation. 
7 
In gaging the river at the regular gaging station, which 
is at a point in the Canon above the lieadgates of all the principal 
canals, a tape is stretched across the river between points on the 
masonry side walls and the depth of the water at each one-foot or 
two-foot interval measured throughout the entire width, which is 
very nearly 100 feet. Then observations were taken with the cur¬ 
rent meter, usua»lly at two-foot intervals, sometimes at less, across 
the stream. As most of these gagings were made at a time of low 
water in the spring, or low water in the 1‘all, the meter has been held 
by hand and the gager has waded the stream. At other noints 
the river where gagings were made the method le_ 
ally the same, although the cross-sections ha^|||H|P^^^oen essenti- 
able as at the gaging station. It is not^^|j|^B^^^ot been as favor- 
material error has crept in from however, that any 
measurements some individualji^^^^^^^^^'-^^^‘^‘‘^- hi the notes on the 
»urces of error are noted. 
description of the POU] 
§ 8. The measi] 
dre river and also o 
is the river which 
College is locatei^ 
purpose of this 
vantage of bein 
one which has 
irrigation has 
any part of tj 
of land irri 
phenomena 
gation on 
LE VALLEY, IN WHICH THE MEASUREMENTS 
WERE TAKEN. 
rements have been made on the Cache a la Pou- 
the South Platte. The “ Poudre,” as it is called, 
drains the valley in which the State Agricultural 
and is, therefore, the most easy of access for the 
^nd similar investigations. It has the additional ad- 
one of the largest irrigation streams in the State, and 
been the best used for irrigation purposes, and where 
been carried on as completely and successfully as in 
e United States. There is in addition as large a body 
^ated in one tract as anywhere in the United States. The 
observed are, therefore, found under conditions of irri- 
large scale. They are of great economic importance to 
, and may be expected to hold true of other valleys under 
conditions, and where irrigation has been practiced as 
t has here. 
e map in the inset [page 16] is intended to give an under- 
g of the conditions which may affect the return waters in 
Iley. The gaging station is indicated near the left of the 
elow the junction of the north Poudre with the main stream, 
only canal above this point which needs consideration is the 
h Poudre canal, shown on the map, irrigating some 4,000 acres, 
fcipally in the valley of the Box Elder. 
The main trend of the valley is to the southeast. Near the 
tream the land is low, the bottom land varying in width from one- 
lalf to two miles. These bottoms have been occupied in times past 
by the bed of the stream, which is subject to shifting at times of 
high water. With the decrease of floods, and with the use of wate 
for irrigation, the changes are less. 
this valle 
similar 
long as i 
Th 
standi 
this V 
map 
The 
Nor^ 
prin 
