24 
Table I. 
Month. 
River Flow, Acre Feet. 
Rainfall, Av. in Inches® 
1891. 
1892. 
1891. 
1892. 
April. 
8,570 
6,450* 
1.60 
2.00 
May. 
75,090 
25,500* 
4.50 
4.00 
June. 
113,050 
86,750 
2.00 
2.50 
July. 
33,260 
45,300 
1.50 
0.75 
August. 
14,000 
11,550 
0.25 
2.00 
September. 
10,180 
6,000* 
1.00 
1.25 
October. 
7,350 
4,650* 
0.20 
0.15 
Totals, April 1—Sept 1. 
243,970 
175,550 
9.85 
11.25 
“ May 1—Sept. 1. 
2a5,400 
169,100 
8.25 
9.25 
“ May 1—Nov. 1. 
252,930 
179,750 
9.45 
10.65 
*Part of month estimated. 
^Average for whole valley. » 
The area supplied by the water measured at the gauging sta¬ 
tion is considered as 135,000 acres. The total acreage in the valley 
is slightly larger, but some is irrigated from the waters of the North 
Poudre, which is not measured at the gauging station. This acre¬ 
age is not exact, but is believed to be within 3 per cent. 
The totals at the bottom of Table I. sho’w the number of acre- 
feet which entered the valley for given periods; April to Sep¬ 
tember, May to September, and May to November. 
Dividing these totals by the number of acres, and reducing the 
rainfall to feet, we have Table II. Very little irrigation is given 
^ ill April, except to trees, but, as much water is run in reservoirs, it 
is included. The table shows that the rainfall during the periods of 
irrigation is equivalent to a large fraction of the water of the river. 
Table II. 
Depths in Feet over 135,000 Acres. 
Period. 
1891. 
1892. 
River. 
Rain. 
Total 
River. 
Rain. 
Total. 
April 1—Sept. 1. 
1.81 
0.82 
2.61 
1.30 
0.94 
2.24 
May 1—Sept. 1. 
1.74 
0.69 
2.42 
1.25 
0.77 
2.05 
May 1—Nov. 1. 
1.87 
0.79 
2.66 
1.33 
0.89 
2.22 
If all the water which passes the gauging station were applied 
to the 135,000 acres below that point, the land would have been 
covered to a depth of 1.74 feet, or 21 inches between May I and 
September I in 1891, and 15 inches in 1892. The rainfall during 
the same time would have increased this to over two feet in each 
case. 
