14 
( bniparatuh BtaU rm ni of run-off and /</•- ajntatfan. 
year. 
Precipi- 
tation. 
Precipi- 
tation. -i 
Run-off. 
Runoff. 
Inches. 
22. 87 
L7.28 
lv-7 
16.86 
16.58 
16.72 
Inches. 
24.10 
17.07 
17.02 
16.99 
18.25 
16.42 
Inches. 
12.6 
6.3 
9.3 
6.6 
12.1 
16.0 
Per cent. 
52 

1 896 
37 
1897 
55 
1 S'lx 
39 

66 
L900 
97 
a Year ending October 31. 
It was found necessary to estimate the discharges for the months 
when no record was kept. These, being the months of least How. were 
easily determined. At the same time any error in the estimate affects 
the general result but little. In arriving at the conclusions given the 
discharges of other rivers in the State which had records covering the 
entire year were examined. As a result of such examination the gen- 
eral proposition may be stated that streams reach their minimum 
before the 1st of November, increasing thereafter slightly to Decem- 
ber, and thereafter the discharge is quite constant until the warm 
days in spring increase the now. 
The following tables of precipitation are furnished by the United 
State- Weather Bureau and are for the three stations of the district. 
The Longs Peak and Moraine stations are located well back in the 
mountains, the Moraine station having an elevation of 7.000 feet above 
sea level. This station, located on one of the branches which consti- 
tute the headwaters of the Big Thompson, is about 6 miles from the 
summit of the range, and, being so situated, gives a much better general 
average of rainfall on the watershed of the Big Thompson than either 
the Longs Peak station or the Waterdale station. Besides this, the 
observations cover nearly twice as many years. For these reasons, in 
estimating the run-off relative to the precipitation, the averages in this 
table have been used. The Waterdale station is located near Arkins, 
just inside the first range of low foothills, and these records are of 
most use in cases where the precipitation on the cultivated land is 
wanted. 
Precipitation for L<>n<js Peak station, Larimer County, Colo. 
Year. 
Jan. Feb. 
Mar. 
Apr. May. 
June. 
July. 
Aug. 
Sept. 
Oct. 
Nov. j Dec. 
Total. 
1 B96.... 
Inches. Inches. 
Inches. 
Inches. 
Inches. 
Inches. 
2.70 
.65 
1.50 
2.06 
1.09 
.80 
4.61 
3.60 
1.86 
2.94 
4. 32 
.51 
Inches. 
1.52 
2.95 
1.29 
1.53 
1.73 
.17 
Inches. 
1.10 
1.95 
.95 
.81 
.11 
1.93 
In < ■!,>.<. 
2.60 
1.05 
1.41 
.60 
2.50 
1.14 
Inches. 
0.50 
.37 
1.07 
1.60 
.02 
.44 
Inches. 
0.17 
.15 
.55 
.60 
.64 
.64 
Inches. 
1897.... 
1899.... 
1900.... 
6.65 
.78 1.25 
.24 
.54 1.16 
. 16 . B6 
3.17 
1.96 
3.01 
.35 
1.00 
1.45 
1.73 
1.18 
6.34 
1.21 
1.60 
■2.07 
.38 
.60 
16.91 
15.66 
15.76 
16.67 
13.93 
Mean 
.40 . <»3 L85 2.54 1.17 
1.47 2.97 i 1.53 
1.14 1.55 
.67 
.46 16.48 
