26 
ages for the whole watershed area, because observations were recorded 
at but two or three stations. In 1885 the number of stations was in- 
creased to seven and these were distributed quite widely over the water- 
shed: so the averages shown in Table 6 for the period subsequent 
to 1885 are considered more reliable than those for the earlier years. 
Table 7. — Maximum, mean, and minimum annual precipitation for subdivisions 
of the watershed (see fig. 5) for period 1892 to 1919. 
Watershed. 
Maximum. 
Mean. 
Subdivision. 
Area 
(square 
miles). 
Year. 
Depth 
(inches). 
Volume 
(bil- 
lions of 
cubic 
feet). . 
Depth 
(inches). 
Volume 
(bil- 
lions of 
cubic 
feet). 
Minimum. 
Year. 
Depth 
(inches). 
Volume 
(bil- 
lions of 
cubic- 
feet). 
1 
2 
3 
4 
5 
6 
7 
1 and 2 above Fargo 
and Moorhead .. 
1 to 5 above Grand 
Forks. 
1 to 7 above interna- 
tional boundary . 
4, 225 
2,210 
9,815 
4,185 
5,320 
G,275 
3,865 
6,435 
25,755 
35,895 
1916 
1906 
1905 
1896 
1896 
1896 
1904 
1916 
/ 1916 
\ 1896 
J 1S96 
\ 1916 
35.2 
32.5 
27.7 
22.2 
31.6 
24.5 
25.1 
34.2 
27.8 
27.2 
26.5 
25. 72 
345.3 
166.6 
632.3 
215.8 
391.1 
356.6 
225.6 
511.9 
1,661.2 
1, 628. 3 
2, 209. 8 
2,144.8 
24/2 
21.8 
21.3 
17.3 
24.0 
13.0 
17.7 
23.4 
21.7 
20.-8 
238.3 
111.5 
485. 5 
168.4 
296.9 
27&. 1 
158.9 
1910 
1910 
1910 
1917 
1917 
1917 
1897 
349.8 i 1910 
1,300.6 1910 
1,735.6 1910 
13.6 
133.3 
13.1 
- 67.2 
11.4 
260. 2 
11.8 
114.6 
12.2 
151.1 
12.1 
176. 1 'f 
10.3 
92.6 
13.4 
200.5 
12.2 
730.9 
12.3 
1, 029. 5 
Figure 6 shows the amount and distribution of the annual pre- 
cipitation for 1896, which is the } T ear of greatest precipitation from 
1885' to 1919, inclusive. Table 7 shows the maximum, mean, and 
minimum annual precipitation for the seven subdivisions of the 
watershed shown in figure 5, also like quantities for the watersheds 
aboA T e Fargo, above Grand Forks, and for the entire area south of the 
international boundary. 
The maximum precipitation over sub-areas 4, 5, and 6 occurred in 
1896, the year in which the precipitation was maximum over the 
whole watershed. In 1916 occurred the maximum on sub-area 1, on 
subareas 1 and 2 combined (south of Fargo and Moorhead). and on 
the watershed above Grand Forks which comprises sub-areas 1 to 5, 
On subarea 2 maximum precipitation occurred in 1906; on No. 3, in 
1905 : and on No. 7, in 1904. The precipitation on large portions of 
the watershed during the first six months of 1916, and during the last 
six months of 1909. was considerably above normal and caused ex- 
cessive run-off. Figure 7 indicates the total precipitation for these 
half-year periods. This combination year was used later in com- 
puting run-off. The total, however, does not exceed the 1896 precipi- 
tation (fig. 6) except on the small area south of Red Lake which was 
covered by the storm of July 20-22. 1909. 
The distribution of the mean annual precipitation for the entire 
watershed is indicated on figure 8. This map was prepared by 
