12 
BULLETIN 675, TJ. S. DEPARTMENT OF AGRICULTURE. 
fact that area A received less than one-half as much rainfall as 
area B. 
The other 25 rainstorms of the year 1915, with the possible excep- 
tion of one or two in June, produced no run-off, because they were of 
a much gentler nature, so that the soil was able to absorb the moisture 
as it fell. Exception is made to certain storms occuring during 
June, since there was at that time a continual flow from the melting 
fTREClPlTATlONl 
WINTER 
SNOtf 
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5TREAM FLOW KSSffftfoftftftfififlfigS 1 
OO's ©* Cu.Ft 
.EROSION 
PRECIPITATIONI 
STREAM FLOWKSJ 
LEROSION □ 
PRECIPITATION f" 
'AREA- A iqi5< 
SUMMER 
RAINS 
STREAM now tSWVS 
Tmousrnds or C«.p«. 
3^^^^^^^H| 
AIM FALL - INC 
^WcHi 
^erosion l 
p'recipitationI 
5< 5tream flow i 
.EROSION 
PRECIPITATION 
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EROSION I 
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It 
Fig. 3. 
.EROSION I I 
-Erosion and run-off from melting of accumulated winter snow and from rainstorms. 
of snow on the areas. The effect of rainfall upon the stream flow 
during the presence of melting snow could not be ascertained. 
On July 4 a fall of 0.36 and 0.34 of an inch, respectively, were 
recorded from the two rain gauges on area A. and 0.43 and 0.40 of 
an inch on area B, over a. period of 3 hours and 25 minutes. This 
resulted in no run-off. On September 2 and 3 there was a fall of 
0.65 and 0.65 of an inch on area A and 0.62 and 0.63 of an inch on 
area B. covering a period, of 8 hours and 45 minutes. This produced 
no run-off. These latter two cases, in which the rain fell at an 
