RESEARCH· ·1970·

B218
SURFACE WATER
TABLE 4.-Variation in regression coefficients of annual precipitation, in millimeters/year, with length of record
Station name
20 40 60
Length of record (years)
80 100 120 140 160 180
Adelaide, Australia _________ -5.37 -0.407 0. 211
Ban galore, India ___________ 3. 05 5. 23 . 988
Copenhagen, Denmark _____ 9. 39 2. 63 1. 15
Milan, Italy----___________ 10.6 4. 00 -1. 31
Portsmouth, Ohio ________ -- 1. 23 -2.30 . 450
St. Paul, Minn ____________ -5.28 . 0142 -2.30
-0.0729 -0.276
1. 11 . 376 -0. 0079
. 958 . 775 . 496 0. 314
-1.93 -. 746 -1. 19 -. 794 -0. 580 -0. 219
. 345 . 691 . 395
-1.27 -1.30 -. 645
conclusions by several investigators that trends .are not
generally apparent in runoff for streams in the United
States since about the turn of the century. A study by
Y evdjevich ( 1963) has indicated that runoff in Europe
and the United States inay be trend free since at least
1810.
There is strong evidence that temperature trends
exist. Temperature trends 1nay imply evapotranspiration
trends. However, observed tmnperature trends
have been sinall, about 1 °F over the 60-year period
1880-1940. The effects on runoff of such a small temperature
trend are probably not significant.
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