Environmental Engineering Reference
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Figure 5.10 Correlation patterns associated with one-minute
rainfall rates in warm-season storms in Goose Creek, central
Illinois.
Source: After Huff and Shipp (1969).
central gauge (Figure 5.10). Thus at a distance of only 8 km from the central gauge the
rainfall pattern is different minute by minute; in many cases it may have been raining at
the central gauge but not 8 km away. This is what we would expect if rainfall was
produced by local summer convection storms, each affecting an area of only a few square
kilometres.
At a longer time scale the degree of correlation is better. Taking rainfall totals for
whole storms (Figure
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