Heavy or extreme daily rainfall can result in increased
storm water runoff or flooding. This can lead to
transportation of more contaminants into drinking water
resources, overloading of storm water and wastewater
systems which might force additional funds to be sought
to augment management facilities, and can also pose
design challenges on structures such as dams. Rainfall
records have been used to assess the characteristics of
heavy daily rainfall in terms of its intensity and the
number of days with these events over the eastern
Botswana. This is crucial in addressing increased storm
water runoff or flooding concerns. All the stations that
have been selected for analysis experienced heavy daily
rainfall of at least 50 mm. The highest heavy daily rainfall
events across the stations ranged between 125 and 171
mm. Three of the seven stations had increasing trends in
the intensity of their heavy daily rainfall, two had
decreasing trends, while the other two did not show a
clear direction of the trend. The Mann Kendall test
indicated that only one of the seven stations had a
statistically significant trend at the standard 5%
significance level. On annual basis, the highest number of
days with heavy daily rainfall events at the stations was 5.

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