Table 2 Aggregated
annual weather
characteristics (2000–2016)
Min. Max. Average (Std. Dev.)
Total precipitation (mm/year)
407 954
631 (156)
Number of rain days per year (–)
81
124
100 (13)
Average daily precipitation (mm/day)
1.1
2.6
1.7 (0.4)
Maximum daily precipitation (mm/day)
36.0 110.8 62.1 (17.8)
Average daily temperature (°C)
17.0 18.1
17.4 (0.3)
Maximum daily temperature (°C)
37.4 41.8
40.0 (1.7)
Average daily potential evaporation (mm/day) 3.36 3.93
3.61 (0.15)
Maximum daily potential evaporation (mm/day) 9.82 7.31
8.52 (0.70)
Fig. 5 Annual variation in
total precipitation (a),
maximum daily precipitation
(b) and number of rain days
(c). Light blue colours
indicate the years prior to
reservoir construction
66
I. Fiebrig and M. Van De Wiel