Figure 4.1: Annual maximum flow as a proportion of the mean annual flood for the Rangitaiki, Whakatane, Waioeka and Kaituna rivers in the Bay of Plenty from 1950-2000
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Annual maximum flood flows as proportion of the mean annual flood for the Rangitaiki, Whakatane, Waioeka and Kaituna rivers in the Bay of Plenty from 1950 to 2000 are related to the phase of the Interdecadal Pacific Oscillation. Graphs for each river show abnormally large floods during negative phases of the IPO, with annual maximum flood flows up to 2.5 or 3 times the mean annual flood. In the intervening positive phase (1978-1998) there were few large flood events where flood peaks in the four rivers were no larger than 1.25 to 1.5 times the mean annual flood.
