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Chapter 10:Hazard Analysis—Floods
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<br /> Figure 10-3. Historical Stream Flooding Events for Hawaii Island.
<br /> Sotu'ce: Fletcher,C,B.Richmond,E.Grossman,A.Gibbs,Atlas of Natural Hazards in the Hawaiian Coastal Zone,Pre-
<br /> pared in cooperation with University of Hawaii,State of Hawaii Office of Planning,and National Oceanic and Atmospheric
<br /> Administration,U.S.Geological Service Geologic Investigations Series I-2761,2002.
<br /> FEMA DR-1398-HI November 2000
<br /> A severe flooding event occurred in November 1-2, 2000 from prolonged intense rainfall
<br /> concentrated in two distinct areas, Waiakea and Kapapala (over 30 inches), with lesser
<br /> rainfall in most of East Hawaii (5 to 25 inches). The resulting flood damage to homes,roads,
<br /> bridges, businesses, and farms totaled in excess of $70 million, among the highest totals
<br /> associated with flooding in the State's history. Four meteorological and topographic
<br /> conditions simultaneously converged to cause the extreme nature of the storm: 1) the
<br /> upslope topography of eastern Hawaii, 2) the location of a large upper level trough, 3) the
<br /> pattern of southeasterly trade winds, and 4) the location of the remnants from tropical storm
<br /> Paul. Although maximum 1-hour rainfall totals were not extreme (recurrence interval of 1 to
<br /> 2 years, except for Kapapala Ranch and Hilo Airport gages at 5 to 10 years recurrence
<br /> interval), the severity was in the prolonged nature of the storm with a recurrence interval for
<br /> a 24-hour period equal to or in excess of 100 years at several rain gages. The recurrence
<br /> interval for peak stream discharges determined from stream gage data ranged from 50 to 100
<br /> years for streams south of Wailuku River in the Waiakea area; the majority of remaining
<br /> 10-5 Hawaii County Multi-Hazard Mitigation Plan
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