Severe unprecedented flooding of unprepared and inexperienced communities adversely affects community health, but the effect of severe flooding on well‐prepared and experienced communities is less certain. An answer was sought for the New South Wales coastal town of Lismore. Parts are flooded every year with the last major flood occurring in 1974. Hospital admission and death certificates were analysed for the years before and after that flood. Using this data and information from an earlier survey two types of analysis were undertaken: a comparison of mortality and hospital admissions before and after the flood; and a comparison of health effects between different levels of flooding, including residents whose properties were located outside the flood plain. Although the flood did not appear to increase the number of hospital admissions or deaths, the ratio of male to female admissions showed a significant change. For those severely flooded, male admissions doubled while female admissions halved. Analysis of the data in relation to flood risk showed that for both pre‐and post‐flood periods hospital admissions were closely related to the degree of flood risk. Those whose dwellings were subject to a metre or more offloodwater over floor level are twice as likely to be admitted to hospital as residents of the flood free
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