Coastal Otago Flood Event 3 June 2015
Coastal Otago flood event 3 June 2015 Otago Regional Council Private Bag 1954, Dunedin 9054 70 Stafford Street, Dunedin 9016 Phone 03 474 0827 Fax 03 479 0015 Freephone 0800 474 082 www.orc.govt.nz © Copyright for this publication is held by the Otago Regional Council. This publication may be reproduced in whole or in part, provided the source is fully and clearly acknowledged. ISBN 978-0-908327-19-4 Report writers: Michael Goldsmith, Manager Natural Hazards Jean-Luc Payan, Senior Investigations Engineer Rebecca Morris, Groundwater Scientist Chris Valentine, Manager Engineering Scott MacLean, Manager Operations Lu Xiaofeng, Resource Scientist Hydrology Nineva Vaitupu, Senior Environmental Data Officer Ben Mackey, Natural Hazards Analyst Reviewed by: Michael Goldsmith, Manager Natural Hazards Published October 2015 Coastal Otago flood event 3 June 2015 i Overview A low-pressure system to the southeast of the South Island brought heavy rainfall to coastal Otago on 3 June 2015. This report summarises that rainfall event, the observed river flows and water levels that resulted from the rainfall, and describes the Otago Regional Council’s (ORC) response to the situation. The situation is compared with previously observed events, including April 1923, March 19291, and April 2006.2,3 The report includes details of the effects on South Dunedin and the relationships between sea level, rainfall, groundwater and surface-water levels. Although the highest-rainfall totals were observed in and around the Dunedin City urban area, the event was reasonably widespread, also affecting the Waitaki, Clutha and Central Otago districts. In Dunedin, the rainfall totals were reasonably uniform across the main urban area.
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