This dataset is part of the proposed Marlborough Environment Plan. As part of the review, the extent of areas subject to flood hazard has been reassessed. Aerial photography of flood events has been used to more accurately identify the extent of floods and this information has been used as the basis for mapping within the MEP.
In addition, a level of risk has been assigned to areas with flood hazard, increasing from Level 1 to Level 4 as follows:
Level 1: Land that suffers flooding of shallow, low-velocity water in a flood event, with an
annual recurrence interval of 1 in 50 years
Level 2: Land that suffers flooding but the depth/velocity of the flooding is not well
understood or cannot easily be expressed relative to natural ground level, in a flood event
with an annual recurrence interval of 1 in 50 years, or land within 8 metres of any lake,
river or wetland
Level 3: Land that suffers flooding of deep, fast-flowing water in a flood event, with an
annual recurrence interval of 1 in 50 years, or land in the bed of any lake or river or in any
wetland
Level 4: Land that has the potential to suffer flooding of deep, fast-flowing water in an
extreme flood event that overwhelms stopbanks and other constructed flood defences.
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