Why was a flood hazard assessment done? - Mangaroa River Valley was identified in early 1990's as an area where further development was likely
- Subdivision of rural properties into rural-residential properties is taking place
- To determine the flood and erosion hazards associated with various areas of land in the valley
- To ensure new development is wisely located and avoids identified hazards
- Residents are aware of the risks and hazards associated with their land and environs
What the flood hazard assessment covers: - Hydrological study
- River and tributary channel survey for the area of hydraulic model
- 1D/2D model of the Mangaroa River, tributaries, and floodplains
- Mapping the flood extent, depth and velocity on the floodplain
- A high level assessment of potential damages to houses, residential development and infrastructure on the floodplain.
- Definition and mapping of river and floodplain hazard zones (flood and erosion)
- Brief documentation of previous and existing work related to the Mangaroa River, its tributaries and the floodplain
- Identification of critical water levels for flood warning
- Summary of generic planning provisions
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