# The sea’s reach

The district plan’s mapped tsunami inundation extent, 867 areas covering 4,435 hectares of low coast, estuary edge and river mouth, modelled by NIWA for Environment Canterbury. A modelled reach, not a prediction of any wave.

## The modelling

- ECAN Report R14/78 2014: 835 areas, 2,329 ha, NIWA
- ECAN Report R12/38 2012: 32 areas, 2,106 ha, NIWA

## The marked ways out
The council’s signed evacuation routes, 14 lines of road out of the reach. On the day the instruction is the answer, not the map.

- Ferrymead, Ferry Road (5.9 km)
- Heathcote Valley, Bridle Path Road - Tunnel Road (9.2 km)
- Kainga, Harbour Road - Kainga Road - Marshlands Road (15.1 km)
- New Brighton, Hawke Street - Pages Road (4.5 km)
- North New Brighton, Bowhill Road - Travis Road (3.6 km)
- Northshore, Beach Road - Mairehau Road (5.7 km)
- Redcliffs, Main Road - Ferry Road (10.6 km)
- South New Brighton, Bridge Street - Breezes Road (5.1 km)
- Southshore, Bridge Street - Dyers Road - Linwood Avenue (8.1 km)
- Southshore, Rocking Horse Road - Estuary Road - Bridge Street (5.2 km)
- Southshore, Marine Parade - Bridge St (7.4 km)
- Styx, Lower Styx Road - Marshlands Road (13.6 km)
- Sumner, Wakefield Avenue - Evans Pass Road - Summit Road (3.6 km)
- Wainoni, Towards city from Wainoni Road (3.0 km)

## The suburbs in the reach
By share of outline inside the mapped extent, a sampled join, so a sliver still counts.

- Southshore: 96% of the outline, 105 ha
- South New Brighton: 83% of the outline, 116 ha
- Ferrymead: 73% of the outline, 180 ha
- New Brighton: 65% of the outline, 265 ha
- Brooklands: 56% of the outline, 413 ha
- Spencerville: 52% of the outline, 147 ha
- Bexley: 46% of the outline, 100 ha
- Moncks Bay: 45% of the outline, 17 ha
- Te Onepoto Taylors Mistake: 44% of the outline, 8 ha
- Woolston: 27% of the outline, 147 ha
- Redcliffs: 24% of the outline, 45 ha
- Aranui: 17% of the outline, 39 ha
- North New Brighton: 17% of the outline, 35 ha
- Waimairi Beach: 17% of the outline, 21 ha
- Bromley: 14% of the outline, 109 ha

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Christchurch City Council open data, the DistrictPlanB service’s DPTsunamiInundation layer, the operative plan’s mapped inundation extent. The plan’s map, not the civil-defence evacuation zones, those are drawn wider, on purpose. A point’s own answer: https://www.chch.live/before · the rivers' flood history: https://www.chch.live/floods · the coast’s qualifying matters: https://www.chch.live/matters. The files: https://www.chch.live/tsunami.json · https://www.chch.live/tsunami.geojson · by suburb: https://www.chch.live/suburb-tsunami.json