Description: These points are used to determine the width of Hazard Zones by interpolating the rate of shoreline retreat between the fixed determination points. For all determination points, except for some special situations listed below, there was no evidence of a change in the long-term rate of shoreline retreat. Therefore, the longest term historical erosion rates have been used. These will include short term fluctuations.
Special situations where these factors do not apply:
(i) Washdyke-Seadown coast and Waimataitai area;
(ii) South Brighton Spit;
(iii) Motunau;
(iv) Cliffed coastline in North Canterbury- Waipara to Haumari Bluffs;
(v) Sections of the Kaikoura coast bordered by the main road or railway.
Description: Coastal Marine Area boundary and the landward boundaries of Hazard Zones 1 and 2 within the Canterbury Region as shown in the Canterbury Regional Coastal Environment Plan 2005.
The Coastal Marine Area Boundary (CMA) along the line of Mean High Water Springs (MHWS) is indicative only. Environment Canterbury has defined Hazard Zones along the Region’s coast. Two zones are defined:
Hazard Zone 1 - This is a zone delimited by a line approximately parallel with the
shoreline, set inland from mean high water mark springs, which contains the current active beach system and land that is at risk from coastal erosion within 50 years of this Plan being produced.
Hazard Zone 2 - This is inland from Hazard Zone 1, and marks land that is at risk from coastal erosion in the period 50 to 100 years of this Plan being produced.
Description: Envionment Canterbury has defined two hazard zones along the coast. Hazard Zone 1 is a zone delimited by a line approximately parallel with the shoreline, set inland from mean high water springs,which contains the current active beach system and land that is at risk from coastal erosion of this Plan being produced. Hazard Zone 2 is inland from Hazard Zone 1, and marks land that is at risk from coastal erosion in the period 50 to 100 years of this Plan being produced.
Description: Sea water inundation is defined as the movement of sea water onto the hinterland behind the beach system. Sea water inundations are mainly confined to South Canterbury where approximately 1,000 hectares of land in the Waihao-Wainono, Hook-Makikihi and Washdyke-Seadown-Milford areas have been historically affected. Along the remainder of the region’s coast, sea water inundation problems have been reported at Rakaia-Taumutu, Leithfield, Amberley, and along sections of the Kaikoura Coast.