| ArcGIS REST Services Directory |
| Home > services > Inundation_Extents_of_January_2018_storm_surge_event (FeatureServer) | | API Reference |
Surveyed Inundation Extents - vector point data which shows the surveyed inundation extent for the 4-6 January 2018 storm surge event. Post event data collection was undertaken by a variety of WRC EM field teams visiting townships where possible from Port Charles to Tararu and at Kaiawa/Miranda on the western Firth of Thames, combined with some anecdotal water level reports collected by Thames Coromandel District Council during their post-event inspections. Data collated and mapped by Waikato Regional Council (WRC). This data shows the significant amount of damage by inundation along the Thames Coast Road, as well as substantial impacts to residential (particularly at Waiomu, Te Puru and Kaiaua), and rural (Kaiaua/Miranda Coast) areas. Land elevations that the inundation affected varied across the area dependent on local topography and hydrodynamic effects. Surveyed debris/burnt pasture lines caused by inundation from the event varied in average elevation from RL 1.2 m on the southern Kaiaua/Miranda Coast to 3.0m across the Hauraki Plains. The maximum elevation of the surveyed inundation lines was at 5.7 m (TVD) at Ngarimu and Whakatete Bay, if accurately identified this is likely due to wave effects.
Apparent Inundation Extent - vector polygon data which shows the apparent inundation extent along the Kaiaua Miranda coastline as represented by pasture burn (dead pasture due to salt water inundation). Polygons were mapped by the Waikato Regional Council (WRC) Regional Hazards Team during a 'desktop' assessment of aerial imagery captured soon after the event using evidence of pasture burn as a proxy indicator of inundation extent. Where the pasture burn lines were unclear LiDAR (elevation) data and the surveyed inundation data was used to assist mapping. Apparent inundation extents have often not been mapped in built up areas due to the difficulty of identifying pasture burn in these areas.