Description: Rule used to identify high hazard areas:Either: - the water depth is greater than 1 m, or- the water depth (in metres) x the water velocity (in metres per second) is equal to or greater than 1.High rainfall hazard areas were identified using the two raster: SD_500_8p5_WD (depth) and SD_500_8p5_HZ (depth*velocity)(Location: ArcGIS 10.9.1 SD\Feature\geodatabases\DHI_RainOnGrid.gdb; Source: DHI New Zealand) High river hazard areas were identified using the two raster: FINAL_500yr_ARI_Q_1000cumecs_MAX_VEL0.asc (depth) and FINAL_500yr_ARI_Q_1000cumecs_MAX_DEP0.asc (velocity) (Location: Flood 200yr_500yr\Additional Data_SelwynRiver_ECan\FINAL_500yr_ARI_Q_1000cumecs; Source: ECAN)More information can be found at: https://apps.canterburymaps.govt.nz/SelwynNaturalHazards/or the following reports: Selwyn River / Waikirikiri Floodplain Investigation and DHI Water and Environment Ltd report – Regional Policy Statement Modelling for SDC – District Plan
Description: Hi Helen.I’ve createda layer package of the coastal inundation file that I’ve created for the Selwyn District. Essentially, I’ve mapped the area within the Selwyn District which is below the 4m above MSL contour, and used the Lyttelton 1937 Vertical datum for this, and have used the NZGD 2000 Transverse Mercator projection as the horizontal coordinate system. I’ve also attached Environment Canterbury’s standard terms of use for the data. Please get in touch with me if anything doesn’t work or if anything needs clarifying.Kind regards,Bruce.Bruce Gabites <bruce.gabites@ecan.govt.nz>