Description: The potential coastal erosion area file effectively shows an area of where we think the coastline of the Selwyn District could be within in 2120 if various rates of change occur for the next 100 years.The horizontal coordinate system is the NZGD 2000 Transverse Mercator projection and I don’t think these layers contain height information, but if they do, they’ll be above the Lyttelton 1937 Vertical datum.
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>
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN><SPAN>Rule used to identify high hazard areas:</SPAN></SPAN></P><P /><P><SPAN><SPAN>Either: </SPAN></SPAN></P><P><SPAN><SPAN>- the water depth is greater than 1 m, or</SPAN></SPAN></P><P><SPAN><SPAN>- the water depth (in metres) x the water velocity (in metres per second) is equal to or greater than 1.</SPAN></SPAN></P><P /><P><SPAN><SPAN>High rainfall hazard areas were identified using the two raster: SD_500_8p5_WD (depth) and SD_500_8p5_HZ (depth*velocity)(Location: </SPAN></SPAN><A href="\sdcgisdata\ArcGIS 10.9.1 SD\Feature\geodatabases\DHI_RainOnGrid.gdb" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>ArcGIS 10.9.1 SD\Feature\geodatabases\DHI_RainOnGrid.gdb</SPAN></SPAN></A><SPAN><SPAN>; Source: DHI New Zealand) </SPAN></SPAN></P><P /><P /><P><SPAN><SPAN>High river hazard areas were identified using the two raster: FINAL_500yr_ARI_Q_1000cumecs_MAX_VEL0.asc (depth) and </SPAN></SPAN></P><P><SPAN><SPAN>FINAL_500yr_ARI_Q_1000cumecs_MAX_DEP0.asc (velocity) (Location: Flood 200yr_500yr\Additional Data_SelwynRiver_ECan\FINAL_500yr_ARI_Q_1000cumecs; Source: ECAN)</SPAN></SPAN></P><P /><P><SPAN><SPAN>More information can be found at: https://apps.canterburymaps.govt.nz/SelwynNaturalHazards/</SPAN></SPAN></P><P><SPAN><SPAN>or the following reports: </SPAN></SPAN><A href="https://www.ecan.govt.nz/data/document-library/?Search=PU1C%2F8608" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>Selwyn River / Waikirikiri Floodplain Investigation</SPAN></SPAN></A><SPAN><SPAN> and </SPAN></SPAN><A href="https://www.selwyn.govt.nz/__data/assets/pdf_file/0014/324131/DHI-Regional-Policy-Statement-Modelling.pdf" STYLE="text-decoration:underline;"><SPAN STYLE="text-decoration:underline;"><SPAN>DHI Water and Environment Ltd report – Regional Policy Statement Modelling for SDC – District Plan</SPAN></SPAN></A></P><P /></DIV></DIV></DIV>