Name: 2011 ORC Alluvial Fan Areas

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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Eleven high hazard alluvial fans were identified from the twenty-seven areas studied in the</SPAN><SPAN> </SPAN><SPAN>supplementary investigation (Barrel et al, 2009).</SPAN><SPAN> The fans selected within this investigation do not necessarily represent those fans in</SPAN><SPAN> </SPAN><SPAN>Otago with the highest level of hazard rather; this subset has been selected based on</SPAN><SPAN> </SPAN><SPAN>existing and future development potential. </SPAN></P><P><SPAN>The eleven </SPAN><SPAN>Catchment A</SPAN><SPAN>reas chosen for this report are</SPAN><SPAN>:</SPAN></P><P><SPAN STYLE="font-weight:bold;">Queenstown Lakes: </SPAN><SPAN>Pipson Creek (Makarora), Flaxmill Creek (Makarora), Johns Creek (Hawea), Stoney Creek (Wanaka), Waterfall Creek (Wanaka), Walter Peak (Wakatipu), Bobs Cove (Wakatipu), Brewery Creek (Queenstown), Reavers Lane (Queenstown), Kingston Creek (Kingston)</SPAN></P><P><SPAN STYLE="font-weight:bold;">Central Otago: </SPAN><SPAN>Reservoir Creek (Roxburgh)</SPAN></P><P><SPAN>The field "AREA_TYPE" has been added to categorize the data based on the original layer from which it came (Catchment Area, Source Area, or Hazard Area).</SPAN></P><P><SPAN>The Source Area layer serves to identify the sediment source areas that supply sediment to the channels in each of the eleven alluvial fans. The data includes information about the type of sediment source (such as Primary Sediment Source, Upper Catchment Source Area, Schistose slides, etc.)</SPAN></P><P><SPAN>To determine the </SPAN><SPAN>H</SPAN><SPAN>azard </SPAN><SPAN>Area </SPAN><SPAN>of each alluvial fan, specific information was collated and acquired to gain an improved understanding of potential alluvial fan hazards. This information includes:</SPAN></P><P><SPAN>The extent of existing and potential catchment instability that may contribute significant sediment and/or debris supply to the fan surface.</SPAN></P><P><SPAN>The potential for debris dam formation and identification of existing landforms in the upper catchment that provide evidence for historical damming.</SPAN></P><P><SPAN>Vegetation characteristics of the catchment and potential for log-jam dam formation</SPAN></P><P><SPAN>The identification and mapping of palaeo-channels on the fan surface and the potential for these to be re-occupied through channel avulsion.</SPAN></P><P><SPAN>Observations of previous debris flow deposits, their location and potential for future debris flow by inspection of existing soil profiles to generally determine the frequency and derivation of events.</SPAN></P><P><SPAN>Observations of channel incision down the fan surface, the location of the hydrographic and topographic apices and key inflection points.</SPAN></P><P><SPAN>The potential for aggradation and lateral migration of active channels and the likely risk of avulsion.</SPAN></P><P><SPAN>The potential for significant erosion of existing channels and likely effects.</SPAN></P><P><SPAN>These </SPAN><SPAN>Hazard A</SPAN><SPAN>reas have been defined by combining active alluvial fan areas mapped by Barrel et al (2009), extending potential hazard areas using stereoscopic aerial photography and ground verification, and integrating the results of previous site specific investigations. It is important to note that these hazard areas represent the full extent of possible unmitigated future alluvial fan activity. Alluvial fan hazards will vary spatially within this boundary depending on the nature and characteristics of the storm event and fan surface at that time.</SPAN></P><P><SPAN STYLE="font-weight:bold;">Full report available here: https://qldc.t1cloud.com/T1Default/CiAnywhere/Web/QLDC/ECMCore/Rendition/GetFile?docId=3313634&amp;r=pdf&amp;h=qDY6TH9Zof&amp;t=1146791E&amp;rv=PDF_8_1_3_S3_099_00328FD7_00B_pdf&amp;rev=N&amp;ah=q9wIdZELqC&amp;suite=ECM</SPAN></P><P><SPAN /></P></DIV></DIV></DIV>

Service Item Id: e1c74c35ece341c8b0866dbde4cbd6d6

Copyright Text: Report: Otago Alluvial Fans High Hazard Fan Investigation (June 2011) Prepared By: Richard Woods, Natural Hazards Analyst (ORC)

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