Parent Layer: Ground Stability

Name: Soft Ground

Display Field: SOFT_CODE

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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Data created as part of GNS report 2010/81.</SPAN></P><P><SPAN>TRIM ref RDC-154258</SPAN></P><P><SPAN>Description that was added to the maps:</SPAN></P><P><SPAN>Zone A: Areas of volcanic-derived rocks and soils. Volcanic processes by their very </SPAN></P><P><SPAN>nature are high-energy. No soft ground is expected in zone A as the dominant </SPAN></P><P><SPAN>processes preclude the conditions necessary for its development. </SPAN></P><P><SPAN>Zone B: Huka Group sediments and Hinuera Formation. These sediments were formed in </SPAN></P><P><SPAN>a range of environments. Sediments with soft and very soft strengths at the time </SPAN></P><P><SPAN>of formation have consolidated over time and are now likely to meet the </SPAN></P><P><SPAN>requirements for being defined as good ground as per the draft New Zealand </SPAN></P><P><SPAN>Standard for timber framed buildings (DZ3604). </SPAN></P><P><SPAN>Zone C: Undifferentiated Holocene alluvium. Sites from a range of environmental </SPAN></P><P><SPAN>conditions are present within this zone. Small areas of soft to very soft ground </SPAN></P><P><SPAN>may be present as a surficial layer in some places. </SPAN></P><P><SPAN>Zone D: Sites of Holocene (last 10,000 years) swamp deposits and Holocene lake or delta </SPAN></P><P><SPAN>sediments between the 9000 ka and modern shorelines. Four of the five </SPAN></P><P><SPAN>documented sites of soft ground (Fitchett, 2007; Phillips, 2009; and Cowbourne </SPAN></P><P><SPAN>2009, 2010) are located at sites mapped as Zone D. </SPAN></P></DIV></DIV></DIV>

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• Value: Areas of volcanic-derived rocks and soils. No soft ground is expected in zone A as the dominant high-energy volcanic processes preclude the development of soft to very soft soils.
  Label: A: Areas of volcanic-derived rocks and soils.
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• Value: Huka Group sediments and Hinuera Formation (older sediments). These sediments were formed in a range of environments. Sediments with soft and very soft strengths at the time of formation are likely to have consolidated over time.
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• Value: Undifferentiated Holocene alluvium (<10,000 years old). Sites from a range of environmental conditions are present within this zone. Small areas of soft to very soft ground may be present as a surficial layer in some places.
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• Value: Holocene (last 10,000 years) swamp deposits and Holocene lake or delta sediments between the 9000 ka and modern Lake Rotorua shorelines. Four of five documented sites of soft ground in the Rotorua district are located in Zone D.
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