Groundwater Modelling

Groundwater modelling is a powerful tool for:

  • Studying the effects of proposed groundwater takes such as irrigation supply
  • Predicting the effects of ground water mounding
  • Studying water quality effects from waste water disposal or soakage and contaminated sites

Our past projects include:

Ruakaka Wastewater Disposal Impact Assessment - Developed numerical model (Visual MODFLOW) to assess the effect of discharge of wastewater to the coastal dune system on the stability of the beach and sustainability of the foredune. Designed and executed field investigations of soil hydraulic properties.

Maketu High-Rate Irrigation Model Study -developed models of groundwater flows (Visual MODFLOW-SURFACT; FEFLOW) and phosphorous sorption (VS2DT) associated with a proposed land disposal system for discharge to ground of treated wastewater.  Estimated capacity for P removal and indirect discharges to the surface environment. 


Omaha South Impacts Study - investigation of potential impacts of a residential development on the long-term viability of the shallow groundwater lens underlying a remnant stand of kahikatea forest-wetland on national significance.  Developed and tested conceptual model of the groundwater flow regime.  Prepared and presented evidence in support of consents applications.

Patumahoe ICMP Study - conceptual models for assessments of impacts of residential development on the groundwater resources associated with the village community of Patumahoe, Franklin District.  Prepared as part of an Integrated Catchment Management Plan study. 

Proposed Quarry - Impact Assessment - developed groundwater flow model (Visual MODFLOW) of a proposed quarry to determine potential impacts on groundwater flows and spring flows to adjacent rivers.

Mangakura Groundwater Submissions - critical review of groundwater take application and alternative assessment of resource impacts on behalf of affected parties.  Presentation of evidence to Commissioners’ hearing and to Court of Appeal; assisted with negotiated settlement.

Karaka North Groundwater Investigation - Investigation of groundwater flows in the vicinity of Karaka North (Franklin District) and development of resource model in support of an assessment of effects for a proposed increase in groundwater take by a major poultry abattoir.

Groundwater Resource Modelling - Developed custom applications software for groundwater resource modelling; studied local and regional groundwater contours to determine effects of extractions on other uses and long-term effects on the resource.

Whitford Landfill Groundwater Study - Developed conceptual model of groundwater flows beneath and around an existing sanitary landfill; assessed impacts of proposed extension of the landfill life and changes to operating practices.

For furthur information on Groundwater Modelling, please contact Voss Consulting today.