1. Department of Groundwater; Institute of Environmental Science and Research Ltd; Porirua 5240 New Zealand
2. National Centre for Groundwater Research and Training; Flinders University; GPO Box 2100 Adelaide SA 5001 Australia
3. Watermark Numerical Computing; Brisbane Australia
4. QGC - A BG Group Business; Groundwater project; Level 18, 69 Ann Street Brisbane QLD 4000 Australia