1. Physical Geography Group; Institute of Agriculture & Environment; Massey University; Palmerston North 4442 New Zealand
2. Department of Geography & Earth Sciences; River Basin Dynamics and Hydrology Research Group; Centre for Catchment and Coastal Research; Aberystwyth University; Aberystwyth SY23 3DB UK
3. School of People, Environment and Planning; Massey University; Palmerston North 4442 New Zealand