Modelling riparian buffers for water quality enhancement in the Karapiro catchment
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The use of riparian land buffers is widely promoted as a method of mitigating the
effects of sediment and nutrient runoff from intensive land use in New Zealand.
Farmers receive advice and financial assistance from Regional Councils for activities
such as establishment and planting of riparian buffers, but funding is limited.
The effect of buffers on water quality goals varies across land types so the optimum
size of riparian buffer width varies across farms. We build a stylised model to
determine the optimum buffer width and apply it to the Karapiro catchment. The
model can easily be extended to model salinity removal, conservation reserve
programmes, establishing wetlands and carbon sequestration.