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The Lake Rotorua catchment boundary is defined by the surface catchment, in part, and by the groundwater catchment outside the surface catchment.<\/SPAN><\/P>

The surface catchment was defined at a 1:2000 scale using LIDAR digital terrain measurements.<\/SPAN>Then, the groundwater catchment <\/SPAN>was<\/SPAN>defined. This catchment generally coincides with the surface catchment. However, the catchment is outside the surface catchment over the Mamaku Plateau and the boundary is identified by data including: water budgets, digital terrain measurements, groundwater level measurements and estimates of specific discharge in streams.<\/SPAN><\/P>

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