SECTION 2 Environmental Setting C:\D Data\GWS C Drive\GWS\Client Files\1344 OGL - WKP\4 Deliverables\WKP Final Draft Report\June Report\WAI-985-000-REP-LC-0030. Final_Rev_0.docx 10 slopes. The potentiometric surface is generally expected to mimic that of the surrounding topography. There is a high level of topographic relief within the Wharekirauponga catchment ranging from 750 m RL at the head, reducing to 30 m RL at the catchment discharge point (WKP1 surface water monitoring site). This degree of relief provides a significant driving head for the catchment as a whole. The upper third of the catchment is steep, with the gradient flattening to the north east with the change in gradient correlating, generally, with the heads of streams (i.e. the inflection point is where surface waters become gaining). Figure 8A provides a plan of the Wharekirauponga catchment showing an inferred potentiometric surface and drainage pattern. Figure 8B shows sections through the catchment. Figure 8A Wharekirauponga Groundwater Catchment Outline
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