A map of a heavy textured grassland dairy farm (Farm #1 from Table 2) showing the risk classes of the open drainage channel network.

A map of a heavy textured grassland dairy farm (Farm #1 from Table 2) showing the risk classes of the open drainage channel network.

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Introduction On intensive grassland dairy farms in high rainfall areas with poorly drained soils, networks of open drainage channels linked to in-field drainage systems are needed to enable farm operations. Nitrogen and phosphorus point and diffuse sources may be connected to this open drainage channel network along surface and subsurface pathways,...