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The Motueka-Riwaka Plains is situated northwest of Nelson.  Gravels deposited into Tasman Bay from the Motueka and Riwaka rivers have formed the Motueka-Riwaka coastal plains. Covering an area of approximately 40 km2, these plains support intensive horticulture and the towns of Motueka and Riwaka....

The Motueka River starts in alpine headwaters and flows 110 kilometres from source to the sea. It delivers more than 60% of the freshwater inflow to Tasman Bay. The river is braided in the approximately 10 kilometre segment between Kohatu and the Wangapeka River and is used by river-nesting birds su...

This site is about 12km upstream of SH60 at Motueka and about 5km downstream of Ngatimoti.

The Upper Motueka Management Area comprises a very large catchment with varied geology. Precipitation rates vary from 4000mm annually in the western catchments to 1000mm in the east. Land use in the valley floors is mainly cropping and pasture with limited horticulture.

The Motueka Valley Aquifer is an unconfined gravel alluvial aquifer which underlies the river terraces of the Motueka River and its tributaries. The aquifer is shallow with a gravel depth of up to 10 m and is underlain by claybound gravels in the upper catchments and by granite geology below the Wan...

The Motueka/Riwaka Plains Management area covers the alluvial floodplains of the Motueka and Riwaka Rivers.The dominant land use in this area is mainly horticulture.

This site is monitored by NIWA and is one of the original National River Water Quality Network (NRWQN) sites dating back to 1989.  This is one of three reference sites in the Motueka catchment, along with Wangapeka at 5km up stream of Dart and Hunters at Kikiwa.

The Motupiko River is a major tributary of the Motueka River. Sampling programme change: Beginning July 2016, Tasman District Council increased the frequency of sampling from quarterly to monthly and shifted from dry weather sampling (waiting at least three days after rain) to all-weather sampling....