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The Selwyn Waihora water management zone includes the headwaters of the Waimakariri River to the Gorge, and part of the headwaters of the Rakaia River, including the Wilberforce, Harper and Avoca Rivers and Lake Coleridge. The Zone includes the central plains, between these two rivers, the catchment...

Te Waihora / Lake Ellesmere is a large coastal lake located in the Selwyn District. The lake is intermittently open to the coast near Taumutu.

Te Waihora/Lake Ellesmere is a large shallow coastal lake located in the Selwyn District. This site is monitored for recreational water quality during the summer months only.

Te Waihora/Lake Ellesmere is monitored for water quality near Taumutu, located near the opening of the lake.

Te Waihora/Lake Ellesmere is monitored for water quality at the Kaituna Lagoon, just off SH75.

The lower tributaries of Te Waihora/Lake Ellesmere are spring-fed streams that emerge on the Canterbury Plains and flow into the lake. These streams, along with extensive land drainage systems around the lake margins, strongly influence the water quality and ecological health of Te Waihora/Lake Elle...

Te Waihora/Lake Ellesmere is monitored for water quality in the centre of the lake.

Te Waihora/Lake Ellesmere is monitored for water quality off the Selwyn River mouth, near the lower Selwyn Huts.

Te Waihora/Lake Ellesmere is monitored for water quality south of timberyard point, near the lakeside domain.

Waikekewai is a small spring-fed waterway and is the southern most tributary of Lake Ellesmere/Te Waihora. Water quality and macroinvertebrates are collected from Waikekewai Stream upstream of Gullivers Road.