Wet n Dry (Canterbury) Traditional Cache
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(regular)
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No playing on the road, there is safe parking; just turn east just north of the bridge.
Sometimes the river is dry and sometimes wet. Every time we pass over we look to see if there is water running, even in high summer.
The Selwyn River drains the Canterbury foothills and flows – sometimes – for 60 km across the Canterbury Plains to Te Waihora (Lake Ellesmere). A striking feature of the Selwyn is the absence of water in its middle reaches for most of the year. Water begins leaking from the river into the underlying aquifer as soon as the Selwyn flows onto the plains, and disappears within 10 km. The next 35 km of river has surface flow only in mid-winter, and during brief spring and autumn floods. About 15 km upriver from Te Waihora, shallow groundwater rises to the surface, and the Selwyn flows year-round from this point to the lake.
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