Lesson plan
Rees River
The Rees River (Māori language: Puahiri or Puahere) is a headwater tributary of the Clutha River / Mata-Au that drains eastward of the main divide of the Southern Alps / Kā Tiritiri o te Moana in New Zealand. The river runs 41 km, drains an area of 406 km 2 , and discharges into the head of Lake Wakatipu at Glenorchy. Bound by the Richardson (Whakaari) Mountains to the east and the Forbes Mountains to the west, its snow-covered headwaters rise above 2000 m. The upper parts of the Rees River occupy a formerly glaciated valley that was fed by the Tyndall Glacier, which now drains into the adjacent Dart Valley. Below Rees Saddle the river valley is constrained by a series of steep alluvial fans that are fed from tributary basins. The lithology of the Rees catchment is highly erodible schist of the Aspiring lithologic association. The underlying schist is highly fissive due to its fine-grain, segregated quart-feldspar-mica composition. The Rees valley, covered in tussock and native forest, is a popular location for recreational fly fishing, pack rafting and tramping, including the Rees and Dart Tracks, a five-day loop which crosses from the upper reaches of the Rees into the valley of the Dart River / Te Awa Whakatipu. However, the steep hillsides, easily erodible rock, proximity to the Alpine Fault, and intense rainfalls contribute to geohazard risks in the region.…
Article summary
The Rees River (Māori language: Puahiri or Puahere) is a headwater tributary of the Clutha River / Mata-Au that drains eastward of the main divide of the Southern Alps / Kā Tiritiri o te Moana in New Zealand. The river runs 41 km, drains an area of 406 km 2 , and discharges into the head of Lake Wakatipu at Glenorchy. Bound by the Richardson (Whakaari) Mountains to the east and the Forbes Mountains to the west, its snow-covered headwaters rise above 2000 m. The upper parts of the Rees River occupy a formerly glaciated valley that was fed by the Tyndall Glacier, which now drains into the adjacent Dart Valley. Below Rees Saddle the river valley is constrained by a series of steep alluvial fans that are fed from tributary basins. The lithology of the Rees catchment is highly erodible schist of the Aspiring lithologic association. The underlying schist is highly fissive due to its fine-grain, segregated quart-feldspar-mica composition. The Rees valley, covered in tussock and native forest, is a popular location for recreational fly fishing, pack rafting and tramping, including the Rees and Dart Tracks, a five-day loop which crosses from the upper reaches of the Rees into the valley of the Dart River / Te Awa Whakatipu. However, the steep hillsides, easily erodible rock, proximity to the Alpine Fault, and intense rainfalls contribute to geohazard risks in the region.…
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Discussion questions
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