Main Drain

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Main Drain flows into Kaiapoi River , which it joins at S 43° 22′ 25″, E 172° 38′ 4″ at OSM node n30328385, and there 96 km of total upstream flows in. load it's distributaries

Main Drain has 2 tributaries.

• Cust River, which joins it at S 43° 19′ 42″, E 172° 32′ 17″ at OSM node n31154657, and 67 km of total upstream flows in.
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• (unnamed), which joins it at S 43° 21′ 40″, E 172° 36′ 26″ at OSM node n6175008030, and 219 m of total upstream flows in.
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