Assertion: weir | /r/CapableOf | perform two roles
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Source sentences:
text: The weir would perform two roles: first, it would maintain a pool of water up-river, sufficiently deep enough to allow continued use of the pumping station at Mannum during prolonged drought conditions; and second, the weir would reduce the flow of fresh water into Lake Alexandrina and Lake Albert which evaporates over 1,000 gigalitres (3.5×1010 cu ft) of water a year.