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为保证葛洲坝水利枢纽大江按期截流,必须在1980年汛后10～11月份将二江上游围堰外,经1979～1980年两个汛期的回流淤积100余
In order to ensure the closure of the major rivers of Gezhouba Hydropower Station on schedule, it is necessary to reclaim more than 100 sediments from the upstream cofferdams of the two rivers during the flood season in the two flood season periods from 1979 to 1980 from October to November in 1980.