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New Big Dig plan drops cost to $248 million — but 19% reduction doesn’t satisfy critics 

Reeling from the initial estimate, council members had asked Williamson in November to come back with a range of lower-cost scenarios that all would remove flood waters less quickly. There were 113 model runs, 18 pump and discharge combinations and 43 scenario runs. But after extended number-crunching, engineers settled on a single option.