Mark segraves takes us inside the big dig. Reporter the milestone for the d. C. Clean rivers project that will be complete in 2022 has the enormous borehead from the underground drill was removed from the tunnel. About four and a half miles. Its taken several years to do. Were on time, were underbudget. Reporter that budget is more than 2 billion. Theres an item on everybodys bill. Next year its going to be 20. Its going to continue to go up. Reporter while water bills will continue to go up each year, our rivers and creeks will continue to get cleaner. The new tunnels will supplement the existing tunnels which were built in the 1800s and cant handle all of the rain and sewage which leads to massive flooding in d. C. Neighborhoods. For a long time that maintenance was deferred. The bill has come due now. Reporter flooding isnt the only thing these new tunnels will fix. The existing sewers become overwhelmed each time we have a big rain, forcing billions of gallons of sewage and rain to
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