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The city of Des Moines will open bids Tuesday for a $5 million project to reline 33,000 feet of sanitary and storm sewers in 2009.

The relining process would use flexible liners made of resin-impregnated felt. No digging is necessary; crews use water to force each segment of liner into an existing sewer line and shape it into a tube. Then the water is heated, catalyzing the resin and making the liner solid.

Sewers under a number of downtown blocks are among those to be updated, including Grand Avenue from the Des Moines River to Third Street, Watson Powell Jr. Way from Third Street to Seventh Street and East Court Avenue from Robert D. Ray Drive to East Seventh Street. Some of the city’s sewers date back to the 1870s and are made of clay, bricks or concrete.