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City details emergency downtown sewer repairs after flooding; crews used dewatering and a "burrito" bedding to stabilize pipe
Summary
Public works staff described emergency repairs to downtown sewer mains damaged during recent flooding, including two sinkholes, dewatering wells, removal of about 40 cubic yards of sediment from the grit system, and a rock-and-fabric bedding technique staff called a "burrito." Staff said further in-pipe repairs will be proposed after complete TV inspection.
City public works staff gave a technical briefing Jan. 21 on emergency downtown sewer repairs performed after recent flooding that produced sinkholes and heavy sediment in the system.
Director Hamlin told the Parks and Public Works Committee that crews discovered a sinkhole in a resident's yard and a larger sinkhole in Cedar Alley after the flood night (identified in the briefing as the 10th). The downtown sewer in that area consists of concrete bell-and-spigot pipe installed in the early 1960s and bedded in loose, sandy, lake-bed soils. Hamlin said the high groundwater and hydraulic pressure during the flood allowed water to carry sediment into the line, flushing material downstream and leaving voids that caused pipe segments to fail or sink out of sight.
The city located a contractor (named in the briefing as Fury) that was working nearby and put crews to work…
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