This paper presents the design and construction of a deep rock conveyance and storage tunnel and pump station cavern that was built about 70 m below ground surface for the City of Indianapolis. The TBM tunnel ran nearly 13 km in limestone with a finished inside diameter of 5.5 m. It provided a minimum storage volume of 300 million liters of untreated excess wet weather overflow. A pump station was planned for dewa-tering of the tunnel and discharging the CSO flow to a surface advanced wastewater treatment facility with a firm capacity of 340 million liters per day. The pumps were located within an 18.3 m wide and 24.4 m high deep mined rock cavern. The project also had several deep shafts including the TBM launch/screen & grit and retrieval shafts, the pump room cavern access/discharge and equipment shafts with inside diameters ranging from 4.9 to 13.4 m.
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