ABSTRACT
The Outfall conveys highway and other urban drainage to the South Platte River as well as provides long needed relief from flooding problems in the southeastern portion of the Interstate 25 highway corridor. The Outfall tunnel conveys storm water under I-25 then under Mississippi Avenue to the river. The Outfall consists of a number of distinct elements with water flowing and connecting from east to west as follows: an Energy Dissipation Structure, 91 m of 213 cm diameter jacked pipe EPB crossing under I-25, Junction Interceptor Structure, 554 m of 4 m ID tunnel excavated by EPB machine technology, a Transition Structure (connecting the circular section to a rectangular section and serving as the main tunnel driving shaft), 266 m of 5.5 m wide by 2.4 m high cut and cover box structure, and Outfall Structure at the South Platte River.
