The City of San Antonio, Texas is completing one of its largest flood control construction projects to date, a multimillion dollar effort to improve storm water drainage into Woodlawn Lake by replacing the existing channel with a new channel of greater capacity in order to remove numerous private properties and public infrastructure from the 100 year flood plain, which experienced catastrophic flooding in 2002.
The construction of Phase 2 of the Seeling Channel Improvements project includes completing the channel work from near Wilson Boulevard to Morning Glory Drive and features the demolition and replacement of 2,470 lineal feet of existing concrete channel and 2 concrete vehicular bridges which cross the channel at Huisache Avenue and Morning Glory Drive. The excavation for the new cast in place concrete channel structure averages 60 feet wide by 15 feet deep and is supported by an engineered steel beam and wood lagging shoring system in order to accommodate the limited work area access between the channel and adjacent private properties.
In advance of the new concrete channel and bridge improvements, existing underground potable water and sewer lines were kept in service while the installation of new replacement underground utilities took place. New underground utilities include 3,500 lineal feet of 8 inch to 16 inch water line, 2,500 lineal feet of 30 inch sewer line and 350 lineal feet of 24 inch to 60 inch storm drain line.
Stiver Engineering provided the contractor with construction engineering through the design of the steel beam and wood lagging shoring system that the channel walls were poured against.