Alpine Storm Drain

Project Overview

After the fires in the Alpine Loop in 2012, VanCon was hired to work on flood mitigation. VanCon deepened a detention basin, lined it with riprap, fabric, and grout, and added a box to reduce the force of the floodwater. When an abnormally strong storm washed out the lining during construction, Alpine City, the Division of Natural Resources, Bowen Collins & Associates, and VanCon collaborated on more robust stormwater mitigation: installing an apron around the box exit, digging and lining a new channel below the detention basin with riprap, adding minor ponds to manage large influxes of floodwater, and upgrading the city storm drain. The storm drain upgrade included a new 108-inch storm drain, 111 feet of 18-inch RCP, 1,821 feet of 36-inch RCP, 825 feet of 48-inch RCP, and 400 feet of 60-inch RCP in Alpine Blvd and public and residential right-of-ways, boxes and manholes, curb inlet boxes, 18-inch RCP laterals, and concrete curb and gutter repair.

Project Highlights

• Post-wildfire flood mitigation following 2012 Alpine Loop fires
• Detention basin deepened, lined with riprap, fabric, and grout
• New channel dug and lined below detention basin
• Apron installed at box exit to reduce floodwater force
• Minor ponds added for large influx management
• New 108-inch storm drain installation
• 1,821 feet of 36-inch RCP, 825 feet of 48-inch RCP, 400 feet of 60-inch RCP
• Curb inlet boxes, 18-inch RCP laterals, curb and gutter repair