Owner: City of Austin
Contact: Ramesh Swaminathan
Title: Project Manager
Address: Waller Creek Center, 625 E. 10th St, Austin, Texas 78701
Phone number: (512) 972-0244

Project Description:
Following construction of the 96 inch effluent line from the Walnut Creek Wastewater Treatment Plant to the Colorado River (~1997) the Austin Water Utility constructed two bank stabilization projects on Walnut Creek to prevent stream migration into the line that runs parallel to the creek corridor. Additionally, two unprotected sites upstream of the past projects have created some concern for future erosion into the line. The Austin Water Utility now plans to design protective measures for the two unprotected sites.

Services Provided:
CAS is providing HEC-RAS modeling and stream bank stabilization design as the prime consultant. CAS will prepare engineering plans, specifications, and bid documents to stabilize the stream bank slopes at the two unprotected sites. The existing top of the bank on the eastern side of the creek will be preserved and new embankment material, rock armoring, and grade control structures will be used to move the creek channel to the west. Submittals will include PER, 30%, 60%, 90%, Final, and Issue for Bid packages. The following tasks will be performed by CAS for this project:

• Project Meetings and Coordination
• Preliminary and Final Engineering Reports
• HEC-RAS models of existing and proposed conditions
• Construction Plans, SW3P, Standards, Specifications, and Bid Documents
• Scour, riprap sizing, and other stream bank stabilization calculations