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Markets
Water
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Location
Las Vegas, Nevada, USA
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Client
Clark County Water Reclamation District
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Completion date
2018
Lisa Wheatly
VP, Director of Intermodal Business Development and Strategy, Denver, Colorado, United States of America contact form+1 720 475 7024
The Clark County Water Reclamation District’s (CCWRD) facility is the largest wastewater agency in the State of Nevada and serves the Las Vegas Valley, including the “Las Vegas Strip,” with a capacity of 150 million gallons per day. Prior to our work on this project, the existing channel through the property regularly flooded and put the operation of the facility at risk.
During large storm events, the Las Vegas Wash channel overbanks would flood due to overflow of the main channel, requiring regular and costly debris cleanup and repair of the facility’s only access road. Despite it not being designed to do so, the access road served as a grade control structure to protect improvements made to the channel upstream. Aside from making the facility inaccessible, failure of the road would have jeopardized the structural stability of those improvements as well as threatened underground utilities. Failure of the access road would have also resulted in damages to the surrounding private and public properties and facilities.
To remedy, we developed pre- and post-project hydraulic models of the area using 1D and 2D hydraulic models and performed sediment transport analysis. A secondary access road was constructed and additional security measures were put in place to secure the site. We designed 1,100 feet of new utilities (20-inch water, twelve 6-inch power conduits, twelve 4-inch fiber-optic conduits, and four 12-inch sludge lines) crossing the wash.
To reduce cost and expedite construction of a new 200-foot steel girder bridge over Las Vegas Wash, we used recycled steel girders from a former bridge. We inspected the structure, investigated the life span of the steel, verified the geometry of the girders for compatibility of design, and modeled using MDX software.
These efforts greatly improved the safety and movement of floodwaters, improved access to the facility, mitigated channel degradation, protected existing utilities from flooding and erosion, reduced maintenance, and reclaimed about 40 acres of land within the CCWRD’s property.
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