![]() Staging, planning and work began in early August 2009 with a scheduled completion date of mid-October to avoid winter weather. Mays Construction Specialties based in Grand Junction, CO, was selected as the contractor. materials were chosen for the expansion joint treatment. Subsequently, Buckhorn Geotech designed a scope of work to rehabilitate concrete blowouts, scour floors and damaged joints within the concrete flume and then apply a waterproofing and protective coating to the sides and floor. "We selected the crystalline waterproofing system for the repair and protection of the concrete flume because it could be installed in confined spaces as well as the system's ability to seal or heal itself should damage occur to the concrete surface from falling rock or routine maintenance in the coming years," Aufderheide said. ![]() Blended into fresh concrete or spray-coated on existing concrete, the product can seal the paths by which water and aggressive chemicals penetrate, attack, and ultimately threaten the long-term integrity of a concrete structure. The firm had successfully used the system on smaller concrete projects with similar deterioration problems. The project team inspected the flume to determine the scope of work required.īuckhorn Geotech selected the Xypex spray-on crystalline waterproofing system for the project. "We opted for a concrete sealer solution instead." "In the event of a membrane leak, the ability to locate any penetration and create a clean moisture-free repair was a real concern to the district," Aufderheide said. Per the district's request, Buckhorn Geotech initiated a three-year program to test various membrane liners, only to find that conventional liner solutions were not ideal in this environment. Added to this, access to the flume is limited to a few weeks in August and September when the canal is not operational and ahead of the winter temperatures and snow." "At 7,000 feet, weather conditions are harsh with an average winter temperature well below freezing. "This is a challenging environment for people and structures," said Norm Aufderheide, an engineer with Buckhorn Geotech. Unfortunately, conventional methods of rehabilitation, such as liners, did not provide the long-term, easily repairable solution sought by the district. The Inlet Canal includes a one-mile U-shaped concrete flume that was showing signs of serious deterioration ranging from surface spalling of the floor and joint deterioration to wall blowouts and vertical wall cracks. The off stream reservoir is fed by the 2.6 mile concrete Inlet Canal that extends from the Mancos River. ![]() A condition assessment and recommendation report prepared by Buckhorn Geotech for the district concluded that the 60-year-old concrete structure had retained most of its structural integrity and functionality - with a few exceptions. When the Jackson Gulch Reservoir infrastructure began to show signs of wear and tear, its owner, the Mancos Water Conservancy District, was justifiably concerned. It supplies much-needed water to 13,746 acres of agricultural lands and domestic water to Mesa Verde National Park, Mancos Rural Water Company and the town of Mancos. First constructed in 1950, the Jackson Gulch Reservoir is a vital resource to resident and visitors of the high mountain regions of Southwestern Colorado.
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