WEBVTT

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The US Army Corps of Engineers Tulsa

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District is tackling a dam safety

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repair at Oligo Dam in Rogers County ,

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Oklahoma . So we're installing a new

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stelling basin and repairing an old

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stelling basin . What the stelling

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basin is , is it is a platform that is

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designed to reduce erosion as well as

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slow down the rapids directly out of

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the gate . During a 2022 inspection ,

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engineers identified damage to concrete .

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We actually had an advanced study done .

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In the Stilling basin , they found that

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it was actually the fine particles ,

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sediment particles that would get

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trapped within the Stilling basin , um ,

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that would cause ball milling in

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between the baffle blocks that over

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time just releases below 3000 CFS were

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causing greater damage . Each 19 ft

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conduit can release up to 17,500 cubic

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feet , about 131,000 gallons ,

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every second . Even at half capacity ,

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the water from a single conduit hits

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the basin floor with over 3.8 million

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pounds of force . That's more than

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twice the thrust a Falcon 9 rocket

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produces during liftoff . So whenever

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we're really seeing a max discharge out

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of the conduits , we're looking at

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approximately 35,000 CFS . At that rate ,

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we'll see anywhere from in the millions

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pound force . Before any concrete work

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begins , contractors use heavy

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equipment to construct a cofferdam in

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the Verdigris River downstream of the

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work area and are currently pumping the

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basin dry . Engineers expect the

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project to wrap up in about 10 months .