Crack In Wanapum Dam Blamed On Math Error - NBC Right Now/KNDO/KNDU Tri-Cities, Yakima, WA |

Crack In Wanapum Dam Blamed On Math Error

Posted: Updated:
The fracture forming on spillway monolith No. 4 may have been exacerbated by a weak construction joint. The fracture forming on spillway monolith No. 4 may have been exacerbated by a weak construction joint.
A team of engineers discovered the mathematical error while examining the original design calculations of the Wanapum Dam spillway. A team of engineers discovered the mathematical error while examining the original design calculations of the Wanapum Dam spillway.
BEVERLY, Wash. - After an 11-week investigation by the Grant County PUD, officials have determined that a math error in pre-construction was the main reason a crack developed in the Wanapum Dam. 

The results of the investigation still have to be reviewed by the Grant County PUD's Board of Consultant, but so far it appears a crack formed on a spillway may have been made worse by a weak construction joint. 

Engineers recalculated the original designs of the dam and found that additional concrete and/or reinforced steel should have been included when the dam was built 50 years ago. Officials say the original designers of the dam miscalculated that the spillway's concrete provided enough strength to resist the force of the water pushing against it. 

Repairs will be made to the dam throughout the summer, meaning water levels will be low for most of the season. 

Grant County PUD provided a diagram of how the crack formed over time. You can view the diagram by clicking the photo attached to this story. 
HD DOPPLER 6i
/
  • Top Stories from KHQHomeMore>>

  • Hot Clicks: Chinese factory raided for producing fake Budweiser cans of beer

    Tuesday, May 30 2017 9:10 AM EDT2017-05-30 13:10:30 GMT

    KHQ.COM - A factory in China was raided after authorities discovered they were producing 600,000 flats of fake Budweiser beer cans every month and distributing them to bars and nightclubs in the country. Video of the illegal production was released by an anonymous user on the social platform, WeChat.

    More >>

    KHQ.COM - A factory in China was raided after authorities discovered they were producing 600,000 flats of fake Budweiser beer cans every month and distributing them to bars and nightclubs in the country. Video of the illegal production was released by an anonymous user on the social platform, WeChat.

    More >>
  • Backhoe stolen in broad daylight from Spokane Valley veteran

    Backhoe stolen in broad daylight from Spokane Valley veteran

    Tuesday, May 30 2017 2:49 AM EDT2017-05-30 06:49:36 GMT

    SPOKANE VALLEY, Wash. - A Vietnam veteran is hoping to get his backhoe back after it was stolen on Sunday in broad daylight. Sunday afternoon Geno Werner went to lunch with a friend on Memorial Day weekend. When the Navy veteran got home, he was shocked to see his camouflage backhoe that was parked on the street right next to his Spokane Valley home was missing.

    More >>

    SPOKANE VALLEY, Wash. - A Vietnam veteran is hoping to get his backhoe back after it was stolen on Sunday in broad daylight. Sunday afternoon Geno Werner went to lunch with a friend on Memorial Day weekend. When the Navy veteran got home, he was shocked to see his camouflage backhoe that was parked on the street right next to his Spokane Valley home was missing.

    More >>
  • Mad Minute stories from Monday, May 29th

    Mad Minute stories from Monday, May 29th

    Tuesday, May 30 2017 2:00 AM EDT2017-05-30 06:00:10 GMT

    Here are the extended versions of the KHQ Local News 11 at 11 Mad Minute stories from Monday, May 29th.

    More >>

    Here are the extended versions of the KHQ Local News 11 at 11 Mad Minute stories from Monday, May 29th.

    More >>