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>>

  • 1 injured, suspect in custody in Florida school shooting

    1 injured, suspect in custody in Florida school shooting

    Friday, April 20 2018 11:11 AM EDT2018-04-20 15:11:47 GMT

    OCALA, Fla. - Authorities say one student shot another in the ankle at a Florida high school and a suspect is in custody. This is a developing story. Check back for updates. 

    More >>

    OCALA, Fla. - Authorities say one student shot another in the ankle at a Florida high school and a suspect is in custody. This is a developing story. Check back for updates. 

    More >>
  • Ferris High School's Mandy Manning named 2018 National Teacher of the Year!

    Ferris High School's Mandy Manning named 2018 National Teacher of the Year!

    Friday, April 20 2018 10:45 AM EDT2018-04-20 14:45:57 GMT

    SPOKANE, Wash. - Congratulations to Ferris High School's Mandy Manning, who was announced as the National Teacher of the Year early Friday morning!  CBS tweeted the announcement just after 5:40 a.m. Manning teaches English and Math to refugee and immigrant students at Ferris and beat out two other finalists from Ohio and New Jersey.  Congratulations, Mandy! 

    More >>

    SPOKANE, Wash. - Congratulations to Ferris High School's Mandy Manning, who was announced as the National Teacher of the Year early Friday morning!  CBS tweeted the announcement just after 5:40 a.m. Manning teaches English and Math to refugee and immigrant students at Ferris and beat out two other finalists from Ohio and New Jersey.  Congratulations, Mandy! 

    More >>
  • Massachusetts family bans term 'best friend'

    Massachusetts family bans term 'best friend'

    Friday, April 20 2018 10:42 AM EDT2018-04-20 14:42:02 GMT

    GEORGETOWN, Mass. - A Massachusetts family is looking for a new preschool for their 4-year-old daughter because her current school has barred use of the term "best friend."  Christine Hartwell says her daughter, Julia, appeared sad recently when she came home from the Pentucket Workshop Preschool in Georgetown.  

    More >>

    GEORGETOWN, Mass. - A Massachusetts family is looking for a new preschool for their 4-year-old daughter because her current school has barred use of the term "best friend."  Christine Hartwell says her daughter, Julia, appeared sad recently when she came home from the Pentucket Workshop Preschool in Georgetown.  

    More >>