In the attached article please find the description of Glen Canyon dam near failure. Here are the details. Glen Canyon dam was constructed using 4 bag concrete, against the engineering recommendation of 5 bag. As the flood described in the document was happening, the flow rate was actually filling the spillway passages. The design never accounted for a situation like that. The bottom of the spillways (inside the dam) were curved where they bent at the bottom where they turned to exit the bottom of the dam about 40 feet above the base river level. As the vertical (unlined) filled ever higher as the flow increased, the portion of the passage at the corner began to cavitate. the engineers felt the structure begin to shake. They were so concerned that they applied the Band-aid fixes discussed. The text is accurate. I was privileged to be in a conference with the engineers (after the event was over) at Northern Arizona University. A real close call. Jim
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Today's Featured Article - Tractor Profile: Oliver 70 Row Crop - by Staff. The Oliver 70 was part of the "Fleetline Series" and was manufacturered from 1937 to 1948. The row-crop configuration could have either dual or single front wheels. The Oliver 70 was also offered in the standard, orchard and industrial configurations. The tractors were sold in Canada. An early advertisement states "Power when you want it - power when you need it - power to help put in crops when field conditions are right and time and help are limited. That's the power you'll find in an Oliv
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