Page 20 - jdrogers2017ab
P. 20
• Hydrostatic, or uplift forces, act equally in all directions and serve
to reduce the effective weight of the dam, and may cause it to
become unstable.
• If the dam tilted forward ½ degree, this would explain the 3.67
inch drop of the reservoir, recorded 40 minutes before the failure.
• When the dam separated at its upstream toe, the resultant thrust
would have been shifted 240 feet downstream, indicative of
overturning instability.
