There can be significant internal erosion
of the soil under scenarios that are considered safe according to the classical continuum calculations used in engineering practice; this phenomenon is called internal instability.
However, internal erosion
is known to occur in these seepage barriers and the ability of predicting this kind of piping has been inadequate and leads to many failures [3, 4].
The bombing was in spite of a September 2006 report by the US Army Corps of Engineers warning: "In terms of internal erosion
potential of the foundation, Mosul Dam is the most dangerous dam in the world." On 30th October 2007 another report by the US Special Inspector General for Iraq Reconstruction (SIGIR) said that the Dam's foundations could give way at any moment.
Overtopping and accidental leaking, mainly due to internal erosion
, are different technological problems, but the frequently available technology for solving them is the same, so the conference considered them together.
The study by Ann Lesch, entitled Concentrated Power Breeds Corruption, Repression and Resistance, deals with the issue of internal erosion
of Mubarak's regime.
This will prevent condensate from accumulating in the pocket and then passing through the control valve increasing the likelihood of internal erosion
and premature failure.
Department of Energy grant of $210,920 to fund the study of internal erosion
, particle transport and channelization driven by fluid flow.
The apparent defection buoyed opposition supporters' hopes of a political solution to the crisis, as they contend that high profile political defections are key to an internal erosion
of the Syrian state.
Flow through soil pipes results in internal erosion
of the pipes, which may produce gullies by tunnel collapse.
Among the topics are risk analysis of individual landslides in the Three Gorges Reservoir, the simultaneous modeling of internal erosion
and deformation of soil structures, geotechnical properties of zinc and lead mine tailings from Tara Mines in Ireland, pH changes in solidified dredged materials, the rapid drawdown of the water table in layered soil column, and a mathematical model for determining the critical hydraulic gradient in soil piping.
Hard trim materials and a design that diffuses the discharge from the plug and seat and reduces internal flow velocities to minimise internal erosion
further extends valve life.
Army Corps of Engineers decided recently to postpone study of the dam's vulnerability to earthquakes, so that the more immediate threat - a possible break in the dam due to internal erosion
- can be fixed by the end of the year, project manager Mark Dasso said.