SEEPAGE IN FILYOS LEVEES WHOSE UPSTREAM FACE IS COVERED

Characterization and axiomatization of all semigroups whose square is group

In this paper we give a characterization for all semigroups whose square is a group. Moreover, we axiomatize such semigroups and study some relations between the class of these semigroups and Grouplikes,introduced by the author. Also, we observe that this paper characterizes and axiomatizes a class of Homogroups (semigroups containing an ideal subgroup).  Finally, several equivalent conditions ...

Use of Numerical Simulation to Measure the Effect of Relief Wells for Decreasing Uplift in a Homogeneous Earth Dam

Relief wells are used extensively to relieve excess hydrostatic pressure in pervious foundation strata overlain by impervious top strata, conditions which often exist landward of levees and downstream of dams and hydraulic structures. Placing well outlets in below-surface trenches or collector pipes helps dry up seepage areas downstream of levees and dams. Relief wells are often used in combina...

Whose difficulty is it?

Whose future is it?

Good morning. It is a great honour to deliver this talk to a research community of which I have been a member when we were not sure that it was a domain of its own. It has since then developed in an impressive manner, and today it offers all the signs of a maturing scientific community in a technical field: a yearly conference with growing attendance, some structuring paradigms, progress in mod...

Bandsar agriculture: indigenous runoff-harvesting &climate change resilience in Iranian dry lands

Iranians have a very long history of water harvesting to address water scarcity and the consequences of frequent droughts. Among these strategies, Bandsar is a wide spread indigenous practice, which has been utilized in the central and the southern part of Khorasan province (the northeast Iran). Bandsar in Persian means a series of consecutive bands, berms, levees, or dikes. A Bandsar consists ...