2014 Aswan tribal clashes 2014 Aswan tribal clashes The Aswan tribal clashes were a series of clashes east of Egypt's southern city of Aswan between two local ethnic tribes: the Arab Al-Halayel (Beni Helal) clan and the Nubian Al-Dabodeya family. Shootings and stabbing occurred throughout the city following verbal insults between students from both sides at a local school on Wednesday, two days before the violence. Cars were torched and homes were looted and burned down. The army had intervened to contain the crisis following a call by Aswan's governor. Vendetta killings are very common in Upper Egypt and can last across generations, but
Hydropower policy in the United States of 90% efficiency. More importantly, Francis's mathematical and graphical calculation methods advanced turbine design and engineering and allowed confident design of high efficiency turbines to exactly match a site's flow conditions. In the 1870s and deriving from uses in the mining industry, the high efficiency Pelton wheel impulse turbine was developed to use hydropower under very different flow and pressure conditions. Advances in dam design also progressed, with the completion of Old Aswan Dam being considered a milestone of engineering over nature. At the time of its construction, nothing of such scale had ever been attempted: it also became one