ABSTRACT
The main contributions of Engez are in hydraulic structures, an important aspect for the hydropower production of his country. Currently, Turkey is the European country with the largest number of dam projects both under design and execution. The large schemes are erected on the two main Turkish Rivers, the Euphrates and the Tigris Rivers. During his PhD thesis, Engez investigated the effect of silt on the resistance characteristics of pipe flow. This aspect was found to be relatively small in the usual sediment concentrations encountered in practice, but it may become large for high concentration flows. Later, around 1960, Engez investigated a ski jump energy dissipator. This hydraulic element was successfully implanted in a large number of spillways provided large specific discharges are considered and the take-off velocity is at least of the order of 15 m/s. Further, this procedure requires large space which is not always available in narrow gorges or in places with a developed infrastructure. His 1961 paper reviews discharge coefficients of weir structures for a number of crest geometries. The discharge coefficient is directly related to the discharge and therefore is an index of the hydraulic capacity of a weir. Other important aspects to be considered is the cavitation risk, safety against weir overtopping and economy.
