Long crested weirs are gaining popularity amongst the hydraulic engineers owing to obvious hydraulic advantage of flow magnification. These weirs can pass much higher floods from the available width of a natural water course. Such weirs may also be introduced in water treatment plants for mixing of chemicals. This paper discusses the advantages of long crested weirs, such as duckbill and labyri...

Basic experiments were conducted on a large-size broad-crested weir with an upstream rounded corner. Detailed velocity and pressure measurements were performed for a range of flow conditions. The results showed the rapid flow re-distribution at the upstream end of the weir, as well as next to the weir brink at large flow rates. Assuming non-uniform velocity and nonhydrostatic pressure distribut...

circular- crested weirs are employed for flow measurement among their other wide applications in hydraulic engineering. they can also be used to control water level in farm ponds and reservoirs. advantages of the circular crested weirs as compared to other weirs include the stable overflow pattern, the simplicity of design and their associated lower costs. in this study, the curvilinear flow pa...

side weir is a flow control structure that used extensively in irrigation and drainage as well as sewer networks. throughout the present research, a study comprised of 162 experiments was done on sharp-crested semi-circular side weir. since the height in this side weir varies along its length, this feature enables it to more properly control flood than rectangular side weirs in various flood co...

Basic experiments were conducted on a large-size broad-crested weir with a rounded corner. Detailed free-surface, velocity, and pressure measurements were performed for a range of flow conditions. The results showed the rapid flow distribution at the upstream end of the weir and next to the weir brink at large flow rates. The flow properties above the crest were analyzed taking into account the...

We present a Lagrangian data assimilation experiment in an open channel flow above a broad-crested weir. The observations consist of trajectories of particles transported by the flow and extracted from a video film, in addition to classical water level measurements. However, the presence of vertical recirculations on both sides of the weir actually conducts to the identification of an equivalen...

The purpose of this research is examining the performance rectangular broad and sharp crested weirs in terms cavity index discharge coefficient. For purpose, a computational fluid dynamics CFD code FLUENT applied. Firstly, verified by applies on experiments work Hagre et al 1994 results show excellent agreements between Hager 1994. Secondly applied both weirs. demonstrate that have lower coeffi...

Abstract Weirs are hydraulic obstructions constructed across an open-channel flow causing a rise in water which is useful to convert the channels upstream as well using these structures measuring device. There different types, and sharp-crested weir one of them. Local scour downstream most critical problems affecting their safety stability. Many studies conducted prevent facilities from collaps...

A detailed experimental laboratory analysis of the effect crest shape on discharge coefficient sharp-crested weirs is presented in paper. The experiments were conducted for four different shapes. and analyses show that capacity, particular, are significantly affected by weir height. It stated conclusion rounded has highest capacity. In practice, sharp crested generally preferred to other shapes...