This is a literature review of a Trapezoidal Jump Eliminator, otherwise known as a Threshold Eliminator. The purpose of this paper is to understand the design principles behind the Trapezoidal Jump Eliminator, and to determine the effectiveness of the Eliminator in controlling the accumulation of flow in a drainage system.
The Trapezoidal Jump Eliminator is a flow control structure designed to prevent the accumulation of water in a drainage system. The design incorporates the use of a series of slopes, called trapezoids, of varying lengths and steepness, mounted on a flat structure. These trapezoids are arranged in non-overlapping sequences and are intended to reduce the speed of the water entering the structure and prevent flow reversal. This arrangement of trapezoids is intended to be spaced to reflect the relationship between the flow force and the discharge of the drain.
When the flow of water passing through the trapezoidal structure reaches a certain level, the upslope of the trapezoid will cause the water to travel at a slower speed thus reducing the turbulence and allowing for a controlled flow of water. This controlled flow is what is referred to as the “threshold” of the Trapezoidal Jump Eliminator. The main advantage of the Trapezoidal Jump Eliminator is that it prevents the accumulation of water in the downstream system.
In terms of design principles, the Trapezoidal Jump Eliminator can be divided into two types: vertical and horizontal structures. A vertical structure has a series of trapezoids, arranged in a vertical direction, each with a longer length than the previous one. The difference between the long and short lengths of the trapezoid is known as the “Pitch”, and the slopes of the trapezoid are called the “Friction Slope”. The greatest advantage of this type of structure is that it is much easier to install, as the slope of the trapezoid can be adjusted to meet the specific needs of the project.
A horizontal structure, on the other hand, has a single trapezoid, mounted horizontally on a supporting structure. The main advantage of this type of structure is that it allows for a much greater variance in the gradient of the trapezoid. This is especially important where steep gradients are needed.
In terms of efficiency, the Trapezoidal Jump Eliminator has been proven to be effective in controlling the accumulation of flow in a drainage system. It is particularly effective when used in conjunction with other drainage control measures, such as drainage ditches and drainage systems. The Trapezoidal Jump Eliminator has also been shown to be effective in reducing sedimentation and controlling pollution levels.
In conclusion, the Trapezoidal Jump Eliminator is a relatively simple and effective flow control structure that can be used to prevent the accumulation of water in a drainage system. It is relatively easy to install and can be fitted with a variety of different slopes to better meet the needs of a project. The structure effectively reduces the speed of the flow, allowing for a more controlled environment, and has been proven to reduce sedimentation and pollution levels.
