How to determine the downstream water level in a deep digging dissipation tank

I don't understand what you mean by "pushing backwards from the outlet of the outlet to the water level downstream of the dissipation pond for the critical flow", the downstream water level has nothing to do with whether the end of your dissipation tank is a deep digging type or a sill-breaking type or a comprehensive type, and the outlet water level is found out according to the water level and flow relationship curve at the outlet.

The construction of control gates on the river is used to intercept the incoming water from the upstream and raise the water level for water diversion and irrigation, water supply, etc.

In order to ensure the safety of flood discharge, when the water level difference between the upstream and downstream is small (such as the need to discharge a certain flow rate safely, the total net width of the corresponding gate hole is required.

Because the size of the head difference will affect the size of the flow through the gate, which will also affect the scale of the project. During the period of closing the sluice and impounding water, the water level difference between the upstream and downstream is often very large, and when the sluice gate is opened and the water is discharged (from the perspective of the discharge form, it is from the hole flow to the weir flow), the downstream water level will slowly rise, that is, the water level difference between the upstream and downstream has a process of narrowing. In this process, the energy dissipation situation is also constantly changing.

At the time of the initial discharge, the downstream water level is generally low, and the energy dissipation problem is relatively prominent. As the water level in the downstream rises, the inundation degree of the water jump increases, and the energy dissipation conditions will be improved.

When calculating the energy dissipation man, several discharge volumes can be used to calculate the water depth after the jump, and compare it with the downstream water depth, and then select the flow rate corresponding to the most unfavorable situation as the design flow rate to determine the depth of the dissipation pool. The design flow rate for determining the length of the dissipation cell is not necessarily the same as the design flow rate when determining the depth, and it also needs to be determined by the corresponding combination.

In principle, the downstream water depth should be determined according to the water level flow relationship curve (which can be calculated according to the measured data or according to the uniform flow of open discharge), but the situation is often not simple in the actual engineering design, especially for small sluices.

The upstream water level is relatively easy to determine, as there will always be a normal water storage level at the time of design, in addition to the possibility of a maximum water level, a limit water level, etc., so the key depends on the selection of the downstream water level, but there is no completely one-size-fits-all approach.

Therefore, it is possible to combine the current situation of the river channel with the practical application requirements, select several characteristic water levels (generally unsafe, sometimes assume the extreme situation of no water downstream), and then combine them with the upstream characteristic water level to calculate the parameters of its energy dissipator.

Building water supply and drainage design, especially high-rise building water supply and drainage design, each system has different technical and use requirements for water pumps. In order to make each system can be put into operation normally, safely and efficiently, the selection of pumps in water supply and drainage design should comprehensively consider the characteristics, parameters, scope of application, production technical strength of pump manufacturers and pump quality and other factors. For the newly developed pump, it is especially necessary to understand the various technical parameters and scope of application, so that the water supply and drainage system can be stable, safe and economical.

Hello, I am very happy to serve you, and I will give you the following answer: The function of the reservoir spillway dissipation pool is to reduce the impact force of the overflow of the Punzu reservoir to prevent the flood from causing damage to the surrounding environment. Workaround:

1.First of all, it is necessary to determine the location of the reservoir spillway dissipation tank in order to effectively reduce the impact of the flood. 2.

Secondly, the size of the dissipation tank should be determined in order to meet the flood discharge requirements. 3.Then, the depth of the dissipation tank is determined in order to meet the flood discharge requirements.

4.Finally, it is necessary to determine the building materials of the trouser bending force pool in order to meet the flood discharge requirements. Personal Tips:

In the construction of the reservoir spillway dissipation pool, it is necessary to comprehensively consider the discharge requirements of the flood, and determine the location, size, depth and building materials of the dissipation pool, so as to effectively reduce the impact of the flood and prevent the flood from causing damage to the surrounding environment.