Our specialist team held a technical briefing with customers on the 3.6MW hydropower project.

This project was recommended to us by the client in May this year through the owner of a project already under construction in KG. The client paid our survey and design charges and commissioned us to conduct an on-site survey to obtain accurate data before starting the design work.

We also discussed several important issues between customer and us for the concerned questions as following:

 1.Rainfall catchment area: We let the client to ask the local competent department, which is the department that described to you the possibility of large-volume mountain torrents , to provide an accurate data on the catchment area and average rainfall of the river upstream of the power station site. Based on the catchment area, we can basically accurately calculate the inflow during the flood season. Or, please ask the competent department of your organization to provide an accurate river flow change table, preferably in the last 30 years. If possible, it would be more accurate if it is provided in the last 50 years. According to Chinese hydro power station construction standards, the dam can withstand a flood that occurs once every 30 years, and the power station plant can withstand a flood that occurs once every 50 years.

2. Snow melt water : According to several in-depth field investigations by our team and the reference conditions provided by the customer, the river water source at the location of this project is basically seasonal snow melt water. According to the law, the main factor affecting the flow change of rivers dominated by snow melt water is temperature. Therefore, according to the local address conditions, even if the temperature rises rapidly in extreme weather, the possibility of rapid melting of snow and forming spring floods is very small.

3. Overflow :

For this problem, （Too much actual data is omitted here about 1000 words ）According to the above listed data, under the working condition of the dam to meet the peak of the flood, at least 170m³/s of flow can be safely passed. In the report you submitted initially, although it was a long time ago, I remember that the maximum flow was     m³/s. We also repeatedly confirmed with you on the site, and you also repeatedly confirmed that the maximum flow would not exceed      m³/s. So the current ability of our hydro power station to meet the possible peak of the flood after completion is also safe enough.

4. With debris entering the reservoir:

Water storage hydro power stations will face the problem of debris entering the reservoir, including stones, wood, grass roots and other debris.

After the dam is filled with water, the water flow rate entering the reservoir will be very slow.

After the stones enter the reservoir, as the flow rate slows down, they basically settle at the water inlet of the reservoir area, and will not cause damaging impacts on the dam.

Dry season can be cleaned manually for secondary use.

Most of the wood and wooden debris entering the reservoir are drifting objects, which can be discharged regularly through the overflow port. If you want to reuse them, you can also arrange for special scooping for secondary recycling.

The reference of the figure below can clearly see that debris is discharged regularly through the overflow port, usually silted up on both sides of the dam, and after accumulating to a certain extent, the dam water is discharged through the overflow port.