Storage dam
Ratchaprapha Dam
เขื่อนรัชชประภา
Ratchaprapha Dam is a storage dam on the Phum Duang River in Ban Ta Khun District, Surat Thani province. Its reservoir holds 5,639 million m³. It was completed in 1987 and is run by the Electricity Generating Authority of Thailand (EGAT). Commonly called the Chiew Larn Dam. It dams Khlong Saeng, a tributary of the Phum Duang River.
Reservoir storage today
73.9% of capacity at normal storage level
- Water in the reservoir
- 4,164 million m³
- Inflow
- 11.5 million m³ a day
- Released
- 5.1 million m³ a day
As of 30 Sep 2026 Data from the National Hydroinformatics Data Center (ThaiWater), HII, refreshed every 10 minutes
Key facts
- River
- Phum Duang River
- Location
- Ban Ta Khun District, Surat Thani province
- Coordinates
- 8.9727, 98.8068
- Reservoir capacity
- 5,639 million m³
- Dam height
- 95 m
- Dam type
- Rockfill dam
- Installed power capacity
- 240 MW
- Completed or opened
- 1987
- Operator
- Electricity Generating Authority of Thailand (EGAT)
Frequently asked questions
- Where is Ratchaprapha Dam?
- Ratchaprapha Dam is in Ban Ta Khun District, Surat Thani province.
- What is the water level of Ratchaprapha Dam today?
- Ratchaprapha Dam is 73.9% full, holding 4,164 million m³, as of 30 Sep 2026.
- How much water can Ratchaprapha Dam hold?
- The reservoir of Ratchaprapha Dam holds 5,639 million m³.
- When was Ratchaprapha Dam built?
- Ratchaprapha Dam was completed and opened in 1987.
- Who runs Ratchaprapha Dam?
- Ratchaprapha Dam is run by the Electricity Generating Authority of Thailand (EGAT).
- What is the Ratchaprapha Dam called in Thai?
- In Thai the Ratchaprapha Dam is เขื่อนรัชชประภา.