Storage dam
Prasae Reservoir
อ่างเก็บน้ำประแสร์
Prasae Reservoir is a storage dam in Wang Chan District, Rayong province. Its reservoir holds 295 million m³. It is run by the Royal Irrigation Department.
Reservoir storage today
96.7% of capacity at normal storage level
- Water in the reservoir
- 285 million m³
- Usable water
- 265 million m³ (96.5% of usable capacity)
- Inflow
- 0 million m³ a day
- Released
- 0.8 million m³ a day
As of 14 Nov 2026 Data from the National Hydroinformatics Data Center (ThaiWater), HII, refreshed every 10 minutes
Storage this year and last
Down 0.5 million m³ over the last 7 days
9.2 million m³ less than on the same day last year
- 2026
- 2025
- Normal storage 295 million m³
- Upper and lower rule curves
Daily storage from the National Hydroinformatics Data Center (ThaiWater). The rule curves are the range the dam is meant to be kept within through the year.
Try the reservoir
Change the inflow, the release and the rain over the dam's catchment, and see what the reservoir would do over the next 90 days, starting from today's figures.
The reservoir would fall by 0.8 million m³ a day
Over the next 90 days the reservoir reaches neither normal storage, a rule curve nor dead storage
In 90 days it would hold about 218 million m³ (73.8% of capacity)
- Actual storage
- Projected
- Normal storage
- Upper and lower rule curves
- Dead storage
Today's storage, plus the inflow and the rain that runs in, less the release, a day at a time; evaporation and seepage are left out. It is arithmetic on the figures you set, not a forecast.
Key facts
- Location
- Wang Chan District, Rayong province
- Coordinates
- 12.9772, 101.5583
- Reservoir capacity
- 295 million m³
- Maximum capacity
- 322 million m³
- Dead storage
- 20 million m³
- Operator
- Royal Irrigation Department
Maximum capacity and dead storage from the Royal Irrigation Department
Frequently asked questions
- Where is Prasae Reservoir?
- Prasae Reservoir is in Wang Chan District, Rayong province.
- What is the water level of Prasae Reservoir today?
- Prasae Reservoir is 96.7% full, holding 285 million m³, as of 14 Nov 2026.
- How much water can Prasae Reservoir hold?
- The reservoir of Prasae Reservoir holds 295 million m³.
- Who runs Prasae Reservoir?
- Prasae Reservoir is run by the Royal Irrigation Department.
- What is the Prasae Reservoir called in Thai?
- In Thai the Prasae Reservoir is อ่างเก็บน้ำประแสร์.