Rule-based risk level
Will the Chao Phraya at Ayutthaya reach its bank within the next 24 hours?
Risk level from a simple rule
Not an official warning Follow guidance from the DDPM and the BMA.
Move the pointer over the river to turn it.
How the level is decided
Rule B2 checks the latest reading at Ayutthaya from the top down and stops at the first match.
What the rule looked at
River level at Ayutthaya (station 39), in metres above mean sea level
Along the Chao Phraya
North to south. Context only: the rule uses Ayutthaya alone.
How it did on past floods
Hours of warning before the river first reached its bank at Ayutthaya
- Watch or higher
- Warning or higher
- Too late
Warned before the bank was reached in 4 of 5 floods at Watch or higher.
Only 5 floods reached the bank at Ayutthaya from 2020 to 2025.
Recent risk checks
Admins only. The server stores one row each time the risk is checked.
What this is, and what it is not
A rule, not an AI model
A level, not a probability
Ayutthaya, not your street
Odd readings are set aside
No reading, no guess
Fast rises can slip through