ANNEX 7 Alert thresholds for water pollution incidents in the
framework of the international Danube Accident Emergency Warning
System

The following tables provide guideline for the determination of alert thresholds levels
for the Principal International Alert Centres (PIAC) and warning messages. If the
values in the tables are exceeded in the case of an accidental release of some
substances into surface waters a warning message has to be launched by relevant
PIAC according to AEWS International Operation Manual.


Thresholds for warning message

Substance classifications
flow rates
flow rates
below 1000 m3/s
above 1000 m3/s
Water



Risk
R - phrases
Substance amount
Substance amount
Class
(kg) or (l)
(kg) or (l)




"0"
- 22
100 000
1 000 000




1
- 25, 52/53, 52 or 53
10 000
100 000

- 50, 51/53, 28 or 45


2
- (52/53, 52 or 53)
1 000
10 000
and (22 or 25)


- 50/53


3
- (50, 51/53, 52/53, 52 or 53)
100
1 000
and (45 or 28)
- 45 and 28



Water Risk Index (WRI)
2
3


The substances most frequently released by accidents in the Danube catchment area
are heterogeneous groups of substances and mixtures and dominating substances are
the oil compounds. The alert thresholds for the substance mixture can be
characterized by classifying the corresponding indicator substance.

For non-specified oils, quench water suspended ash and slurry the following alert
thresholds are applied:

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Thresholds for warning message


flow rates
flow rates
Released substance mixture
below 1000 m3/s
above 1000 m3/s
Substance mixture
Substance mixture
amount
amount
(kg) or (l)
(kg) or (l)



Oils (non-specified)
1 000
10 000




Quench water (fire extinguishing water)
10 000
100 000




Slurry and Sewage (animal)
10 000
100 000
Suspended ash
100.000
1.000.000

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