Defining direct and indirect targets

CYANO-
TOXIN
 

 

Drinking-water: Abstraction and treatment
 

RECREATION: Information, Warning, Closure of site
 
 

 

 

 

 

CYANOBACTERAL
BIOMASS
 
Targets set for cyanotoxin concentration
in water can be achieved by meeting
a target for cyanobacterial biomass
in the water-body.
                  

WATERBODY: PHOSPHORUS CONCENTRATION
 
This can be achieved by meeting
a target for the total phos-
phorus concentration
in the water-body.

 

 

catchment: phosphorus load
 
This may be achieved by meeting
a target for the phosphorus
load from the catchment
to the water-body
(in many cases).

 

 

Where meeting cyanotoxin
   targets in the water-body
      fails, targets need to be
set “downstream” for:  

·        drinking-water treat-
  ment performance
    to get toxins out
      of the water;

·        public communi-
cation to keep
    people out
      of   the
water.

 

 

Document the targets you have decided to set for your specific water-body and/or drinking-water supply as well as your rationale for setting the levels you have chosen. A table is provided in the worksheet with this decision support tool for this purpose.

 

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On to: Step 2 – compile a team with the necessary expertise for your risk and system assessment