Table 1

Classification of BW scarcity and the FLK index into different categories

BW
FLK index
BW scarcityCategoryInterpretationFLK (m3/capita/year)Threshold/category
<100% Low BW scarcity BWF does not exceed the BWA. The ERF is satisfied at this level. >1,700 No stress 
100–150% Moderate BW scarcity BWF is between 20 and 30% of natural runoff. EFR is not satisfied. 1,000–1,700 Stress 
150–200% Significant BW scarcity BWF is between 30 and 40% of natural runoff. EFR is not satisfied. 500–1,000 Scarcity 
>200% Severe BW scarcity BWF exceeds 40% of natural runoff. EFR is not satisfied. <500 Absolute scarcity 
BW
FLK index
BW scarcityCategoryInterpretationFLK (m3/capita/year)Threshold/category
<100% Low BW scarcity BWF does not exceed the BWA. The ERF is satisfied at this level. >1,700 No stress 
100–150% Moderate BW scarcity BWF is between 20 and 30% of natural runoff. EFR is not satisfied. 1,000–1,700 Stress 
150–200% Significant BW scarcity BWF is between 30 and 40% of natural runoff. EFR is not satisfied. 500–1,000 Scarcity 
>200% Severe BW scarcity BWF exceeds 40% of natural runoff. EFR is not satisfied. <500 Absolute scarcity 

BWF, blue water footprint; EFR, environmental flow requirement; FLK, Falkenmark.

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