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As discussed earlier, the FI is used to show the water stress of a region. Table 6 shows the improvement in this indicator in Iran if reuse schemes are implemented. In fact, with four possible strategies (25, 50, 75, and 100% reuse) that the government can adopt for potential reuse in the three major sectors (agriculture, industry, and municipal), improvement in the FI is achievable. The quantity of WD, Pw, and country population (CP) are presented for 2021 (1,400 in terms of solar year) in Table 6, and the FI (m3/year/capita) is calculated according to different strategies.

Table 6

Improvement of FI according to different strategies

 WD (bcm)PWW (bcm)CP (M)FI from 25% reuse (m3/PCY)FI from 50% reuse (m3/PCY)FI from 75% reuse (m3/PCY)FI from 100% reuse (m3/PCY)
Agricultural 94.5 30 81 92.5 185 277.5 370 
Industrial 2.1 1.08 3.3 6.6 9.9 13.2 
Municipal 6.5 5.2 16 32 48 64 
Total improvement of FI 111.8 223.6 335.4 447.2 
 WD (bcm)PWW (bcm)CP (M)FI from 25% reuse (m3/PCY)FI from 50% reuse (m3/PCY)FI from 75% reuse (m3/PCY)FI from 100% reuse (m3/PCY)
Agricultural 94.5 30 81 92.5 185 277.5 370 
Industrial 2.1 1.08 3.3 6.6 9.9 13.2 
Municipal 6.5 5.2 16 32 48 64 
Total improvement of FI 111.8 223.6 335.4 447.2 

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