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Table 7

Economic intervention of reducing the real losses in the network

 Variable cost of real lossesValueUnit cost
CV Variable production cost (applied to real losses) 0.47 $/m3 
 474.85 $/ML 
CI Cost of comprehensive leak detection survey (excluding leak repair cost) 100.00 $/km 
RR Average rate of rise of unreported leakage 3.00 m3/km of mains/day in a year 
 2.58 ML/day in a year 
CI/CV 210.6 m3/km 
EIF Economic intervention frequency [0.789 * (CI/CV)/RR] ^0.5 7.4 months 
Economic intervention frequency – average leak run time 113.2 days 
Economic percentage of system to be surveyed per year 161 
ABI Average annual budget for intervention (proactive leak detection) 138,508 $/year 
EUL Economic unreported real losses 291,688 m3/year 
Economic Infrastructure Leakage Index (ILI) 2.1  
PRL Potentially recoverable leakage (CARL-CRL-EUL-TBL-UL) 438.0 ML/year 
 Variable cost of real lossesValueUnit cost
CV Variable production cost (applied to real losses) 0.47 $/m3 
 474.85 $/ML 
CI Cost of comprehensive leak detection survey (excluding leak repair cost) 100.00 $/km 
RR Average rate of rise of unreported leakage 3.00 m3/km of mains/day in a year 
 2.58 ML/day in a year 
CI/CV 210.6 m3/km 
EIF Economic intervention frequency [0.789 * (CI/CV)/RR] ^0.5 7.4 months 
Economic intervention frequency – average leak run time 113.2 days 
Economic percentage of system to be surveyed per year 161 
ABI Average annual budget for intervention (proactive leak detection) 138,508 $/year 
EUL Economic unreported real losses 291,688 m3/year 
Economic Infrastructure Leakage Index (ILI) 2.1  
PRL Potentially recoverable leakage (CARL-CRL-EUL-TBL-UL) 438.0 ML/year 
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