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Table 6

Real loss in DN100 cast iron pipes in City DC

YearReal loss (m3)Number of leaksDetected loss (m3)Undetected loss (m3)Detection efficiency
2007 4,772,672 238 1,011,505 3,761,167 0.27 
2008 4,850,432 260 1,241,443 3,608,989 0.34 
2009 4,864,127 227 996,908 3,867,219 0.26 
2010 4,603,657 218 1,199,618 3,404,039 0.35 
2011 4,038,503 214 988,037 3,050,466 0.32 
2012 3,880,504 238 1,194,472 2,686,032 0.44 
2013 4,422,274 253 1,453,573 2,968,701 0.49 
2014 4,457,025 240 1,570,633 2,886,391 0.54 
YearReal loss (m3)Number of leaksDetected loss (m3)Undetected loss (m3)Detection efficiency
2007 4,772,672 238 1,011,505 3,761,167 0.27 
2008 4,850,432 260 1,241,443 3,608,989 0.34 
2009 4,864,127 227 996,908 3,867,219 0.26 
2010 4,603,657 218 1,199,618 3,404,039 0.35 
2011 4,038,503 214 988,037 3,050,466 0.32 
2012 3,880,504 238 1,194,472 2,686,032 0.44 
2013 4,422,274 253 1,453,573 2,968,701 0.49 
2014 4,457,025 240 1,570,633 2,886,391 0.54 
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