A Parameter Classification System for Nonrevenue Water Management in Water Distribution Networks

Table 3

MOE’s evaluation index for deteriorated pipes.

Indirect evaluation (10 items, 100 points)		Direct evaluation (12 items, 100 points)
Pipe type (15); Pipe diameter (3); Inner pipe coating type (12); Outer pipe coating type (4); Elapsed years (37)	Soil type (7); Surrounding road (3); Connection method (5); Number of leaks (7); Water quality (7)	Pipe diameter (27.3); Pipe thickness (12.4); Coating thickness (8.5); Pipe external corrosion depth (3.2); External corrosion circumference (2.8); External surface coating anagement (4.4)	Thickness of sediment (14.9); Pipe internal corrosion depth (3.4); Internal corrosion circumference (3.2); Internal coating management (7.6); Thickness of scale (7.3); Hydraulic pressure (5.0)

Source: Waterworks Network Diagnosis Manual [39].