Table 3 The relative weights of the...

Table 3

The relative weights of the selected elements

Criteria	Weight	Sub-criteria	Weight	Indicators	Weight
Physical	0.354	Diameters (mm)	0.182	Ф < 100	0.061
				100 ≤ Ф ≤ 200	0.134
				201 ≤ Ф ≤ 300	0.259
				Φ > 300	0.545
		Types of Materials	0.265	CA	0.353
				PVC	0.328
				HDPE	0.155
				Steel	0.111
				Melting	0.053
		Length (m)	0.089	Lg < 100 m	0.092
				100 ≤ Lg ≤ 300	0.104
				301 ≤ Lg ≤ 600	0.276
				Lg > 600	0.529
		Age of the pipe (years)	0.367	Age < 10	0.098
				10 ≤ Age ≤ 30	0.186
				30 < Age ≤ 50	0.277
				Age > 50	0.439
		Corrosion protection	0.062	Internal	0.087
				External	0.274
				No	0.639
		Seals	0.035	Glued	0.369
				Bonded with cement	0.354
				Mechanical	0.135
				Thermo fusions	0.096
				Welded	0.047
Operational	0.556	Pressure (bars)	0.348	Pr < 2	0.098
				2 ≤ Pr ≤ 6	0.334
				Pr > 6	0.568
		Velocity (l/s)	0.120	V < 0.5	0.060
				0,5 ≤ V ≤ 1.5	0.282
				V > 1.5	0.658
		Failures	0.325	0	0.093
				1 ≤ F ≤ 3	0.221
				F > 3	0.685
		Drinking water quality	0.041	Aggressive	0.260
				Not Aggressive	0.106
				too aggressive	0.633
		Network maintenance	0.166	Good	0.106
				Medium	0.260
				Bad	0.633
Pipe environment	0.090	Soil Types	0.185	NonCorrosive Soil	0.333
		Soil Types	0.185	Corrosive Soil	0.667
		Laying bed (cm)	0.265	Absent	0.589
				Lit ≤ 10	0.252
				Lit > 10	0.159
		Groundwater	0.074	Present	0.750
		Groundwater	0.074	Absent	0.250
		Pipe depth	0.099	Pro < 1	0.633
				1 ≤ Pro ≤ 2	0.260
				Pro > 2	0.106
		Traffic	0.319	Main road	0.656
				Secondary route	0.265
				pedestrian crossing	0.080
		Genoa because of other networks	0.058	Installation of another network	0.343
				Road works	0.575
				Repair	0.082

Criteria	Weight	Sub-criteria	Weight	Indicators	Weight
Physical	0.354	Diameters (mm)	0.182	Ф < 100	0.061
				100 ≤ Ф ≤ 200	0.134
				201 ≤ Ф ≤ 300	0.259
				Φ > 300	0.545
		Types of Materials	0.265	CA	0.353
				PVC	0.328
				HDPE	0.155
				Steel	0.111
				Melting	0.053
		Length (m)	0.089	Lg < 100 m	0.092
				100 ≤ Lg ≤ 300	0.104
				301 ≤ Lg ≤ 600	0.276
				Lg > 600	0.529
		Age of the pipe (years)	0.367	Age < 10	0.098
				10 ≤ Age ≤ 30	0.186
				30 < Age ≤ 50	0.277
				Age > 50	0.439
		Corrosion protection	0.062	Internal	0.087
				External	0.274
				No	0.639
		Seals	0.035	Glued	0.369
				Bonded with cement	0.354
				Mechanical	0.135
				Thermo fusions	0.096
				Welded	0.047
Operational	0.556	Pressure (bars)	0.348	Pr < 2	0.098
				2 ≤ Pr ≤ 6	0.334
				Pr > 6	0.568
		Velocity (l/s)	0.120	V < 0.5	0.060
				0,5 ≤ V ≤ 1.5	0.282
				V > 1.5	0.658
		Failures	0.325	0	0.093
				1 ≤ F ≤ 3	0.221
				F > 3	0.685
		Drinking water quality	0.041	Aggressive	0.260
				Not Aggressive	0.106
				too aggressive	0.633
		Network maintenance	0.166	Good	0.106
				Medium	0.260
				Bad	0.633
Pipe environment	0.090	Soil Types	0.185	NonCorrosive Soil	0.333
		Soil Types	0.185	Corrosive Soil	0.667
		Laying bed (cm)	0.265	Absent	0.589
				Lit ≤ 10	0.252
				Lit > 10	0.159
		Groundwater	0.074	Present	0.750
		Groundwater	0.074	Absent	0.250
		Pipe depth	0.099	Pro < 1	0.633
				1 ≤ Pro ≤ 2	0.260
				Pro > 2	0.106
		Traffic	0.319	Main road	0.656
				Secondary route	0.265
				pedestrian crossing	0.080
		Genoa because of other networks	0.058	Installation of another network	0.343
				Road works	0.575
				Repair	0.082

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