A Qualitative Approach to Determine the Areas of Highest Inflow and Infiltration in Underground Infrastructure for Urban Area

Table 3

Sample value parameter for age, sewer system, and soil type.

FID	Pipe size (mm)	Pipe grade (%)	Age factor		Sewer system factor		Operational performance values	Soil type factors
			Age (years)	Value parameter	Sewer system	Assigned value parameter		Soil classification	Assigned value parameter
0	457.2	3.12	110	8	Lateral	8	8.00	D	10
1	609.6	3.33	112	8	Main	10	8.40	A	4
2	0	0	112	8	NA	10	7.77	A	4
3	381	0.89	117	9	Lateral	8	7.00	D	10
4	0	0	112	8	NA	10	7.37	A	4

FID: field identification.