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Table 1

Lof and CoF (Nelson et al.; Chughtai & Zayed 2008; Rossi 2015; Laakso et al. 2018a) estimation for main sewer lines along three representative streets in downtown Port of Spain

Factor (weight fraction)a/LoF, CoFWrightson RoadbAriapita AvenueWoodford Street
Pipe material and age (0.3) (LoF) 
Pipe depth (0.2) (LoF) 
Vehicular traffic (0.1) (LoF) 
Distance from restaurants (0.3) (LoF) 
Soil type (0.1) (LoF) 
LoF 4.2 3.5 2.3 
Distance from commercial areas (0.4) (CoF) 
Vehicular traffic (0.2) (CoF) 
Distance from watercourses (0.4) (CoF) 
CoF 5.0 3.8 2.4 
Factor (weight fraction)a/LoF, CoFWrightson RoadbAriapita AvenueWoodford Street
Pipe material and age (0.3) (LoF) 
Pipe depth (0.2) (LoF) 
Vehicular traffic (0.1) (LoF) 
Distance from restaurants (0.3) (LoF) 
Soil type (0.1) (LoF) 
LoF 4.2 3.5 2.3 
Distance from commercial areas (0.4) (CoF) 
Vehicular traffic (0.2) (CoF) 
Distance from watercourses (0.4) (CoF) 
CoF 5.0 3.8 2.4 

aThe weight fraction values assigned for each factor are explained in the text.

bWrightson Road contains a (buried) trunk sewer line (refer to Figure 2).

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