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Table 3

RoF and maintenance for main sewer lines along several streets in downtown Port of Spain

Main sewer line/streetRoF levelaPreventive maintenance intervalb (months)
Wrightson Roadc 21 
South Quay 14 
Independence Square Street 14 
Charlotte Street 14 
Ariapita Avenue 13 
Tragarete Road 12 
Mucurapo Road 12 
Cipriani Boulevard 11 
Frederick Street 11 
Maraval Road 11 
Woodford Street 18 
Main sewer line/streetRoF levelaPreventive maintenance intervalb (months)
Wrightson Roadc 21 
South Quay 14 
Independence Square Street 14 
Charlotte Street 14 
Ariapita Avenue 13 
Tragarete Road 12 
Mucurapo Road 12 
Cipriani Boulevard 11 
Frederick Street 11 
Maraval Road 11 
Woodford Street 18 

aDetermined from Figure 3, rounded to the nearest integer (some LoF and CoF values are shown in Table I).

bThe recommended maintenance frequency of 2 months for streets with RoF scores higher than 10 (high priority) has been estimated from the average time that a WWCS failure occurred during the 3-year period considered in this study. From the data available (WASA), it was estimated to be around 1.8 months, therefore 2 months for the minimum interval time would be adequate. The 18-month recommended maintenance interval for streets with RoF scores between 0 and 10 (low and medium priority) was taken from the longest time that it took an (SSO-related) failure to occur at a street/main sewer line out of all failures considered in this study.

cWrightson Road contains a (buried) trunk sewer Line (refer to Figure 2).

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