The Influence of Engineering Software for the Design and Analysis of Urban Storm Drainage
The national capital investment in sewerage has been estimated as being in excess of £42 billion . With an average number of sewer collapses of 16/100 km per year and a total length of sewers the order of 234000 km a large cost is being born by the nation in maintaining existing sewers. Nationally the annual expenditure on sewers is of the order of £200m of which £70m is spent on structural deficiencies and £l20m on problems due to lack of capacity. Because many of our sewers are more than 50 years old the problem of maintaining existing sewers is increasing. Consequently considerable research investment has been made into sewer rehabilitation techniques leading to the publication of a manual by the Water Research Centre . Two key phases of the procedure recommended in the manual involve the assessment and remedy of structural and hydraulic deficiencies in a sewer system. Integral to the hydraulic assessment is the ability of the engineer to study the performance of a given system in fulfilling its designed intention to convey sewage economically and efficiently to its intended destination.
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