A cost model for plumbing and drainage systems

The construction cost, yearly maintenance cost and yearly remedial cost of plumbing and drainage systems in buildings were investigated. Occupancy, age, piping material, pipe length and the size of the systems were surveyed in 63 buildings. Correlations for costs of the systems in commercial and residential buildings were made with the surveyed results. Length, material and size of the pipes provide good parameters to determine the system construction costs. Higher maintenance cost and remedial cost for aged systems were reported. Remedial cost for corrosion problems increased significantly for the aged systems.