Design, Supply and Installation the following : * R.C. pipelines of 600 : 1800 mm dia and 22.553 km total length. * G.R.P. pipelines of 300 : 500 mm. dia. and 9.264 km. total length. * 353 Nos. Manholes of 1.5 m : 3.2 m dia. * Outfall Structure on Gulf