FAULTY PLANNING

is one of the reasons why workers have to continue to manually clean sewers, says Roy. Sewer lines are becoming longer with centralised Sewage Treatment Plants (STPs). Smaller sewer lines with decentralised STPs will reduce risk of clogging. The slope of the lines have to be accurate and concrete sewers need to be lined with something smooth inside to aid the flow of sewage. Sewers need to be broadened for easy operation of machines.