If Sewer Pipes and Drain Pipes are cleared periodically, then the ineffective drainage of rainwater, as well as an overflow of water onto the road can be prevented.

Also, when road surfaces are periodically cleared, slippage accidents due to dust, grit and debris left after snow has melted in spring can be prevented.

The photo on the right shows the clearing of road surface.

2   This photos shows the removal of mud which has been stuck in ditch.  
3   This photo shows the removal of sediment mud from drainage pipes.  
4   This is a slightly different type of work, but it shows the clearing of a river.