Drainage Drains and sewers can become blocked or damaged. Land drainage Information on what riparian ownership is and your rights and responsibilities. Septic tanks and other systems In rural areas where there is no public sewer connection, small individual waste systems are used. What are drains, private and public sewers? A drain is a pipe that takes foul effluent from your premises to the public sewer, usually via a private sewer. If my foul sewer becomes blocked what can be done to clear the blockage? Clearing a blocked sewer can often be achieved by simply rodding the system with a series of drain rods.