As it goes Western Civilization owes a huge amount to the ancient Greeks. Not only did they give us scientific mathematical principles like Pi and Pythagoras theorem they also formed the first arguments in philosophy, developed medicine, architecture and produced art. Important as these all are one of other things they were good at was sewers and drainage. To be fair they had had a bit of help in this matter. The Greeks were influenced by Civilizations in the Middle East such as the Persians and the Babylonians. These societies had learned from the people of the Indus Valley .
The main exponents of the system of sewerage and drainage was used primarily by the Ancient Minoans on the Island of Crete. Whilst not on the mainland, the Minoans traded heavily with the City state of Athens. The passage of ideas is just as ripe as that of goods. The Minoans huge capital and palace at Knossos still retains the systems as was. The Minoans used local water streams to flow through the city into communal areas where waste could be removed.
As with any drainage system they must have become blocked. In what must have been a disappointment to the Minoans, they did not have the use of a Blocked Drains Essex based company. The company in question 3Flow Block Drains in Essex can easily deal with any problems drain wise that you have. The clever Minoans were able to come up with a spigot and bell joint that was sealed in a primitive cement. They even started to make use of the rain water.