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Description and operation of the network

EYDAP is responsible for the construction, operation and maintenance of the sewerage network in its area of competence, as defined by article 8 of Law 2744/99.

By sewerage network is meant:

· sewerage pipes

· all-flow pipes (old mixed network in the center of Athens)

· pumping stations, depression pipes, spillways

· any project aimed at collecting and transporting waste water to the final recipients  

The most important of the primary wastewater collectors are:

· The Central Sewer

· The Supplementary Central Sewer

· The Parakifissios WastewaterCollector

· The Central Coastal Collector  

Wastewater pipelines are usually gravity pipelines, although where necessary, pressurized pipelines are available.

The Attica sewerage system includes 44 pumping stations, mainly along the coastal front of Piraeus and the Saronic coast.

The wastewater, through the main collectors, is discharged to the Wastewater Treatment Plants.

Network maintenance

The maintenance of the network and malfunction repair is performed with continuous and immediate intervention by highly trained personnel using the appropriate equipment that is constantly upgraded.
Pipe damage in the sewerage network occurs due to blockage caused by the disposal of non-disposable materials, i.e. inert building materials, fats and oils and other objects, or the intrusion of adjacent tree roots.
Almost 80% of the network is digitally imaged, which contributes to the rapid response to problems encountered.

Proactive and effective problem management is achieved by:

- the use of high-tech Mobile TV Inspection Units (TV Inspection Vehicles) to detect faults

- the use of high-pressure tankers and recycled treatment water tankers in case of blockage or for cleaning pipes, respectively

- the use of No Dig Technology through TV Inspection Vehicles equipped with robotic machinery for making repairs without requiring excavation

- repair/reconstruction of sections of pipes or external branches (connections) to properties

- maintenance of pumping station electromechanical equipment

and the extensive use of modern digital systems:

- Digital Emergency Response Vehicle Fleet Management System (e-TRACK)

- Input and processing of data obtained from work performed by repair crews on the Sewerage Portal application. Since 2008, the Sewerage Network Division has maintained a comprehensive historical database (sewerage portal) of failures, investigations, open cut trenches and other activities which provides invaluable assistance in effectively responding to network failures, drawing up maintenance schedules, providing faster consumer service and formulating a targeted investment plan to replace problematic sewage pipelines in the network

- Pilot application of the on-line updating of the sewerage portal application fault log with field data

- Two-way interconnection of e-TRACK systems and sewerage portal for direct forwarding of alerts to vehicles in all sectors

- Input, processing and analysis of spatial network data in GIS environment

- Compilation and study of statistical analyses based on the aforementioned data and those from the 1022 Call Centre on the sewerage portal application

- Monitoring the operation of pumping stations with Remote Control - Telemetry (SCADA) systems. This system monitors, controls and safeguards the automated operation of pumping stations


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