Tender Documents

Extension of the water supply network of Karditsa

Design revision was necessary due to the network’s extension. The works included:
- The total network (old and new) consists of 2683 nodes and 3273 links.
- The range of selected diameters is varied between 60mm to 600mm of 120 Km total length.
- The design needs of the client required the provision and specification of measuring and control devices, water leakage detection and SCADA automated network control.

Volos greater region water supply network

 - The computational magnitude of the network is major and includes:
    o The lower zone with 11161 links and 7502 nodes
    o Middle zone Μ1 with 2250 links and 1479 nodes
    o Middle zone Μ2 with 102 links and 69 nodes
    o Hgher zone with 235 links and 153 nodes
 - Both uniform and separated zone distribution network calculations were made
 - The project includes a circumferential distribution water mains for the regulation of the tanks’ supply and the ability for two-way water flow.

Revision of the Volos water supply network study

The revision concerns the pipe material, slight alteration of the pressure zones and details regarding the operational structure of the network, in order to facilitate water leak detection efforts.
The design specification require the implementation of proper measuring gauges and control devices, intended for the central SCADA automated network management and the facilitation of leakage detection.
The works include:
 - The model size is 10400 nodes and 15675 links, with a total length of 745km

Preliminary study and tender documents for the water treatment plant of Rhodes

The Gadouras Dam Reservoir supplies the water treatment works. The treatment works are part of the overall water supply scheme of Rhodes from Gadouras.
The works included:
- The plant consists of inlet works, polyelectrolyte and alum dosing and storage facilities, sludge blanket clarifiers, rapid gravity filters, disinfection units and potable water storage tanks.
- The maximum design flow is 60.000 m3/day for the first phase and 120.000 m3/day for the final phase.

Technical consultant for the Amira-Ag Vassilios dam

The project consists of the following individual works:
- The main embankment dam
- The spillway (collector, spillway canal, flip bucket, plunge pool)
- The diversion works which are combined with the intake and reservoir evacuation works.
Specifically:
- The dam is 48 m heigh with an impermeable core. The embankment cross section is trapezoid with a 2:1 (v:h) slope inclination and upstream-downstream berm provision.
- The diversion works are formed prior to the main fill construction. The 4mx4m rectangular culvert is 377 m long.

Schinas dam in Karpathos

The Schinas dam will be regulated along with the Vroutsas dam. The total project is part of the general water resources management project for the island of Karpathos, and also operates as a flood protection scheme.
The works include:
- The Schinas dam is of rockfill type with a clay impervious core .
- Height 31m. Crest length 242m. Crest width 8m.
- Embankment volume 420.000m3
- Total reservoir net volume 1.100.000m3.
- Maximum reservoir water surface 141.000m2.

Vroutsas dam in Karpathos

The Vroutsas dam will be regulated along with the Schinas dam. The total project is part of the general water resources management project for the island of Karpathos, and also operates as a flood protection scheme.
The works include:
- Vroutsas dam is a rockfill dam with an impervious clay core.
- Height 21m. Crest length 272m. Crest width 7m.
- Total dam volume 246.000m3
- Total net reservoir volume 256.000m3
- Maximum reservoir water surface 68.000m2

Water mains from Gadouras dam to the city of Rhodes

The future water needs of Rhodes will be covered by Gadouras dam and reservoir. This project covers the final design stage of all the water mains and other structures necessary, from the reservoir to the regulating tanks of the water supply network of the city of Rhodes.
The works included:
- Construction of a steel pipeline of diameters varying from Ø1300 to Ø800, with a total length of 50km, including an 800m tunnel
- Construction of a maintenance access road

Design of the water supply extension of the Gadouras dam pipelines

The project involves the extension of the existing pipeline to a wider area, covering potable water needs around the island, substituting weak underground resources.
The pipeline design extends to a total of 130km and includes numerous related infrastructure such as control tanks and devices and pumping stations.

Design of water supply works (pipelines-treatment plant) for Athens

Designed works include:
    o A main 6.25Km long external pipeline with diameter 1700mm and 5.5 m3/sec flow rate.
    o Capacity audit of the 13Km long Mpogiatiou water tunnel (constructed in 1930) for flow rate Q=10.0 m3/sec. Design of:
       ▫ Water works for the connection of Mpogiatiou water tunnel with the grit removal tank
       ▫ The grit removal tank
       ▫ Power plant station including a water energy production turbine and a D1700mm pipe.

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