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- Plateau’s water diversion works (sinkholes, ditches, water intake works).
- A 3,5km long diversion tunnel with an inclination ~ 15%.
- Diversion tunnel water outlet (penstock length 3.5 km), electromechanical installations for lighting, gates etc
- Energy dissipation outlet works
The stormwater and drainage works design of the 180km2 basin refer to :
- The main higway, 19.235 km long
- Three (3) tunnels,
- Four (4) valley bridges,
- One (1) bridge (Vellias stream)
- Three (3) overpasses
- Eleven (11) underpasses.
- Three (3) interchanges : (α) Ag. Marinas - Stylidas(β) Stylidas - Karavomilou (γ) Karavomilou - Ahinou.
- Sideways and other local roads
- Temporary works during construction period.
It is a rockfill dam with clay core, 77m high and 560m crest length. The total volume of the dam is 2.700.000m3. The dam is founded on gneiss. Dam reservoir’s capacity is 12.000.000m3.
The spillway has discharge flow of 370m3/s (PMF), with maximum width 32m. The energy dissipation is achieved through a flip bucket and a steeling basin.
The cross-section of the diversion tunnel is of horseshoe shape with 150m radius. When the construction is over, it is converted to an intake and reservoir drain works.
Xerias river basin has an area of 174 km2 and extends from the town of Korinthos (North) to the Southern districts of the Korinthos Prefecture, at the frontier with Argolida. Xerias river flow is seasonal with intense fluctuations. The January 1997 storms caused serious disasters.
The works included:
- Open and closed parts combination with composite concrete/steel sections, 1330m long.
This project is part of the reallocation plan for the plain. Therefore the existing irrigation system is fully redesigned, taking into account the optimal utilisation of the available water resources.
The works included:
- The designed network covers an area of 160.000.000 m2.
- It is consisted of 9 irrigation zones, which are irrigated by pumping stations. Kerkini lake is the main supply reservoir providing water to all the irrigation zones through the main delivery canal.
- Downstream Control is used.
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.
- 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.
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
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.
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.
