Consulting Engineers

Projects

Over the years we have undertaken a variety of projects around the globe, and have engaged in a variety of international partnerships to deliver cost-effective and innovative solutions worldwide, that would change the life of many people.
Through this time traveling has contributed to the successful completion of our projects, and has helped us understand the common problems of each society we were trying to help.
The interaction with our partners and the societies abroad keeps rewarding us with invaluable memories, a diverse work experience, fuels us with creativity, helps us build on our culture and keeps us motivated

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Final study and detailed design of patra – athens – salonica motorway, part from almyros exit to aerino junction, sta. 248+336 to sta. 286+740

Country: Greece
Client: -
Year: 1996 - 2002
Funding: -
Contract Value: -
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Final study and detailed design of patra – athens – salonica motorway, part from almyros exit to aerino junction, sta. 248+336 to sta. 286+740

Country: Greece
Client: -
Year: 1996 - 2002
Funding: -
Contract Value: -

This study concerned the re-evaluation of the detail design study of sewerage and drainage works during construction period at part of the national motorway from Almiros junction to Aerinos junction, STA. 248+336 TO STA. 286+740. Z&A has carried out all the final hydraulic and drainage study for the construction of Patra – Athens – Salonica – Evzonoi motorway of sections from STA. 248+336 to STA. 286+740, including interchanges in Almyros and Microthives (see figures 2 & 3). The study involved the road drainage system, the flood protection system from surrounding catchment areas with all the necessary hydraulic structures (ditches, culverts, etc).
This study concerned the re-evaluation of the detail design study of sewerage and drainage works during construction period at part of the national motorway from Almiros junction to Aerinos junction. It involved the road drainage system, the flood protection system from surrounding catchment areas with all the necessary hydraulic structures (ditches, culverts, etc).

Preliminary and detailed design of infrastructure works inside the industrial area of kozani town, west macedonia, north greece

Country: Greece
Client: -
Year: 2000 - 2001
Funding: -
Contract Value: -
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Preliminary and detailed design of infrastructure works inside the industrial area of kozani town, west macedonia, north greece

Country: Greece
Client: -
Year: 2000 - 2001
Funding: -
Contract Value: -

The industrial area (IA) of Kozani town is located about 6.5 km east of the town. The extent of the studied area was about 71 ha and the average elevation was at +670 m. The total study included: (a) preliminary and detailed design of main and access roads of the IA, (b) preliminary and detailed design of water supply network of the IA, (c) preliminary and detailed design of the sewerage and storm networks of the IA and (d) preliminary design of the WWTP installation.The design of the above networks was followed by redesign of local or regional urban planning on existing or new infrastructure facilities of the project’s area. Sewerage network was designed by separating the total study area into four (4) zones (sections) and the PVC pipes designed in lengths 127 m for D700, 137 m for D800, 185 m for D1000 and 379 m for D1200. Secondary sewerage network was designed with PVC pipes, series 41 and diameter D500. WWTP installation was implemented at the boundaries of the south side of the IA and designed to accommodate the higher organic strength and solids content in the water.
The industrial area (IA) of Kozani town is located about 6.5 km east of the town. The extent of the studied area was about 71 ha. The total study included: (a) preliminary and detailed design of main and access roads of the IA, (b) preliminary and detailed design of water supply network of the IA, (c) preliminary and detailed design of the sewerage and storm networks of the IA and (d) preliminary design of the WWTP installation.

Final design of the overland section of the main disposal wwtp pipe of salonica, central macedonia, north greece

Country: Greece
Client: -
Year: 1997 - 1998
Funding: -
Contract Value: -
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Final design of the overland section of the main disposal wwtp pipe of salonica, central macedonia, north greece

Country: Greece
Client: -
Year: 1997 - 1998
Funding: -
Contract Value: -

The study focused on the design and the implementation of a double 1600 mm cement disposal pipe of about 13 km long, with all the necessary apparent hydraulic structures. Scope of the project was to diverse the treatment water of Salonica WWTP from river Axios to Thermaikos Gulf. The project included: Detailed design for the reconstruction of the existing part of the pipe, 2.50 km long, detailed design for the construction of the new land part of the pipe, 7.84 km long, detailed design for the construction of the new underwater part of the pipe, 2.70 km long and design, support studies such as topographical survey, geological and geotechnical investigations and laboratory tests, environmental and socio-economic studies, etc. Tender documents , cost estimation, bidding documents were produced to support the Service for the implementation of the total project along with the supervision of construction.
The study focused on the design and the implementation of a double 1600 mm cement disposal pipe of about 13 km long, with all the necessary apparent hydraulic structures. Scope of the project was to diverse the treatment water of Salonica WWTP from river Axios to Thermaikos Gulf.

Technical consultant for the construction of evinos dam, etoloakarnania prefecture, west greece

Country: Greece
Client: -
Year: 1997 - 2002
Funding: -
Contract Value: -
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Technical consultant for the construction of evinos dam, etoloakarnania prefecture, west greece

Country: Greece
Client: -
Year: 1997 - 2002
Funding: -
Contract Value: -

Z&A as a partner of W.S. ATKINS INTERNATIONAL was involved in various hydraulic issues arising from the dam’s construction at Evinos River in West Greece such as checking contractor’s studies, consulting over various construction issues, etc. Works started in 1992 with the construction of the diversion tunnel and ended in July 2002 and launched the first filling of the reservoir of the Dam, which was completed in October 2002. The dam was designed to supply (through a 29.4 km tunnel) the reservoir of the Mornos Dam Reservoir of Athens and consists of an internal clay core, downstream gravel filters in order to prevent leakages and protective large stone bed in upstream side. Z&A was responsible for the review of all the Hydraulic detailed designs, submitted by the Contractor and also provided to the on site team, the Resident Engineer, the Chief Hydraulic and Structural Engineer.
Various hydraulic issues arising from the dam’s construction at Evinos River in West Greece such as checking contractor’s studies, consulting over various construction issues, etc. The dam supplies through a 29.4 km tunnel the reservoir of the Mornos Dam Reservoir of Athens. Z&A was responsible for the review of all the Hydraulic detailed designs, submitted by the Contractor and also provided to the on site team,the Resident Engineer, the Chief Hydraulic and Structural Engineer.

Pilot project for the athens water supply network upgrading and leakage control

Country: Greece
Client: -
Year: 1997 - 2003
Funding: -
Contract Value: -
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Pilot project for the athens water supply network upgrading and leakage control

Country: Greece
Client: -
Year: 1997 - 2003
Funding: -
Contract Value: -

EYDAP implemented a leakage level assessment and detection project for the water distribution network of Athens (with population of over 3,800,000 inhabitants). The overall project consisted of 12 parallel pilot projects in selected parts of the water supply distribution network of Athens. This pilot project for leakage control on the water supply system of Athens covered the areas of Glyfada, Argyroypoli, Elliniko, Voyla and Vari covering about 225 km of pipes. Total project was separated in two phases: INITIAL PHASE: The pilot project area initial field survey covered for map updating and appurtenance operational condition assessment and repair. Also: i. Water quality upgrade works, ii. Hydraulic model development, iii. Consumption data evaluation iv. Zone and sub-zone boundary proposal with BoQ or needed works including new pipes and valves, permanent and portable flow and pressure equipment installation works. SECOND PHASE (LEAKAGE DETECTION AND WATER QUALITY): i. Night pressure test to verify the water tightness of the delineated zone boundaries, ii. Sub-zone minimum night flow measurement and leakage flow rate estimation, iii. Active leakage control activities in the sub-zones with the higher leakage rate (using sounding and acoustic correlation components), iv. Water quality field survey to verify the effectiveness of the relative proposed works.
EYDAP implemented a leakage level assessment and detection project for the water distribution network of Athens (with population of over 3,800,000 inhabitants). The overall project consisted of 12 parallel pilot projects in selected parts of the water supply distribution network of Athens. This pilot project for leakage control on the water supply system of Athens covered the areas of Glyfada, Argyroypoli, Elliniko, Voyla and Vari covering about 225 km of pipes. Total project was separated in two phases: map updating and assessment, and leakage detection

Final design of flood protection works of the new railway line from giannoula stream to thriassio pedio area (4.5 km), south attiki perfecture

Country: Greece
Client: -
Year: 1995 - 2000
Funding: -
Contract Value: -
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Final design of flood protection works of the new railway line from giannoula stream to thriassio pedio area (4.5 km), south attiki perfecture

Country: Greece
Client: -
Year: 1995 - 2000
Funding: -
Contract Value: -

This study concerned the detail design for flooding protection of the new railway from the “Mauri Hora” tunnel exit to Giannoula stream and the entrance at Thriassio Pedio Station (4.5 km long). Additionally to the above, ten new culverts were studied in order to protect the railway line from flooding from the upstream catchment areas. The following culverts were studied: Box-shaped Drain 5,00 x 4,00 m STA. 22+403,41, Circular Drain D = 1,20 m STA. 22+554,97, Circular Drain D = 1,20 m STA. 22+743,43, Circular Drain D = 1,20 m STA. 22+808,38, Circular Drain D = 1,20 m STA. 22+941,85, Box-shaped Drain 3,00 x 3,00 m STA. 23+083,84, Circular Drain D = 1,20 m STA. 23+220,14, Box-shaped Drain 3,00 x 2,00 m STA. 24+366,09, Box-shaped Drain 3,00 x 3,00 m STA. 24+507,57, Circular Drain D = 1,20 m STA. 24+749,19. The above ten culverts have been already constructed.
This study concerned the detail design for flooding protection of the new railway from the “Mauri Hora” tunnel exit to Giannoula stream and the entrance at Thriassio Pedio Station (4.5 km long). Additionally to the above, ten new culverts were studied in order to protect the railway line from flooding from the upstream catchment areas. The above ten culverts have been already constructed.

Preliminary study of basic sewerage works in messiniakos gulf, messinia prefecture, south greece

Country: Greece
Client: -
Year: 1996 - 2001
Funding: -
Contract Value: -
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Preliminary study of basic sewerage works in messiniakos gulf, messinia prefecture, south greece

Country: Greece
Client: -
Year: 1996 - 2001
Funding: -
Contract Value: -

The study dealt with the main pipes for the wastewater transport system covering the whole of Messiniakos Gulf from Koroni to Kitries villages. Two treatment plants were proposed, the rehabilitation of the existing in Kalamata, and a new-one in Koroni village. The study was extended to cover all villages at the interior of Messiniakos Gulf that would be served by the two treatment plants. A number of alternative solutions examined in order to propose the most technicallly and financially appropriate. The alternative design studied different locations for the WWTP installation and a number of pumping stations.
The study dealt with the main pipes for the wastewater transport system covering the whole of Messiniakos Gulf from Koroni to Kitries villages. Two treatment plants were proposed, the rehabilitation of the existing in Kalamata, and a new-one in Koroni village. The study was extended to cover all villages at the interior of Messiniakos Gulf that would be served by the two treatment plants. Different locations for the WWTP installation and a number of pumping stations were examined.

Detailed design of irrigation networks in zones d0 and d1 of polyfyto area in kozani prefecture, macedonia district, north greece

Country: Greece
Client: -
Year: 1996 - 1998
Funding: -
Contract Value: -
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Detailed design of irrigation networks in zones d0 and d1 of polyfyto area in kozani prefecture, macedonia district, north greece

Country: Greece
Client: -
Year: 1996 - 1998
Funding: -
Contract Value: -

This study was about the rehabilitation of the existing irrigation network system of Polyfytos Dam ,about 2,5 thousands hectares, in the north area of the dam’s lake, the reformation of the irrigation networks, the installation of a pumping station by the lake, transferring the water to a tank nearby and a second station, pumping the water to the main irrigation tank with a volume of about 40,000 m³. Especially for the pumping station abstracting the water from the lake, a number of alternatives were examined at a feasibility phase and included a floatable P/S, a permanent one inside the lake and a permanent one by the lake shore. The later was the proposed and accepted by the Client.
This study was about the rehabilitation of the existing irrigation network system of Polyfytos Dam ,about 2,5 thousands hectares, in the north area of the dam’s lake, the reformation of the irrigation networks, the installation of a pumping station by the lake, transferring the water to a tank nearby and a second station, pumping the water to the main irrigation tank with a volume of about 40,000 m³.

Remote management of the water supply network, the sewerage pumping stations and the wastewater treatment plant of kalamata, south greece

Country: Greece
Client: -
Year: 1995 - 1997
Funding: -
Contract Value: -
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Remote management of the water supply network, the sewerage pumping stations and the wastewater treatment plant of kalamata, south greece

Country: Greece
Client: -
Year: 1995 - 1997
Funding: -
Contract Value: -

The study deals with the development of a complete remote measuring system of the external water supply network of Kalamata area and the detail description of the remote management automation system and remote control of networks, water reservoirs and pumping stations of the join water network of Messina, the surrounding communities and the city of Kalamata. It proposed the installation of flow and pressure measuring stations at all junctions and with wireless system data transmission to the control center of the wastewater treatment plant. It also involved proposals for the system’s extension of the distribution network with the installation of a fixed leakage control system It also included the study of the Sanitation Network that consisted of the detail description of the remote management automation system for the sewerage network, the pumping stations, the main collector pipe and the Waste Water Treatment Plant. In the sewerage network, three (3) local control stations, TSEA type, were installed for the monitoring of the daily consumption of pumping stations A5, A6 and A10. With the whole remote system installed, the sanitation network was satisfactorily observed.
The study deals with the development of a complete remote measuring system of the external water supply network of Kalamata area and the detail description of the remote management automation system of networks, water reservoirs and pumping stations in and out of the vicinity of Kalamata city. It also included the study of the remote management automation system for the sewerage network, the pumping stations, the main collector pipe and the Waste Water Treatment Plant.

Modifications – completions of sewerage and storm networks within the kifissos river drainage basin

Country: Greece
Client: -
Year: 1995 - 2003
Funding: -
Contract Value: -
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Modifications – completions of sewerage and storm networks within the kifissos river drainage basin

Country: Greece
Client: -
Year: 1995 - 2003
Funding: -
Contract Value: -

The project involved the detailed design studies for the upgrading and rehabilitation of sewerage and storm networks within the Kifissos River Drainage Basin covering a large part of the city of Athens that corresponds to about 2.54 million inhabitants. The following studies are some of the ones completed through the contract: a. Culvert design in Filikis Eterias Stream, b. Sanitary and storm sewerage network design in Filadelphia Municipality, c.Storm sewerage network design in Probona Area, d.Sanitary and storm sewerage network design in Akadimia Platonos area in Athens, e.Storm and sanitary sewerage networks in Zefyri Municipality, f.Sanitary and storm sewerage network in Thrakomakedones Municipality, g.Underwater pipe transferring sewage from Salamina Island to WWTP in Psitalia, h.Main sewer in Markoni, Athens, i.Expanding of the Athens sanitary sewerage system main collector pipe
The project involved the detailed design studies for upgrading and rehabilitating of sewerage and storm networks within the Kifissos River Drainage Basin covering a large part of the city of Athens that corresponds to about 2.54 million inhabitants.

Detailed engineering design and tender documents for the construction of setta – manikia dam, evoia island, central greece

Country: Greece
Client: -
Year: 1994 - 1997
Funding: -
Contract Value: -
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Detailed engineering design and tender documents for the construction of setta – manikia dam, evoia island, central greece

Country: Greece
Client: -
Year: 1994 - 1997
Funding: -
Contract Value: -

The objective of the study was the detailed design for the construction of the water supply and irrigation dam “Manikia” in Evia Perfecture, central Greece. Manikia dam was designed as an earthfill dam with a clay core and its basic technical characteristics are: – River Basin upstream of the dam: 13.60 km². – Elevation at the dam’s axis: +729 m in the river valley, +774 m at dam’s crest, +770 at dam’s f.s.l. – Total capacity of the dam: 2,602,000 m³, usefull capacity of the dam: 2,399,500 m³. – Dam’s height (at the axis): 54 m. – Irrigation area (downstream): 800 ha, water supply demand 3.43 hm³/year for Kymi and Aliveri cities. Construction of dam was ended at 2003. Now it is in full operational mode.
The objective of the study was the detailed design for the construction of the water supply and irrigation dam “Manikia” in Evia Perfecture, central Greece. It was designed as an earthfill dam with a clay core. The river basin upstream of the dam is 13.60 km². The total capacity of the dam is 2,602,000 m³. The dam’s height is 54 m, the irrigation area served 800 ha while the water supply demand 3.43 hm³/year for Kymi and Aliveri cities. From 2003 was set in full operational mode.

Feasibility study for irrigation network rehabilitation and flood protection of low relief valeys in aitoloakarnania prefecture, west greece

Country: Greece
Client: -
Year: 1993 - 1995
Funding: -
Contract Value: -
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Feasibility study for irrigation network rehabilitation and flood protection of low relief valeys in aitoloakarnania prefecture, west greece

Country: Greece
Client: -
Year: 1993 - 1995
Funding: -
Contract Value: -

The project examined all the irrigation areas of Etoloakarnania Prefecture (areas of Messolonghi, Trichonida, Naupaktia, Valtou, Ksiromerou) and produced the following deliverables: – Feasibility design study for the rehabilitation of the existing irrigation networks. The existing total irrigated area covered approximately 7,000 ha and – Feasibility design study for the flood protection of low relief valeys of Etoloakarnania Prefecture.
The scope of the project was the Feasibility Design study for rehabilitating the existing irrigation networks of all the irrigation areas of Etoloakarnania Prefecture (areas of Messolonghi, Trichonida, Naupaktia, Valtou, Ksiromerou) and the flood protection of low relief valeys of Etoloakarnania Prefecture.

Detailed engineering design and tender documents for the construction of vrachos dam, kastoria prefecture, north greece

Country: Greece
Client: -
Year: 1992 - 1994
Funding: -
Contract Value: -
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Detailed engineering design and tender documents for the construction of vrachos dam, kastoria prefecture, north greece

Country: Greece
Client: -
Year: 1992 - 1994
Funding: -
Contract Value: -

The scope of the contract was the detailed design for the construction of the irrigation dam “Vrachos” in Kastoria Perfecture, northwest Greece. Vrachos dam was designed as an earthfill dam with a clay core and its basic technical characteristics are: – River Basin upstream of the dam: 9.20 km². – Elevation at the dam’s axis: +920 m in the river valley, +959 m at dam’s crest, +955 at dam’s a.s.l. – Total capacity of the dam: 1,948,500 m³, usefull capacity of the dam: 1,733,000 m³. – Dam’s height (at the axis): 48 m. – Dam’s crest width 7.0 m, crest length 250.0 m. – Irrigation area (downstream): 465 ha. Construction of dam was delayed due to expropriation issues and was ended in 2007. Now it is in full operational mode.
The scope of the contract was the detailed design for the construction of the irrigation dam “Vrachos” in northwest Greece. It was designed as an earthfill dam with a clay core. The river basin upstream of the dam is 9.20 km². The total and useful capacity of the dam is 1,948,500 m³ and 1,733,000 m³ respectively. The dam’s height is 48 m and the irrigation area served is 465 ha.Construction of dam was ended in 2007. Now it is in full operational mode.