2009-2011 Construction of 4 Irrigation Gravity Systems in Aygezard, Shenik, Mantash and Vardenis

Ajgezard

The Project stipulates for replacement of power-operated irrigation schemes with a gravity irrigation system for irrigation of 702 ha territory, 306 ha of which are to be used in future.

Description of structures:
The project planned for the following principal structures:
– Construction of L=8424 m long Aygezard Main Canal and of 97 structures on it.
– Laying of L=364 m long pipeline of D=274´4 mm pipes for feeding Nor Ughi No.1 water-pump station.
– The feeding of pressure pipeline of Nor Ughi No.2 water-pump station will be made by the discharge gauging station at DM 79+68 of Aygezard Canal.
The works comprise of laying of pipelines and installation of reinforced concrete flumes on the stretch of 8.805 km, construction of cast-in-place concrete and cast-in-place reinforced concrete chambers, mounting of equipment.

Short outline of the Project structures:

1. Conduits of steel pipes with diameters D=273 mm, 720 mm, 820 mm and 1020 mm

4.008 km

2. Conduits of precast LR-8 reinforced concrete flumes at the stretch

4.446 km

3. Concrete, RC structures, outlets and water gauging units, distribution and overflow chambers

270 m

4. Earthworks

61170 m3

5. Shotcreting

890 m3

6. Installation of reinforced concrete construction of LR-8 type

570 m3

7. Reinforced concrete wells

22 m3

8. Reinforced construction

2050 t

9. Metal construction

7100 kg

     10. Still fittings

3430 kg

     11. Waterproofing and painting of pipelines

 3870 m2

Mantash

The implementation of the Project  permit a regular supply of water to lands under command of the Mantash irrigation system, and in case of construction of Panic-Meghrashen gravity irrigation canal it will be possible to irrigate 320 ha area, including 75 ha in the Panic Community and 245 ha in Meghrashen, to decommission the Artik PS and save 484.49 thous. kW of electricity.

The planned arrangements and outline of the works:
The project included:
–  rehabilitation of the right bank and left bank canals
–  design of new Panic-Meghrashen gravity irrigation canal.

The following construction activities were  implemented:
– cleaning the canals of sediments and vegetation;
– removal of deteriorated concrete of bottom and sides;
– filling of cavities in the sides and bottom with B7.5 class concrete;
– placing of 10 cm thick layer of B12.5 class concrete over the existing concrete of bottom;
– placing of 10 cm thick layer of B12.5 class concrete over the existing concrete of the sides of the canal at stretches with trapezoidal section;
– placing of 10 cm thick layer of B12.5 class concrete over the vertical sides of canal

– repair of water outlets by mounting new gates;
– The lining plates at different stretches of the canals were dismantled and placed again.

Shenik

The project of Shenik irrigation system includes provides for the following works:
– reconstruction of L=7441 m long stretch of the discharge canal of Hoktemberyan No.2 Water-pump Station, including:
– installation of prefabricated L-10-30-2 structures L=4074 m
– installation of precast LR-8 reinforced concrete model flumes L=1368 m
– installation of precast LR-6 reinforced concrete model flumes L=1494 m
– structures – 505 m

Vardenis

The main objective of the project is a guaranteed supply of irrigation water to all water consumers.

The Vardenis irrigation scheme is constructed with a view to rehabilitation of Masric canal.
For rehabilitation of canal the following activities were implemented:
– Clean the canal of the sediments, bushes and grass.
– Dimentle  of the exposed concrete surfaces of the slopes and bottom of the canal.
– Fill in the cavities formed in the slopes and bottom of canal with a B 7.5 mark concrete.
– Place a 10 cm thick layer of B 12.5 mark concrete over the existing concrete of canal bottom.
– Place a 10 cm thick lining of B 12.5 mark concrete over the existing concrete of the slopes of canal stretches with trapezoidal section.
– Place a 10 cm thick lining of B 12.5 mark concrete over the existing concrete of canal slopes at stretches with rectangular section.
– Repair plain leafs of gates at  rehabilitate of all water outlets through mounting new gates.
– Construct new concrete walls on the right side of canal stretches if lacking.
– Clean the inner side of pipes under the existing bridges of the sediments.
– Building of a fence.
– The lining plates at different stretches of the canals were dismantled and pleaced again.