Main & On-farm Irrigation and Drainage Network Project of the SHAMAT-MOGHAN

Narrative Description of Project

The project location is situated in Moghan plain, in north of Ardabil province, in about 220 km north of the province center and west of Parsabad town in boundary of Iran-Azarbayejan countries. Ardabil-Parsabad-Bilesavar road is located in north of project.
The project covers 2500 ha of the agricultural lands in the terraces of the Aras River in the Moghan Plain. Traditional channels irrigate the main part of the lands of the study area. More than 50% of the lands in this area are waterlogged and yield low-quality products. The study of the Shamat-e Moghan main and subsidiary irrigation and drainage networks project is aimed at the direct intake of water from the Aras River, and at the investigation of the causes that have made the lands waterlogged, at the introduction of suitable guidelines to eliminate the potentialities that have led to this state of the lands, and also introduction of suitable designs to drain the water of the lands away to the Aras River, to improve the lands, to design the modern main and subsidiary irrigation and drainage network and to improve the traditional channels.

Specification of Streams in Current Status

Resources

Flow (L/s)

Coverage under Streams (Ha)

Name of streams

Aras River

1930

1033

Naji

F,H,I Canal

160

960

Torab

Aras River (Wetland)

150-220

110

Pirayuvalto

I.K Drainage

280

183

Mohammad reza Loo

L.K Drainage

150-210

109

Bala Beigloo

A Drainage

140

30

Doostloo Candy Channel

Wetland

280

19

6 nafari channel

 

Description of actual services provided by your staff within the assignmentDescription of actual services provided by your staff within the assignment

1- Surveying:

Generally, surveying the area includes the preparation of topographic and cadastre maps on the scale of 1:2000 (fig. 1), in order to design modern main and subsidiary network and to recognize the ownership of the lands in over 2500 ha. Moreover, transverse sections of the main channels of the project were prepared in order to improve traditional channels, to use the channel routes optimally, to decrease land acquisition of the destroyed channels (Fig. 2), and to compute the conveyance capacity of each channel (Figs. 3 and 4). Also a sample of permanent Bench Mark table shows in Fig.5.

 

2- The investigation of the irrigation and drainage status quo:

In these investigations, the traditional channels will be traversed  along their routes in order to obtain general information on the channels, and to indicate the waterlogged lands.

3- Social Studies:

In order to get farmers' contributions to construct irrigation networks and to organize water users to use subsidiary networks, social studies, farmers' associations studies, and Shamat-e Moghan drainage and irrigation operation and maintenance were undertaken.

4- Geotechnical and Borrow Material Investigations:

These investigations were undertaken in order to estimate the bearing capacity of the soil types along the traditional channel routes, and to determine the stable slopes of excavations and embankments and to recognize borrow areas. After performing these investigations, recommendations to improve the foundation material under the canals, and the under the piers of the semi-elliptical canal, and treatments to improve the fine-grained borrow were given.

5- Agricultural Investigations:

These investigations were undertaken to determine the crop pattern status quo, and crop pattern under the project conditions, and to compute water demand.

6- Design of the main and subsidiary networks:

6-1- Installations for intake from the river:

These installations include the earthen conveyance canal, intake gates, and desiltation lagoon and a retaining wall measuring 6 m in height in order to protect the intake structure against the flooding in the Aras River.

6-2- Irrigation and drainage network:

The irrigation and drainage network consists of a 2-km long flume at an elevation range of 4-6 m, a 5.5-km long flume at and elevation of 2 m, a 7.7-km long trapozoial canal, a 12-km long semi-elliptical prefabricated canal of the types 315, 450, 600 and 800, and earthendrainage of 44 km.(Fig. 6 to fig. 8)

6-3- Subsidiary irrigation and drainage network:

Construction of 42-km long semi-elliptical canal of the types 600, 450, 315, 230 and 150, and construction of 42-km long small earthen drainage.

6-4- Underground drainage:

With regard to the swampy lands over an area of 1450 ha, the underground drainage will consist of 279 underground lateral drain made of u-pvc, perforated tremie measuring 98390 m  in length and 100 mm in diameter, and 44 collector drains (made of u-pvc and polyethylene) measuring 30838 m in length.

6-5- Structures:

Many structures consisting of intakes, checks, culverts, bridges, etc. have been designed.