Studies for the Mazandaran to Golestan Water Transmission System

Narrative Description of Project

In recent years, a number of studies on the northern provinces of Iran had shown potential land reclamation opportunities in the area. These Northern provinces resemble an oblong area in shape, formed between the Caspian Lake - world's largest lake - lying north of Iranian territory and the Alborz Mountains ranging west to east within Iran just below the Caspian Lake. This belt-shaped area includes three provinces of Iran: Gilan in the west, Mazandaran at the middle, and Golestan in the east. These northern slopes of Alborz Mountains are covered with dense forests on steep foothills in the west to milder slopes covered with prairies and some semi-arid lands in the east. While there is an abundance of water in narrower western banks of the great Caspian Lake, an abundance of fertile lands exists at the wider eastern banks with less water resources. A prefeasibility study revealed that leaving out justifiable flow for preserving local environment and reasonable amounts for local municipal, agriculture and industrial activities, there will remain plentiful resources of water for inter-sub-basin transmission. Downstream lands of Chalous, Haraz, Babolroud, Talar, and Tajan Rivers lying in western and central areas of the Mazandaran Province appeared to hold appropriate sources for water transmission. The water transmission destination in the prefeasibility studies - carried out also by MGCE - was set to be the eastern province of Golestan.

Description of actual services provided by your staff within the assignment

Basic studies The whole area of the project was divided into five main irrigation zones. Three zones with abundance of water had already well-established irrigation and drainage networks. Those include Haraz (100000 hectares), Talar (60000 hectares), and Tajan (64000 hectares). Two other eastern zones of Neka and Gorgan had water shortages. Those two zones constitute a gross area of 975000 hectares including fertile lands along with municipal and rural water shortages. In this feasibility study, supplementary basic data of meteorological, hydrological, and groundwater conditions within the project area have been acquired. Water needed for preserving local ecosystems and water demands for local municipal, agricultural and industrial activities in each of the five main irrigation zones where reviewed deliberately.
Devising an appropriate water transmission system Based on basic studies and analyses results, water resources planning were carried out on a yearly total of 650 million cubic meters of water resources. The water resources planning consider thoroughly validated abundant water potential, possible water resource scenarios, required water intakes, and water transmission rates. A number of alternative solutions were proposed for the water transmission system. Those systems include open channels through flat terrains, flumes constructed in partially excavated sections or above ground, pipe lines and tunnels drilled through mountainous obstructions.

In this project, conveyance system for agricultural water supply studied in 2 scenarios as below: 1. Upstream conveyance system
· Length of the routes: 118 km
· Concrete canal and elevated Flume:70 km
· Tunnel: 30 km
· Pipeline:18 km
· Transferable water volumes: 359 MCM
· Conveyance system capacity: 10-15 M3/s
2. Downstream conveyance system
· Length of the routes:105 km
· concrete canal and elevated Flume: 27 km
· Pipeline:78 km & 2 pumping stations
· Transferable water volume: 428 MCM
· Conveyance system capacity: 10-15 M3/s
Also, conveyance system for local municipal water supply (Behshahr-Gorgan regions) studied in a scenario as below:
· Length of the routes: 81 Km
· Tunnel: 7.6 km
· Pipeline:73.4 km
· Transferable water volume: 80 MCM
· Pipeline diameter: 1400-1600 mm
Final solution was advised based on water resources planning in destination zones and considering social, economic and environmental studies delivered by MGCE experts.

Deliverables of the project

· Meteorological report
· Hydrological report
· Groundwater conditions report
· Water resources planning and management report
· Irrigation and drainage studies report and synthesized construction drawings
· Land potential report and synthesized drawings
· Agricultural, livestock, and agro-economics report for destination zones
· Social studies report
· Geological, geotechnical and construction material borrows report
· Environmental impact studies report
· Economical evaluations report
· Final Project Schema report