Chaloos Water Conveyance System

Narrative Description of Project

The Chaloos River is one of the Importatnt Rivers of the Mazandaran Province, which is fed by meltwater and has a considerable steady state permanent flow. The mean annular flow of this river is 486 million cubic meters, most of which is left unused and is emptied into the Caspian Sea during the spring and summer seasons. The study of the project, which has already started, is aimed at the optimal consumption of the water of the Chaloos River for the development of the plains east of Mazandaran, and also for meeting the drinking and agricultural water needs, especially supplying drinking water to the cities of Nowshahr and Chaloos. Untill now, some of the components of the project, such as the diversion dam, conveyance tunnel, and the first part of the conveyance canal have been constructed and are currently in operation.

Project Scheme

On the basis of the project plan, the Chaloos water conveyance canal starts from the Chaloos Diversion Dam and extends eastwards up to the Haraz Plain for a length of 109 km. The capacity of the canal is 21 cubic meters per second initially. The canal also receives the surplus water of the Kheirood, Kojoorrood, and Galandrood rivers, which have the mean annual flows of 90, 130, and 100 million cubic meters; respectively, and continues towards the Haraz Plain after meeting all the agricultural needs of the Caspian Sea coastal plain from Chaloos to Aalesh Rood, and of the cities of Nowshahr and Chaloos and other cities situated in its course.

Project objectives

A- Supplying 53 million cubic meters of drinking water to the cities of Chaloos, Nowshahr, and other cities and settlements situated along the Canal from Chaloos to Aleshrood rivers, and using the water of the permanent springs, alreFady used for irrigation, as the drinking water to be supplied to the mentioned cities and settlements, and replacing the water needed for irrigation with the water from the canal. B- Supplying 14 million cubic meters of water needed for development and for making up for the shortage of water needs of 2200 hectares of rice fields in the coastal plain. C- Supplying 10 million cubic meters of water needed for the supplementary irrigation of 2830 hectares of gardens and citrus fruits orchards in the coastal plains. D- Improving the water intake system for 25200 hectares of agricultural lands in the coastal plain. E- Conveying 480 million cubic meters of surplus water from within the project area to the Haraz Plain. About 243 million cubic meters of this amount of water (from the month of Farvardin through the month of Mordad) (natural regulated water), and 185 million cubic meters of water (from the month of Shahrivar through the month of Esfand) (unsteady state flow) will be used, with the regulated water from the Haraz River to irrigate 25984 hectares of rice fields, and to charge about 3500 hectares of Ab-bandans (local water pools) in order to irrigate about 6000 hectares of rice fields, and to supply the drinking water from the Lar Dam built on the Haraz River to Tehran. F- Supplying 214 million cubic meters of water (88 million cubic meters for the four rivers of Chaloos, Kheirood, Kojoorrood, and Galandrood; and 20 million cubic meters for other rivers) to meet the environmental needs of the rivers along the canal. In order to convey the surplus water of the Chaloos, Kheirood, Kojoorrood, and Galandrood rivers to the Haraz Plain, the Chaloos Water Conveyance Line measuring 109 Km in length, with a capacity ranging from 21 to 24 cubic meters per second, and all the technical components such as intakes, siphons, culverts, side spillways, waste ways, overpasses and pedestrian brides, and protective structures (retaining walls) will be constructed, and slope protection measures will be taken.

The main installations of the project as follows

A- The Chaloos Diversion Dam: This type of dam is made of concrete free spillway, measures 55 m in length, and 8 m in height from the foundation, and includes the appurtenant structures such as sluiceway, intake, link canal, fish ladder, and pedestrian bridge over the spillways, which are in operation. B- Conveyance Tunnel: This structure is 2+036 km long free flow tunnel, has a horseshoe section with a diameter of 3.20 m, conveys water to the beginning of the Chaloos River, and is in operation. C- The Chaloos Conveyance System: this canal is 109 km long and consists of six parts with the characteristics as mentioned in the following table:

Description of actual services provided by your staff within the assignment

- Project management and construction supervision of the described project. - To be composed of highly qualified and full experienced experts, who can carry out all the routine construction supervision duties as a fully independent and competent. - To prepare suitable mechanism which will ensure thorough coordination of the teams? - To supervise construction of the work and to test or order to test and examine any materials to be used or workmanship employed in connection with the works. - To supervise the works and to approve the materials and workmanship of the works in cooperation and consultation with the Employer, as spelled out in the contract documents for the works. - To ensure that the Detailed Design and Construction work is accomplished in accordance with the technical specifications and other Contract Documents. - Landscape designs were also reviewed and finalized, besides supervision of the applications. - To identify construction problems and delays and recommend to the consultant actions to expedite progress if the Works fall behind schedule. - To monitor and check the day-to-day quality control and quantity measurements of the works carried out under the Contract. - To supervise the Contractor in all matters concerning safety and care of the works. - To prepare detailed recommendations for contract change orders and addenda, as necessary, to ensure the best possible technical results are achieved with the available funds. - To direct the Contractor to carry out all such works or to do such things as may be necessary in his opinion to avoid or to reduce the risk of any emergency affecting the safety of life or of the works or of adjoining property and to advise the Engineer thereof as soon thereafter as is reasonably practicable. - To verify, and if necessary order correction of, the Layout per the detailed design by the Contractor. - Prepare and submit to the employer required copies of each of the reports including Monthly reports, Quarterly and Periodic Reports, Technical Reports, Final Completion Reports and etc. - Certify and check the As Built Drawings of the contractor and submit it to the Employer. - Inspection of quality control and successful implementation of Quality Assurance Plan for the entire project and submit comprehensive documents on Quality Assurance, covering relevant engineering services and control works. - To have the effective relations with the client during the construction of the project. - To supply mobilization, office establishments, transportation, accommodation, financial and administrative support, regulatory and taxation.