Project  Name : Mae Taeng-Mae Ngat-Mae Kuang Diversion Tunnel Project

Name of Company : Panya Consultants Co., Ltd.

Name of Associated Firm :

1.P&C Management Co., Ltd

2.Asdecon Corporation Co., Ltd.

3.Frontier Engineering Consultants Co., Ltd.

4.Index International Group Co., Ltd.

Location : Chiang Mai Province, Thailand

Client : The Royal Irrigation Department

Project Cost : 3,600  million baht

Type of Service : The scope of work is divided into two stages:

1.Study stage consists of two phases:

Phase 1 Study of project development options and initial environmental examination (IEE)

Phase 2 Feasibility study and environmental impact assessment (EIA)

2.Detailed design stage

Project Description : 1.The study of project development options showed that the Mae Taeng-Mae Ngat-Mae Kuang is an appropriate option comprising development of Mae Ngat-Mae Kuang and Mae Taeng-Mae Ngat diversion routes and Mae Faek-Mae Taeng pumping project.

2.The most appropriate diversion routes comprising Mae Taman Regulator, Mae Taeng-Mae Ngat and Mae Ngat- Mae Kuang diversion tunnels are selected to be studied.

3.Detailed design

3.1Mae Ngat-Mae Kuang Diversion Tunnel

(1) Diversion tunnel, 4.2 m in diameter and 22.975 km in length

(2) Intake structure : Gated Tower

- Guard gate : bulkhead gate, 4.2 m wide and 4.2 m high

- Operating gate :  fix wheel gate, 4.2 m wide and 4.2 m high

(3) Outlet structure : Gated Tower

- Guard gate : bulkhead gate, 4.2 m wide and 4.2 m high

- Operating gate : fix wheel gate, 4.2 m wide and 4.2 m high

- Energy dissipater (stilling basin type III), 7 m wide and 10 m long

3.2Mae Taeng-Mae Ngat Diversion Route comprises:

(1) Mae Taman Diversion Dam and appurtenant structures

- Three flap regulating gates (12.50 x 3.50 m) and 10 fine sand sluice gates (0.80 x 1.00 m)

-  Two coarse sand sluice gates (2.50 x 3.50 m) and a sand sluice tunnel with a diameter of 6 m and 160 m length

- Tunnel inlet structure (4.00 x 4.00 m)

(2) Diversion tunnels and appurtenant structures

- Mae Taeng-Mae Ngat Diversion Tunnel with a diameter of 4 m and 25.401 km length

- Sand trap tunnel, 14 m wide, 8 m high and 100 m long

- Siphon tunnel with a diameter of 3.85 m and 1,350 m length-  Tunnel outlet structure (energy dissipater type I), 8 m wide and 12 m long