Lower Ayun Reservoir

Project location: Headworks group is located on Ayun river in Ho Bong commune, Chu Se district, Gia Lai province (2000).

Consultancy contents:

- Geological investigation

- Topographic survey

- Preparation of feasibility study report

- Preparation of technical design + Total cost estimation

- Preparation of detailed design + Cost estimation

Project Managers: Tran Dang Am, Le Dinh Tuyet

Project tasks:

Supplying gravity irrigation water for 13 500 ha of cultivated land in Ayun district; Providing water for sugar cane factory with capacity of 2 800 T/day; Aquaculture, power generation for irrigation pumping stations in the area (capacity of 2,700 KW).

Major technical parameters:

- Work grade: II (TCXDVN 285:2002)

- Basin area: 1670 km²

- Total storage capacity: 253 x 10⁶ m³

- Effective storage capacity: 201 x 10⁶ m³

- Dead storage capacity: 52 x 10⁶m³

- Dam crest length: 370.0 m

- Maximum dam height: 36.0 m

- B_spillway: 18 m

- Q_spillway: 1 237.0 m³/s

- Earth excavation, earthfill: 4 488,940 m³

- Rock excavation: 285.43m³

- Concrete of various types: 55.387 m³

- Masonry works: 37.61 m³

Scale of project works:

- Earth dam: Inhomogeneous dam

- Spillway: Reinforced concrete, 3 segment gates, BxH = 6x5, electrically operated, bucket type energy dissipator.

- Intake: Reinforced concrete, located in right abutment of main dam, design discharge of 13.4 m³/s, power generation.

- Canal system: consisting of main canal, North canal, South canal and 40 canals (including primary and smaller ones).