Long Song Reservoir

Project location: Long Song river, Binh Thuan province

Construction time: Commencement in 2001

Project managers: Le Van Ngo - Do Van Xung - Phan Van Luong

Project tasks: Irrigating 4260 ha

Major technical parameters:

Basin area: 394 km²

Work grade: III

Surcharge water level: + 77.63 m

Normal water level: +76.95 m

Dead water level: +54.00 m

Total storage capacity: 36.88 million m³

Effective storage capacity: 32.28 million m³

Dead storage capacity: 3.6 million m³

Scale and structure of major works:

- Gravity concrete dam

+ Dam crest elevation: +79.50, length: 246m, Hmax: 44.80m

- Spillway: Ophiserov, gated, bucket type energy dissipator. Spillway dimension n(BxH) = 6x(8x6)m, Q_{relief p=1%:} 1795.3 m³/s. Spillway sill elevation: +70.95.

- Non-pressure intake, dimension: 1.50 x 2.20m, Q_design = 4.20 m³/s

- Water convey system

+ R.C turnout

+ Channel: Long Song river of 4.4 km long, design discharge (Q_design) = 2.68 m³/s

+ Tuy Tinh dam: constructed of rock masonry and rock gabion

+ Cay Ca canal constructed of R.C, 2 km long, design discharge (Q_design) = 1.52 m³/s

- Irrigation canal system

+ Cay Ca main canal (right bank), 11.97 km long, Q=1.5 m³/s and 14 primary canals, 27.85 km long

+ Tuy Tinh main canal (left bank), 9.12 km long, design discharge Q=2.35 m³/s and 10 primary canals, 15.96 km long.