HEC

Project location: Tich Giang river - Hanoi
Construction time:1958 - 1964
Project manager: Pham Khac Minh Hung (Mrs), Nguyen Hoang (Mr)
Project duties:- Irrigating 7500 ha of Quang Oai, Bat Bat, Tung Thien districts
- Controlling flood

Major technical parameters:
Work grade: III
Catchment area: 60 km²
Surcharge water level (SWL): +26,20
Normal water level (NWL): +24,80
Dead water level (DWL): +12,00
Storage capacity at NWL: 46.5 million m³
Storage capacity at DWL: 4.2 million m³
Scale and structure of project works:
Main works:
- Earth dam: 01 main dam, 02 auxiliary dams
Main dam: L = 400m, Hmax = 24.0m
Auxiliary dam A: L = 3.4 km, H_average: 3 - 10m
Auxiliary dam B: L = 0.8 km, H_average: 2 - 7 m
- Spillway:
Wide crest, bottom elevation: +14,0, top elevation: +24,8, 03 gates, B = 35m (02 piers), Qrelief: 80 m³/s
- Irrigation culvert: underground culvert, (bxh) = (1.8x2)m, L = 91 m, H = 17m, Q_design = 5.07 m³/s
Suoi Hai reservoir is one of two first large reservoirs in the North of Vietnam designed by Design Investigation Department (precursor of HEC). On 15/04/1964, Uncle Ho visited Suoi Hai reservoir and compared it to Genever reservoir in Switzeland.