Chu river Weir Project

Project location: Chu river, Thanh Hoa province
Construction time: Construction: 1918-1926; Repair, upgrading: 1990-1996
Preparation of FS report
Project tasks: Irrigating 50 000 ha in the South of Ma river;

Generating: Ban Thach hydropower station on main canal, installed capacity N=960 KW;

Waterway navigation.

Major technical parameters:
- Work grade: II (according to the standard TCXDVN 285:2002)
- Dam crest length: 170.0 m
- Dam height: 19.0 m
- Irrigation discharge: 40.0 m³/s

Scale and structure of project works:

Headworks consist of:

- Spillway: constructed of concrete (length of the part crossing rock area: 40m). Initial shape of the spillway was trapezoidal, then it was added concrete “teeth” to create surface flow.

- Intake: 7 arch gates, dimension: 2.9 x 2 m.

- Sand sluice: 3 arch gates, dimension: 2 x 3.4 m.

- Lock b = 4 m

At present, the spillway is expended and raised to become the Ophiserov one with energy dissipator apron. Sand sluice is newly constructed with ventilating pipe. Old intake and lock are demolished and replaced with the new ones with treated foundation.

Canal system:

- Main canal: 17km long, North canal: 54km long, South canal: 37km long, 61 secondary canals: 230 km long and thousands of related structures including cross regulator, turnout, culvert, side spillway, siphon, aqueduct, canal crossing bridge, etc.

- Chu river Irrigation Project was constructed by the French. Due to strong impacts of wars and nature, the project has been seriously degraded. Feasibility Study for restoration, upgrading of the project has been approved by the State with ADB loan. Design of the headworks has been done through international bidding. Consontim EXPERCO/KCC/Ect (Canada, USA) is the contract winner, HEC is its partner. Canals and related structures are carried out by HEC.