Dredging Programme
Cho Lach: Dredging and the A3 Bridge Construction Interface
Photo credit: Historical Cho Lach canal view: 2010 according to source metadata; current file uploaded 11 April 2014. The pictured bridge is unidentified.
Bùi Thụy Đào Nguyên (Thuydaonguyen) / Wikimedia Commons; author's public-domain dedication with fallback grant. Cho Lach canal, historical 2010 context per source metadata. Resized. Current file uploaded 11 April 2014; bridge identity unverified. Bùi Thụy Đào Nguyên (Thuydaonguyen) / Original source. File-specific author declaration: Author's public-domain dedication and fallback grant.
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Vietnam's A1 invitation combines improvements to Cho Lach, Rach Ky Hon and Rach La canals in a 24-month works contract. The signed 28 September 2026 notice specifies dredging, embankments, drainage and local roads, with rated technical and non-price factors weighted at 50% and the financial bid at 50% [1]. The 13 August procurement table places Cho Lach 2 Bridge and its access roads in a separate A3 package [2]. The canal programme therefore interfaces with the separately planned A3 bridge and access-road works.
A1 combines waterway and shoreline construction
The October Vinh Long plan describes approximately 899,245 m³ of Cho Lach dredging, 15,485 m of embankments and 58 irrigation and drainage culverts along a roughly 7.9 km canal section. It specifies a 55 m channel and a replacement bridge navigation opening 50 m wide and 7.5 m high [3]. The 2023 ESIA describes the old bridge's horizontal clearance as 30 m [4]. These are design and assessment figures; issued quantities and construction arrangements govern the bid.
The bridge opening has its own delivery programme
The channel cut, bridge opening and bank-access corridor each constrain a different part of delivery. A wider dredged section changes available navigation space, while bridge demolition, temporary works and replacement construction can determine passage through the crossing. Dredger, barge and support-craft dimensions must fit the opening and water level available during their assigned work window. On shore, the October plan uses vertical-wall embankments in densely occupied sections to reduce land take and integrates roads with bank alignments [3]. Culvert outlets, wall construction and road restoration then need compatible levels and a sequence that maintains drainage and local access. Marine and landside output estimates need a shared sequence to expose these dependencies.
Evidence conclusion
Price the reach sequence against the crossing constraints
The Cho Lach bid programme should identify the bridge crossing, wall sections, culvert outlets and dredging reaches by chainage. For each reach, connect plant access, bank-work completion, disposal transport and local-road continuity to a dated construction assumption. The A1 bidder can then price the cost of a workable sequence and test an alternative bridge-access date for standby or remobilisation exposure. The employer should define the A1/A3 access and navigation arrangements in the issued documents, including the party responsible for temporary restrictions and their duration. Contract terms determine entitlement if those assumptions change. The invitation assigns 50% to rated technical and non-price factors. The issued rated criteria govern method-statement preparation; detailed scoring and risk allocation come from the bidding documents. Its stated submission time is 10:00 on 23 November 2026, Hanoi time [1].
Outstanding evidence
- Latest A1 amendments and issued technical-scoring criteria
- A1/A3 crossing access, temporary navigation restrictions and work sequence
- Issued bank, drainage, road and dredging quantities by chainage
Subject index
Related subjects
These subject pages bring together related projects, technical articles, reports, and evidence methods.
Sources used 4
- Request for Bids: Package A1, signed invitation, pages 1-2 Ministry of Construction / PMU-MW, 28 September 2026; public Ministry attachment, read 4 November 2026
- Procurement Plan: revised STEP works table, physical page 6 PMU-MW / World Bank, 13 August 2026; earlier January 2024 plan retained separately on pages 1-5
- Vinh Long province subproject: updated Resettlement Plan, printed pages 16 and 19 PMU-MW / World Bank, October 2026; disclosed 22 October 2026
- Southern Waterways Logistics Corridors ESIA, printed pages 64-65 PMU-W / World Bank, November 2023 disclosed version; describes the existing bridge and proposed replacement
Card photo credit: Historical Cho Lach canal view: 2010 according to source metadata; current file uploaded 11 April 2014. The pictured bridge is unidentified.
Bùi Thụy Đào Nguyên (Thuydaonguyen) / Wikimedia Commons; author's public-domain dedication with fallback grant. Cho Lach canal, historical 2010 context per source metadata. Cropped and resized. Current file uploaded 11 April 2014; bridge identity unverified. Bùi Thụy Đào Nguyên (Thuydaonguyen) / Original source. File-specific author declaration: Author's public-domain dedication and fallback grant.
Changes: Cropped at x=0, y=850 to 3,296 x 1,610 pixels; resized to 1,200 x 586 pixels by IMWO.
The selected author declaration dedicates the image to the public domain, with fallback permission for any purpose subject to legal requirements. Author attribution and the historical context are retained.
This notice covers this photograph and the stated image changes only; article text and other site content are excluded.
View credited photo · Credit as text · Download photo with credit
