Call for Individual Short Term Consultancy Service
Call for Individual Short Term Consultancy Service
(National/International) for Small Scale Weir Design (SWD)
Project Title: Community Watershed-based Agriculture and
Fishery Development (CWAFD)
Implementation Agency: Research Development Training Center (RDTC) Savannakhet University (SKU), Lao PDR, Sleumphrakiet Campus Kasetsart University (SLKU) Kingdom of Thailand ,Hue University -Biotechnology Institute (HUIB) RS Vietnam
Location of Implementation: Khammouane and Savannakhet Province Lao PDR
Period: November 2025
Introduction
Team of researchers and development practitioners from three regional
institutions namely Research Development and Training Center Outreach,
Savannakhet University (RDTC-SKU) Lao PDR, Division of Research and Development
Sleumprakiat Campus Kasetsart University (DRD-KU) and Hue Institute of
Technology Vietnam received a
competitive fund to implement a development project entitled “Community Water
Resource-based Agriculture and Fishery Development (CWAFD), with a main object
of strengthening rural household farmers in community water resource management
in the three regions of three country
(Savannakhet and Khammouane province (Lao PDR), Sakon Nakhon province
(Thailand) and Hue province (Vietnam). One of CWAFD Project objective is to design 6
small scale earthen weirs with length varying from 20-30 meters, height 2-3
meter and width 3 meter, that is what the TOR about.
The proposed weir shall have approximate dimensions of 30 meters in length, 3 meters in width, and 3 meters in height. The primary purpose of the weir is to regulate water flow, support water management objectives, and ensure operational safety in accordance with the specified environmental and hydrological considerations. The design process will encompass hydraulic, structural, and environmental aspects to ensure a resilient, efficient, and compliant structure capable of meeting the project’s overall goals.
I. Background and Context
A weir is a
critical hydraulic structure used to regulate water flow, measure discharge,
and manage water levels in rivers, streams, or canals. The proposed weir,
measuring 30m in length, 3m in height, and 3m in width, is intended to
support the management of water resources in [insert location/project area].
The design of this
weir will address key objectives such as water flow regulation, flood control,
water diversion for irrigation, and environmental management. The structure
will also contribute to sustainable water resource management, ensuring
long-term resilience against hydrological and environmental challenges.
This Terms of
Reference (TOR) outlines the requirements, objectives, and scope of work for
designing the proposed weir. It serves as a guiding document for the design
consultants or engineering teams tasked with delivering the project.
II. Objectives
·
To develop a comprehensive structural and hydraulic
design for the weir meeting specified dimensions.
·
To ensure the design facilitates efficient water flow
control and safety.
·
To prepare detailed drawings and specifications
suitable for construction.
·
To incorporate environmental and safety considerations
in the design.
III. Scope of Work
· Conduct site survey and geotechnical investigations.
· Perform hydraulic analysis to determine flow capacity and spillway
requirements.
· Develop structural design including foundation, support, and
superstructure.
· Prepare detailed technical drawings and specifications.
· Estimate project costs and prepare a bill of quantities.
· Develop construction methodology and operational guidelines.
·
Ensure compliance with relevant standards,
codes, and environmental regulations.
IV. Methodology
for the Terms of Reference (TOR) for the Design of 6 Weirs (Size:
about 30m x 3m x 3m)
The methodology outlines the
step-by-step approach and processes required for the design of the weir,
ensuring all technical, environmental, and operational aspects are addressed
comprehensively. The methodology ensures the delivery of a high-quality design,
meeting project objectives and adhering to engineering and environmental
standards.
4.1 Data Collection and Site
Investigation
1) Hydrological Data Collection:
·
Gather historical and current data on
river flow rates, seasonal variations, and flood frequencies.
·
Analyze sediment transport and deposition patterns.
2) Topographical Survey:
·
Conduct
a detailed topographical survey of the project site and surrounding area to assess
elevations, river cross-sections, and potential construction constraints.
3)
Geotechnical Investigations:
· Perform
on-site soil tests to determine the geotechnical properties of the foundation
material.
· Assess
the site’s suitability for building a stable and durable weir structure.
4.2 Environmental and Social
Assessment:
·
Identify potential environmental impacts,
including effects on aquatic ecosystems, sediment transport, and water quality.
·
Engage local communities and stakeholders
to gather feedback and address social concerns.
4.2 Hydraulic and Structural Design
Analysis
1) Hydraulic Modelling:
· Develop
a hydraulic model to simulate river flow patterns before and after the weir
construction.
· Assess
the impact of the weir on upstream and downstream water levels, flow
velocities, and flood risks.
2) Water Flow and Discharge
Calculations:
·
Calculate the weir’s capacity to regulate
water flow under different hydrological conditions.
·
Design for maximum discharge during peak
flood conditions.
4.3
Structural
Design:
·
Develop a detailed structural design of
the weir based on the specified dimensions (30m x 3m x 3m).
·
Consider factors such as stability,
durability, and resistance to water pressure, sediment load, and erosion.
·
Incorporate additional features such as
energy dissipation measures, spillways, and fish passes, if required.
4.4 Environnemental and Social Intégration
1) Environmental Impact Mitigation:
·
Propose measures to mitigate potential
environmental impacts, such as fish migration barriers or erosion.
·
Include provisions for sediment management
to prevent buildup upstream of the weir.
4.5
Social
Impact Management:
·
Address any potential displacement or
disruption to communities caused by the project.
·
Include recommendations for involving
local stakeholders in the design and construction process.
4.6 Design Documentation and
Verification
1. Preparation of Design Documents:
- Develop detailed engineering drawings, showing
the layout, dimensions, and materials for the weir.
- Prepare a Bill of Quantities (BoQ) and cost
estimates for construction.
2. Design Verification:
- Conduct peer reviews and technical evaluations
to ensure the design meets required standards.
- Verify compliance with local and international engineering
codes and environmental regulations.
4.7. Operation and Maintenance
Planning
1. O&M Manual Development:
- Develop a comprehensive operation and
maintenance (O&M) manual for the weir.
- Include guidelines for routine inspections,
cleaning, and repair of structural components.
2. Training and Capacity Building:
- Provide training for local operators and
stakeholders to ensure proper management of the weir.
V. Reporting and Deliverables
Final
Deliverables: deliver the final design package, including:
§
Submit finalized proposal on day1
§
Submit detailed design drawing on day 10s.
§
Hydraulic modeling results (e.g.
catchment; water level and flow ).
§
Short environmental and social impact
assessments.
§ Cost estimates
and BoQ.
§ O&M manual
§
Final report on day 20 (max 30 pages,
excluding drawings).
VI. Timeline and Milestones
The methodology will be implemented
within a specified timeline, ensuring that each phase is completed on time. Key mile stones include:
- Day1 and 2 conduct site survey (site 1,2,3,4) at
Phonpheng zone, Nongbok district Khammouane Province.
- Day3 conduct site survey (site 5) at Nasob zone,
Xayboury district Savannakhet Province.
- Day 4 conduct site survey (site 5) at Huay zone,
Kaysone City Savannakhet Province.
- Day 15 submit detailed design drawings and
hydraulic modeling results
- Delivery of final reports and manuals (Including
cost estimate and BOQ).
VII. Payment
The payment will be in the
form honorarium of which the rate will
be negotiable, DSA and travel cost will
be covered by the project:
· The first payment (50%) will be
effectuated upon the submission of the details drawing designs
· The second payment (40%) will right
after the submission of final report
· And the last payment(10%) will be
made upon the final report is approved
VIII. Qualification and Experience
· Hold at least higher diploma
(Associate degree) in Irrigation Engineering and Water Resource Management ,
preferable majoring in small scale weir and dam design in low land areas
· Experience at least 5 years in
small scale irrigation dam and weir design, special consideration will be given
to the applicants who have experience in this areas, in the central region
(Khammouane and Svannakhet Province).
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