National Sewerage and Sanitation Engineer

CTG Overview

CTG staff and support humanitarian projects in fragile and conflict-affected countries around the world, providing a rapid and cost-effective service for development and humanitarian missions. With past performance in 17 countries – from the Middle East, Africa, Europe, and Asia, we have placed more than 20,000 staff all over the world since operations began in 2006.

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Overview of Position

Background:

• The Aden fishing harbour, located in Yemen, serves as a vital infrastructure hub for the country’s fishing industry & coastal economy. Established in the late 1970s & operational by 1986, the harbour was equipped with comprehensive fisheries handling, processing & marketing facilities. Spanning an area of 96,612 square meters, it played a crucial role in connecting the eastern & western coastal governorates along Yemen’s coastal strip.
• However, years of conflict, neglect & insufficient maintenance have severely compromised the harbour’s infrastructure. Key components, including wastewater facilities, roads, electrical systems & sewage networks, have deteriorated significantly. The harbour’s operations were suspended due to issues such as corroded sewage pipes, damaged pumping stations & outdated treatment facilities, which pose risks to public health & the marine ecosystem.
• Our client in Yemen has undertaken the initiative to rehabilitate the harbour as part of its efforts to improve food security, boost economic recovery & empower coastal communities. The restoration project aligns with the United Nations Sustainable Development Cooperation (UN SDG) framework (2022 – 2024), emphasizing sustainable infrastructure development & environmental conservation.
• The existing sewage system consists of old 8 inches pipes, which discharge by gravity to a pumpstation. All surrounding buildings are connected to the pipeline or directly to the old pumping station, which is submerged by waste.
• The wastewater is discharged to the sea by a low head pump through a new 6 inch UPV pipeline. The system is serving the population of Hojef as well, which has grown dramatically. wastewater partial treatment was provided by septic tanks originally.
• For handling surface water, a separate system using open channels or large diameter concrete pipes is provided discharging at several places to the sea.
• There is an old pumping room, but its contents do not exist and are flooded with waste. The number of pumps in it was four submersible pumps, which have been operated since the inception of the port after which it was closed. Because it was no longer needed due to continuous use & damage, in addition to a movable diesel powered pump that is also out of service, the drainage is now done through a temporary pump, the capacity of which is determined to be relatively quite low.
• The septic tank, with dimensions of 30m x 10m x 3m, is located on the north western side of the port & constructed in 1980 by a Russian company & commissioned in 1986, it is currently out of service due to a clog in the pipeline that drains into it.
• Rainwater is collected from all project elements & directed onto the road network. A portion of this water is then drained directly to the quay & into the sea, while another portion is diverted to a concrete chamber which is currently out of service, causing water to accumulate above it for days until it evaporates. Additionally, there are non paved, non built, or non asphalted areas designated at the project site where most of the rainwater is drained into the soil below. These challenges highlight the urgent need for an effective stormwater management system to mitigate the adverse impacts of stagnant water, flooding & inefficient drainage.

Previous work included the following tasks:

• Initial assessments & preliminary designs: Identifying critical deficiencies in the waste, sanitation & sewerage systems.
• Site inspections & structural evaluations: Examining conditions of existing infrastructure such as pumping stations, septic tanks & sewage pipes.
• Design recommendations: Proposing comprehensive redesigns to accommodate waste generation from fish processing, vessel activities & domestic sources while adhering to modern standards.

The upcoming work focuses on review the previous works & finalizing detailed designs & implementation plans to achieve sustainable, efficient & environmentally compliant wastewater management solutions for the harbour. The engagement of a Sewerage & Sanitation Engineer is essential to provide expertise in verifying existing designs, addressing identified gaps & developing robust systems that prioritize long term sustainability & resilience against environmental & operational challenges.

Role Objectives

The primary objective is to engage a Sewerage & Sanitation Engineer to:

• Verify, assess documents & reports related to sewage & sanitation.
• Finalize detailed designs & implementation plans for the sewerage system.
• Ensure compliance with local & international standards for wastewater management.
• Provide technical support to complete tender documents & guide the execution of the project.

The consultant will perform the following tasks:

Task 1: Document review & verification:

• Review existing reports, designs, assessments & analyse the findings from the detailed assessments & consultations related to the sewerage & drainage system.
• Verify the feasibility & compliance of proposed solutions for sewage & sanitation.
• Conduct a comprehensive review of the assessment & design of the stormwater drainage network & review the proposal for the drainage structure if appropriate based on topographic, geotechnical & hydrological data.
• Evaluate the feasibility of proposed rehabilitation options, ensuring alignment with project objectives & compliance with all relevant international standards. Additionally, identify the optimal option that meets the outlined criteria, including available resources, cost benefit analysis, budget limitations, economic viability, investment costs & any other required criteria.
• Consider the pros & cons from the designer’s perspective to ensure a comprehensive evaluation that adheres to global best practices.
• Provide a comprehensive report summarizing validated findings, identified gaps & recommendations for further investigation, if needed.
• Prepare recommendations for monitoring & maintenance plans post rehabilitation.
• Propose detailed rehabilitation & reconstruction strategies, including structural repairs, material enhancements, protection measures for the selected rehabilitation option, risk assessment, mitigation strategies, tentative design & construction schedules.
• Cross check from the needs assessment for design data like identify waste generation sources, including fish processing, vessel activities & domestic waste from workers, staff & calculate peak flow & load capacities based on harbour activity levels.

Task 2: Stakeholder consultations:

• Engage with key stakeholders, including our client, harbour authorities, Local Water & Sanitation Corporation (LWSC) & District Cleaning Fund (DCF) & relevant to gather feedback on the findings & recommendations of the detailed assessments & consultations.
• Conduct virtual or in person consultations as necessary to align on project priorities & address potential technical or operational concerns.
• Document the outcomes of consultations, highlighting key inputs & decisions that will influence the scope of rehabilitation work.
• Conduct regular coordination meetings with the project team, our client & harbour authorities to review progress, resolve any design issues & ensure alignment with the project’s objectives.
• Coordination with Engineers who are working on the site on shared tasks is crucial to avoid conflicts, ensure efficient resource use & maintain progress through regular communication & clear responsibilities.

Task 3: Development of design:

Prepare the final design brief & conceptional design:

In this part, the consultant is expected to develop & confirm a mature concept for the required design works including determining the scope of work. This should be supported with detailed environmental assessments, design sketches, project plan & other required elements. The consultant will prepare the design concept(s) to obtain the best option that meet the following criteria:

• Review & refine the scope of work based on findings & recommendations.
• Functional, operation & aesthetic requirements to meet the stakeholder inputs.
• Available resources.
• Topographical, geotechnical, geological, hydrological & meteorological constraints.
• Site, resource, social & environmental constraints.
• Safeguarding considerations.
• Cost benefit analysis & budget limitations.
• Risk assessment & mitigation strategies.
• Sustainability.
• Pros & cons, economic viability, investment costs criteria & any other required criteria from the Designer perspective.

In this phase, the consultant shall prepare the concept design, concept layouts, a brief regarding required structural, coordination, systems, assessment of the site seismicity for the project, etc. Also to deliver a concept design for the remaining other facilities as applicable. it is also required to review & determine the design codes that will be adopted, after making sure that they are applicable in Yemen. The consultant should also coordinate closely with the Project Coordinator, the Project Manager & the Project Engineer in regard to the expected cost of the proposed solutions & keep track with the available project budget. Specify construction materials that are going to be used, identify, assess the nearest & most suitable resources. Consider the use of innovative materials or construction techniques to enhance the project’s sustainability. Map out the supply chain, including transportation routes, delivery schedules & storage requirements for materials. Consider potential delays or interruptions & propose mitigation strategies. In case where multiple design options are prepared, they should be evaluated across the abovementioned criteria to select the best option for design concept.

Include the selected option, covering but not limited the:

• Design gravity & forced pipeline systems using UPVC & HDPE pipes, respectively.
• Integrate sedimentation chambers, grease traps & screening systems to handle fish waste & other residues.
• Ensure proper pipe slopes, velocities & diameters for self cleansing & blockage prevention.
• Include structural integrity measures for manholes, pumping stations & septic tanks.
• Design wastewater treatment facilities with sedimentation & grease separation chambers to comply with environmental standards for discharge.
• Proposals for durability enhancements & adherence to safety standards.
• Design of new structural components & the remedial measures for structure prepare retrofitting & detail drawings.
• Perform an environmental impact study & safeguarding study, analysing the effects of waste discharge on marine ecosystems, local climate, water currents & tidal patterns.
• Perform sustainability considerations by focus on energy efficient & cost effective operations, use eco friendly materials & designs, comply with local environmental regulations to prevent marine pollution & adopt sustainable sludge management practices like agricultural reuse or safe disposal.
• Perform operational & maintenance plan by establishing a maintenance schedule, train harbour staff on operations, upkeep & ensure accessible components like manholes & pumping stations for inspections & repairs.
• Implementation planning by creating detailed plans with construction schedules, resource requirements, risk mitigation strategies & stakeholder engagement for approvals & feedback.
• Design reports with all related calculations notes (structural, hydraulic & mechanical, etc.). for all the work. Use internationally recognized design software based on established standards & when performing manual calculations, maintain neat & accurate records. The design record must be available for reviews & checks at any time & must be handed over to our client if requested at any time before the end of the assignment. The report should also include an executive summary.
• All the documents should be submitted in Microsoft (Excel, PDF, Word, DWG, revite) & the source of the designed program.
• Related to design international standards (e.g., IPC, ISO, ASTM, BSI, etc), incorporate sustainable practices & comply with local environmental and health regulations.

Propose a dedicated Waste Water Treatment Plant (WWTP) if connection to the municipal system is not feasible. The WWTP should include:

• Primary treatment units: Sedimentation tanks & screens.
• Secondary treatment units: Biological treatment using aeration or anaerobic digestion.
• Sludge management facilities: Drying beds or centrifuges.
• Effluent discharge systems: Compliance with environmental discharge standards.

Develop a specialized solution for the fish processing plant:

• Incorporate grease interceptors & sedimentation tanks to capture fats, oils & solids.
• Install dedicated pre treatment systems to remove fish scales & organic matter before entry into the main sewerage system or WWTP.
• Ensure that wastewater generated by fish processing activities meets pre treatment standards to minimize environmental impact.
• Design easy to maintain systems for cleaning & maintenance in high use zones, such as fish cleaning & processing areas.

Storm water & rainwater drainage system:

• Based on the given & reviewed topographic, hydrographic & road design data.
• Perform detailed hydrological analysis for the harbor & surrounding areas.
• Conduct hydraulic modeling to ensure the drainage system can handle peak rainfall events, accounting for climate change scenarios.
• Ensure compliance with environmental regulations & standards to minimize ecological impacts.

Design a comprehensive stormwater & rainwater drainage system for the harbour to prevent flooding & manage surface runoff effectively:

• Map surface runoff patterns & identify flood prone areas.
• Design the storm drains to efficiently capture & convey stormwater.
• Incorporate sediment traps, grates & filtration systems to prevent debris & pollutants from entering the marine environment.
• Integrate rainwater collection systems to reduce dependency on external water sources where feasible.

Provide the following detailed calculations & modelling requirements:

Hydraulic calculations:

• Flow rate, velocity & pressure calculations for gravity & forced pipelines.
• Self cleansing velocity calculations to prevent blockages in the sewer system.

Stormwater runoff:

• Estimation of peak runoff using rainfall Intensity Duration Frequency (IDF) curves.
• Calculation of catchment area contributions to stormwater & rainwater drainage systems.
• Design of culverts, channels & storm drains based on peak runoff volumes.

Wastewater treatment plant:

• Sizing of sedimentation tanks & grease interceptors.
• Calculation of Biological Oxygen Demand (BOD) & Chemical Oxygen Demand (COD) removal efficiencies.
• Energy consumption models for aeration or anaerobic digestion units.

Structural design:

• Load & stress analysis for manholes, pumping stations & treatment facility components.
• Reinforcement & material specifications to ensure durability & compliance with standards.

Hydrological analysis:

• Rainfall runoff modelling to determine flood risks & drainage system efficiency.
• Tidal & sea level impact assessments on drainage outflows.

Environmental compliance:

• Discharge quality calculations to meet local & international environmental standards.
• Sludge production & disposal calculations for sustainable waste management.

Energy optimization:

• Pumping system design, including flow & head requirements.
• Analysis of energy efficient solutions for wastewater treatment operations.
• Final report for the design brief & conceptional design.

Task 4: Tender document preparation:

Prepare comprehensive technical tender documents, including:

• Clearly define the scope of work, including technical & operational requirements for each component of the project.
• Develop updated & itemized Bills of Quantities (BOQs) with precise cost breakdowns based on local market rates & international best practices.
• Provide detailed technical specifications for materials, equipment, compliance sheet & construction methods to ensure compliance with industry standards.
• Include detailed design drawings & layouts (PDF, DWG, Revit), showcasing layout plans, cross sections, elevations & other critical details for pipelines, manholes, pumping stations, surface drainage & stormwater integration, fish processing plant disposal systems & treatment facilities if needed, connection to the municipal water, structural details for the rehabilitation / new construction of the networks parts, utility coordination plans & environmental management layouts etc.
• Incorporate environmental & safety management plans, outlining measures to mitigate construction impacts, safeguard workers & protect surrounding ecosystems.
• Draft detailed implementation methodologies, timelines & quality assurance protocols for contractor adherence.
• All drawings shall be prepared to ISO standards. They shall include all layouts, sections, details, dimensions, etc. Drawings shall be presented in standard scales, with a minimum scale of 1:100 for engineering plans & a more detailed scale for the detailed drawings. Drawings shall include title blocks featuring the name & logo of the donor, beneficiary & our client. They shall also include drawing numbers, revision numbers, revision dates, legends, scale & the necessary technical content. A complete set of drawings shall consist of, but is not limited to, the following main components namely cover sheet, index sheet, general notes & legend; engineering drawings & book of details.

Task 5: Design support during tendering & construction:

The design support during tendering & construction ensures the successful transition from design to execution by providing critical technical assistance at two key stages namely tendering & construction. Key tasks in this phase include:

Tendering process support:

• Respond to technical queries from bidders as requested by our client, ensuring clarity of the project’s technical requirements & promoting adherence to design specifications.
• Provide clarification on design intent, offer additional information & address any ambiguities in the tender documents to facilitate a fair & competitive bidding process.

Construction phase support:

• Offer ongoing technical support during construction, including responding to inquiries from the construction team & overseeing necessary design modifications due to unforeseen site conditions.
• Ensure that any design changes are effectively integrated without compromising the project’s quality or objectives, maintaining the integrity of the original design throughout the construction period.

Each deliverable will be subject to review & approval by our client & relevant stakeholders. The consultant must ensure that the quality of all deliverables aligns with international best practices & our clients standards. Any revisions or additional information requested during the review process must be incorporated within agreed timelines.

Deliverables: Please see the deliverables details in the link below.

The consultant is expected to adopt a participatory & iterative approach, involving:

• Prepare a methodology for his understanding the task outline in TOR.
• The consultant will thoroughly review existing assessments, topographic survey, reports, drawings & technical documentation to establish a comprehensive understanding of the sewerage & sanitation condition & the prior work undertaken.
• The approach will emphasize meaningful interactions with stakeholders to ensure alignment, address concerns & integrate their inputs into the rehabilitation framework. Regular consultations with relevant authorities, our clients representatives & technical experts will be conducted.
• Field visits, will be undertaken to validate the findings of previous assessments, observe the current structural conditions & gather any additional data needed for accurate analysis.
• Utilizing state of the art tools & software, the consultant will perform detailed structural analyses to assess load distribution, potential failure points & structural resilience under various scenarios. Non linear & dynamic analyses will be used where necessary.
• The methodology will integrate international best practices in marine infrastructure rehabilitation, including sustainable & environmentally friendly techniques, ensuring compliance with applicable standards & codes.
• Draft designs, specifications & tender documents will undergo iterative review processes to incorporate feedback from stakeholders & technical reviewers, ensuring the final deliverables are robust & actionable.
• The consultant will identify potential risks, such as construction challenges, environmental impacts, stakeholder concerns & propose mitigation strategies to address these risks proactively.
• A robust quality assurance framework will be implemented to verify the accuracy & integrity of all deliverables, ensuring alignment with the project objectives & our clients expectations.

Project Reporting

The National Engineering Consultant will work under the direct supervision of the Project Coordinator & the Project Engineer in close coordination with the engineering unit. The consultant will provide regular updates to our client Yemen team on progress, key findings & strategic recommendations throughout the consultancy period. Additionally, the governance structure will include:

• Regular progress reviews: The consultant will participate in bi weekly progress review meetings with the Project Manager & stakeholders to report on milestones, discuss challenges & ensure timely resolution of issues.
• Documentation & reporting: The consultant must maintain detailed records of all activities, including meeting minutes, field observations & technical analyses. These records will be submitted as part of the project documentation & will be subject to review by our client.
• Compliance with standards: All deliverables must adhere to our clients policies on environmental & social safeguards, financial transparency & ethical standards. The consultant is accountable for ensuring that all project activities comply with these policies.

Accountability will be ensured through a transparent reporting mechanism, where progress updates are shared with all stakeholders, deliverables are reviewed & approved based on predefined criteria.

Key Competencies

Academic background:

• A minimum of a bachelor’s degree in civil engineering, environmental engineering, hydraulic engineering or a related field, an advanced degree (master’s or Ph.D.) in a relevant discipline is pdesired.

Experience:

• Minimum 7 years of relevant experience in designing sewerage systems, wastewater treatment plants, stormwater management & drainage systems.
• Demonstrated experience in hydrological & hydraulic modelling using advanced computational tools.
• Previous experience in port or landscaping infrastructure projects, including design & implementation phases.
• Proven track record of working on environmentally compliant projects aligned with international standards.
• Strong analytical & problem solving skills with the ability to address complex technical challenges effectively.
• Performed at least 2 projects as a consultant related to ports’ or landscaping scaled projects rehabilitation & reconstruction related to ( stromwater, waste treatment plant, hydraulic, hydrological analysis, sewage network & structural design). .
• Proven track record in preparing tender documents & BOQs.
• Experience in development of compressive scope of works, BOQ’s, drawings & designs.

Technical expertise:

• Proficiency in using design software such as AutoCAD, Civil 3D, SewerGEMS, StormCAD, HEC-RAS or similar tools for drafting, modelling & analysis.
• Familiarity with local & international codes & standards for wastewater & drainage systems.

Language skills:

• Fluency in English (written & spoken) is required.
• Knowledge of Arabic is an asset.

Core competencies required for this role:

• Ability to work in Yemen governorates specifically in Aden.
• Demonstrates integrity by modeling the UN’s values & ethical standards.

Functional competencies required for this role:

• Strong knowledge & experience in building capacities in reporting, particularly in the context of technical & engineering projects.
• High level of professionalism & the ability to work independently, often in high pressure situations & under tight deadlines.
• Excellent interpersonal communication skills, including the ability to facilitate training sessions, workshops & presentations for diverse audiences.
• Demonstrated ability to engage with stakeholders at multiple levels (government, contractors & our clients teams) & maintain collaborative relationships.
• Proven expertise in technical report writing, including strategic recommendations & detailed engineering assessments.

Team management

• This role has no team management responsibility.

Further information

Facilities provided by our client:

• Our client will provide support letters to facilitate access to the site visits. In addition, they will provide feedback on any inquiry regarding any specific requirements.
• Our client will appoint a focal point for the assignment. All requests for information, guidance & assistance should be addressed & provided to the focal point. This includes liaison with other units & national departments as well as access to any relevant data that is not classified as restricted.
• Other personnel from the organization to be assigned to the project shall be as agreed during the pre contract meeting.

Contract duration:

• The contract will be for a total of 40 working days spread over a 2.5 month period. Specific working days will be allocated based on project requirements, deliverable deadlines & coordination with our client. Additionally, 10% of the contract amount will be retained for one year to support during tendering & construction.

Duty station:

• The consultant will be based in Aden, Yemen with regular participation in meetings with our client & other stakeholders, will be necessary.

Scope of price & payment:

• Payment shall be provided upon satisfactory completion of the deliverables outlined in the table above. Payment requests submitted by the consultant & must be certified by the supervisor(s).
• Payments are to be made within 30 days from receipt of invoice.
• A certification of payment needs to be signed & approved by the direct supervisor.

Other information:

• Qualified female candidates are encouraged to apply for this role.

How to apply

https://app.tayohr.io/jobs/detail/vac-23464-national-sewerage-and-sanitation-engineer-22183