Objective and Purpose of the Assignment
 | The Asian Development Bank (ADB) and the Government of Indonesia have initiated the preparation of the proposed Regional Water Supply Project (RWSP). The proposed project aims to improve equitable access to safe drinking water by addressing disparities in raw water availability. RWSP will support the government’s goal of achieving universal access to safe drinking water by 2045 and will serve as a model for effective, efficient, and sustainable water management. The proposed project is expected to benefit 204,000 people (with a potential reach of 1 million) across 7 cities and 13 regencies in 8 provinces, as follows: (i) North Sumatera (City of Tebing Tinggi, District of Serdang Bedagai); (ii) West Sumatera (City of Bukit Tinggi, District of Agam); (iii) Banten East (District of Lebak, District of Tangerang); (iv) East Kalimantan (City of Bontang, District of Kutai Kertanegara). (v) North Sulawesi (City of Bitung, City of Manado, District of Minahasa Utara); (vi) Gorontalo (City of Gorontalo, District of Bone Bolango, District of Gorontalo); (vii) West Sulawesi (District of Polewali Mandar, District of Majene); and (viii) South Sulawesi (City of Parepare, District of Enrekang, District of Sidrap, District of Pinrang). This will be achieved through (i) the construction of climate-resilient regional water supply systems (Sistem Penyediaan Air Minum Regional [SPAM Regional]), including raw water intakes, transmission and distribution pipelines, bulk water treatment plants, and household connections; (ii) the strengthening of the regulatory environment for regional water management; and (iii) the improvement of institutional effectiveness for service providers in areas such as governance, digitalization, and asset management. RWSP is proposed to be financed through an ADB loan of $372 million, covering (i) upstream assets for raw water intakes and transmission; (ii) water treatment facilities; (iii) regional water transmission lines; (iv) main distribution lines; and (v) secondary and tertiary distribution lines, as well as pilot household connections for approximately 20% of the total targeted service coverage area. Provincial, city, and district governments are expected to cover costs related to (i) land acquisition and clearance; (ii) development of offtakes; (iii) main distribution lines in Gorontalo province; and (iv) secondary and tertiary distribution lines and household connections not covered under the proposed loan. RWSP is still in the preparatory phase, with detailed engineering designs (DEDs) and cost estimates prepared in 2022 under Loan 3455-INO: Accelerating Infrastructure Delivery through Better Engineering Services Project (ESP). Loan approval is expected by the end of 2026, with project implementation tentatively scheduled to start from 2027. The Ministry of Public Works (MPW), through its Directorate General of Human Settlements (DGHS), is the proposed executing agency. The implementing agencies are (i) the Directorate General of Water Resources (DGWR), responsible for the development of upstream assets; and (ii) DGHS’s provincial technical units (Balai), responsible for day-to-day implementation in each target province. For this assignment, ADB seeks to recruit an international Hydraulic/Water Supply Engineer (the Consultant) to conduct hydraulic network and demand checks, as further detailed in Section Detailed Tasks and/or Expected Output. |
Scope of Work
| The Consultant will conduct hydraulic network and demand checks in the target project areas to assess the technical soundness, adequacy, and sustainability of the proposed system designs and projected service coverage. The Consultant will be recruited as an individual consultant and will collaborate with the project team from ADB’s Water and Urban Development Sector Office (SG-WUD) and the Indonesia Resident Mission (IRM). She/he will work as part of a team of international and national consultants recruited separately by ADB for project preparation. Specifically, she/he will collaborate closely with the consultants responsible for validating and updating the DEDs previously prepared under ESP. She/he will report to the ADB Project Team Leaders. |
Detailed Tasks and/or Expected Output
| The Consultant will conduct the following tasks. Hydraulic network checks Review existing DEDs and assess the hydraulic design of proposed regional water supply systems (e.g., transmission pipelines, distribution networks). A digital copy of the DEDs and hydraulic models will be provided to the Consultant upon commencement. Verify that pipe sizing, flow velocities, and pressure conditions meet national and international design standards across all target provinces. Validate existing or conduct hydraulic models of the proposed networks to identify potential bottlenecks, pressure deficiencies, or system inefficiencies. Assess the climate resilience of the network design, including the capacity to maintain service levels under variable raw water availability and extreme weather conditions. Review the proposed interconnections between regional systems and existing local networks to ensure hydraulic compatibility and operational efficiency. Identify design gaps or risks and provide recommendations for optimization. Demand checks Review and validate current and projected water demand estimates for the 7 cities and 13 regencies. Assess the methodology used for demand forecasting, including population growth projections, per capita consumption rates, and non-revenue water (NRW) assumptions, and make any adjustments if required. Verify that the proposed system capacity is sufficient to meet current and future demand up to the project horizon, accounting for climate-related variability in raw water availability. Review and assess feasibility of reaching household connection targets. Provide recommendations on demand projections and system sizing. The Consultant will prepare a Hydraulic Design Due Diligence Report compiling findings and recommendations, and will update the hydraulics models. These deliverables will serve as a critical technical input to inform the update of the DEDs. |
Minimum Qualification Requirements
| The Consultant shall possess the following qualifications and experience: Master’s degree in civil engineering, environmental engineering or any other related fields. At least 10 years of professional experience in water supply and hydraulic modelling. At least 15 years of general experience in water and urban infrastructure development projects with at least 5 years’ participation in ADB financed projects. Proficiency in hydraulic modeling software (EPANET, WaterGEMS, or other relevant software). Experience in working with government agencies and local communities on water supply projects in Southeast Asia is preferred. |
