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Tender Details
- Country: Somalia
- Summary: Consultancy Topographical Survey for Urban Rainwater Drainage Design
- SOT Ref No: 50881632
- Deadline: 11 Mar 2021
- Competition: ICB
- Financier: Other Funding Agencies
- Purchaser Ownership: -
- Tender Value: Refer Document
- Notice Type: Tender
- Document Ref. No.:
- Purchaser's Detail :
- Description :
- Tenders are invited for Consultancy Topographical Survey for Urban Rainwater Drainage Design in Yaqshid and Karaan Districts (Banadir Region), Somalia. TERMS OF REFERENCE FOR CONSULTANCY TOPOGRAPHICAL SURVEY FOR URBAN RAINWATER DRAINAGE DESIGN IN YAQSHID AND KARAAN DISTRICTS (BANADIR REGION), SOMALIA Job Description TERMS OF REFERENCE FOR CONSULTANCY TOPOGRAPHICAL SURVEY FOR URBAN RAINWATER DRAINAGE DESIGN IN YAQSHID AND KARAAN DISTRICTS (BANADIR REGION), SOMALIA 1. BACKGROUND Concern Worldwide is a non-governmental, international, humanitarian organization dedicated to the reduction of suffering and working towards the ultimate elimination of extreme poverty in the world-s poorest countries. Concern engages in long-term development work, responds to emergency situations, and seeks to address the root causes of poverty through development, education and advocacy work. 2. CONSULTANCY SERVICE Concern Worldwide is a member of the Building Resilient Communities in Somaliland (BRCiS) consortium and is currently implementing theprogramme Somaliland Humanitarian and Resilience Programme (SHARP) funded by the UK-Government Foreign and Commonwealth Development Office (FCDO) for the period 2018-2022. The programme goal is to enhance the resilience of vulnerable and marginalized communities to recurrent shocks and stresses and engage in sustainable nutritionally sensitive livelihood strategies. In Banadir region, Concern Worldwide and the implementing partner, Youthlink, engaged with five communities in 2019 to lead a vulnerability and risk analysis and a participatory process to prepare Resilience Community Action Plans in coordination with district authorities. The Community Action Plans consider in Sahan community (Yaqshiid district) and Bulo Eyle community (Karan district) consider mitigating the recurrent risk of urban flash-flood through improvements in the storm water drainage infrastructure. The purpose of this consultancy is to conduct a topographical survey and related assessments in the preselected urban communities to establish the topographical conditions that will inform construction of drainage channels aimed at draining the accumulated storm water during rainy seasons. This will improve the sanitary conditions of communities living in the area, reducing the transmission of water related diseases and the negative impacts of recurrent flooding on urban poor livelihoods. 3. OBJECTIVES To carry out the topographical (topo) survey using latest topographic survey equipment (Total Station, Auto Level, Digital level, differential GPS (DGPS), and Global Navigation Satellite System (GNSS)), preparation of layout map and digital terrain model for construction of drainage in Sahan community in Yaqshid district and Bulo Eyle community in Karan district. The terrain between these locations is gentle sloping and highly populated with limited access along the existing route. The proposed drainage will be along the existing road, or be in close proximity, to the existing road determined by the topography. The survey will be carried out in stages, with the lower level alignment carried out initially and higher elevations carried out at a later stage. The subsequent stage of topographic survey will be completed within 20 days. Topo mapping shall be carried out for a minimum width of 20m from centerline on each side of the road (total width 40m) along the proposed stretch estimated distance of 2km, for each village. The survey shall cover any possible seasonal stream section adjacent/ parallel to the road. Also, the survey extent shall be increased based on consultant requirement. If additional survey will require during the detailed design stage due to changes in alignment or any other purpose, the consultant shall perform the survey based on Concern Engineer requirement. Coordinates of proposed alignment shall be provided to the survey team for all required areas. The contactor shall fulfil any changes required in Topo Survey during the design stage. The sections shall be taken every 10m spacing along the proposed alignment. The UTM coordinates system shall be followed for the survey work. Due to the nature of the terrain and climatic conditions along the proposed alignment the site works will be carried out within Carry out Environmental Impact Assessment (EIA) for the proposed boreholes to ensure that proper planning is done and that likely potential negative impact that might arise from developing the project are identified and that appropriate mitigation and monitoring measures are included in the project design. 4. LOCATION The geographical scope of the project covers two distinct urban communities: Name of the site N o E Sahan community in Heegan subdivision on Yaqshid district. 2° 3-17.79″N 45°21-8.06″E Bulo Eyle community in Nageyle sub-division of Karan district. 2° 3-32.09″N 45°22-1.77″E Within each community, YouthLink and Community Resilience Committees (CRC) have identified the high flood-prone areas and vulnerable households affected, estimated to 200 household in Bulo Eyle and 150 households in Sahan. 5. METHODOLOGY The Consultant shall provide details of resource (professional surveyors and labour), specialist survey sub-Consultants (if required) and plant (calibrated and sufficient to provide the specified accuracy along with the bid. The Consultant will submit a program of the site survey teams, which are anticipated to be a minimum of 4No, such that the works can be completed within the limited time period available for site access. The program, including plant and survey teams will be submitted with the bid to provide assurance that the Consultant is capable of completing these works within the limited access period. The topographical survey shall consist of the following: o Fixing of Primary survey control with static method use GNSS adjustment and GNSS salutation software; o Fixing of Secondary survey control with RTK fixed and AutoCAD Civil 3D 2018 & related Software; o Vertical Controls by Auto level/ Digital level machine; o Details topographic survey, and o Data analyse and preliminary survey drawing provide A3 Size (including plan, profile and cross sections). Level Traversing shall be conducted using Auto level/ Digital level and having accuracy of +/- 5mm in 1 km double run. Benchmark pillars shall be connected to nearest bench mark. Benchmark level also to be transferred on major permanent structures at least once in every 250m with sequential numbering and as per the instructions of the Engineer in charge of the site. The Total station traverse shall be closed with the nearest pillar. Traversing shall be carried out using (having an accuracy of two sec.) to fix the co-ordinates on the benchmark pillars. Two rounds of angle measurements to be taken on both left and right face in both clockwise and anticlockwise direction. The angle spread between observed round shall not be more than 5 sec. Traverse shall be closed within an accuracy of 1 in 20000. Topographic survey is to be carried out using latest topographic survey equipment (Total Station, Auto Level, Digital level, differential GPS (DGPS) and GNSS), the horizontal and vertical accuracy shall be +/- 5mm. The equipment shall be checked periodically for horizontal and vertical collimation. Vertical control must be done by Auto/ Digital level machine. For the Primary survey control point,Dual reference pillars shall be established once in every 1 km using GNSS Static method having valid calibration certificate. Reference pillars shall be in the form of concrete blocks of size 40 X 40 X 120cm with proper foundation as per the instructions of the Engineer in charge of the site and shall be embedded to a depth of minimum 40cm in to the ground. The transfer time shall be such that the accuracy achieved shall be better than 1 in 20000. Regarding the Benchmark Pillars Specifications, Benchmark (BM) pillars shall be established at 250m intervals in the form of precast concrete blocks of size 30 X 30 X 60cm and shall be embedded to a depth of 30cm in to the ground. The BM pillars shall be painted in yellow and details such as BM number and reduced level shall be clearly marked on it with red paint. All BM pillars shall be numbered sequentially as per the instruction of the Engineer in charge of the site. Wherever the new benchmark pillars are laid, the level traverse shall be closed. 5.2 Environmental Impact Assessment Conduct an environmental impact assessment for the project which includes; o Nature of the project, location of project area o Activities that shall be undertaken during the construction of the drainage channel o Project design, materials to be used and by products, and disposal methods. o Identified environmental impacts of the project (both positive and negative) during the i) survey phase and ii) the drainage construction phase. The assessment should consider impacts on: -Water resources -Soil/land -Vegetation -Land use o Economical and socio-cultural impacts associated to the potential environmental impacts identified. o Any other information the authority may require. 5.3 Production of designs Drawings and Bill of Quantities Based on the data collected, produce detailed drawings, BOQ and technical specifications of the works to be undertaken. 6. DURATION OF WORKS The duration of the consultancy will be decided by the consultant in agreement with the WASH and construction Coordinator but should not exceed 20 days from the date of signing agreement. A proposed work and travel plan will be developed during the consultation meeting above. The consultant will prepare a tentative work plan for the study and include this in their offer. The work plan should set out the timelines of the following activities; o Acquisition and review of secondary data in the office; o Assess
- Documents :
Purchaser : CONCERN WORLDWIDE
BANADIR REGION
Email :procurement.mogadishu@concern.net / haron.emukule@concern.net / paz.lopez@concern.net
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