Feasibility Study for Noordoewer/Vioolsdrift Dam Project
This presentation outlines the purpose, progress, and the way forward for the Noordoewer/Vioolsdrift Dam project, which aims to provide water management solutions and meet increased demands in the Orange River System. The study started in 2015 but faced delays due to unforeseen circumstances, prompting the need for a revised dam size. Despite challenges, the study is progressing towards completion by March 2020, with additional bridging studies required before implementation.
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
You are allowed to download the files provided on this website for personal or commercial use, subject to the condition that they are used lawfully. All files are the property of their respective owners.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author.
E N D
Presentation Transcript
NOORDOEWER / VIOOLSDRIFT DAM (NVD) FEASIBILITY STUDY PRESENTATION TITLE Presented by: Name Surname Directorate Briefing to the Continuation of the Integrated Vaal River System Reconciliation Strategy Study (Phase 2) meeting Date 30 October 2019 Presented by: Christo Dudenski: Study Manager 1
Purpose of Noordoewer/Vioolsdrift Dam 1. Replacement of loss in yield due to the impact of the Lesotho Highlands Water Project Phase 2 (Polihali Dam), which will transfers water to the Vaal River in 2024. Compensate for impact on yield due to the implementation of the Reserve in the Orange River (Prelim. 2017, Final 2024). Provide re-regulation storage in the Lower Orange River - allow releases to correct seasonal flow distribution in accordance with the Ecological Reserve. Provide additional system yield to meet demands in the Orange River System, especially for large-scale Namibian irrigation (about 230 million m3/a in 2050) and some RSA demands in the Lower Orange River. 2. 3. 4. 2
STUDY AREA STUDY AREA Windhoek Hardap Dam Pretoria Johannesburg Neckartal Neckartal Dam Dam Keetmanshoop Naute Dam Vaal Dam Grootdraai Dam Bloemhof Dam Welkom Sterkfontein Dam Upington Noordoewer Vioolsdrift Katse Dam Maseru Noordoewer / Vioolsdrift Dam site Polihale Dam site Springbok Vanderkloof Dam Gariep Dam Verbeeldingskraal Dam site
Progress 1. The NVD Study started in Sep 2015 and was planned to be completed by Aug 2017. 2. Substantial progress was achieved for the originally selected dam size of 2,800 million m3 (73 m) 3. By June 2017, the study was nearing completion. 21 out of a total of 24 reports were produced in draft format and were close to finalization. Over 85% of the study budget was spent. 4. The outstanding work was the completion of EIA, Legal and Institutional arrangements, Record of Implementation Decisions (RID) and Main Report. 5. However, due to unforeseeable circumstances (Reserve water requirements), which became known in June 2017, the study stalled and completion was delayed by over 2 years. 4
Way Forward 1. The Preliminary Reserve determination study completed by DWS in June 2017 suggested that the previously recommended large dam size will likely be unacceptable from environmental perspective. This was confirmed through various meetings with relevant authorities in RSA. Therefore an alternative, smaller and ecologically acceptable dam size, need to be investigated. It is likely that such alternative would be in the order of 450 million m3 to 650 million m3. Therefore, a variation of the scope of work for the current study was required. An agreement on the variation could not be reached. PWC decided that the current study should be completed without a variation of the scope. The study proceeded on this basis and will be completed before end of March 2020. The finalisation of reports is in progress. However, a follow-up bridging study would be required before implementation could commence. 2. 3. 4. 5. 5
Bridging Study 1. The bridging study will include the following main elements: Engineering, geotechnical and economic studies to finalise the recommended optimal dam size and site. Finalisation of the feasibility level designs, cost estimates and RID for the optimal dam. Finalisation of the institutional and legal arrangements. Finalisation of the EIA process and environmental authorisation. 2. The decision on the bridging study should be finalised during the next PWC meeting before the end of 2019. 3. It may take 12 months to follow procurement procedures and another 18 months to complete the study. 4. International funding should be actively pursued. 6
Implementation programme: Largest Small NVD Water Supply Next Scheme after VBKD NVD Feasibility Study Largest small NVD Construction 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2045 Water Supply Next Scheme (VBKD) Namibia-RSA Negotiations NVD Water Supply Note: Decision/ Finance Design/Doc. Phase NVD: Noordoewer/Vioolsdrift Dam VBKD: Verbeeldingskraal Dam Red font : Target date for augmentation 7
