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METSI CONSULTANTS: SUMMARY OF MAIN FINDINGS FOR PHASE 1 DEVELOPMENT Report No. 678-F-001 A-4
METSI CONSULTANTS: SUMMARY OF MAIN FINDINGS FOR PHASE 1 DEVELOPMENT I. TERMS OF REFERENCE FOR CONTRACT 648 (IFR STUDY) CONTRACT TITLE ANNEX B. TERMS OF REFERENCE LHDA CONTRACT 648: THE ESTABLISHMENT AND MONITORING OF INSTREAM FLOW REQUIREMENTS (IFR) FOR RIVER COURSES DOWNSTREAM OF LHWP DAMS OBJECTIVES OF THE STUDY The objectives of the study are: • to assess the instream flow requirement of the Senqu, lower Senqunyane, lower Malibamats’o, and lower Matsoku Rivers; • to assess the long-term impacts of the modified flow regimes resulting from the construction of the proposed Lesotho Highland Water Project (LHWP) dams on the ecosystems of the study rivers, and to provide recommendations for mitigation against, and compensation for, significant impacts linked with the proposed projects; • to recommend a long-term programme to monitor the efficacy of the IFR releases, the results of which can be used to adjust the IFR as required. TASK 1: IFR METHODOLOGY, PARAMETERS AND SITES (a) The study team shall review all currently accepted methodologies for determining IFR. Particular reference shall be given to the methods used for determining IFR in southern Africa and similar environments. Particular efforts shall be made towards the use of comprehensive flow regimes that cater for all river ecosystem components, such as, fish, aquatic invertebrates, water quality, riparian vegetation and the abiotic environment. The advantages and disadvantages of each method shall be identified and pertinently reviewed. The study team shall provide a description of variables to be measured for each methodology selected and provide full justification for its application on a long-term basis to the LHWP. Review and approval of the proposed methodology shall be obtained from the Panel of Experts before proceeding to the subsequent tasks. (b) The study team shall conduct a preliminary reach analysis of each river based on air photo interpretation, satellite imagery and any other accepted method. Classification shall take into account flow characteristics, tributary inflows, geomorphology and geology, land-use, riparian characteristics, scenic resources and other defined characteristics. Reach classification shall be confirmed by field reconnaissance. (c) The salient factors exerting a dominant influence on each reach, including morphological, hydrological, land-use or other factors, shall be identified and described. (d) Hydrological characteristics of each reach shall be described and quantified to the extent possible in each of the rivers over the full range of natural conditions including very wet years and very dry years. Report No. 678-F-001 B-1
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Kingdom of Lesotho Lesotho Highland
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