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WEST AFRICAN POWER POOL (WAPP) PÖYRY ENERGY LTD. Mount Coffee HPP ESIA and RAP 2012-09-18 ESIA Report Page 214 28 CUMULATIVE IMPACT ASSESSMENT OF ST. PAUL RIVER DEVELOPMENT 28.1 Scope This Chapter provides an assessment of cumulative impacts of the planned hydropower cascade on Mount Coffee River. The assessment is done entirely based on available documentation and information. No site visits to or specific field work for the three planned reservoirs upstream of Mt. Coffee HPP were carried out. 28.2 The St. Paul River Cascade A short description of the cascade was provided in Section 3.7. For easier reference, the figure providing an overview of the cascade is reproduced here. Via Stage 2 N/A Project SP-2 Project SP-1B Mt Coffee HPP Figure 28-1: St. Paul River Drainage Basin including the HPP Developments. Source: provided by LEC during Kick-off-Meeting Project Name Stage 1 Stage 2 Mount Coffee 66 MW 122 MW SP-1B 78 MW 143 MW SP-2 120 MW 220 MW Via --- 132 MW Total: 264 MW 617 MW The cascade to be used as a reference for the CIA still needs to be defined. Presently, there are mainly two descriptions, one provided in the Main 1982 reports, the other from the Stanley 2008 report. The latter focuses on the “Optimal” Mt. Coffee Development
WEST AFRICAN POWER POOL (WAPP) PÖYRY ENERGY LTD. Mount Coffee HPP ESIA and RAP 2012-09-18 ESIA Report Page 215 (Stage 1 above), as opposed to the “Ultimate” one (Stage 2 above). The main difference between these two is the size of the Via reservoir. Since this, from an environmental point of view, is a very decisive parameter, data from the Main 1982 reports are used for this preliminary assessment. As just mentioned, the Via reservoir is a decisive feature of the cascade. It is a large reservoir which will provide storage and regulating capacity for the entire cascade. Since the catchment of this dam, the Via River, is rather small, Stage 2 development foresees the construction of an additional dam, SP-4, u/s of the confluence of St. Paul River with Via River; this (rather small) reservoir will be connected with the Via reservoir by a channel, and water will be diverted to this large storage reservoir (see Figure 28-2). Figure 28-2: Via Reserovir and SP-4 project: layout Source: Main 1982 The entire cascade is shown in the Figure below. This Figure also provides an indication on the sizes of the different reservoirs; unfortunately, the report does not provide any data on reservoir size.
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