Dam Synchronisation and Flood Releases - agriwaterpedia.info

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DAM SYNCHRONISATION AND FLOOD RELEASES IN THE ZAMBEZI RIVER BASIN: ANNEX 4 OF FINAL REPORT 1.2 General approach To be able to compare the various investment options and weigh their suitability, a set of criteria was used. Each criterion is explained by a question. The criteria have been ordered as a selection process such that, if the first criteria are not answered positively, further analysis is not necessary. For each criterion, a set of aspects is given that have to be taken into consideration when preparing answers. The criteria set is presented in Chapter 10 in the form of a Scorecard. The set of criteria is as follows: A B C D E F G Technical and legal feasibility: Is the investment physically and legally feasible? geologically suitable sites for construction of dams; other physical restrictions (for example from the electrical grid); and impact on, for example, RAMSAR sites. Contribution to flood protection: Does the investment contribute to flood protection? impact on flood flow regime; impact on lead time; livelihoods protected; and capital investment protected. Impact on ecosystems: Does the investment have impact on the river and its associated ecosystem? impact on the flow regime and particularly the ecologically relevant summary statistics (floods, high flow pulses, low flows); impact on the sediment regime for the environment; impact the thermal and chemical regime of the river; and impact on the biological component of the system. Cost effectiveness: Is the investment cost effective for flood protection and/or flow regulation? capital costs; operation and maintenance costs; costs of negative impacts; and costs of additional institutional requirements. Impact on human use: Does the investment have impact on resource economic objectives and other human use? Hydropower; Nature; Fisheries; Agriculture; and impact on other resource economic and human uses (how people use the river and its associated ecosystem). Biophysical impact: Does the investment otherwise have impact on the biophysical behaviour of the river basin? greenhouse gasses emission reduction; evaporation losses; and sediment deposition. Likelihood of realization: Is the realization likely? time necessary for realization 4
DAM SYNCHRONISATION AND FLOOD RELEASES IN THE ZAMBEZI RIVER BASIN: ANNEX 4 OF FINAL REPORT H possibilities for financing including Clean Development Mechanism; political will (as far as reported); and possible local protests. Impact on more than one country: Does the investment benefit more than one country? countries impacted positively; and countries impacted negatively. This criterion is relevant for different financing schemes and for deciding if the decisions require ZAMCOM input. For each investment the criteria are evaluated and color coded. The color coding of the evaluation criteria is presented in Figure 1.3. Because the investments are so different and the criteria cannot be made measurable in this identification stage, the color scoring is subjective. The scoring should be used as a key to reading the evaluation and identifying aspects that need attention, rather than as an absolute scores to be used in a multi criteria analysis. Unlikely to very unlikely / difficult / unsuitable / strongly not recommended / probably high negative impact Possibly (suitable) / uncertain / moderate to negative assessment / pros and cons Probable to very probably / probably suitable to very suitable / (limited) positive impact Not relevant criterion for this investment option / might be a relevant criterion but not part of this study Figure 1.3: Legend for scoring of criteria 5
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