Hydroelectric Dams Research Articles

Drivers of leafcutter ant populations and their inter‐trophic relationships in Amazonian forest islands

AbstractUnder habitat loss and fragmentation, the intensity of local ecological processes involving species interactions changes pervasively, accelerating local species extinctions, and disrupting essential ecosystem functions. We addressed this issue by examining the direct population drivers of apex predators (five felid species), armadillo mesopredators, leafcutter ants (Atta sexdens and Atta cephalotes), and the indirect effects mediated by their inter‐trophic relationships in a ~25‐yr‐old land‐bridge island system formed by a hydroelectric dam in the Central Amazon. These trophic groups and pioneer tree abundance were surveyed across 34 variable‐sized islands and three continuous forest sites. Leafcutter populations were characterized in relation to their occurrence, colony density, and proportion of inactive colonies, and for each leafcutter response, we considered the direct and/or indirect effects of forest area on each trophic group. Leafcutter occupancy was best explained by the direct model, colony density by either the direct or the indirect model, and proportion of inactive colonies by an indirect model via the effects of pioneer tree abundance. The direct forest area effects were positive for apex predators and leafcutter occupancy, but negative for armadillos and pioneer trees. Yet leafcutter colony density declined in increasingly larger forest areas. The absence or low abundance of apex predators on small islands released armadillo hyper‐abundance, which contrary to expectation from top‐down control, covaried positively with leafcutter colony density. Finally, the indirect model showed that leafcutter colonies were more active under higher pioneer tree abundances. That leafcutter density increases on smaller islands whenever present is likely attributed to the hyper‐abundance of pioneer plants and canopy gaps. Although apex predators apparently suppressed armadillos, the remaining fraction of the food web seems to be controlled by bottom‐up mechanisms most likely related the overall low foliage palatability typical of wet evergreen forests. Our findings can be used to inform the long‐term viability of forest ecosystems affected by hydropower development in lowland Amazonia.

Stakeholder Perceptions on the Governance of Fisheries Systems Transformed by Hydroelectric Dam Development in the Madeira River, Brazil

Hydroelectric dams often have significant impacts on freshwater fisheries. Major impacts are known to be driven by changes in river hydrology and fish ecology, but the role of governance arrangements in mitigating or exacerbating fisheries impacts from hydropower development is less understood. This study presents an analysis of stakeholder perceptions about the effects of hydroelectric dam implementation on fisheries governance arrangements in the Madeira River basin, Brazil. Semi-structured interviews were conducted with 50 stakeholders representing the fishers and fish traders, government, non-governmental organizations, and the private sector. Fishers, non-governmental, and private sector agents perceived hydropower development to be the strongest factor driving fisheries decline or change over the past 10 years, while government staff perceived overfishing to be an equally or even more important factor. Most stakeholders affirmed that fisheries governance arrangements have weakened in the face of hydropower development, and that these arrangements have been insufficient to effectively mitigate or compensate for negative impacts on fisheries. Fishers, non-governmental and private sector agents saw lack of opportunities to participate in fisheries governance as a major contributing factor, while government staff emphasized lack of qualified personnel, lack of trust between agencies, and control over the decision-making process held by hydropower companies. Perspectives on other implications of governance arrangements were shared across stakeholder groups. These included increased conflicts; lack of interaction and coordination between agencies; the fragility of fishers’ social organization; lack of trust and reciprocity between organizations; and power imbalances between stakeholders. The results show that hydropower development impairs and changes relationships between diverse players involved in fisheries governance, which can exacerbate existing weaknesses and negatively affect fishery sustainability. Drawing from the perspectives and comments of the various stakeholders who participated in the study, we provide recommendations to improve freshwater fisheries governance in the Madeira River basin and in the Brazilian Amazon.

Assessing changes of carbon stock in dipterocarp forest due to hydro-electric dam construction in Malaysia.

Deforestation and forest degradation are among the leading global concerns, as they could reduce the carbon sink and sequestration potential of the forest. The impoundment of Kenyir River, Hulu Terengganu, Malaysia, in 1985 due to the development of hydropower station has created a large area of water bodies following clearance of forested land. This study assessed the loss of forest carbon due to these activities within the period of 37 years, between 1972 and 2019. The study area consisted of Kenyir Lake catchment area, which consisted mainly of forests and the great Kenyir Lake. Remote sensing datasets have been used in this analysis. Satellite images from Landsat 1-5 MSS and Landsat 8 OLI/TRIS that were acquired between the years 1972 and 2019 were used to classify land uses in the entire landscape of Kenyir Lake catchment. Support vector machine (SVM) was adapted to generate the land-use classification map in the study area. The results show that the total study area includes 278,179 ha and forest covers dominated the area for before and after the impoundment of Kenyir Lake. The assessed loss of carbon between the years 1972 and 2019 was around 8.6 million Mg C with an annual rate of 0.36%. The main single cause attributing to the forest loss was due to clearing of forest for hydro-electric dam construction. However, the remaining forests surrounding the study area are still able to sequester carbon at a considerable rate and thus balance the carbon dynamics within the landscapes. The results highlight that carbon sequestration scenario in Kenyir Lake catchment area shows the potential of the carbon sink in the study area are acceptable with only 17% reduction of sequestration ability. The landscape of the study area is considered as highly vegetated area despite changes due to dam construction.

Solutions proposed for socio‐environmental conflicts and concerning multiple‐use hydroelectric reservoirs in Brazil

AbstractHydropower reservoirs designed and/or operated to provide multiple services beyond power generation are called multiple‐use reservoirs. However, their construction has social and environmental impacts that require technical knowledge, social discussion, and acceptance by the public. The present paper analyzes the roles of the strategic environmental assessment and the hydroelectric inventory studies, as well as proposes alternatives for water distribution. The purpose of this study is to focus on the initial phases of hydropower planning, with the aid of the SHARE concept, in order to avoid future conflicts in the use of water resources. Although the instruments analyzed provide for the participation of different sectors, there is still little integration and alignment with sectoral policies (electrical and environmental) or there is no institutionalization of them, which makes this an urgent problem. The diagnosis resulting from this study is that the situation of multiple‐uses reservoirs in Brazil still deserves significant advances. As a proposal for improving the framework, this study claims that the use of integrated planning between sectors that use water resources should be improved by applying new concepts of integrated planning, such as the SHARE concept.

HYDROELECTRIC DAMS FROM MADEIRA RIVER SEASONALLY IMPACTS THE FISHERIES PRODUCTION IN THE GUAPORÉ BASIN (RONDÔNIA, BRAZIL)

In the Amazon region, fisheries play an important role in the socioeconomic and cultural context and are directly affected by changes in the hydrological cycle, which can interfere with the numbers and frequencyof fish species landed. This study analyzed the variation of fishery production against the seasonality of the water level of the Guaporé River (a tributary of the Madeira River) using information contained in the records of fishery landings in the area under study. In addition, two periods pre (2000 to 2008) and post (2009 to 2019) installation of the Jirau and Santo Antônio dams in the Madeira River were considered. Fish production in the period prior to damming indicated linearity (r2 = 0.41) which was inversely proportional to the water levels of the Guaporé River, with low fish production in the flood and high production during the low water phases. However, for the period after damming, these variables showed low correlation (r2 = 0.14). Among the fish species exploited, 35.13% presented significant differences (p <0.05) between the production values for the periods before and after installation of the dams. Therefore, the results showed significant differences between the values of fishery production by species and phases of the hydrological cycle of the Guaporé River, which occurred in the periods pre and post damming of the Madeira River, which indicates that the hydroelectric dams have negatively impacted the fish stocks of this region. The information contained in this study is useful and serves as a basis for coherent decision-making, since it aids in the sustainable management and monitoring of fish stocks in the Madeira River Basin.

Low Diffusive Methane Emissions From the Main Channel of a Large Amazonian Run-of-the-River Reservoir Attributed to High Methane Oxidation

The global development of hydropower dams has rapidly expanded over the last several decades and has spread to historically non-impounded systems such as the Amazon River’s main low land tributaries in Brazil. Despite the recognized significance of reservoirs to the global methane (CH4) emission, the processes controlling this emission remain poorly understood, especially in Tropical reservoirs. Here we evaluate CH4 dynamics in the main channel and downstream of the Santo Antônio hydroelectric reservoir, a large tropical run-of-the-river (ROR) reservoir in Amazonia. This study is intended to give a snapshot of the CH4 dynamics during the falling water season at the initial stage after the start of operations. Our results show substantial and higher CH4 production in reservoirs’ littoral sediment than in the naturally flooded areas downstream of the dam. Despite the large production in the reservoir or naturally flooded areas, high CH4 oxidation in the main channel keep the concentration and fluxes of CH4 in the main channel low. Similar CH4 concentrations in the reservoir and downstream close to the dam suggest negligible degassing at the dam, but stable isotopic evidence indicates the presence of a less oxidized pool of CH4 after the dam. ROR reservoirs are designed to disturb the natural river flow dynamics less than traditional reservoirs. If enough mixing and oxygenation remain throughout the reservoir’s water column, naturally high CH4 oxidation rates can also remain and limit the diffusive CH4 emissions from the main channel. Nevertheless, it is important to highlight that our results focused on emissions in the deep and oxygenated main channel. High emissions, mainly through ebullition, may occur in the vast and shallow areas represented by bays and tributaries. However, detailed assessments are still required to understand the impacts of this reservoir on the annual emissions of CH4.

Slope stability analysis of landslide zones in the part of Himalaya, Chamba, Himachal Pradesh, India

The current study is related to the slope stability assessment along a part of pilgrimage route (NH-154A) connecting a holy shrines of Bharmour and Manimahesh. This road section also connects with hydroelectric dams and power stations through a tunnel. The recognition of the soil slopes has been done along the road corridor, thereafter, topographical and geotechnical based investigations were carried out along the failed soil slope sections. The soil samples were collected from each selected site for geotechnical studies. In general, the slopes with an inclination angles varying from 40°—80° were identified in the study area. Using circular failure charts (CFC), the factor of safety values were obtained based on the requisite parameters of the slope. The current study will be helpful for mitigating unstable slopes along the highway stretch. The slope steepness, proximity to river Ravi, rainfall, and human disturbance due to road widening are major triggering factors for slope instability along NH-154A.

Flood Pulsing in Restoration : A Feasible Alternative for India?

The full restoration of natural flood pulsed conditions has only been attempted in a few places in the world because the politics behind the original destruction of the wetland generally impedes full restoration. Often the desire to restore wetlands for wildlife and other purposes is not strong enough to alter or eliminate the engineering projects such as embankment, diversion, interbasin water transfer and hydroelectric dams for water, irrigation and electricity that destroyed the original wetland. Unfortunately, we must find ways to provide plant and animal species flood pulsed habitats because many of these are not only adapted to, but dependent on this environment for their continued survival.The restoration of flood pulsing has been accomplished only in a handful of places such as the Kissimmee River (Florida U.S.A.) and the Lodi Wildlife Area (Wisconsin U.S.A.). At the same time, many partial restorations have been successful removing or working with engineering projects. After the floods of the Mississippi River (U.S.A.), many people moved off the flood plain with the blessing of the Federal Emergency Management Agency. Now, several embankments (levees or bunds) have been removed, and areas are reverting to natural vegetation. Downstream from hydroelectric dams in the Cameroon (Africa) and near Pune (India), impounded borrow areas with bunds have created fisheries/vegetable gardens and wildlife habitat, respectively. Restoration of spring habitats in arid and montane regions can be as simple as removing cattle from the banks of streams as in the case of the Magic Spring near Cartago (Costa Rica). The inclusion of flood pulsing in riverine restoration in India is a new idea as it is everywhere, but we must give serious consideration to recreating the original conditions of the habitat for the benefit of the animals and plants that utilize these wetlands.

The species composition of rotifers in three hydroelectric reservoirs of western highlands, Central Vietnam

The rotifer fauna in three hydroelectric reservoirs of western highlands, central Vietnam were studied. Among a total of 63 identified species and subspecies, beloging to 23 genera in 15 families, Brachionidae was the most diverse family with 15 taxa recorded (23.81%) followed by Lecanidae (14 taxa, 22.22%), and Synchaetidae (8 taxa, 12.7%). Species accumulation curve and species richness estimators suggested a relatively high level of biodiversity of rotifera assemblages in the studied area. Besides, results on species composition of rotifera community in this study were compared to those of other freshwater bodies in Vietnam using Jaccard similarity index. In particular, the highest similarity was found between reservoirs in western highlands and Phu Ninh lake, Quang Nam Province while the largest difference in species composition was observed between western highlands and Bau Thiem lake, Thua Thien Hue Province.

Salmon Versus Power: Dam Removal and Power Supply Adequacy

Dam removal is gaining both support and resistance in different communities and political circles in the Pacific Northwest of the United States, given its sensitive environmental and economic consequences. The Columbia River Basin (CRB) offers a unique opportunity to examine to what extent the replacement of hydroelectric dams affects reliability and adequacy of the power system given long-standing proposals to remove the four Lower Snake River dams to improve the survival of the endangered salmon species. Key results show that replacing the four dams leads to an inadequate energy supply, necessitating the need for more capacity to satisfy requirements. Although the four dams have higher nameplate capacity, they provide a much lower effective capacity. Thus, the debate about removing dams should be an opportunity for CRB managers to consider investment options in new ecosystem services and energy solutions that maintain adequate performance.

Conservation of migratory fishes in the Amazon basin

Abstract The Amazon basin hosts the Earth's highest diversity of freshwater fish. Fish species have adapted to the basin's size and seasonal dynamics by displaying a broad range of migratory behaviour, but they are under increasing threats; however, no study to date has assessed threats and conservation of Amazonian migratory fishes. Here, the available knowledge on the diversity of migratory behaviour in Amazonian fishes is synthesized, including the geographical scales at which they occur, their drivers and timing, and life stage at which they are performed. Migratory fishes are integral components of Amazonian society. They contribute about 93% (range 77–99%) of the fisheries landings in the basin, amounting to ~US$436 million annually. These valuable fish populations are mainly threatened by growing trends of overexploitation, deforestation, climate change, and hydroelectric dam development. Most Amazonian migratory fish have key ecological roles as apex predators, ecological engineers, or seed‐dispersal species. Reducing their population sizes could induce cascading effects with implications for ecosystem stability and associated services. Conserving Amazonian migratory fishes requires a broad portfolio of research, management, and conservation actions, within an ecosystem‐based management framework at the basin scale. This would require trans‐frontier coordination and recognition of the crucial importance of freshwater ecosystems and their connectivity. Existing areas where fishing is allowed could be coupled with a chain of freshwater protected areas. Management of commercial and subsistence species also needs fisheries activities to be monitored in the Amazonian cities and in the floodplain communities to allow assessments of the status of target species, and the identification of management units or stocks. Ensuring that existing and future fisheries management rules are effective implies the voluntary participation of fishers, which can be achieved by increasing the effectiveness and coverage of adaptive community‐based management schemes.

Microbial Diversity and Mercury Methylation Activity in Periphytic Biofilms at a Run-of-River Hydroelectric Dam and Constructed Wetlands.

ABSTRACTPeriphytic biofilms have the potential to greatly influence the microbial production of the neurotoxicant monomethylmercury in freshwaters although few studies have simultaneously assessed periphyton mercury methylation and demethylation rates and the microbial communities associated with these transformations. We performed a field study on periphyton from a river affected by run-of-river power plants and artificial wetlands in a boreal landscape (Québec, Canada). In situ incubations were performed on three sites using environmental concentrations of isotopically enriched monomethylmercury (MM198Hg) and inorganic mercury (200Hg) for demethylation and methylation rate measurements. Periphytic microbial communities were investigated through 16S rRNA gene analyses and metagenomic screenings for the hgcA gene, involved in mercury methylation. Positive mercury methylation rates ([5.9 ± 3.4] × 10−3 day−1) were observed only in the wetlands, and demethylation rates averaged 1.78 ± 0.21 day−1 for the three studied sites. The 16S rRNA gene analyses revealed Proteobacteria as the most abundant phylum across all sites (36.3% ± 1.4%), from which families associated with mercury methylation were mostly found in the wetland site. Metagenome screening for HgcA identified 24 different hgcA sequences in the constructed wetland site only, associated with 8 known families, where the iron-reducing Geobacteraceae were the most abundant. This work brings new information on mercury methylation in periphyton from habitats of impacted rivers, associating it mostly with putative iron-reducing bacteria.IMPORTANCE Monomethylmercury (MMHg) is a biomagnifiable neurotoxin of global concern with risks to human health mostly associated with fish consumption. Hydroelectric reservoirs are known to be sources of MMHg many years after their impoundment. Little is known, however, on run-of-river dams flooding smaller terrestrial areas, although their numbers are expected to increase considerably worldwide in decades to come. Production of MMHg is associated mostly with anaerobic processes, but Hg methylation has been shown to occur in periphytic biofilms located in oxic zones of the water column. Therefore, in this study, we investigated in situ production of MMHg by periphytic communities in habitats impacted by the construction of a run-of-river dam by combining transformation rate measurements with genomic approaches targeting hgcAB genes, responsible for mercury methylation. These results provide extended knowledge on mercury methylators in river ecosystems impacted by run-of-river dams in temperate habitats.

Analysis of Changes in the Quality of Surface Water after Filling of Hydroelectric Reservoirs in the Amazon, Brazil

We employed statistical techniques to assess the quality of surface water measured before and after filling the reservoirs of four important hydroelectric power plants (HPPs) established in the Brazilian Amazon (Belo Monte, Jirau, Teles Pires, and Santo Antonio do Jari). A cluster analysis efficiently identified distinctions between the dendrograms obtained for the pre- and post-filling phases in the four projects and indicated changes in water quality after the reservoirs were filled. The Mann-Whitney U test (at the 5% significance level) allowed for the identification of parameters that exhibited significant changes after filling the reservoirs. Across the four HPPs, a total of 45 monitoring points and 54 water quality parameters were analyzed. The results revealed 14 parameters that changed significantly at a greater number of monitoring points in more than one HPP, namely water temperature, pH, dissolved oxygen, electrical conductivity, oxidation-reduction potential, transparency, total dissolved solids, chlorophyll-α, thermotolerant coliforms, alkalinity, total phosphorus, and calcium, sulfate, and sulfide ion concentrations. These parameters were identified as the most important for explaining the changes in water quality after filling the reservoirs. All monitoring points located within the reservoirs (41 points) and immediately downstream of the dams (4 points) revealed significant changes in water quality. Thus, changes in the quality of surface water were observed along the entire lengths of the reservoirs, including the initial stretches. This study contributes to the understanding of the temporal and spatial effects of the formation of reservoirs on surface water quality parameters.

Governança ambiental em construções de hidrelétricas

As hidrelétricas, que foi uma grande solução no passado para o desenvolvimento mundial, hoje é motivo de polêmicas em relação aos conflitos provocados nos diversos recursos do ecossistema global. O papel dos diferentes steakholders nem sempre é desempenhado como se espera de uma governança ambiental. Diante desse impasse é que se propôs este estudo com o objetivo de identificar quais os mecanismos de governança ambiental presentes nas construções de usinas hidrelétricas. Para a construção do artigo utilizou-se de análise sistemática de revisão, cuja busca utilizada para os artigos foi a base de dados Scopus, dos quais foram selecionados estudos relacionados a conflitos entre os recursos oriundos das construções de hidrelétricas em vários países. Dentre os diversos mecanismos da governança ambiental, observou-se em alguns países, como Brasil, Polônia, África e Indonésia, a existência de legislações na tentativa de solucionar tais impasses. No entanto, as ações não se constituem somente de normas, mas, também, verificou-se outros mecanismos como a participação de diversos atores internos e externos que direta ou indiretamente são afetados por esses tipos de projetos.

Phylogenetic and morphological study of the genus Potamolithus (Truncatelloidea: Tateidae) in hotspots of diversity at the Paranaense Forest, Argentina, with the addition of six new species

The Atlantic Forest is a highly fragmented biodiversity hotspot, which in Argentina is represented by the Paranaense Forest, covering a wide area of the province of Misiones. In conservation studies, groups of vertebrates, plants and arthropods are generally used together but other invertebrates scarcely used. In the present work, we aim to provide information on new species of freshwater gastropods, from protected and unprotected areas. Specimens were collected in a protected area (Yabotí Biosphere Reserve) and in two unprotected areas (Alba Posse city and Centro de Investigaciones Antonia Ramos -CIAR-). The shell, radula, internal anatomy and the molecular information of the partial sequence of mitochondrial cytochrome c oxidase subunit I (COI) were analysed. The phylogenetic trees were obtained using Maximum Likelihood and Bayesian Inference analyses. Altogether, the anatomical, shell, and genetic studies allow us to differentiate six new species of the genus Potamolithus from the others present in Argentina and the surrounding areas. These new species raise the number of freshwater gastropods for the malacological province Río Uruguay to 64. Three of the new species have been found within a protected area, while other three at unprotected areas. The presence of invasive species, such as Limnoperna fortunei (Dunker 1857) and Melanoides tuberculata (Müller, 1774), as well as the possible creation of a hydroelectric dam, may modify the environment inhabited by the new endemic fauna.

Generalized storage-reliability-yield framework for hydroelectric reservoirs

ABSTRACT Although storage-reliability-yield (SRY) relationships have been widely used in the design and planning of water supply reservoirs, their application in hydroelectricity is practically nil. Here, we revisit the SRY analysis and seek its generic configuration for hydroelectric reservoirs, following a stochastic simulation approach. After defining key concepts and tools of conventional SRY studies, we adapt them for hydropower systems, which are subject to several peculiarities. We illustrate that under some reasonable assumptions, the problem can be substantially simplified. Major innovations are the storage-head-energy conversion via the use of a sole parameter, representing the reservoir geometry, and the development of an empirical statistical metric expressing the reservoir performance on the basis of the simulated energy-probability curve. The proposed framework is applied to numerous hypothetical reservoirs at three river sites in Greece, using monthly synthetic inflow data, to provide empirical expressions of reliable energy as a function of reservoir storage and geometry.

Spatio-temporal analysis of land use/land cover change through overlay technique in Kinnaur district of Himachal pradesh, Western Himalaya

In the modern era of globalisation demand of natural resources is very high for the well-being of human; high demand results in the degradation of natural resources, uneven pattern of development and changes in naturally available resources. Changes in land use land cover (LULC) is a dynamic process, which varies with time and space. It is the main component in the planning and management of natural resources, and analysing the changes in the environment. There are many remote sensing and GIS-based model used by the researcher in the world to identify the land use pattern. Here, Digital change detection model is used to determine the changes in Land use and Land cover with geo-referenced multi-temporal remote sensing data. This present study is an attempt to identify the spatial-temporal variation of LULC in the Kinnaur district of Himachal Pradesh, based on the secondary data. Landsat imageries are collected from the United States Geological Survey (USGS) for a different period like Landsat TM, Landsat ETM +, and Landsat OLI. Kinnaur district has witnessed many hydro-electric power projects, dam, tunnel and road construction, which has changed the pattern of land use in a few decades. It is indispensable to have a sustainable development mechanism for the fragile ecosystem. It includes the initiative of local government and Corporate Social Responsibility (CSR), government agencies and global partners to improve the degraded land condition.Keywords: Natural Resources, Land Use/ Land Cover, Kinnaur, Hydro-electric Power Projects.

Prediction of water erosion in a watershed located in southeastern Brazil

Water erosion modeling is a fast and accurate way to estimate erosion potential in watersheds. Among the models, we have the Revised Universal Soil Loss Equation (RUSLE) which has a simple structure, low implementation cost and can be used with readily available information, contributing to the planning of soil conservation practices. In this context, the objective of the work was to apply RUSLE to estimate water erosion in the Córrego da Laje watershed affluent directly from the reservoir of the Furnas Hydroelectric Plant, located in the south of Minas Gerais, a region of southeastern Brazil. In this region, water erosion is a serious problem that has caused the silting up of the hydroelectric reservoir and the depreciation of water quality. Soil losses were calculated in Geographic Information System based on topographic, edaphoclimatic characteristics, soil cover, and management practices. The average soil loss of the watershed was 26.80 Mg ha-1 year-1 with the predominance of highintensity erosive rates (> 15 Mg ha-1 year-1). Considering the basin use classes, sediment generation was higher in pasture areas (35.87 Mg ha-1 year-1), and in areas under maize cultivation (32.05 Mg ha-1 year-1). As areas with severe erosion are distributed throughout the watershed, a comprehensive water erosion mitigation plan should be adopted to reduce the environmental damage of the process.

Indigenous paradiplomacy and the Orokawe hydroelectric dam on the Kunene River

English Abstract: What role can non-diplomats play in managing and altering power relations in transboundary river basins? We answer this by investigating the lobbying efforts of indigenous peoples to stop the construction of the planned Orokawe (Baynes) dam on the Kunene River. The Kunene River forms part of the border between Angola and Namibia with several concluded treaties in place. These treaties set the context of bilateral state diplomacy concerning the allocation and management of a transboundary water resource. The theoretical foundation of our investigation are ideational power conceptualizations and practice theory. We discuss the employment of ideational power in transboundary rivers with numerous practices, such as lobbying and transnational network development. This article argues that actors consciously practice power during transboundary water diplomacy.Spanish Abstract: ¿Qué papel desempeñan los no-diplomáticos en la gestión y modificación de las relaciones de poder en las cuencas fluviales transfronterizas? Respondemos investigando los esfuerzos de cabildeo de los pueblos indígenas para detener la construcción de la presa Orokawe (Baynes) en el río Kunene, entre Angola y Namibia. La asignación y gestión de este recurso hídrico transfronterizo, cuenta con varios tratados concluidos que establecen el contexto de la diplomacia estatal bilateral. La base teórica de esta investigación son las conceptualizaciones del poder ideacional y la “teoría de la práctica”. El empleo del poder ideacional en ríos transfronterizos se refleja en prácticas como el cabildeo y el desarrollo de redes ransnacionales. Este artículo sostiene que los actores practican conscientemente este poder durante la diplomacia del agua transfronteriza.French Abstract: Quel rôle les non-diplomates peuvent-ils jouer dans la gestion et la modification des relations de pouvoir dans les bassins fluviaux transfrontaliers? Nous répondons à certe question en enquêtant sur les efforts de lobbying des peuples autochtones pour arrêter la construction du projet du barrage d’Orokawe (Baynes) sur le fleuve Kunene. Le Kunene forme une partie de la frontière entre l’Angola et la Namibie, pays entre lesquels plusieurs traités sont en vigueur. Ces traités définissent le contexte de la diplomatie bilatérale des États concernant le partage et la gestion de la ressource en eau transfrontalière. Les fondements théoriques de notre enquête reposent sur les conceptualisations du pouvoir idéationnel et la théorie de la pratique. L’article aborde les nombreuses pratiques du pouvoir idéationnel dans les cours d’eau transfrontaliers, telles que le lobbying et le développement de réseaux transnationaux. Il soutient que les acteurs exercent consciemment le pouvoir dans le cadre de la diplomatie transfrontalière de l’eau.

Analysis of Water Quality in Layer Cage with Aquaponic System in PLTA Koto Panjang Container, Kampar District

Aquaponies is one way to reduce water pollution produced by fish fanning, it can also be an alternative to reduce the amount of water used in the aquaculture system. Water quality is an important factor in fish fanning activities because it can affect the growth and development of fish cultivated in reservoir waters. The purpose of this study was to analyze the water quality of the KJA (floating net cages) layered with the aquaponic system tested in the waters of the Koto Panjang Hydroelectric Reservoir. Tins research was conducted in June - August 2020 at the Koto Panjang Hydroelectnc Reservoir. Measurement of water quality parameters is earned out directly at the research location. The analysis of the physical and chemical parameters of the waters is measured in the laboratory and the calculation of the water quality parameters refers to the APHA-AWWA and is compared with Government Regulation Number 82 of 2001 concerning Class II water quality standards. Based on the results of observations on water quality in layered cages with the aquaponies system, it is known that temperature parameters range from 31-33°C. pH ranges from 5-6. dissolved oxygen ranges from 9.38 - 9.65 mg / L. free carbon dioxide ranges from 9.14 - 11, 12 mg / L and brightness range from 148.9 to 156.2 cm. Meanwhile, nitrate parameters ranged from 0.03-0.04 mg L and phosphates ranged from 0.30 to 0.06 mg L. The water quality in the layered marine cage in the aquaponies system in the Koto Panjang Hydroelectric Reservoir has been able to reduce nitrate and phosphate content so that it can reduce the impact of organic pollution that occurs in the waters of the Koto Panjang Hydroelectric Reservoir.