Reservoir operation under variable climate: Case of Rozva Dam, Zimbabwe

Ncube, Silenkosi; Makurira, Hodson; Kaseke, Evans; Mhizha, Alexander

doi:10.1016/j.pce.2011.07.059

Cited by 15 publications

(8 citation statements)

References 5 publications

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“…É preciso cautela, no entanto, para diferenciar mudança de variabilidade climática (NCUBE et al, 2011), sendo essa última caracterizada por episódios cíclicos naturais de variação dos atributos climáticos. No caso da região do reservatório de Itupararanga, não existe evidência de alterações significativas nos padrões de precipitação que caracterizem mudanças climáticas, mas sim uma dinâmica sazonal das chuvas, com intensidades e distribuições variadas nos diferentes meses do ano.…”

Section: Caracterização Geral Das Estações E Períodos De Amostragemunclassified

Heterogeneidade espacial e variabilidade temporal do reservatório de Itupararanga: uma contribuição ao manejo sustentável dos recursos hídricos da bacia do rio Sorocaba (SP)

Cunha¹

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"A palavra é o meu meio de comunicação. Eu só poderia amá-la. Eu jogo com elas como se lançam dados: acaso e fatalidade. A palavra é tão forte que atravessa a barreira do som. Cada palavra é uma ideia. Cada palavra materializa o espírito.Quanto mais palavras eu conheço, mais sou capaz de pensar o meu sentimento. Devemos modelar nossas palavras até se tornarem o mais fino invólucro dos nossos pensamentos." Clarice LispectorDedico esta tese a todos os meus familiares e à Juliana, que nunca questionaram o mérito dos meus sonhos e sempre me incentivaram a buscá-los com perseverança, ainda que isso implique, em alguns momentos, abdicação de precioso tempo ao lado deles. AGRADECIMENTOSA gratidão é um dos mais nobres sentimentos humanos, pois representa o reconhecimento da importância da colaboração de outras pessoas para a realização das atividades cotidianas e a superação de desafios. Ninguém é o que é, ou conquista o que conquista, por merecimento exclusivo, mas sim por mérito compartilhado com outros indivíduos -que são os verdadeiros amigos, na mais genuína acepção da palavra. Por isso, tenho a oportunidade, neste momento, de expressar meus sinceros agradecimentos a pessoas que surgiram na minha vida, ao acaso ou não, há muito tempo ou recentemente, e com as quais tenho a satisfação de conviver.À Profª Maria do Carmo Calijuri, grande exemplo profissional, pela verdadeira amizade construída desde 2004, ano em que comecei a desenvolver projeto de iniciação científica, sob sua orientação, quando ainda cursava o primeiro ano de graduação em Engenharia Ambiental na EESC-USP. Pela força e confiança sempre transmitidas, pelo apoio incondicional, pela dedicação, pelo acolhimento, pelas longas e agradáveis conversas sobre a profissão e sobre a vida e pela oportunidade única de aprendizado e formação, deixo aqui registradas a minha admiração e a minha sincera gratidão. Tenha certeza que a amizade, o respeito e a cumplicidade serão eternos. , revealed the meso-eutrophic condition of the reservoir. The phytoplankton community structure and the high abundance of Chlorophyceae and Cyanobacteria as the dominant groups, especially the species Cylindrospermopsis raciborskii and Monoraphidium contortum, were associated with the possible co-limitation by nutrients and light availability in different spatial compartments of the reservoir, the hydraulic retention time, the circulation patterns within the water column and the interaction with zooplankton and macrophytes. The tributary rivers (Una, Sorocabuçu Sorocamirim) were recognized as point sources of pollution and as the main drivers of water quality degradation in the reservoir. Smaller relative importance was attributed to the diffuse sources (agricultural runoff). In order to aid in the local water resources management, the following topics were discussed: the role of the reservoir for retention or exportation of solids and nutrients, the water quality frequency curves and the proposal of a new Trophic State Index for subtropical reservoirs, the TSI sr .

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Section: Caracterização Geral Das Estações E Períodos De Amostragemunclassified

Heterogeneidade espacial e variabilidade temporal do reservatório de Itupararanga: uma contribuição ao manejo sustentável dos recursos hídricos da bacia do rio Sorocaba (SP)

Cunha¹

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“…After the simulation of scenarios of climate change and water demand increasing in the Rozva reservoir, in Zimbabwe, Ncube et al (2011) have concluded that the decision makers should anticipate the consequences of the impacts. Ward et al (2013) have proposed the application of the dynamic management in the Angat Dam in Philippines.…”

Section: Simulation Of An Alternative Operation Rulementioning

confidence: 99%

Water Supply Reservoir Operation in Relation to Climate Variability: Pirapama River Basin (Pernambuco-Brazil)

Bacalhau¹,

Neto²,

Montenegro³

2017

J. Urb. and Environ. Engng

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Abstract:The vulnerability of water resources systems is highly influenced by the climate variability of the region. The effects are amplified when the region has high population density and important economic activities such as the Recife Metropolitan Region (RMR), whose population is 3.8 million inhabitants, corresponding to 51% of the urban population in Pernambuco State. The Pirapama reservoir was designed to produce 5.6 m³/s, which corresponds to 37% of the total water demand of the RMR. The objective of the paper is to define strategies for the Pirapama reservoir operation by using guide curves and taking into account the climate variability, particularly drought events, to minimize or even avoid the conditions of rationing and collapse of its storage. The rainfall-runoff model SMAP was used to simulate input streamflow in the period 1933−2014 and the water allocation model Acquanet was used to simulate the operation rules proposed. The guide curves were defined based on the Standard Runoff Index, which classify the input inflow in drought categories. For each drought category, a response goal was defined for withdrawal reduction. This strategy may be an efficient tool to deal with the climate variability present in Northeast Brazil, which can be amplified with the effects of the climate change. In this sense, the development of sustainable operation rules can be considered an adaptation measure for reducing the impacts of possible climate changes in the future.

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“…Governments in some countries for example Tanzania and South Africa have also gone a step further in decentralizing irrigation management by promoting farmer managed irrigation schemes so as to ensure effective management of community based land and water resources (van Koppen et al, 2004;Mudau, 2010). Irrigation is viewed as a mechanism for reducing the impact of climate change and climate variability (IPCC, 2007;Ncube et al, 2011;Chikozho, 2010;de Hamer et al, 2008;Love et al, 2006;Van der Zaag et al, 2010).…”

Section: Decentralizationmentioning

confidence: 99%

Decentralising Zimbabwe’s water management: The case of Guyu-Chelesa irrigation scheme

Tambudzai

Mapedza

Zhou

2013

Physics and Chemistry of the Earth, Parts A/B/C

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a b s t r a c tSmallholder irrigation schemes are largely supply driven such that they exclude the beneficiaries on the management decisions and the choice of the irrigation schemes that would best suit their local needs. It is against this background that the decentralisation framework and the Dublin Principles on Integrated Water Resource Management (IWRM) emphasise the need for a participatory approach to water management. The Zimbabwean government has gone a step further in decentralising the management of irrigation schemes, that is promoting farmer managed irrigation schemes so as to ensure effective management of scarce community based land and water resources. The study set to investigate the way in which the Guyu-Chelesa irrigation scheme is managed with specific emphasis on the role of the Irrigation Management Committee (IMC), the level of accountability and the powers devolved to the IMC. Merrey's 2008 critique of IWRM also informs this study which views irrigation as going beyond infrastructure by looking at how institutions and decision making processes play out at various levels including at the irrigation scheme level. The study was positioned on the hypothesis that 'decentralised or autonomous irrigation management enhances the sustainability and effectiveness of irrigation schemes'. To validate or falsify the stated hypothesis, data was gathered using desk research in the form of reviewing articles, documents from within the scheme and field research in the form of questionnaire surveys, key informant interviews and field observation. The Statistical Package for Social Sciences was used to analyse data quantitatively, whilst content analysis was utilised to analyse qualitative data whereby data was analysed thematically. Comparative analysis was carried out as Guyu-Chelesa irrigation scheme was compared with other smallholder irrigation scheme's experiences within Zimbabwe and the Sub Saharan African region at large. The findings were that whilst the scheme is a model of a decentralised entity whose importance lies at improving food security and employment creation within the community, it falls short in representing a downwardly accountable decentralised irrigation scheme. The scheme is faced with various challenges which include its operation which is below capacity utilisation, absence of specialised technical human personnel to address infrastructural breakdowns, uneven distribution of water pressure, incapacitated Irrigation Management Committee (IMC), absence of a locally legitimate constitution, compromised beneficiary participation and unclear lines of communication between various institutions involved in water management. Understanding decentralization is important since one of the key tenets of IWRM is stakeholder participation which the decentralization framework interrogates.

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Reservoir operation under variable climate: Case of Rozva Dam, Zimbabwe

Cited by 15 publications

References 5 publications

Heterogeneidade espacial e variabilidade temporal do reservatório de Itupararanga: uma contribuição ao manejo sustentável dos recursos hídricos da bacia do rio Sorocaba (SP)

Heterogeneidade espacial e variabilidade temporal do reservatório de Itupararanga: uma contribuição ao manejo sustentável dos recursos hídricos da bacia do rio Sorocaba (SP)

Water Supply Reservoir Operation in Relation to Climate Variability: Pirapama River Basin (Pernambuco-Brazil)

Decentralising Zimbabwe’s water management: The case of Guyu-Chelesa irrigation scheme

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