scholarly journals STUDY ON METHODS OF DETERMINATION OF AN ECOLOGICAL FLOW FOR THE MANAGEMENT OF WATER RESOURCES OF THE RIVER BASIN ON MARACAÇUMÉ RIVER

2018 ◽  
Vol 15 (30) ◽  
pp. 27-34
Author(s):  
L. S. ROSA JUNIOR ◽  
H. S. ALMEIDA ◽  
S. C. S. A. BRASIL ◽  
A. B. P. DE MORAIS ◽  
J. B. SARAIVA ◽  
...  
Keyword(s):  
Water Resources ◽  
River Basin ◽  
Water Availability ◽  
Sustainable Management ◽  
Flow Regimes ◽  
Maximum Percentage ◽  
Ecological Flow ◽  
Tennant Method

The elaboration of a study on methods for the determination of ecological flow for the management of the water resources of the Maracaçumé River Basin is very important for the proposed use and conservation of these resources insofar as the uses of water, especially the advisory uses, have changed the flow regimes and the existing water availability. In this context, this work aims to discuss about the applicability of hydrological methods that help in the correct and sustainable management of the water resources. In this way, were applied theQ7,10 Method; the 90% and 95% Method, beyond the Tennant Method with ecological flow corresponding to 30% of the average annual flow. The main results obtained were the characterization of the Maracaçumé River Basin and the flow values obtained in each method (0.541 m3/s, 1,075 m3/s, 0,459 m3/s and 19,50 m3/s for the Q7,10; Q90%; Q95% and Tennant (30%) methods, respectively). The work indicates that for the management of water resources in the Maracaçumé river basin, the ecological flow obtained through the Q90 methodology should continue to be adopted, evaluating the possibility of adapting the maximum percentage of use.

scholarly journals METHODOLOGY FOR ECONOMIC EVALUATION OF WATER MANAGAMENT

2012 ◽  
Vol 1 (8) ◽  
Author(s):  
Mesud Adžemović ◽  
Mirjana Bartula ◽  
Jordan Aleksić
Keyword(s):  
Water Resources ◽  
Economic Analysis ◽  
River Basin ◽  
Water Status ◽  
Cost Benefit ◽  
Three Dimensions ◽  
Water Services ◽  
Cost Distribution ◽  
Basin Area

Economic analysis is the key requirement of EU Water Framework Directive. On a level of river basin area, economic analysis includes three dimensions: 1. economic characterization of water use: current and future projected economic importance of capacities and potentials of water resources; 2. program of measures for achieving good water status: cost-benefit analyses, cost efficiency analyses, cost scale and influence: and 3. water services price policies: evaluation of institutional alternatives for recovery of water services costs, including analysis of cost distribution. The analysis includes leveling of current and projected water resources data with costs and benefits of water services on the level of river basin area within local communities and integrated on sub-region level.

scholarly journals Implementation of the EU ecological flow policy in Italy with a focus on Sardinia

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Davide Moccia ◽  
Luca Salvadori ◽  
Simone Ferrari ◽  
Alessandra Carucci ◽  
Antonio Pusceddu
Keyword(s):  
River Basin ◽  
Experimental Studies ◽  
Ecological Status ◽  
Well Being ◽  
Human Beings ◽  
River Ecosystems ◽  
Ecological Flow ◽  
Management Plans ◽  
Italian Territory

River ecosystems are characterised by a naturally high level of hydrodynamic perturbations which create aquatic-terrestrial habitats indispensable for many species, as well as for the human beings' welfare. Environmental degradation and habitat loss caused by increasing anthropogenic pressures and global change affect freshwater aquatic ecosystems worldwide and have caused changes in water flow regimes and channels morphologies. These, in turn, decreased the natural flow capacity and reduced habitat availability, thus causing severe degradation of rivers' ecological integrity. The ecological flow (e-flow) is commonly intended as the quantity, timing, duration, frequency and quality of water flows required to sustain freshwater, estuarine and near‐shore ecosystems and the human livelihoods and well‐being. Maintaining the e-flow represents a potential tool for restoring and managing river ecosystems, to preserve the autochthonous living communities, along with environmental services and cultural/societal values. In the last decade, methods for the determination of the e-flow in European rivers moved from a simply hydrological approach towards establishing a linkage between the hydrological regime and the good ecological status (GES) of the water bodies, as identified by the European Water Framework Directive (WFD; 2000/60/EC). Each Member State is required to implement and integrate into the River Basin Management Plans (RBMP) a methodology for the determination of the e-flow, ensuring that rivers can achieve and maintain the GES. The competent river basin authorities have thus to ascertain whether national methodologies to can be applied to different river typologies and basin environment characteristics. In this context, we narratively review the e-flow assessments in the heterogeneous Italian territory, in particular on a water scant region such as Sardinia, by analysing laws, guidelines and focusing on study cases conducted with micro and meso-scale hydraulic-habitat approaches. In the sight of a more ecological-based application of national e-flow policy, we suggest that meso-habitat methods provide a valuable tool to overcome several limitations of current e-flow implementation in the Italian territory. However, to face future challenges, such as climate change adaptation, we stress the need for further experimental studies to update water management plans with greater attention for nature conservation.

Evaluation of effectiveness of the water management strategies with the focus on agricultural water use: A case study on Upper-Sakarya River Basin in Turkey

2020 ◽  
Author(s):  
Beyza Özel ◽  
Yasemin Demir ◽  
Oğuz Başkan ◽  
Emre Alp
Keyword(s):  
Land Use ◽  
Water Resources ◽  
River Basin ◽  
Water Availability ◽  
Irrigation Water ◽  
Cropping Pattern ◽  
Management Scenarios ◽  
Efficient Management ◽  
Sakarya River ◽  
Technical Measures

<p>Water, energy and food nexus is an integrated framework suggests that the security of one resource is inevitably linked to another’s. Water availability assures healthy food production whereas agriculture is the dominant user of global freshwater. Water stress due to population growth, climate change or malpractices threatens food security. Within the scope of water for food governance, the water efficiency of agricultural irrigation has to be improved to aid sustainable water and agricultural management. The study investigates water availability and withdrawals, evaluates water resources management scenarios in the agricultural sector in the Sakarya River Basin, Turkey’s third-largest river basin. Demand-oriented management scenarios propose a variety of technical measures which include improvements in irrigation technology, shifts in the cropping pattern and water-saving irrigation strategies. The effectiveness of scenarios was evaluated using the Water Evaluation and Planning (WEAP) system developed for the upper sub-basin where significant agricultural activities are held with approximately 1 million ha of total effective arable land. WEAP is an integrated water resources system modeling that operates based on the principle of water balance accounting. A climate data set of precipitation, temperature, relative humidity, and wind speed were applied across each sub-basin, partitioned into land-use classes. A one dimensional, two-bucket model for each land-use class transmits water as surface runoff, interflow, percolation, baseflow and evapotranspiration components. The model was calibrated and validated for observed streamflow, reservoir volume, and irrigation water amount. The mean annual precipitation and evapotranspiration in the upper sub-basin are 387 mm/a and 245 mm/a respectively. Agriculture is the dominant user of both surface water and groundwater resources and accounts for the %88 of total water withdrawals in the upper sub-basin. Impacts of agricultural management on irrigation water supply and flow dynamics of streamflow gauges were evaluated upon each measure. When compared to a historic baseline scenario, efficient management measures can save irrigation water up to %10 by shifting crop patterns from sunflower to safflower, %6 by establishing drip irrigation instead of sprinkler, %4 by applying deficient irrigation on cereal cultivated areas. Furthermore, mean streamflow increases by %8 in June where deficient irrigation strategy is practiced on cereals, by %9 in October where cropping pattern is shifted from sunflower to safflower. After a review of various technical measures related to the efficient management of water resources, the study concluded that sustainable agricultural development is possible by adapting conservative agricultural practices that assure water and food security.</p>

scholarly journals Characteristics and Adaptability Assessment of Commonly Used Ecological Flow Methods in Water Storage and Hydropower Projects, the Case of Chinese River Basins

Water ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 2035
Author(s):  
Lejun Ma ◽  
Huan Wang ◽  
Changjun Qi ◽  
Xinnan Zhang ◽  
Hanwen Zhang
Keyword(s):  
River Basin ◽  
Yellow River ◽  
Yangtze River Basin ◽  
Water Storage ◽  
Yellow River Basin ◽  
River Basins ◽  
Average Flow ◽  
Ecological Flow ◽  
Tennant Method ◽  
Rate Method

The construction and operation of water storage and hydropower projects affects the structure of water ecosystems of downstream rivers, and the establishment of ecological flow in rivers below the water storage and hydropower projects has significant impacts on maintaining the stability of river ecosystems. A database was established based on 2000–2017 environmental impact assessment (EIA) reports on water storage and hydropower projects in China and ecological flow (e-flow) methods, and the three widely used e-flow methods for water storage and hydropower projects in China were identified on the database. Furthermore, an ecological flow satisfaction degree model was used to evaluate the methods using long series of historical hydrological data from the hydrological stations in the Yellow River basin, the Yangtze River basin, and the Liao River basin. The results showed that hydrological methods are the type most often used for water storage and hydropower projects in China, including the Tennant method, the minimum monthly average flow with 90% guarantee rate method (Mm9M method), and the measured historical minimum daily average flow rate method (MDM method). However, the ecological flow methods selected are not significantly different among different basins, indicating that the selection of ecological flow methods is rather arbitrary, and adaptability analysis is not available. The results of the ecological flow satisfaction model showed that the Tennant method is not suitable for large river basins. The results of this study can provide technical support for establishment and management decisions surrounding ecological flow.

scholarly journals Altitudinal zonation of runoff in the Rasina River Basin

2013 ◽  
Vol 93 (2) ◽  
pp. 41-54
Author(s):  
Predrag Manojlovic ◽  
Milan Srejic ◽  
Ivan Djokic ◽  
Sanja Mustafic ◽  
Tanja Dobrosavljevic
Keyword(s):  
Spatial Distribution ◽  
Water Resources ◽  
River Basin ◽  
Sedimentary Rocks ◽  
Water Volume ◽  
Water Runoff ◽  
Total Water ◽  
Total Runoff ◽  
Basin Area

The Rasina River Basin is located on the territory of Central Serbia. The aim of this paper is to determine the amount and spatial distribution of water resources, that is, to establish the participation of altitudinal zones in the formation of the total runoff in the Rasina River Basin area upstream from the "Celije" reservoir. In terms of methodology, determination of water volume is based on four separated petrological-hydrological complexes. Average weighted specific runoff in a given territory is 9 l/s/km2. Metamorphites and magmatites are in the first place per participation in the total water runoff of 42.8 %. The second place belongs to sedimentary rocks that make 39.6 % of the total runoff . Unbound sediments participate in the total runoff value with 10.5 % and limestone with 7.1%.

scholarly journals Outorgas Superficiais na Sub-Bacia Hidrográfica do Rio São Domingos, Pinheiros/ES / Grant Suface at Hydrographic Sub-Basin River São Domingos, Pinheiros/ES

2018 ◽  
Vol 28 (52) ◽  
pp. 125
Author(s):  
Jonatha Liprandi Jaques ◽  
André Luiz Nascentes Coelho
Keyword(s):  
Water Resources ◽  
Water Resources Management ◽  
Water Availability ◽  
Sustainable Management ◽  
The State ◽  
Federal Law ◽  
Espírito Santo ◽  
Resources Management ◽  
Methodological Tool ◽  
Espirito Santo

<p>O aumento da demanda pelos recursos hídricos tem colaborado para um cenário de conflitos decorrentes do uso da água em diferentes espaços geográficos e que vêm crescendo gradualmente no Estado do Espírito Santo. A Política Nacional e Estadual de Recursos Hídricos, instituída pela Lei Federal n° 9.433/1997 e a Lei Estadual do Espírito Santo 10.179/2014, constituiu a outorga nas condições de disponibilidades hídricas, pois fornece o limite máximo permissível, por prazo determinado para todos os usuários outorgados. Sendo assim, a presente pesquisa tem como objetivo avaliar em detalhes os processos de outorgas e as denúncias de irregularidades relativas ao uso de recursos hídricos na sub-bacia hidrográfica do rio São Domingos, localizada no município de Pinheiros – ES. Empregando como instrumento metodológico o uso de sistemas de informações geográficas (SIGs), com o propósito de identificar os processos de outorgas e as áreas de conflitos. Os resultados demonstraram que o uso de irrigação é predominante no número de outorgas. Consta-se a grande importância de um manejo sustentável para o uso de irrigação.</p><p><strong>Palavras-chave</strong>: Gestão de Recursos Hídricos; Instrumento de Gestão de Recursos Hídricos; Disponibilidade Hídrica; Conflitos de Usos de Recursos Hídricos.</p><p><strong>Abstract         </strong></p><p>The increase in demand for water resources has contributed to a scenario of conflicts arising from the use of water in different geographic spaces and that have been growing gradually in the State of Espírito Santo. The Hydric Resources National and State Politian, created by the Federal Law number 9.433/1997 and the State Law number 10.179/2014, constitute the grant under the conditions of water availability, as it provides the maximum permissible limit for a fixed term for all the users granted. Thus, the present research aims to evaluate in detail the granting processes and complaints of irregularities related to the use of water resources in  the São Domingos river basin, located in the municipality of Pinheiros – ES. Using as a methodological tool the use of geographic information systems (GIS), with the purpose of identifying the granting processes and the areas of conflicts. The results show that the predominant use of water is to irrigation as presented by number of grant. It is the importance of sustainable management for the use of irrigation is high.</p><p><strong>Keywords</strong>: Hydric Resources Management; Water Resources Management Instrument; Water Availability; Conflicts of Uses of Water Resources.</p>

Study on Countermeasures System of Ecological Flow Guarantee in Weihe River Basin

2020 ◽  
Author(s):  
Xinhai Zhang
Keyword(s):  
Water Resources ◽  
River Basin ◽  
Cross Sections ◽  
Warning System ◽  
Base Flow ◽  
Water Withdrawal ◽  
Current Status ◽  
Ecological Flow ◽  
Weihe River ◽  
Weihe River Basin

&lt;p&gt;Ensuring the ecological flow of the Weihe River is a basic requirement for strengthening water resources management and ecological protection and restoration in Weihe River Basin and is of great significance for ensuring the safety of water resources and ecological safety in Weihe River Basin. This study selects three major control cross-sections of Beidao, Linjiacun, and Huaxian for ecological flow protection research. In this paper, the existing results of the main control cross-sections were summarized, the Tennant method and the most withered month average flow method were applied to analyze and calculate the ecological base flow. Then, the flow data from 1980 to 2016 are applied to analyze the degree of ecological flow guarantee. Based on the changes in the Weihe River runoff and the development of water resources, the rationality and accessibility of the ecological flow were demonstrated, and the ecological base flow indicators of Beidao, Linjiacun and Huaxian cross-sections were comprehensively determined to be 2m&lt;sup&gt;3&lt;/sup&gt;/s, 5m&lt;sup&gt;3&lt;/sup&gt;/s, and 12m&lt;sup&gt;3&lt;/sup&gt;/s, respectively. Furthermore, the current status of ecological security in the Weihe River Basin was analyzed in depth. It is clear that there were problems in the Weihe River Basin, such as strong water demand, the high pressure of water uses for life, production and ecology during dry years, difficult guarantee of ecological flow, incomplete ecological flow guarantee working mechanism, etc. Based on the analysis, the suggestions were proposed from the perspectives of enhancing the organization and leadership, intensifying the unified allocation of water resources in the Weihe River, strengthening the capacity of water regime monitoring, establishing an early warning system for ecological flow, strictly controlling water withdrawal, and reinforcing supervision and assessment. Then the countermeasure system of ecological flow guarantee was established.&lt;/p&gt;

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