Water resources management in Brazil
Withdrawals by sector 2000/2001
  • Domestic: 12%
  • Agriculture: 80%
  • Industry: 8%
Renewable water resources8,233 km3
Surface water produced internally5,418 km3
Groundwater recharge1,874 km3
Overlap shared by surface water and groundwater1,874 km3
Renewable water resources per capita43,028 m3/year
Wetland designated as Ramsar sites6.4 million ha
Hydropower generation81%

Water resources management is a key element of Brazil's strategy to promote sustainable growth and a more equitable and inclusive society. Brazil's achievements over the past 70 years have been closely linked to the development of hydraulic infrastructure for hydroelectric power generation and just recently to the development of irrigation infrastructure, especially in the Northeast region.

Two challenges in water resources management stand out for their enormous social impacts: (i) unreliable access to water with a strong adverse impact on the living and health standards of the rural populations in the Northeast where two million households, most in extreme poverty, live, and (ii) water pollution in and near large urban centers, which compromises poor populations' health, creates an environmental damage, and increases the cost of water treatment for downstream users.

Water management history and recent development

As in many other countries, water resources management in Brazil has historically relied upon heavy investment on hydraulic infrastructure. From building the first hydropower facility in 1901 until the mid-1970s, hydropower has been the main focus of water resources management. In 1934, after several modifications introduced to the first 1907 draft, the Water Code was approved. The Water Code was the first legislation for water resources management in Brazil, and was applied for more than 60 years.[1] The Water Code ensured the free use of any water for basic life necessities and permitted everyone to use any public water while complying with administrative regulations. Some of its provisions, such as the polluter pays principle, were introduced long before this principle became globally recognized as a good practice.

The intention of reforming Brazil's water resources management system began to shape during the 1970s when other water users challenged the priority given to hydropower. Different initiatives and institutions for water management were established by the Federal Government and states such as São Paulo and Ceara. The Constitutional reform of 1988 was the first step in the creation of a National Water Law, whose responsibility was given to the Federal Government. The reformed Constitution also established a distinction between federally controlled water, for rivers across state boundaries, and state-controlled water, for rivers and groundwater that remained completely within state boundaries. Based on this new responsibility, the states began to implement their own water resources management systems. São Paulo pioneered this process in 1991 (see Water management in the Metropolitan Region of São Paulo). Today 25 of Brazil's 26 states and the Federal District have adopted legislation to modernize water resource management (see States of Brazil).

After negotiating for six years, the Federal Government approved the 1997 National Water Law (No. 9433) aimed at incorporating modern water resources management principles and instruments into Brazil's water resources management system. A National Water Authority was created in 2000 aimed at implementing the National Water Law. Numerous local, regional, and national initiatives, public and private bodies, and technical, scientific, and professional associations also play a role in Brazil's water resources management system.[2]

Water resource base

Surface and ground water resources

Brazil has always been considered a country rich in water. It is estimated that about 12% of the world's surface water resources are located in the country. In 2007, per capita water availability reached 43,027 m3 per year, above the world average of 8,209 m3 per capita in the same year. However, this impressive average masks an extremely uneven distribution of water resources among regions.

Amazon River basin

The Amazon river basin alone, which covers 48% of the country's territory, accounts for 75% of Brazil's freshwater resources but has only 4% of its population. The most dramatic departure from abundance can be found in the Northeast region, which includes most of the country's semi-arid region. Accounting for 18% of Brazil's territory and about 28% of its population, the Northeast region has only 5% of the country's water resources and is subject to recurrent, severe droughts, harvest failures, and food shortages. With 73% of the country's population, 11% of its territory, and about 10% of its water resources, the Southeast is the heart of Brazil's industrial economy and also has the highest agricultural production[3]

Brazil has three river basins (the Amazon, Tocantins, and São Francisco), and two basin complexes, the Plata River which has three Brazilian sub-basins (Paraná, Upper Paraguay, and Uruguay), and the remaining rivers flowing into the Atlantic which are divided into several basins. The Amazon and the Tocantins-Araguaia basins in the north account for 56 percent of Brazil's total drainage area. The Amazon River, the world's largest river in volume of water and second longest after the Nile, is navigable by ocean steamers as far as Iquitos in Peru. The São Francisco River is the largest river entirely within Brazil, flowing for over 1,609 km northward before it turns eastward into the Atlantic. The last 277 km of the lower river is navigable for ocean-going ships. The Paraná-Paraguay river system drains the southwestern portion of the state of Minas Gerais. Brazil's two southernmost states partially drain into the Uruguay River which flows into the Plata River. The inflow of the Amazon to Brazil is 1.9 BCM per year, so that the total surface water resources in the country reach, on average, 8.2 BCM per year[4]

Basin Name Surface Area (1000 km2) Precipitation (mm/year) Evapotranspiration (mm/year)
Amazon Basin 3935 8735.7 4918.8
Tocantins-Araguaia 757 1256.6 884.2
North and Northeast 1029 1533.0 1239.6
San Francisco 634 580.7 490.7
East Atlantic 634 321.0 246.2
Parana-Paraguay 1245 2139.9 1656.7
Uruguay 178 278.9 148.1
Southeast Atlantic 224 312.3 176.7
TOTAL 8547 15158.1 9761.0

Source: FAO

The volume of stored groundwater in Brazil less than 1,000 m deep and with good quality for human uses is estimated at 112,000 km3, with highly variable extraction rates.[4] In Brazil, groundwater is used in rural areas for domestic water supply and irrigation on a moderate scale. Estimates indicate that approximately 300,000 wells are being used, and over 10,000 more are drilled every year. On a large scale, groundwater is beginning to be used in areas where the surface water sources are scarce, where they are heavily used, or where their use is problematic due to heavy water pollution (Central and Southern Brazil). [5]

Storage capacity and infrastructure

The varies by regions. The northeastern state of Ceará, with 7,227 dams, has a cumulative maximum storage capacity of 11 billion cubic meters. However, losses from surface evaporation are equivalent to a large part of the annual inflow to the reservoirs due to arid climate conditions and shallow reservoirs[6] The Amazon River is extremely wide for most of its length, so most of the dams are located on its tributaries. The Tucurui dam, located on the Tocantins River in the Northeastern region, has a capacity of 110 BCM and a generating capacity of 8,000 MW.[7]

Water quality

Sewage is a major cause of water pollution in Brazil, a major problem that undermines quality of life, health, and economic development in large metropolitan areas and has a disproportionate impact on the poor in the slums surrounding Brazil's largest cities. According to the 2000 National Survey of Sanitary Conditions (PNSB), less than 10% of the wastewater produced in urban areas is treated. The 2000 PNSB was the latest survey of water supply for human consumption and wastewater collection and treatment conducted nationwide.[5] Water quality management is also undertaken by the states, although the quality of their water monitoring systems and surveys varies widely. In 2006, only nine Brazilian states had water quality monitoring systems that were rated as excellent or very good; five had good or fair systems; and thirteen had weak systems.[8]

The southeastern State of São Paulo, with a monitoring system considered very good, registered in its latest study high microbiological indexes indicative of pollution from domestic sewage both upstream and downstream in the Bairro da Serra River and even higher rated from two its main tributary streams.[9]

Water resources management by sector

Water supply and sanitation

Main article: Water supply and sanitation in Brazil

Domestic consumption accounts for 21% of water withdrawals in Brazil. The water and sanitation sector in Brazil has proved to be resilient and resourceful, despite tremendous challenges and persistent inequalities in the sector. Much has been achieved in the past decades, including a sustained improvement in efficiency and access. Access to improved water supply increased from 93 % in 1990 to 90% in 2004, and access to improved sanitation increased from 71% to 75%.[10]

Irrigation and drainage

Main article: Irrigation in Brazil

About 61% of all water withdrawal in Brazil is used for irrigation, which is lower than the average water withdrawal for irrigation in Latin America, 71%. The irrigated area in 1998 was 2.8 million ha, which represents 5.7% of the cultivated area. The irrigation potential of Brazil is estimated at 29.3 million ha, including only areas where irrigation can be developed and excluding areas of high ecological value in the northern region (Amazonas and Tocantins basins). The Ineffective irrigation has generated salinization and drainage problems in 15,000 ha, mostly in the northeast (of a total irrigated area of 736,000 hectares), jeopardizing these lands' productivity.[4]


Panoramic view of the Itaipu Dam, with the spillways (closed at the time of the photo) on the left

Main article: Electricity sector in Brazil

Access to electricity has increased from fewer than 500 kilowatt hours (kW·h) per capita in 1970 to more than 2,000 kW·h per capita in 2000. These results have been achieved mainly through the development of hydropower, which currently accounts for 81% of Brazil's installed capacity (69 gigawatts out of a total of 79). [11]

Brazil also has the largest hydroelectric power plant in operation in the world, the Itaipú Dam which was built from 1975 to 1991, in a joint development on the Paraná River. Its 18 generating units add up to a total production capacity of 12,600 MW (megawatts) and a reliable output of 75 million MWh a year, providing 25% of the energy supply in Brazil and 78% in Paraguay (in 1995).[12]

Aquatic ecosystems

Brazil has more freshwater fish species than any other country on earth, with the world's largest river basin, the Amazon, and the world's largest tropical floodplain, the Pantanal. In the Amazon River alone, there are an estimated 2,000 species of fish, more than all in North America. [13]

Yellow-billed spoonbill

The Pantanal covers at least 140,000 square kilometers of land, over four times the size of the Florida Everglades in North America. There are an estimated 700 species of birds, including spoonbills, and 26 species of parrots, including the endangered hyacinth macaw. The Pantanal is also home to the capybara, the world's largest rodent. Fish thrive in this wetland environment (over 260 species have been noted). Illegal poaching, deforestation, overfishing, pollution from human sewage, agricultural pesticides, and metal pollutants are taking an increasing environmental toll on the area. [14]

In 2007, Brazil had identified nine sites that fulfill criteria for wetlands of international importance according to the Ramsar Convention, seven of which are mainland wetlands. They include three National Parks: one in the Pantanal (Parque Nacional do Pantanal Mato-Grossense); one in the Araguaia (Parque Nacional do Araguaia); and one in the Peixe Lagoon (Parque Nacional da Lagoa do Peixe); two Environmental Protection Areas in the State of Maranhão (Área de Proteção Ambiental da Baixada Maranhense and the Área de Proteção Ambiental das Reentrâncias Maranhenses); a Private Wetlands Reserve in the Pantanal (Reserva Particular do Patrimônio Natural SESC Pantanal); and the Mamirauá Sustainable Development Reserve (Reserva de Desenvolvimento Sustentável Mamirauá). [8]

In 2006, the Government of Brazil approved its first Freshwater Management Plan, assuring that aquatic biodiversity will be an important aspect of freshwater planning for the entire country. With this plan, Brazil's Government explicitly made biodiversity a part of the decision-making process for the use of the country's freshwater resources.[13]

Legal and institutional framework

International legal framework

Brazil has signed numerous treaties with neighboring countries, aimed at promoting sustainable use of shared water resources. The Treaty of the Rio de la Plata entered into force in 1977 and is working as a political interconnection among the countries of the Southern Cone (Argentina, Brazil, Bolivia, Paraguay, and Uruguay). Its main objectives are the sustainable use of water resources; regional development with preservation of flora and fauna; physical, fluvial, and terrestrial integration; and promotion of greater knowledge of the basin, its resources and potential.

The Amazon Cooperation Treaty (TCA) was signed in 1978 by Brazil, Colombia, Ecuador, Guyana, Peru, Suriname, and Venezuela and entered into force for Brazil in 1980. The basic scope of the TCA is to promote the harmonious development of the Amazon, in order to allow an equitable distribution of the benefits, to improve the quality of life of its peoples, and to achieve the full incorporation of their Amazon territories in their respective domestic economies.

Other treaties include: (i) the Cooperation Agreement for the Use of Natural Resources and Development of the Quaraí River Basin; and (ii) the Treaty for the Use of Shared Natural Resources of the Bordering Stretches of the Uruguay River and its tributary, the Pepiri-Guaçú River, between Brazil and Argentina.

National legal framework

The 1988 Constitution established a distinction between federally controlled water, for rivers, lakes, and lagoons across state boundaries (article 20), and state-controlled water, for rivers and groundwater that remain completely within state boundaries (article 26). This definition of state-controlled water complicates the effective management of some of the country's important rivers since the main stem of a federally controlled river cannot be effectively managed without controlling water resource development on the state-controlled tributaries of the river.[4]

After negotiating for six years, Congress adopted a National Water Law, No. 9433 (NWL) in January 1997 that incorporates most modern water resources management principles and instruments. The NWP states that water is a public good and a limited natural resource with an economic value; in situations of scarcity the priority use of water is for human and animal consumption; water resources management should always assure the multiple use of waters; the river basin is the territorial unit for water management; and management of water resources should be decentralized and participatory. In July 2000, Federal Law No. 9984 established the National Water Authority (Autoridade Nacional da Agua - ANA) with the mandate to implement the national water policy and establish criteria for granting of water usage rights and pricing mechanisms.[4]

The legal framework is completed with several water resources management laws created by the states starting in 1991. Although implemented at different times in the last 20 years, most of these state laws are structurally very similar among themselves and with National Water Law No. 9433.

State water resources management Law

State Law No. Enactment date
São Paulo 7,663 December 1991
Ceara 11,996 July 1992
Para 5,793 January 1994
Santa Catarina 9,748 November 1994
Acre 1,117 January 1994
Minas Gerais 11,504 June 1994
Rio Grande do Sul 10,530 December 1994
Bahia 6,855 May 1995
Rio Grande do Norte 6,908 July 1996
Paraiba 6,308 July 1996
Union 9,433 January 1997
Pernambuco 11,426 January 1997
Goias 13,123 July 1997
Sergipe 3,870 September 1997
Mato Grosso 6,945 November 1997
Alagoas 5,965 November 1997
Maranhao 7,052 December 1997
Espirito Santo 5,818 December 1998
Rio de Janeiro 3,239 August 1999
Parana 12,726 November 1999
Piaui 5,165 August 2000
Distrito Federal 2,725 June 2001

Source: MMA, 2001

Institutional organization

The National Water Resources Management System is a combination of organized public organizations, private entities, and civil society representatives which make the implementations of the water resources management instruments possible, in accordance with the principles established in the law. The institutional framework consists of the following:

The National Council on Water Resources (NCWR) is the highest organization in the system's hierarchy. It aims at promoting the integration of water resources planning at the national, regional, and state levels and between user sectors. The NCWR consists of representatives of the Federal Government ministries as well as representatives designated by the State Councils on Water Resources and representatives of water users and civil organizations concerned with water resources management. The Chairman of the National Water Resources Council is the Minister of the Environment.

The National Water Authority (Autoridade Nacional da Agua – ANA) is in charge of implementing the National Plan for Water Resources formulated by the NCWR. ANA consists of ten functional superintendencies with implementing and administrative functions headed by a president and four directors. ANA is under the Ministry of the Environment but has administrative and financial independence.

The River Basin Committees (RBC) are connected organizations that bring together stakeholders to discuss and decide on their own problems with the objective of protecting water resources in the river basin region. Under Brazilian law, they do not have legal status. RBCs include representatives of the Federal Government, the states, or the Federal District in which they are located (even if only partially), the municipalities, the water users and the water resources civil organizations that have a demonstrated record of action in the basin. The number of representatives from each sector mentioned, as well as the criteria for their appointments, are defined in the regulations of the Committees.

The River Basin Water Agencies act as the executive secretariats of the River Basin Committees. Although there is a close relationship between the committees and the agencies, the latter are very different from the former. The main difference is in their nature and organization: while the Committees act as what is called in Brazil "water parliaments," the Water Agencies operate more like executive organizations.

The Water Resources Civil Organizations (CWO) should be represented on the National Water Resources Council and should participate in the decision-making process. CWOs can be any of the following: (i) inter-municipal consortia, (ii) river basin associations, (iii) regional, local, or sectoral associations of water users, (iv) technical, academic, and research organizations, and (v) nongovernmental organizations (NGOs).[15]

Government strategy

The National Water Resources Policy was approved by Federal Law No. 9433/97. The National Water Resources Policy can be divided into three main sections:

In addition, Brazil's Government is undertaking a number of water resources management initiatives such as PROAGUA and PRODES. PROAGUA (Programa Nacional de Desenvolvimiento dos Recursos Hidricos - Federal Water Resources Management Project) aims at bettering the population's quality of life, especially that of the poor, by combining integrated water resources management with expansion and optimization of hydraulic infrastructure, promoting rational integrated and sustainable use and participatory management of water resources in Brazil. PRODES (Programa Despoluição de Bacias Hidrográficas or Basin Restoration Program) is an innovative program by the Brazilian Federal Government to finance wastewater treatment plants while providing financial incentives to properly operate and maintain the plants. It is a type of Output-based aid, as opposed to financing programs targeted only at inputs.

Users' Commissions

More recently, the advent of river basin or sub-basin commissions has changed the terms of the debate over the "ideal scale" of water services provision.[16]

The creation of Users’ Commissions, such as COGERH (created in 1993) in the Lower Jaguaribe/Banabuiú, and a (short-lived) similar organization in Curú, have served the overlapping goals of public participation, decentralization, and transparency.[17] According to Lemos and de Oliveira, such Users' Commissions have effectively mobilized "multidisciplinary" teams of experts—including sociologists, geographers, agronomists, and engineers—"not as organizers but as facilitators," for more participatory decision-making processes.[18]

The river basin committees represent a "new decision-making" arena which has begun to challenge the " =closed and technocratic" bureaucracy that Brazil inherited from its pre-democratic past. [19] For example, COGERH's recommendation to reduce water consumption voluntarily came as a shock to the traditional water policy-making establishment.[20] The Piracicaba, Capivari, and Jundiaí River Basin Committee (created by Law No. 7663/1991, formalized by November 1993) pioneered a shared decision-making model between users and state and local officials, which has been used as a model by several other committees in the state of São Paulo.[19]

Water management at the river basin level – The Alto Tietê river basin

Rio Tietê

See also:Water management in the Metropolitan Region of São Paulo
Unlike the semi-arid region which has had a long history of federal intervention, water management practices in the State of São Paulo have historically been a local affair, even for the federal waters crossing it. The Tietê Riverthe State of São Paulo's largest river— runs 1,100 km from its eastern source in the São Paulo Metropolitan Region to the western border of the state where it joins the Paraná River, which then runs southward toward the Rio de la Plata estuary between Argentina and Uruguay. The area covered by the Alto Tietê basin is almost coterminous with the Metropolitan Region of São Paulo. With a drainage area of 5,985 km2 (2.4% of the state's territory), the basin encompasses 35 of the 39 municipalities and 99.5% of the population of Greater São Paulo.

In 1991, Law 7.663 was enacted calling for the creation of the Alto-Tietê Basin Committee. However this committee was only formally established in November 1994, a result of a deliberate effort by the state técnicos (technical staff) to mobilize the municipal government and, especially, civil society. Its functions include setting guidelines and approving river basin plans; proposing pricing criteria and values for bulk water pricing and a program for allocating proceeds derived from such water charges; integrating the decision-making and programs of water-related institutions working in the basin; and other responsibilities. The 48 seats of the committee's assembly are divided equally among representatives of three sectors: municipal government, state government agencies (including public water users), and organized civil society groups (including those representing private water users). Local issues are decided in the five sub-committees created after 1997. Although the Alto-Tietê Committee created its basin agency in 2001, it is little more than a symbolic organization, while the state water management agency remains the committee's executive arm in charge of technical and administrative support.

As elsewhere in São Paulo, fully working basin institutions have yet to be created in the Alto Tietê Basin, mostly because the financial vitality of these bodies remains very limited. All in all, the Alto Tietê management system can be characterized as reasonably advanced, even though the rhythm of implementation has been much slower than the initial process of approving the water law and creating the basin committees.[2]

Bulk water tariffs

In 1999, no water fees were charged for the use of water for irrigation or for water supply in Brazil. In the hydroelectric subsector, a royalty fee (based on a percentage of the revenues collected by power companies) is paid to those states and municipalities where hydroelectric infrastructure and facilities are located. Water users in urban centers pay for the treatment and distribution of water and the collection of sewage, whereas farmers in public irrigation projects pay a tariff for the O&M of the projects.

The establishment of bulk water tariffs is currently one of the most emphasized pricing mechanisms in Brazil. However, the actual implementation of bulk water supply tariffs varies by state. For example, in the State of Ceara, prices for industrial users are 60 times higher than those for municipal users, who in turn pay as much as 10 times as that paid by agricultural users. [21]

Bulk water pricing structure in Ceara

Current prices (US$/1,000 m3) Estimated annual revenue (US$ million) Proposed Prices (US$/1,000m3) Estimated Annual Revenue (US$ million)
Industrial 545.50 100 663.60 121.65
Municipal 9.10 250 11.10 304.95
Irrigation, aquaculture, and others -- 150 12.20 185.78
Total 554.60 500 686.9 619.27

Source: World Bank, 1999

Water-related natural hazards

Droughts In the Northeast of Brazil droughts are a cyclical phenomenon occurring every 10 to 12 years, and some of them are very severe. The region has an annual average rainfall ranging from 400 to 800 mm, and an average water availability per person ranging from 1,320 to 1,781 m3 (the world's average was 8,209 m3 in 2007). The effects of droughts on the local, mostly poor, population are devastating.[22] Droughts are also frequent in the South, home of most of Brazil's industry, where the latest drought in 2000 culminated in a national energy crisis. (See Electricity sector in Brazil). [23]

Floods Along the Amazon River there is a complex mosaic of fluvial forms, including channels, active sandbars, islands, levees, scroll-dominated plains, and abandoned belts highly prone to floods in the summer months.[24] Hydrological variability and rapidly growing urban areas have caused new environmental problems in Brazilian cities, such as inundations in non-planned river basins. One of the causes of flood impacts is that public funds (national, state, or municipal) have barely introduced wise proactive policies to follow up rapidly growing urban areas.[25]

Potential climate change impacts

Deforestation in the Amazon Rainforest threatens many species of tree frogs, which are very sensitive to environmental changes (pictured: giant leaf frog)

Brazil's Government considers that, despite many studies, there is still much uncertainty about the consequences of climate change and its links to worsening critical events.[8] On the other hand, the Technical Summary of the Fourth Assessment Report of the UNFCC, reflecting a consensus view, indicates a potential Amazon forest loss of between 20 and 80% as a result of climate impacts induced by a temperature increase in the basin of between 2.0 and 3.0 degrees Celsius. The IPCC is also indicating a likelihood of major biodiversity extinctions as a consequence. Specifically, according to the Earth Simulator, temperature increases and disruption in precipitation cycles (up to a 90% reduction by the end of the century) could seriously hamper the workings of the Amazon as a forest ecosystem, reducing its capacity to retain carbon, increasing its soil temperature, and eventually forcing the Amazon through a gradual process of savannization.[26] These predictions were reinforced in 2005, when large sections of southwestern Amazonia experienced one of the most intense droughts of the last hundred years. The drought severely affected human population along the main channel of the Amazon River and its western and southwestern tributaries.

External cooperation

The World Bank is contributing US$1.2 million to assess the prospects and identification of the implications of Amazon dieback induced by climate change (overall, called "global warming") as well as assessing the long-term options that would be required to maintain the integrity of the basin. The World Bank is also collaborating with Brazil's Government on two projects for integrated water resources management in Rio Grande do Norte and Ceara. The World Bank also contributed US$198 million to the Federal Water Resources Management Project, PROAGUA, in 1998.

The Inter-American Development Bank has contributed technically and financially to the development of Brazil's National Water Plan. The National Water Plan aims at assuring water quality, quantity, and availability needed for Brazil's sustainable development. The IDB has also contributed to the governments of states such as Santa Catarina and Rio Grande do Sul in the preparation of a Master Plan for the Sustainable Development of the Region of the Upper Rio Uruguay Watershed.

See also


  1. ^ Division de Medioambiente (July 2005). "Buenas Practicas para la Creación, Mejoramiento y Operación Sostenible de Organismos y Organizaciones de Cuenca" (PDF). Inter-American Development Bank. pp. 17–19. Retrieved 2008-05-07.
  2. ^ a b Formiga Johnson; Rosa Maria and Kemper; Karin Erika (June 2005). "Institutional and Policy Analysis of River Basin Management: The alto-Tiete River Basin, São Paulo, Brazil" (PDF). The World Bank Policy Research Working Paper. p. 4. Retrieved 2008-03-07.
  3. ^ Formiga Johnson et al. (June 2005), op. cit., p.8
  4. ^ a b c d e Aquastat (2000). "Country Profiles: Brazil". Food and Agriculture Organization. p. 1. Retrieved 2008-04-07.
  5. ^ a b Clavelario, Judicael; et al. (June 2005). "Water Statistics in Brazil: An overview" (PDF). United Nations Inter-secretariat Working Group on Environment Statistics. pp. 1, 4–5. Retrieved 2008-03-11.
  6. ^ Young, Robert A. (October 1998). "Water Management Options for Ceara and Piaui, Brazil in the Prospect of Global Change" (PDF). [1] University of Kassel. p. 2. Retrieved 2008-04-25. ((cite web)): External link in |publisher= (help)
  7. ^ World Commission on Dams (November 2000). "Tucuruí Dam and Amazon/Tocantins River Basin". World Commission on Dams. p. 1. Retrieved 2008-03-11.
  8. ^ a b c Secretariat for Water Resources (2006). "National Water Resources Plan: Executive Synthesis" (PDF). Ministry of Environment. pp. 54–58, 66–74. Retrieved 2008-03-04.
  9. ^ Luiz Giatti, Leandro; et al. (2004). "Basic sanitary conditions in Iporanga, São Paulo State, Brazil" (PDF). Universidade de São Paulo. pp. 1, 3–5. Retrieved 2008-03-04.
  10. ^ WHO/UNICEF Joint Monitoring Program
  11. ^ Mejia, Abel; et al. (June 2003). "Water, Poverty Reduction and Sustainable Development" (PDF). World Bank. pp. 1, 3–6. Retrieved 2008-04-07.
  12. ^ Sampaio, J. & Silva, L. (June 2005). "Itaipú Dam: The world's largest hydroelectric plant". US Geological Survey. p. 1. Retrieved 2008-03-11.
  13. ^ a b The Nature Conservancy (June 2006). "Brazil Adopts Freshwater Ecoregions in First National Freshwater Management Plan". The Nature Conservancy. p. 1. Retrieved 2008-04-03.
  14. ^ Windows to the Universe (February 2002). "Explore the Wetland of Brazil". University Corporation for Atmospheric Research. p. 1. Retrieved 2008-04-03.
  15. ^ a b Garrido, Raymundo (n.d.). "Water Resources National Policy in Brazil" (PDF). World Commission on Dams. pp. 1, 4–11. Retrieved 2008-04-03. ((cite web)): External link in |publisher= (help)
  16. ^ Barraqué, B., Formiga Johnsson, R.M., and Britto, A.L. (2007). "Sustainable water services and interaction with water resources in Europe and in Brazil" (PDF). Hydrology and Earth System Sciences Discussions. pp. 3447–3449, 3463. Retrieved 2008-04-25.((cite web)): CS1 maint: multiple names: authors list (link)
  17. ^ Lemos and de Oliveira 2005.
  18. ^ Lemos and de Oliveira 2005: 140.
  19. ^ a b do Amaral; Helena Kerr (1996). "Brazilian Water Resource Policy in the Nineties". Instituto Cultural Minerva. p. 1. Retrieved 2008-04-25.
  20. ^ Lemos and de Oliveira 2005: 143.
  21. ^ Asad, Musa; et al. (June 1999). "Management of Water Resources: Bulk Water Pricing in Brazil" (PDF). World Bank. pp. 1, 18–32. Retrieved 2008-04-03.
  22. ^ Agencia Nacional de Aguas (2005). "Proagua Semi-Arido: Achievements and Results". Agencia Nacional de Aguas. p. 1. Retrieved 2008-04-03.
  23. ^ Formiga Johnson et al. (June 2005), op. cit., p. 38-42
  24. ^ Latrubesse E.M. & Franzinelli E. (May 2002). "The Holocene alluvial plain of the middle Amazon River, Brazil". Elsevier. p. 1. Retrieved 2008-04-03.
  25. ^ Graciosa, M C (n.d.). "Urban Flood Risk Insurance Models as a Strategy for Proactive Water Management Policies". University of São Paulo. p. 1. Retrieved 2008-04-03.
  26. ^ Vergara, Walter; et al. (November 2007). "Visualizing Future Climate in Latin America: Results from the Application of the Earth Simulator" (PDF). World Bank. pp. 1, 13. Retrieved 2008-04-03.