Water resources

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Distribution of freshwater resources by type [1]

   Glaciers (69%)
   Groundwater (30%)
  Other Freshwater (e.g., Soil Moisture) (0.7%)
  Directly Accessible Water (0.3%)

Water resources are natural resources of water that are potentially useful for humans, for example as a source of drinking water supply or irrigation water. These resources can be either freshwater from natural sources, or water produced artificially from other sources, such as from reclaimed water (wastewater) or desalinated water (seawater). 97% of the water on Earth is salt water and only three percent is fresh water; slightly over two-thirds of this is frozen in glaciers and polar ice caps. [2] The remaining unfrozen freshwater is found mainly as groundwater, with only a small fraction present above ground or in the air. [3] Natural sources of fresh water include surface water, under river flow, groundwater and frozen water. People use water resources for agricultural, industrial and household activities.

Contents

Water resources are under threat from multiple issues. There is water scarcity, water pollution, water conflict and climate change. Fresh water is in principle a renewable resource. However, the world's supply of groundwater is steadily decreasing. Groundwater depletion (or overdrafting) is occurring for example in Asia, South America and North America.

Natural sources of fresh water

Natural sources of fresh water include surface water, under river flow, groundwater and frozen water.

Surface water

Lake Chungara and Parinacota volcano in northern Chile Parinacota.jpg
Lake Chungará and Parinacota volcano in northern Chile

Surface water is water in a river, lake or fresh water wetland. Surface water is naturally replenished by precipitation and naturally lost through discharge to the oceans, evaporation, evapotranspiration and groundwater recharge. The only natural input to any surface water system is precipitation within its watershed. The total quantity of water in that system at any given time is also dependent on many other factors. These factors include storage capacity in lakes, wetlands and artificial reservoirs, the permeability of the soil beneath these storage bodies, the runoff characteristics of the land in the watershed, the timing of the precipitation and local evaporation rates. All of these factors also affect the proportions of water loss.

Humans often increase storage capacity by constructing reservoirs and decrease it by draining wetlands. Humans often increase runoff quantities and velocities by paving areas and channelizing the stream flow.

Natural surface water can be augmented by importing surface water from another watershed through a canal or pipeline.

Brazil is estimated to have the largest supply of fresh water in the world, followed by Russia and Canada. [4]

Water from glaciers

Glacier runoff is considered to be surface water. The Himalayas, which are often called "The Roof of the World", contain some of the most extensive and rough high altitude areas on Earth as well as the greatest area of glaciers and permafrost outside of the poles. Ten of Asia's largest rivers flow from there, and more than a billion people's livelihoods depend on them. To complicate matters, temperatures there are rising more rapidly than the global average. In Nepal, the temperature has risen by 0.6 degrees Celsius over the last decade, whereas globally, the Earth has warmed approximately 0.7 degrees Celsius over the last hundred years. [5]

Groundwater

Relative groundwater travel times in the subsurface Groundwater flow.svg
Relative groundwater travel times in the subsurface
This section is an excerpt from Groundwater.[ edit ]

Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in the fractures of rock formations. About 30 percent of all readily available freshwater in the world is groundwater. [6] A unit of rock or an unconsolidated deposit is called an aquifer when it can yield a usable quantity of water. The depth at which soil pore spaces or fractures and voids in rock become completely saturated with water is called the water table. Groundwater is recharged from the surface; it may discharge from the surface naturally at springs and seeps, and can form oases or wetlands. Groundwater is also often withdrawn for agricultural, municipal, and industrial use by constructing and operating extraction wells. The study of the distribution and movement of groundwater is hydrogeology, also called groundwater hydrology.

Typically, groundwater is thought of as water flowing through shallow aquifers, but, in the technical sense, it can also contain soil moisture, permafrost (frozen soil), immobile water in very low permeability bedrock, and deep geothermal or oil formation water. Groundwater is hypothesized to provide lubrication that can possibly influence the movement of faults. It is likely that much of Earth's subsurface contains some water, which may be mixed with other fluids in some instances.

Under river flow

Throughout the course of a river, the total volume of water transported downstream will often be a combination of the visible free water flow together with a substantial contribution flowing through rocks and sediments that underlie the river and its floodplain called the hyporheic zone. For many rivers in large valleys, this unseen component of flow may greatly exceed the visible flow. The hyporheic zone often forms a dynamic interface between surface water and groundwater from aquifers, exchanging flow between rivers and aquifers that may be fully charged or depleted. This is especially significant in karst areas where pot-holes and underground rivers are common.

Artificial sources of usable water

There are several artificial sources of fresh water. One is treated wastewater (reclaimed water). Another is atmospheric water generators. [7] [8] [9] Desalinated seawater is another important source. It is important to consider the economic and environmental side effects of these technologies. [10]

Wastewater reuse

This section is an excerpt from Reclaimed water.[ edit ]

Water reclamation is the process of converting municipal wastewater or sewage and industrial wastewater into water that can be reused for a variety of purposes . It is also called wastewater reuse, water reuse or water recycling. There are many types of reuse. It is possible to reuse water in this way in cities or for irrigation in agriculture. Other types of reuse are environmental reuse, industrial reuse, and reuse for drinking water, whether planned or not. Reuse may include irrigation of gardens and agricultural fields or replenishing surface water and groundwater. This latter is also known as groundwater recharge. Reused water also serve various needs in residences such as toilet flushing, businesses, and industry. It is possible to treat wastewater to reach drinking water standards. Injecting reclaimed water into the water supply distribution system is known as direct potable reuse. Drinking reclaimed water is not typical. [11] Reusing treated municipal wastewater for irrigation is a long-established practice. This is especially so in arid countries. Reusing wastewater as part of sustainable water management allows water to remain an alternative water source for human activities. This can reduce scarcity. It also eases pressures on groundwater and other natural water bodies. [12]

There are several technologies used to treat wastewater for reuse. A combination of these technologies can meet strict treatment standards and make sure that the processed water is hygienically safe, meaning free from pathogens. The following are some of the typical technologies: Ozonation, ultrafiltration, aerobic treatment (membrane bioreactor), forward osmosis, reverse osmosis, and advanced oxidation, [13] or activated carbon. [14] Some water-demanding activities do not require high grade water. In this case, wastewater can be reused with little or no treatment.

Desalinated water

This section is an excerpt from Desalination.[ edit ]

Desalination is a process that removes mineral components from saline water. More generally, desalination is the removal of salts and minerals from a substance. [15] One example is soil desalination. This is important for agriculture. It is possible to desalinate saltwater, especially sea water, to produce water for human consumption or irrigation. The by-product of the desalination process is brine. [16] Many seagoing ships and submarines use desalination. Modern interest in desalination mostly focuses on cost-effective provision of fresh water for human use. Along with recycled wastewater, it is one of the few water resources independent of rainfall. [17]

Due to its energy consumption, desalinating sea water is generally more costly than fresh water from surface water or groundwater, water recycling and water conservation; however, these alternatives are not always available and depletion of reserves is a critical problem worldwide. [18] [19] [20] Desalination processes are using either thermal methods (in the case of distillation) or membrane-based methods (e.g. in the case of reverse osmosis). [21] [22] : 24 

Research into other options

Schematic illustration of a proposed approach for capturing moisture above the ocean surface and transporting it to proximal land for improving water security Schematic illustration of a proposed approach for capturing moisture above the ocean surface and transporting it to proximal land for improving water security.webp
Schematic illustration of a proposed approach for capturing moisture above the ocean surface and transporting it to proximal land for improving water security

Researchers proposed air capture over oceans which would "significantly increasing freshwater through the capture of humid air over oceans" to address present and, especially, future water scarcity/insecurity. [24] [23]

A 2021 study proposed hypothetical portable solar-powered atmospheric water harvesting devices. However, such off-the-grid generation may sometimes "undermine efforts to develop permanent piped infrastructure" among other problems. [25] [26] [27]

Water uses

Total renewable freshwater resources of the world, in mm/year (1 mm is equivalent to 1 L of water per m ) (long-term average for the years 1961-1990). Resolution is 0.5deg longitude x 0.5deg latitude (equivalent to 55 km x 55 km at the equator). Computed by the global freshwater model WaterGAP. Total Renewable Freshwater Resources in mm per year By WaterGAP Average 1961-1990.jpg
Total renewable freshwater resources of the world, in mm/year (1 mm is equivalent to 1 L of water per m ) (long-term average for the years 1961–1990). Resolution is 0.5° longitude x 0.5° latitude (equivalent to 55 km x 55 km at the equator). Computed by the global freshwater model WaterGAP.
Map of water stress and spatial variability of water yield along the delineated near-offshore region of 200 km across the world Spatial variability of water yield along the delineated near-offshore region of 200 km across the world.webp
Map of water stress and spatial variability of water yield along the delineated near-offshore region of 200 km across the world

The total quantity of water available at any given time is an important consideration. Some human water users have an intermittent need for water. For example, many farms require large quantities of water in the spring, and no water at all in the winter. Other users have a continuous need for water, such as a power plant that requires water for cooling. Over the long term the average rate of precipitation within a watershed is the upper bound for average consumption of natural surface water from that watershed.

Agriculture and other irrigation

This section is an excerpt from Irrigation.[ edit ]
Irrigation of agricultural fields in Andalusia, Spain. Irrigation canal on the left. Fields SW from Sevilla.jpg
Irrigation of agricultural fields in Andalusia, Spain. Irrigation canal on the left.

Irrigation (also referred to as watering of plants) is the practice of applying controlled amounts of water to land to help grow crops, landscape plants, and lawns. Irrigation has been a key aspect of agriculture for over 5,000 years and has been developed by many cultures around the world. Irrigation helps to grow crops, maintain landscapes, and revegetate disturbed soils in dry areas and during times of below-average rainfall. In addition to these uses, irrigation is also employed to protect crops from frost, [28] suppress weed growth in grain fields, and prevent soil consolidation. It is also used to cool livestock, reduce dust, dispose of sewage, and support mining operations. Drainage, which involves the removal of surface and sub-surface water from a given location, is often studied in conjunction with irrigation.

There are several methods of irrigation that differ in how water is supplied to plants. Surface irrigation, also known as gravity irrigation, is the oldest form of irrigation and has been in use for thousands of years. In sprinkler irrigation, water is piped to one or more central locations within the field and distributed by overhead high-pressure water devices. Micro-irrigation is a system that distributes water under low pressure through a piped network and applies it as a small discharge to each plant. Micro-irrigation uses less pressure and water flow than sprinkler irrigation. Drip irrigation delivers water directly to the root zone of plants. Subirrigation has been used in field crops in areas with high water tables for many years. It involves artificially raising the water table to moisten the soil below the root zone of plants.

Irrigation water can come from groundwater (extracted from springs or by using wells), from surface water (withdrawn from rivers, lakes or reservoirs) or from non-conventional sources like treated wastewater, desalinated water, drainage water, or fog collection. Irrigation can be supplementary to rainfall, which is common in many parts of the world as rainfed agriculture, or it can be full irrigation, where crops rarely rely on any contribution from rainfall. Full irrigation is less common and only occurs in arid landscapes with very low rainfall or when crops are grown in semi-arid areas outside of rainy seasons.

Industries

It is estimated that 22% of worldwide water is used in industry. [29] Major industrial users include hydroelectric dams, thermoelectric power plants, which use water for cooling, ore and oil refineries, which use water in chemical processes, and manufacturing plants, which use water as a solvent. Water withdrawal can be very high for certain industries, but consumption is generally much lower than that of agriculture.

Water is used in renewable power generation. Hydroelectric power derives energy from the force of water flowing downhill, driving a turbine connected to a generator. This hydroelectricity is a low-cost, non-polluting, renewable energy source. Significantly, hydroelectric power can also be used for load following unlike most renewable energy sources which are intermittent. Ultimately, the energy in a hydroelectric power plant is supplied by the sun. Heat from the sun evaporates water, which condenses as rain in higher altitudes and flows downhill. Pumped-storage hydroelectric plants also exist, which use grid electricity to pump water uphill when demand is low, and use the stored water to produce electricity when demand is high.

Thermoelectric power plants using cooling towers have high consumption, nearly equal to their withdrawal, as most of the withdrawn water is evaporated as part of the cooling process. The withdrawal, however, is lower than in once-through cooling systems.

Water is also used in many large scale industrial processes, such as thermoelectric power production, oil refining, fertilizer production and other chemical plant use, and natural gas extraction from shale rock. Discharge of untreated water from industrial uses is pollution. Pollution includes discharged solutes and increased water temperature (thermal pollution).

Drinking water and domestic use (households)

Drinking water Drinking water.jpg
Drinking water

It is estimated that 8% of worldwide water use is for domestic purposes. [29] These include drinking water, bathing, cooking, toilet flushing, cleaning, laundry and gardening. Basic domestic water requirements have been estimated by Peter Gleick at around 50 liters per person per day, excluding water for gardens.

Drinking water is water that is of sufficiently high quality so that it can be consumed or used without risk of immediate or long term harm. Such water is commonly called potable water. In most developed countries, the water supplied to domestic, commerce and industry is all of drinking water standard even though only a very small proportion is actually consumed or used in food preparation.

844 million people still lacked even a basic drinking water service in 2017. [30] : 3  Of those, 159 million people worldwide drink water directly from surface water sources, such as lakes and streams. [30] : 3  One in eight people in the world do not have access to safe water. [31] [32]

Challenges and threats

Water scarcity

This section is an excerpt from Water scarcity.[ edit ]
Water scarcity (closely related to water stress or water crisis) is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity. [33] : 560  Physical water scarcity is where there is not enough water to meet all demands. This includes water needed for ecosystems to function. Regions with a desert climate often face physical water scarcity. [34] Central Asia, West Asia, and North Africa are examples of arid areas. Economic water scarcity results from a lack of investment in infrastructure or technology to draw water from rivers, aquifers, or other water sources. It also results from weak human capacity to meet water demand. [33] : 560  Many people in Sub-Saharan Africa are living with economic water scarcity. [35] : 11 

Water pollution

Polluted water Water pollution.jpg
Polluted water
This section is an excerpt from Water pollution.[ edit ]
Water pollution (or aquatic pollution) is the contamination of water bodies, with a negative impact on their uses. [36] : 6  It is usually a result of human activities. Water bodies include lakes, rivers, oceans, aquifers, reservoirs and groundwater. Water pollution results when contaminants mix with these water bodies. Contaminants can come from one of four main sources. These are sewage discharges, industrial activities, agricultural activities, and urban runoff including stormwater. [37] Water pollution may affect either surface water or groundwater. This form of pollution can lead to many problems. One is the degradation of aquatic ecosystems. Another is spreading water-borne diseases when people use polluted water for drinking or irrigation. [38] Water pollution also reduces the ecosystem services such as drinking water provided by the water resource.

Water conflict

This section is an excerpt from Water conflict.[ edit ]
Ethiopia's move to fill the dam's reservoir could reduce Nile flows by as much as 25% and devastate Egyptian farmlands. Vallee fertile du Nil a Louxor.jpg
Ethiopia's move to fill the dam's reservoir could reduce Nile flows by as much as 25% and devastate Egyptian farmlands.
Water conflict typically refers to violence or disputes associated with access to, or control of, water resources, or the use of water or water systems as weapons or casualties of conflicts. The term water war is colloquially used in media for some disputes over water, and often is more limited to describing a conflict between countries, states, or groups over the rights to access water resources. [40] [41] The United Nations recognizes that water disputes result from opposing interests of water users, public or private. [42] A wide range of water conflicts appear throughout history, though they are rarely traditional wars waged over water alone. [43] Instead, water has long been a source of tension and one of the causes for conflicts. Water conflicts arise for several reasons, including territorial disputes, a fight for resources, and strategic advantage. [44]

Climate change

This section is an excerpt from Water security § Climate change.[ edit ]
Impacts of climate change that are tied to water, affect people's water security on a daily basis. They include more frequent and intense heavy precipitation which affects the frequency, size and timing of floods. [45] Also droughts can alter the total amount of freshwater and cause a decline in groundwater storage, and reduction in groundwater recharge. [46] Reduction in water quality due to extreme events can also occur. [47] : 558  Faster melting of glaciers can also occur. [48]

Groundwater overdrafting

The world's supply of groundwater is steadily decreasing. Groundwater depletion (or overdrafting) is occurring for example in Asia, South America and North America. It is still unclear how much natural renewal balances this usage, and whether ecosystems are threatened. [49]

This section is an excerpt from Overdrafting.[ edit ]
Within a long period of groundwater depletion in California's Central Valley, short periods of recovery were mostly driven by extreme weather events that typically caused flooding and had negative social, environmental and economic consequences. 1960- Groundwater loss - depletion - Central Valley of California.svg
Within a long period of groundwater depletion in California's Central Valley, short periods of recovery were mostly driven by extreme weather events that typically caused flooding and had negative social, environmental and economic consequences.
Overdrafting is the process of extracting groundwater beyond the equilibrium yield of an aquifer. Groundwater is one of the largest sources of fresh water and is found underground. The primary cause of groundwater depletion is the excessive pumping of groundwater up from underground aquifers. Insufficient recharge can lead to depletion, reducing the usefulness of the aquifer for humans. Depletion can also have impacts on the environment around the aquifer, such as soil compression and land subsidence, local climatic change, soil chemistry changes, and other deterioration of the local environment.

Water resource management

Global values of water resources and human water use (excluding Antarctica). Water resources 1961-90, water use around 2000. Computed by the global freshwater model WaterGAP. Global Values of Water Resources and Water Use.jpg
Global values of water resources and human water use (excluding Antarctica). Water resources 1961-90, water use around 2000. Computed by the global freshwater model WaterGAP.

Water resource management is the activity of planning, developing, distributing and managing the optimum use of water resources. It is an aspect of water cycle management. The field of water resources management will have to continue to adapt to the current and future issues facing the allocation of water. With the growing uncertainties of global climate change and the long-term impacts of past management actions, this decision-making will be even more difficult. It is likely that ongoing climate change will lead to situations that have not been encountered. As a result, alternative management strategies, including participatory approaches and adaptive capacity are increasingly being used to strengthen water decision-making.

Ideally, water resource management planning has regard to all the competing demands for water and seeks to allocate water on an equitable basis to satisfy all uses and demands. As with other resource management, this is rarely possible in practice so decision-makers must prioritise issues of sustainability, equity and factor optimisation (in that order!) to achieve acceptable outcomes. One of the biggest concerns for water-based resources in the future is the sustainability of the current and future water resource allocation.

Sustainable Development Goal 6 has a target related to water resources management: "Target 6.5: By 2030, implement integrated water resources management at all levels, including through transboundary cooperation as appropriate." [51] [52]

Sustainable water management

At present, only about 0.08 percent of all the world's fresh water is accessible. And there is ever-increasing demand for drinking, manufacturing, leisure and agriculture. Due to the small percentage of water available, optimizing the fresh water we have left from natural resources has been a growing challenge around the world.

Much effort in water resource management is directed at optimizing the use of water and in minimizing the environmental impact of water use on the natural environment. The observation of water as an integral part of the ecosystem is based on integrated water resources management, based on the 1992 Dublin Principles (see below).

Sustainable water management requires a holistic approach based on the principles of Integrated Water Resource Management, originally articulated in 1992 at the Dublin (January) and Rio (July) conferences. The four Dublin Principles, promulgated in the Dublin Statement are:

  1. Fresh water is a finite and vulnerable resource, essential to sustain life, development and the environment;
  2. Water development and management should be based on a participatory approach, involving users, planners and policy-makers at all levels;
  3. Women play a central part in the provision, management and safeguarding of water;
  4. Water has an economic value in all its competing uses and should be recognized as an economic good.

Implementation of these principles has guided reform of national water management law around the world since 1992.

Further challenges to sustainable and equitable water resources management include the fact that many water bodies are shared across boundaries which may be international (see water conflict) or intra-national (see Murray-Darling basin).

Integrated water resources management

Integrated water resources management (IWRM) has been defined by the Global Water Partnership (GWP) as "a process which promotes the coordinated development and management of water, land and related resources, in order to maximize the resultant economic and social welfare in an equitable manner without compromising the sustainability of vital ecosystems". [53]

Some scholars say that IWRM is complementary to water security because water security is a goal or destination, whilst IWRM is the process necessary to achieve that goal. [54]

IWRM is a paradigm that emerged at international conferences in the late 1900s and early 2000s, although participatory water management institutions have existed for centuries. [55] Discussions on a holistic way of managing water resources began already in the 1950s leading up to the 1977 United Nations Water Conference. [56] The development of IWRM was particularly recommended in the final statement of the ministers at the International Conference on Water and the Environment in 1992, known as the Dublin Statement. This concept aims to promote changes in practices which are considered fundamental to improved water resource management. IWRM was a topic of the second World Water Forum, which was attended by a more varied group of stakeholders than the preceding conferences and contributed to the creation of the GWP. [55]

In the International Water Association definition, IWRM rests upon three principles that together act as the overall framework: [57]

  1. Social equity: ensuring equal access for all users (particularly marginalized and poorer user groups) to an adequate quantity and quality of water necessary to sustain human well-being.
  2. Economic efficiency: bringing the greatest benefit to the greatest number of users possible with the available financial and water resources.
  3. Ecological sustainability: requiring that aquatic ecosystems are acknowledged as users and that adequate allocation is made to sustain their natural functioning.

In 2002, the development of IWRM was discussed at the World Summit on Sustainable Development held in Johannesburg, which aimed to encourage the implementation of IWRM at a global level. [58] The third World Water Forum recommended IWRM and discussed information sharing, stakeholder participation, and gender and class dynamics. [55]

Operationally, IWRM approaches involve applying knowledge from various disciplines as well as the insights from diverse stakeholders to devise and implement efficient, equitable and sustainable solutions to water and development problems. As such, IWRM is a comprehensive, participatory planning and implementation tool for managing and developing water resources in a way that balances social and economic needs, and that ensures the protection of ecosystems for future generations. In addition, in light of contributing the achievement of Sustainable Development goals (SDGs), [59] IWRM has been evolving into more sustainable approach as it considers the Nexus approach, which is a cross-sectoral water resource management. The Nexus approach is based on the recognition that "water, energy and food are closely linked through global and local water, carbon and energy cycles or chains."

An IWRM approach aims at avoiding a fragmented approach of water resources management by considering the following aspects: Enabling environment, roles of Institutions, management Instruments. Some of the cross-cutting conditions that are also important to consider when implementing IWRM are: Political will and commitment, capacity development, adequate investment, financial stability and sustainable cost recovery, monitoring and evaluation. There is not one correct administrative model. The art of IWRM lies in selecting, adjusting and applying the right mix of these tools for a given situation. IWRM practices depend on context; at the operational level, the challenge is to translate the agreed principles into concrete action.

Managing water in urban settings

Typical urban water cycle depicting drinking water purification and municipal sewage treatment systems Urban Water Cycle - EPA 2004.png
Typical urban water cycle depicting drinking water purification and municipal sewage treatment systems
This section is an excerpt from Integrated urban water management.[ edit ]

Integrated urban water management (IUWM) is the practice of managing freshwater, wastewater, and storm water as components of a basin-wide management plan. It builds on existing water supply and sanitation considerations within an urban settlement by incorporating urban water management within the scope of the entire river basin. [60] IUWM is commonly seen as a strategy for achieving the goals of Water Sensitive Urban Design. IUWM seeks to change the impact of urban development on the natural water cycle, based on the premise that by managing the urban water cycle as a whole; a more efficient use of resources can be achieved providing not only economic benefits but also improved social and environmental outcomes. One approach is to establish an inner, urban, water cycle loop through the implementation of reuse strategies. Developing this urban water cycle loop requires an understanding both of the natural, pre-development, water balance and the post-development water balance. Accounting for flows in the pre- and post-development systems is an important step toward limiting urban impacts on the natural water cycle. [61]

IUWM within an urban water system can also be conducted by performance assessment of any new intervention strategies by developing a holistic approach which encompasses various system elements and criteria including sustainability type ones in which integration of water system components including water supply, waste water and storm water subsystems would be advantageous. [62] Simulation of metabolism type flows in urban water system can also be useful for analysing processes in urban water cycle of IUWM. [62] [63]

By country

Water resource management and governance is handled differently by different countries. For example, in the United States, the United States Geological Survey (USGS) and its partners monitor water resources, conduct research and inform the public about groundwater quality. [64] Water resources in specific countries are described below:

See also

Related Research Articles

<span class="mw-page-title-main">Groundwater</span> Water located beneath the ground surface

Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in the fractures of rock formations. About 30 percent of all readily available freshwater in the world is groundwater. A unit of rock or an unconsolidated deposit is called an aquifer when it can yield a usable quantity of water. The depth at which soil pore spaces or fractures and voids in rock become completely saturated with water is called the water table. Groundwater is recharged from the surface; it may discharge from the surface naturally at springs and seeps, and can form oases or wetlands. Groundwater is also often withdrawn for agricultural, municipal, and industrial use by constructing and operating extraction wells. The study of the distribution and movement of groundwater is hydrogeology, also called groundwater hydrology.

<span class="mw-page-title-main">Water conservation</span> Policies for sustainable development of water use

Water conservation aims to sustainably manage the natural resource of fresh water, protect the hydrosphere, and meet current and future human demand. Water conservation makes it possible to avoid water scarcity. It covers all the policies, strategies and activities to reach these aims. Population, household size and growth and affluence all affect how much water is used.

<span class="mw-page-title-main">Reclaimed water</span> Converting wastewater into water that can be reused for other purposes

Water reclamation is the process of converting municipal wastewater or sewage and industrial wastewater into water that can be reused for a variety of purposes. It is also called wastewater reuse, water reuse or water recycling. There are many types of reuse. It is possible to reuse water in this way in cities or for irrigation in agriculture. Other types of reuse are environmental reuse, industrial reuse, and reuse for drinking water, whether planned or not. Reuse may include irrigation of gardens and agricultural fields or replenishing surface water and groundwater. This latter is also known as groundwater recharge. Reused water also serve various needs in residences such as toilet flushing, businesses, and industry. It is possible to treat wastewater to reach drinking water standards. Injecting reclaimed water into the water supply distribution system is known as direct potable reuse. Drinking reclaimed water is not typical. Reusing treated municipal wastewater for irrigation is a long-established practice. This is especially so in arid countries. Reusing wastewater as part of sustainable water management allows water to remain an alternative water source for human activities. This can reduce scarcity. It also eases pressures on groundwater and other natural water bodies.

<span class="mw-page-title-main">Water supply network</span> System of engineered hydrologic and hydraulic components providing water

A water supply network or water supply system is a system of engineered hydrologic and hydraulic components that provide water supply. A water supply system typically includes the following:

  1. A drainage basin
  2. A raw water collection point where the water accumulates, such as a lake, a river, or groundwater from an underground aquifer. Raw water may be transferred using uncovered ground-level aqueducts, covered tunnels, or underground water pipes to water purification facilities.
  3. Water purification facilities. Treated water is transferred using water pipes.
  4. Water storage facilities such as reservoirs, water tanks, or water towers. Smaller water systems may store the water in cisterns or pressure vessels. Tall buildings may also need to store water locally in pressure vessels in order for the water to reach the upper floors.
  5. Additional water pressurizing components such as pumping stations may need to be situated at the outlet of underground or aboveground reservoirs or cisterns.
  6. A pipe network for distribution of water to consumers and other usage points
  7. Connections to the sewers are generally found downstream of the water consumers, but the sewer system is considered to be a separate system, rather than part of the water supply system.
<span class="mw-page-title-main">Water politics</span> Politics affected by the availability of water and water resources

Water politics, sometimes called hydropolitics, is politics affected by the availability of water and water resources, a necessity for all life forms and human development.

<span class="mw-page-title-main">Water supply and sanitation in Saudi Arabia</span>

Water supply and sanitation in Saudi Arabia is characterized by challenges and achievements. One of the main challenges is water scarcity. In order to overcome water scarcity, substantial investments have been undertaken in seawater desalination, water distribution, sewerage and wastewater treatment. Today about 50% of drinking water comes from desalination, 40% from the mining of non-renewable groundwater and only 10% from surface water in the mountainous southwest of the country. The capital Riyadh, located in the heart of the country, is supplied with desalinated water pumped from the Persian Gulf over a distance of 467 km. Water is provided almost for free to residential users. Despite improvements, service quality remains poor, for example in terms of continuity of supply. Another challenge is weak institutional capacity and governance, reflecting general characteristics of the public sector in Saudi Arabia. Among the achievements is a significant increases in desalination, and in access to water, the expansion of wastewater treatment, as well as the use of treated effluent for the irrigation of urban green spaces, and for agriculture.

<span class="mw-page-title-main">Water scarcity</span> Situation where there is a shortage of water

Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity. Physical water scarcity is where there is not enough water to meet all demands. This includes water needed for ecosystems to function. Regions with a desert climate often face physical water scarcity. Central Asia, West Asia, and North Africa are examples of arid areas. Economic water scarcity results from a lack of investment in infrastructure or technology to draw water from rivers, aquifers, or other water sources. It also results from weak human capacity to meet water demand. Many people in Sub-Saharan Africa are living with economic water scarcity.

Peak water is a concept that underlines the growing constraints on the availability, quality, and use of freshwater resources. Peak water was defined in 2010 by Peter Gleick and Meena Palaniappan. They distinguish between peak renewable, peak non-renewable, and peak ecological water to demonstrate the fact that although there is a vast amount of water on the planet, sustainably managed water is becoming scarce.

<span class="mw-page-title-main">Water security</span> A goal of water management to harness water-related opportunities and manage risks

The aim of water security is to make the most of water's benefits for humans and ecosystems. The second aim is to limit the risks of destructive impacts of water to an acceptable level. These risks include for example too much water (flood), too little water or poor quality (polluted) water. People who live with a high level of water security always have access to "an acceptable quantity and quality of water for health, livelihoods and production". For example, access to water, sanitation and hygiene services is one part of water security. Some organizations use the term water security more narrowly for water supply aspects only.

<span class="mw-page-title-main">Integrated urban water management</span>

Integrated urban water management (IUWM) is the practice of managing freshwater, wastewater, and storm water as components of a basin-wide management plan. It builds on existing water supply and sanitation considerations within an urban settlement by incorporating urban water management within the scope of the entire river basin. IUWM is commonly seen as a strategy for achieving the goals of Water Sensitive Urban Design. IUWM seeks to change the impact of urban development on the natural water cycle, based on the premise that by managing the urban water cycle as a whole; a more efficient use of resources can be achieved providing not only economic benefits but also improved social and environmental outcomes. One approach is to establish an inner, urban, water cycle loop through the implementation of reuse strategies. Developing this urban water cycle loop requires an understanding both of the natural, pre-development, water balance and the post-development water balance. Accounting for flows in the pre- and post-development systems is an important step toward limiting urban impacts on the natural water cycle.

<span class="mw-page-title-main">Water scarcity in Africa</span> Overview of water scarcity in Africa

The main causes of water scarcity in Africa are physical and economic water scarcity, rapid population growth, and the effects of climate change on the water cycle. Water scarcity is the lack of fresh water resources to meet the standard water demand. The rainfall in sub-Saharan Africa is highly seasonal and unevenly distributed, leading to frequent floods and droughts.

<span class="mw-page-title-main">Water supply and sanitation in Namibia</span>

Namibia is an arid country that is regularly afflicted by droughts. Large rivers flow only along its northern and southern borders, but they are far from the population centers. They are also far from the country's mines, which are large water users. In order to confront this challenge, the country has built dams to capture the flow from ephemeral rivers, constructed pipelines to transport water over large distances, pioneered potable water reuse in its capital Windhoek located in the central part of Namibia, and built Sub-Saharan Africa's first large seawater desalination plant to supply a uranium mine and the city of Swakopmund with water. A large scheme to bring water from the Okavango River in the North to Windhoek, the Eastern National Water Carrier, was only partially completed during the 1980s.

<span class="mw-page-title-main">Water resource policy</span>

Water resource policy, sometimes called water resource management or water management, encompasses the policy-making processes and legislation that affect the collection, preparation, use, disposal, and protection of water resources. The long-term viability of water supply systems poses a significant challenge as a result of water resource depletion, climate change, and population expansion.

<span class="mw-page-title-main">Water issues in developing countries</span> Water issues and problems in developing countries are diverse and serious

Water issues in developing countries include scarcity of drinking water, poor infrastructure for water and sanitation access, water pollution, and low levels of water security. Over one billion people in developing countries have inadequate access to clean water. The main barriers to addressing water problems in developing nations include poverty, costs of infrastructure, and poor governance. The effects of climate change on the water cycle can make these problems worse.

Beijing, the capital of China, is characterized by intense water scarcity during the long dry season as well as heavy flooding during the brief wet season. Beijing is one of the most water-scarce cities in the world. Total water use is 3.6 billion cubic meters, compared to renewable fresh water resources of about 3 billion cubic meters. The difference is made up by the overexploitation of groundwater. Two-thirds of the water supply comes from groundwater, one third from surface water. Average rainfall has substantially declined since the 1950s. Furthermore, one of the two main rivers supplying the city, the Yongding River, had to be abandoned as a source of drinking water because of pollution. Water savings in industry and agriculture have compensated for these losses and freed up water for residential uses.

<span class="mw-page-title-main">Water scarcity in Iran</span> Water shortage of Iran

Water scarcity in Iran is caused by high climatic variability, uneven distribution of water, over exploitation of available water resources,and prioritization of economic development. Water scarcity in Iran is further exacerbated by climate change.

<span class="mw-page-title-main">Groundwater pollution</span> Ground released seep into groundwater

Groundwater pollution occurs when pollutants are released to the ground and make their way into groundwater. This type of water pollution can also occur naturally due to the presence of a minor and unwanted constituent, contaminant, or impurity in the groundwater, in which case it is more likely referred to as contamination rather than pollution. Groundwater pollution can occur from on-site sanitation systems, landfill leachate, effluent from wastewater treatment plants, leaking sewers, petrol filling stations, hydraulic fracturing (fracking) or from over application of fertilizers in agriculture. Pollution can also occur from naturally occurring contaminants, such as arsenic or fluoride. Using polluted groundwater causes hazards to public health through poisoning or the spread of disease.

<span class="mw-page-title-main">Water reuse in California</span>

Water reuse in California is the use of reclaimed water for beneficial use. As a heavily populated state in the drought-prone arid west, water reuse is developing as an integral part of water in California enabling both the economy and population to grow.

<span class="mw-page-title-main">Sustainable Development Goal 6</span> Global goal to achieve clean water and sanitation for all people by 2030

Sustainable Development Goal 6 declares the importance of achieving "clean water and sanitation for all". It is one of the 17 Sustainable Development Goals established by the United Nations General Assembly to succeed the former Millennium Development Goals (MDGs). According to the United Nations, the overall goal is to: "Ensure availability and sustainable management of water and sanitation for all." The goal has eight targets to be achieved by 2030 covering the main areas of water supply and sanitation and sustainable water resource management. Progress toward the targets will be measured by using eleven indicators.

<span class="mw-page-title-main">Fresh water</span> Naturally occurring water with low amounts of dissolved salts

Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. The term excludes seawater and brackish water, but it does include non-salty mineral-rich waters, such as chalybeate springs. Fresh water may encompass frozen and meltwater in ice sheets, ice caps, glaciers, snowfields and icebergs, natural precipitations such as rainfall, snowfall, hail/sleet and graupel, and surface runoffs that form inland bodies of water such as wetlands, ponds, lakes, rivers, streams, as well as groundwater contained in aquifers, subterranean rivers and lakes.

References

  1. ↑ "Strains on freshwater resources". Atlas of Sustainable Development Goals 2023. Retrieved 2024-05-19.
  2. ↑ "Earth's water distribution". United States Geological Survey. Retrieved 2009-05-13.
  3. ↑ "Scientific Facts on Water: State of the Resource". GreenFacts Website. Retrieved 2008-01-31.
  4. ↑ "The World's Water 2006–2007 Tables, Pacific Institute". Worldwater.org. Retrieved 2009-03-12.
  5. ↑ Pulitzer Center on Crisis Reporting Archived July 23, 2009, at the Wayback Machine
  6. ↑ "What is Groundwater? | International Groundwater Resources Assessment Centre". www.un-igrac.org. Retrieved 2022-03-14.
  7. ↑ Shafeian, Nafise; Ranjbar, A.A.; Gorji, Tahereh B. (June 2022). "Progress in atmospheric water generation systems: A review". Renewable and Sustainable Energy Reviews. 161: 112325. doi:10.1016/j.rser.2022.112325. S2CID   247689027.
  8. ↑ Jarimi, Hasila; Powell, Richard; Riffat, Saffa (18 May 2020). "Review of sustainable methods for atmospheric water harvesting". International Journal of Low-Carbon Technologies. 15 (2): 253–276. doi: 10.1093/ijlct/ctz072 .
  9. ↑ Raveesh, G.; Goyal, R.; Tyagi, S.K. (July 2021). "Advances in atmospheric water generation technologies". Energy Conversion and Management. 239: 114226. Bibcode:2021ECM...23914226R. doi:10.1016/j.enconman.2021.114226. S2CID   236264708.
  10. ↑ van Vliet, Michelle T H; Jones, Edward R; Flörke, Martina; Franssen, Wietse H P; Hanasaki, Naota; Wada, Yoshihide; Yearsley, John R (2021-02-01). "Global water scarcity including surface water quality and expansions of clean water technologies". Environmental Research Letters. 16 (2): 024020. Bibcode:2021ERL....16b4020V. doi: 10.1088/1748-9326/abbfc3 . ISSN   1748-9326.
  11. ↑ Tuser, Cristina (May 24, 2022). "What is potable reuse?". Wastewater Digest. Retrieved 2022-08-29.
  12. ↑ Andersson, K., Rosemarin, A., Lamizana, B., Kvarnström, E., McConville, J., Seidu, R., Dickin, S. and Trimmer, C. (2016). Sanitation, Wastewater Management and Sustainability: from Waste Disposal to Resource Recovery. Nairobi and Stockholm: United Nations Environment Programme and Stockholm Environment Institute. ISBN   978-92-807-3488-1
  13. ↑ Warsinger, David M.; Chakraborty, Sudip; Tow, Emily W.; Plumlee, Megan H.; Bellona, Christopher; Loutatidou, Savvina; Karimi, Leila; Mikelonis, Anne M.; Achilli, Andrea; Ghassemi, Abbas; Padhye, Lokesh P.; Snyder, Shane A.; Curcio, Stefano; Vecitis, Chad D.; Arafat, Hassan A.; Lienhard, John H. (2018). "A review of polymeric membranes and processes for potable water reuse". Progress in Polymer Science. 81: 209–237. doi:10.1016/j.progpolymsci.2018.01.004. ISSN   0079-6700. PMC   6011836 . PMID   29937599.
  14. ↑ Takman, Maria; Svahn, Ola; Paul, Catherine; Cimbritz, Michael; Blomqvist, Stefan; Struckmann Poulsen, Jan; Lund Nielsen, Jeppe; Davidsson, Åsa (2023-10-15). "Assessing the potential of a membrane bioreactor and granular activated carbon process for wastewater reuse – A full-scale WWTP operated over one year in Scania, Sweden". Science of the Total Environment. 895: 165185. Bibcode:2023ScTEn.89565185T. doi: 10.1016/j.scitotenv.2023.165185 . ISSN   0048-9697. PMID   37385512.
  15. ↑ "Desalination" (definition), The American Heritage Science Dictionary, via dictionary.com. Retrieved August 19, 2007.
  16. ↑ Panagopoulos, Argyris; Haralambous, Katherine-Joanne; Loizidou, Maria (2019-11-25). "Desalination brine disposal methods and treatment technologies – A review". The Science of the Total Environment. 693: 133545. Bibcode:2019ScTEn.69333545P. doi:10.1016/j.scitotenv.2019.07.351. ISSN   1879-1026. PMID   31374511. S2CID   199387639.
  17. ↑ Fischetti, Mark (September 2007). "Fresh from the Sea". Scientific American. 297 (3): 118–119. Bibcode:2007SciAm.297c.118F. doi:10.1038/scientificamerican0907-118. PMID   17784633.
  18. ↑ Ebrahimi, Atieh; Najafpour, Ghasem D; Yousefi Kebria, Daryoush (2019). "Performance of microbial desalination cell for salt removal and energy generation using different catholyte solutions". Desalination. 432: 1. doi:10.1016/j.desal.2018.01.002.
  19. ↑ "Making the Deserts Bloom: Harnessing nature to deliver us from drought, Distillations Podcast and transcript, Episode 239". Science History Institute. March 19, 2019. Retrieved 27 August 2019.
  20. ↑ Elsaid, Khaled; Kamil, Mohammed; Sayed, Enas Taha; Abdelkareem, Mohammad Ali; Wilberforce, Tabbi; Olabi, A. (2020). "Environmental impact of desalination technologies: A review". Science of the Total Environment . 748: 141528. Bibcode:2020ScTEn.74841528E. doi:10.1016/j.scitotenv.2020.141528. PMID   32818886.
  21. ↑ Cohen, Yoram (2021). "Advances in Water Desalination Technologies". Materials and Energy. Vol. 17. WORLD SCIENTIFIC. doi:10.1142/12009. ISBN   978-981-12-2697-7. ISSN   2335-6596. S2CID   224974880.
  22. ↑ Alix, Alexandre; Bellet, Laurent; Trommsdorff, Corinne; Audureau, Iris, eds. (2022). Reducing the Greenhouse Gas Emissions of Water and Sanitation Services: Overview of emissions and their potential reduction illustrated by utility know-how. IWA Publishing. doi:10.2166/9781789063172. ISBN   978-1-78906-317-2. S2CID   250128707.
  23. 1 2 3 Rahman, Afeefa; Kumar, Praveen; Dominguez, Francina (6 December 2022). "Increasing freshwater supply to sustainably address global water security at scale". Scientific Reports. 12 (1): 20262. Bibcode:2022NatSR..1220262R. doi: 10.1038/s41598-022-24314-2 . ISSN   2045-2322. PMC   9726751 . PMID   36473864.
  24. ↑ McDonald, Bob. "Water, water, everywhere — and maybe here's how to make it drinkable" . Retrieved 17 January 2023.
  25. ↑ Yirka, Bob. "Model suggests a billion people could get safe drinking water from hypothetical harvesting device". Tech Xplore. Retrieved 15 November 2021.
  26. ↑ "Solar-powered harvesters could produce clean water for one billion people". Physics World. 13 November 2021. Retrieved 15 November 2021.
  27. ↑ Lord, Jackson; Thomas, Ashley; Treat, Neil; Forkin, Matthew; Bain, Robert; Dulac, Pierre; Behroozi, Cyrus H.; Mamutov, Tilek; Fongheiser, Jillia; Kobilansky, Nicole; Washburn, Shane; Truesdell, Claudia; Lee, Clare; Schmaelzle, Philipp H. (October 2021). "Global potential for harvesting drinking water from air using solar energy". Nature. 598 (7882): 611–617. Bibcode:2021Natur.598..611L. doi:10.1038/s41586-021-03900-w. ISSN   1476-4687. PMC   8550973 . PMID   34707305.
  28. ↑ Snyder, R. L.; Melo-Abreu, J. P. (2005). Frost protection: fundamentals, practice, and economics. Vol. 1. Food and Agriculture Organization of the United Nations. ISBN   978-92-5-105328-7. ISSN   1684-8241.
  29. 1 2 WHO, UNICEF (2017). Progress on drinking water, sanitation and hygiene : 2017 update and SDG baselines. Geneva. ISBN   978-9241512893. OCLC   1010983346.{{cite book}}: CS1 maint: location missing publisher (link)
  30. ↑ "Global WASH Fast Facts | Global Water, Sanitation and Hygiene | Healthy Water | CDC". www.cdc.gov. 2018-11-09. Retrieved 2019-04-09.
  31. ↑ Water Aid. "Water". Archived from the original on 16 April 2013. Retrieved 17 March 2012.
  32. 1 2 Caretta, M.A., A. Mukherji, M. Arfanuzzaman, R.A. Betts, A. Gelfan, Y. Hirabayashi, T.K. Lissner, J. Liu, E. Lopez Gunn, R. Morgan, S. Mwanga, and S. Supratid, 2022: Chapter 4: Water. In: Climate Change 2022: Impacts, Adaptation and Vulnerability. Contribution of Working Group II to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change [H.-O. Pörtner, D.C. Roberts, M. Tignor, E.S. Poloczanska, K. Mintenbeck, A. Alegría, M. Craig, S. Langsdorf, S. Löschke, V. Möller, A. Okem, B. Rama (eds.)]. Cambridge University Press, Cambridge, UK and New York, NY, USA, pp. 551–712, doi:10.1017/9781009325844.006.
  33. ↑ Rijsberman, Frank R. (2006). "Water scarcity: Fact or fiction?". Agricultural Water Management. 80 (1–3): 5–22. Bibcode:2006AgWM...80....5R. doi:10.1016/j.agwat.2005.07.001.
  34. ↑ IWMI (2007) Water for Food, Water for Life: A Comprehensive Assessment of Water Management in Agriculture . London: Earthscan, and Colombo: International Water Management Institute.
  35. ↑ Von Sperling, Marcos (2007). "Wastewater Characteristics, Treatment and Disposal". Water Intelligence Online. Biological Wastewater Treatment. 6. IWA Publishing. doi: 10.2166/9781780402086 . ISBN   978-1-78040-208-6.
  36. ↑ Eckenfelder Jr WW (2000). Kirk-Othmer Encyclopedia of Chemical Technology. John Wiley & Sons. doi:10.1002/0471238961.1615121205031105.a01. ISBN   978-0-471-48494-3.
  37. ↑ "Water Pollution". Environmental Health Education Program. Cambridge, MA: Harvard T.H. Chan School of Public Health. July 23, 2013. Archived from the original on September 18, 2021. Retrieved September 18, 2021.
  38. ↑ "In Africa, War Over Water Looms As Ethiopia Nears Completion Of Nile River Dam". NPR . 27 February 2018.
  39. ↑ Tulloch, James (August 26, 2009). "Water Conflicts: Fight or Flight?". Allianz. Archived from the original on 2008-08-29. Retrieved 14 January 2010.
  40. ↑ Kameri-Mbote, Patricia (January 2007). "Water, Conflict, and Cooperation: Lessons from the nile river Basin" (PDF). Navigating Peace (4). Woodrow Wilson International Center for Scholars. Archived from the original (PDF) on 2010-07-06.
  41. ↑ United Nations Potential Conflict to Cooperation Potential, accessed November 21, 2008
  42. ↑ Peter Gleick, 1993. "Water and conflict." International Security Vol. 18, No. 1, pp. 79-112 (Summer 1993).
  43. ↑ Heidelberg Institute for International Conflict Research (Department of Political Science, University of Heidelberg); Conflict Barometer 2007:Crises – Wars – Coups d'État – Nagotiations – Mediations – Peace Settlements, 16th annual conflict analysis, 2007
  44. ↑ "Flooding and Climate Change: Everything You Need to Know". www.nrdc.org. 2019-04-10. Retrieved 2023-07-11.
  45. ↑ Petersen-Perlman, Jacob D.; Aguilar-Barajas, Ismael; Megdal, Sharon B. (2022-08-01). "Drought and groundwater management: Interconnections, challenges, and policyresponses". Current Opinion in Environmental Science & Health. 28: 100364. Bibcode:2022COESH..2800364P. doi: 10.1016/j.coesh.2022.100364 . ISSN   2468-5844.
  46. ↑ Caretta, M.A., A. Mukherji, M. Arfanuzzaman, R.A. Betts, A. Gelfan, Y. Hirabayashi, T.K. Lissner, J. Liu, E. Lopez Gunn, R. Morgan, S. Mwanga, and S. Supratid, 2022: Chapter 4: Water. In: Climate Change 2022: Impacts, Adaptation and Vulnerability. Contribution of Working Group II to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change [H.-O. Pörtner, D.C. Roberts, M. Tignor, E.S. Poloczanska, K. Mintenbeck, A. Alegría, M. Craig, S. Langsdorf, S. Löschke, V. Möller, A. Okem, B. Rama (eds.)]. Cambridge University Press, Cambridge, UK and New York, NY, USA, pp. 551–712, doi:10.1017/9781009325844.006.
  47. ↑ Harvey, Chelsea. "Glaciers May Melt Even Faster Than Expected, Study Finds". Scientific American. Retrieved 2023-07-11.
  48. ↑ Gleeson, Tom; Wada, Yoshihide; Bierkens, Marc F. P.; van Beek, Ludovicus P. H. (9 August 2012). "Water balance of global aquifers revealed by groundwater footprint". Nature . 488 (7410): 197–200. Bibcode:2012Natur.488..197G. doi:10.1038/nature11295. PMID   22874965. S2CID   4393813.
  49. ↑ Liu, Pang-Wei; Famiglietti, James S.; Purdy, Adam J.; Adams, Kyra H.; et al. (19 December 2022). "Groundwater depletion in California's Central Valley accelerates during megadrought". Nature Communications. 13 (7825): 7825. Bibcode:2022NatCo..13.7825L. doi: 10.1038/s41467-022-35582-x . PMC   9763392 . PMID   36535940. (Archive of chart itself)
  50. ↑ Ritchie, Roser, Mispy, Ortiz-Ospina (2018) "Measuring progress towards the Sustainable Development Goals." (SDG 6) SDG-Tracker.org, website
  51. ↑ United Nations (2017) Resolution adopted by the General Assembly on 6 July 2017, Work of the Statistical Commission pertaining to the 2030 Agenda for Sustainable Development (A/RES/71/313)
  52. ↑ "International Decade for Action 'Water for Life' 2005-2015. Focus Areas: Integrated Water Resources Management (IWRM)". www.un.org. Retrieved 2020-11-18.
  53. ↑ Sadoff, Claudia; Grey, David; Borgomeo, Edoardo (2020). "Water Security". Oxford Research Encyclopedia of Environmental Science. doi:10.1093/acrefore/9780199389414.013.609. ISBN   978-0-19-938941-4.
  54. 1 2 3 Rahaman, Muhammad Mizanur; Varis, Olli (April 2005). "Integrated water resources management: evolution, prospects and future challenges". Sustainability: Science, Practice and Policy. 1 (1): 15–21. Bibcode:2005SSPP....1...15R. doi: 10.1080/15487733.2005.11907961 . ISSN   1548-7733. S2CID   10057051.
  55. ↑ Asit K.B. (2004). Integrated Water Resources Management: A Reassessment, Water International, 29(2), 251
  56. ↑ "Integrated Water Resources Management: Basic Concepts | IWA Publishing". www.iwapublishing.com. Retrieved 2020-11-18.
  57. ↑ Ibisch, Ralf B.; Bogardi, Janos J.; Borchardt, Dietrich (2016), Borchardt, Dietrich; Bogardi, Janos J.; Ibisch, Ralf B. (eds.), Integrated Water Resources Management: Concept, Research and Implementation, Cham: Springer International Publishing, pp. 3–32, doi:10.1007/978-3-319-25071-7_1, ISBN   978-3-319-25069-4 , retrieved 2020-11-14
  58. ↑ Hülsmann, Stephan; Ardakanian, Reza, eds. (2018). Managing Water, Soil and Waste Resources to Achieve Sustainable Development Goals. Cham: Springer International Publishing. doi:10.1007/978-3-319-75163-4. ISBN   978-3-319-75162-7. S2CID   135441230.
  59. ↑ Jonathan Parkinson; J. A. Goldenfum; Carlos E. M. Tucci, eds. (2010). Integrated urban water management : humid tropics. Boca Raton: CRC Press. p. 2. ISBN   978-0-203-88117-0. OCLC   671648461.
  60. ↑ Barton, A.B. (2009). "Advancing IUWM through an understanding of the urban water balance". Australia's Commonwealth Scientific and Industrial Research Organisation (CSIRO). Archived from the original on 2008-03-24. Retrieved 2009-09-14.
  61. 1 2 Behzadian, K; Kapelan, Z (2015). "Advantages of integrated and sustainability based assessment for metabolism based strategic planning of urban water systems" (PDF). Science of the Total Environment. 527–528: 220–231. Bibcode:2015ScTEn.527..220B. doi:10.1016/j.scitotenv.2015.04.097. hdl: 10871/17351 . PMID   25965035.
  62. ↑ Behzadian, k; Kapelan, Z (2015). "Modelling metabolism based performance of an urban water system using WaterMet2" (PDF). Resources, Conservation and Recycling. 99: 84–99. doi:10.1016/j.resconrec.2015.03.015. hdl: 10871/17108 .
  63. ↑ "Water Resources". www.usgs.gov. Retrieved 2021-09-17.
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