Water security

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Communal tap (standpost) for drinking water in Soweto, Johannesburg, South Africa (2941729790).jpg
Kampala Flooding.jpg
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Water security has many different aspects: a communal tap for water supply in Soweto, South Africa; residents standing in flood water in Kampala, Uganda; water pollution can lead to eutrophication, harmful algal blooms and fish kills; the town of Farina in South Australia abandoned due to years of drought and dust storms.

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. [1] [2] These risks include for example too much water (flood), too little water (drought and water scarcity) or poor quality (polluted) water. [1] 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". [2] For example, access to water, sanitation and hygiene services is one part of water security. [3] Some organizations use the term water security more narrowly for water supply aspects only.

Contents

Decision makers and water managers aim to reach water security goals that address multiple concerns. These outcomes can include increasing economic and social well-being while reducing risks tied to water. [4] There are linkages and trade-offs between the different outcomes. [3] : 13  Planners often consider water security effects for varied groups when they design climate change reduction strategies. [5] : 19–21 

Three main factors determine how difficult or easy it is for a society to sustain its water security. These include the hydrologic environment, the socio-economic environment, and future changes due to the effects of climate change. [1] Decision makers may assess water security risks at varied levels. These range from the household to community, city, basin, country and region. [3] : 11 

The opposite of water security is water insecurity. [6] : 5  Water insecurity is a growing threat to societies. [7] : 4  The main factors contributing to water insecurity are water scarcity, water pollution and low water quality due to climate change impacts. Others include poverty, destructive forces of water, and disasters that stem from natural hazards. Climate change affects water security in many ways. Changing rainfall patterns, including droughts, can have a big impact on water availability. Flooding can worsen water quality. Stronger storms can damage infrastructure, especially in the Global South. [8] : 660 

There are different ways to deal with water insecurity. Science and engineering approaches can increase the water supply or make water use more efficient. Financial and economic tools can include a safety net to ensure access for poorer people. Management tools such as demand caps can improve water security. [7] : 16  They work on strengthening institutions and information flows. They may also improve water quality management, and increase investment in water infrastructure. Improving the climate resilience of water and hygiene services is important. These efforts help to reduce poverty and achieve sustainable development. [2]

There is no single method to measure water security. [8] : 562  Metrics of water security roughly fall into two groups. This includes those that are based on experiences versus metrics that are based on resources. The former mainly focus on measuring the water experiences of households and human well-being. The latter tend to focus on freshwater stores or water resources security. [9]

The IPCC Sixth Assessment Report found that increasing weather and climate extreme events have exposed millions of people to acute food insecurity and reduced water security. Scientists have observed the largest impacts in Africa, Asia, Central and South America, Small Islands and the Arctic. [10] : 9   The report predicted that global warming of 2 °C would expose roughly 1-4 billion people to water stress. It finds 1.5-2.5 billion people live in areas exposed to water scarcity. [10] : 660 

Definitions

Broad definition

There are various definitions for the term water security. [11] [12] : 5  It emerged as a concept in the 21st century. It is broader than the absence of water scarcity. [1] It differs from the concepts of food security and energy security. Whereas those concepts cover reliable access to food or energy, water security covers not only the absence of water but also its presence when there is too much of it. [2]

One definition of water security is "the reliable availability of an acceptable quantity and quality of water for health, livelihoods and production, coupled with an acceptable level of water-related risks". [2]

A similar definition of water security by UN-Water is: "the capacity of a population to safeguard sustainable access to adequate quantities of acceptable quality water for sustaining livelihoods, human well-being, and socio-economic development, for ensuring protection against water-borne pollution and water-related disasters, and for preserving ecosystems in a climate of peace and political stability." [11] : 1  [13]

World Resources Institute also gave a similar definition in 2020. "For purposes of this report, we define water security as the capacity of a population to

Narrower definition with a focus on water supply

Some organizations use water security in a more specific sense to refer to water supply only. They do not consider the water-related risks of too much water. For example, the definition of WaterAid in 2012 focuses on water supply issues. They defined water security as "reliable access to water of sufficient quantity and quality for basic human needs, small-scale livelihoods and local ecosystem services, coupled with a well managed risk of water-related disasters". [11] : 5  The World Water Council also uses this more specific approach with a focus on water supply. "Water security refers to the availability of water, in adequate quantity and quality, to sustain all these needs together (social and economic sectors, as well as the larger needs of the planet's ecosystems) – without exceeding its ability to renew." [14] [15]

Relationship with WASH and IWRM

WASH (water, sanitation and hygiene) is an important concept when in discussions of water security. Access to WASH services is one part of achieving water security. [3] The relationship works both ways. To be sustainable, WASH services need to address water security issues. [16] : 4  For example WASH relies on water resources that are part of the water cycle. But climate change has many impacts on the water cycle which can threaten water security. [11] : vII  There is also growing competition for water. This reduces the availability of water resources in many areas in the world. [16] : 4 

Water security incorporates ideas and concepts to do with the sustainability, integration and adaptiveness of water resource management. [17] [4] In the past, experts used terms such as integrated water resources management (IWRM) or sustainable water management for this.

Water risk

Water risk refers to the possibility of problems to do with water. Examples are water scarcity, water stress, flooding, infrastructure decay and drought. [18] : 4  There exists an inverse relationship between water risk and water security. This means as water risk increases, water security decreases. Water risk is complex and multilayered. It includes risks flooding and drought. These can lead to infrastructure failure and worsen hunger. [19] When these disasters take place, they result in water scarcity or other problems. The potential economic effects of water risk are important to note. Water risks threaten entire industries. Examples are the food and beverage sector, agriculture, oil and gas and utilities. Agriculture uses 69% of total freshwater in the world. So this industry is very vulnerable to water stress. [20]

Risk is a combination of hazard, exposure and vulnerability. [4] Examples of hazards are droughts, floods and decline in quality. Bad infrastructure and bad governance lead to high exposure to risk.

The financial sector is becoming more aware of the potential impacts of water risk and the need for its proper management. By 2025, water risk will threaten $145 trillion in assets under management. [21]

To control water risk, companies can develop water risk management plans. [19] Stakeholders within financial markets can use these plans to measure company environmental, social and governance (ESG) performance. They can then identify leaders in water risk management. [22] [20] The World Resources Institute has developed an online water data platform named Aqueduct for risk assessment and water management. China Water Risk is a nonprofit dedicated to understanding and managing water risk in China. The World Wildlife Fund has a Water Risk Filter that helps companies assess and respond to water risk with scenarios for 2030 and 2050. [23]

Understanding risk is part of water security policy. But it is also important to take social equity considerations more into account. [24]

There is no wholly accepted theory or mathematical model for determining or managing water risk. [3] : 13  Instead, managers use a range of theories, models and technologies to understand the trade-offs that exist in responding to risk.

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. [26] [27] The United Nations recognizes that water disputes result from opposing interests of water users, public or private. [28] A wide range of water conflicts appear throughout history, though they are rarely traditional wars waged over water alone. [29] 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. [30]

Water conflicts can occur on the intrastate and interstate levels. Interstate conflicts occur between two or more countries that share a transboundary water source, such as a river, sea, or groundwater basin. For example, the Middle East has only 1% of the world's fresh water shared among 5% of the world's population and most of the rivers cross international borders. [31] Intrastate conflicts take place between two or more parties in the same country, such as conflicts between farmers and urban water users.

Desired outcomes

There are three groups of water security outcomes. These include economic, environmental and equity (or social) outcomes. [1] Outcomes are things that happen or people would want to see happen as a result of policy and management:

There are four major focus areas for water security and its outcomes. It is about using water to increase economic and social welfare, move towards long-term sustainability or reduce risks tied to water. [4] Decision makers and water managers must consider the linkages and trade-offs between the varied types of outcomes. [3] : 13 

Improving water security is a key factor to achieve growth, development that is sustainable and reduce poverty. [2] Water security is also about social justice and fair distribution of environmental benefits and harms. [34] Development that is sustainable can help reduce poverty and increase living standards. This is most likely to benefit those affected by the impacts of insecure water resources in the region, especially women and children.

Water security is important for attaining most of the 17 United Nations Sustainable Development Goals (SDGs). This is because access to adequate and safe water is a precondition for meeting many of the individual goals. [8] : 4–8  It is also important for attaining development that is resilient to climate change. [8] : 4–7  Planners take note of water security outcomes for various groups in society when they design strategies for climate change adaptation. [3] : 19–21 

Determining factors

Three main factors determine the ability of a society to sustain water security: [2]

  1. Hydrologic environment
  2. Socio-economic environment
  3. Changes in the future environment (due to the effects of climate change)

Hydrologic environment

The hydrologic environment is important for water security. The term hydrologic environment refers to the "absolute level of water resource availability". But it also refers to how much it varies in time and location. Inter-annual means from one year to the next, Intra-annual means from one season to the next. It is possible to refer to location as spatial distribution. [2] Scholars distinguish between a hydrologic environment that is easy to manage and one that is difficult. [2]

An easy to manage hydrologic environment would be one with low rainfall variability. In this case rain is distributed throughout the year and perennial river flows sustained by groundwater base flows. For example, many of the world's industrialized nations have a hydrologic environment that they can manage quite easily. This has helped them achieve water security early in their development. [2]

A difficult to manage hydrologic environment is one with absolute water scarcity such as deserts or low-lying lands prone to severe flood risk. Regions where rainfall is very variable from one season to the next, or regions where rainfall varies a lot from one year to the next are also likely to face water security challenges. The term for this is high inter-annual climate variability. An example would be East Africa, where there have been prolonged droughts every two to three years since 1999. [35] Most of the world's developing countries have challenges in managing hydrologies and have not achieved water security. This is not a coincidence. [2]

The poverty and hydrology hypothesis states that regions with a difficult hydrology remain poor because the respective governments have not been able to make the large investments necessary to achieve water security. Examples of such regions would be those with rainfall variability within one year and across several years. This leads to water insecurity which constrains economic growth. [2] There is a statistical link between increased changes in rainfall patterns and lower per capita incomes. [36]

Socio-economic environment

Relative levels of economic development and equality or inequality are strong determinants of community and household scale water security. Whilst the poverty and hydrology hypothesis suggests that there is a link between poverty and difficult hydrologies, there are many examples of "difficult hydrologies" that have not (yet) resulted in poverty and water insecurity. [2] [37]

Social and economic inequalities are strong drivers of water insecurity, especially at the community and household scales. Gender, race and caste inequalities have all been linked to differential access to water services such as drinking water and sanitation. In particular women and girls frequently have less access to economic and social opportunities as a directly consequence of being primarily responsible for meeting household water needs. The entire journey from water source to point of use is fraught with hazards largely faced by women and girls. [38] There is strong evidence that improving access to water and sanitation is a good way of addressing such inequalities.

Climate change

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. [39] Also droughts can alter the total amount of freshwater and cause a decline in groundwater storage, and reduction in groundwater recharge. [40] Reduction in water quality due to extreme events can also occur. [8] : 558  Faster melting of glaciers can also occur. [41]

Global climate change will probably make it more complex and expensive to ensure water security. [2] It creates new threats and adaptation challenges. [1] This is because climate change leads to increased hydrological variability and extremes. Climate change has many impacts on the water cycle. These result in higher climatic and hydrological variability, which can threaten water security. [11] : vII  Changes in the water cycle threaten existing and future water infrastructure. It will be harder to plan investments for future water infrastructure as there are so many uncertainties about future variability for the water cycle. [1] This makes societies more exposed to risks of extreme events linked to water and therefore reduces water security. [11] : vII 

It is difficult to predict the effects of climate change on national and local levels. Water security will be affected by sea level rise in low lying coastal areas while populations dependent on snowmelt as their water source will be affected by the recession of glaciers and mountain snow. [12] : 21 

Future climate change must be viewed in context of other existing challenges for water security. Other challenges existing climate variability in areas closer to the equator, population growth and increased demand for water resources. Others include political challenges, increased disaster exposure due to settlement in hazard-prone areas, and environmental degradation. [12] : 22  Water demand for irrigation in agriculture will increase due to climate change. This is because evaporation rates and the rate of water loss from crops will be higher due to rising temperatures. [7] : 4 

Climate factors have a major effect on water security as various levels. Geographic variability in water availability, reliability of rainfall and vulnerability to droughts, floods and cyclones are inherent hazards that affect development opportunities. These play out at international to intra-basin scales. At local scales, social vulnerability is a factor that increases the risks to water security, no matter the cause. [5] : 6  For example, people affected by poverty may have less ability to cope with climate shocks. [5]

Challenges and threats

There are many factors that contribute to low water security. Some examples are: [7] : 4  [6] : 9 

Water scarcity

A major threat to water security is water scarcity. About 27% of the world's population lived in areas affected by water scarcity in the mid-2010s. This number will likely increase to 42% by 2050. [42]

This section is an excerpt from Water scarcity.[ edit ]
Map of global water stress (a symptom of water scarcity) in 2019. Water stress is the ratio of water use relative to water availability and is therefore a demand-driven scarcity. Water stress 2019 WRI.png
Map of global water stress (a symptom of water scarcity) in 2019. Water stress is the ratio of water use relative to water availability and is therefore a demand-driven scarcity.

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. [44] : 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. [45] 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. [44] : 560  Many people in Sub-Saharan Africa are living with economic water scarcity. [46] : 11 

There is enough freshwater available globally and averaged over the year to meet demand. As such, water scarcity is caused by a mismatch between when and where people need water, and when and where it is available. [47] One of the main causes of the increase in global water demand is the increase in the number of people. Others are the rise in living conditions, changing diets (to more animal products), [48] and expansion of irrigated agriculture. [49] [50] Climate change (including droughts or floods), deforestation, water pollution and wasteful use of water can also mean there is not enough water. [51] These variations in scarcity may also be a function of prevailing economic policy and planning approaches.

Water pollution

Water pollution is a threat to water security. It can affect the supply of drinking water and indirectly contribute to water scarcity.

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. [52] : 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. [53] 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. [54] Water pollution also reduces the ecosystem services such as drinking water provided by the water resource.

Reduced water quality due to climate change

Drinking water quality framework: Environment (including weather events), infrastructure and management affect drinking water quality at the point of collection (PoC) and point of use (PoU). 1-s2.0-S0048969721069527-gr1 lrg.jpg
Drinking water quality framework: Environment (including weather events), infrastructure and management affect drinking water quality at the point of collection (PoC) and point of use (PoU).

Weather and its related shocks can affect water quality in several ways. These depend on the local climate and context. [55] Shocks that are linked to weather include water shortages, heavy rain and temperature extremes. They can damage water infrastructure through erosion under heavy rainfall and floods, cause loss of water sources in droughts, and make water quality deteriorate. [55]

Climate change can reduce lower water quality in several ways: [8] : 582 

Poverty

People in low-income countries are at greater risk of water insecurity and may also have less resources to mitigate it. This can result in human suffering, sustained poverty, constrained growth and social unrest. [2]

Food and water insecurity pose significant challenges for numerous individuals across the United States. Strategies employed by households in response to these pressing issues encompass labor intensive methods, such as melting ice, earning wages, and occasionally incurring debt, all aimed at water conservation. Additionally, families may turn to foraging for water-based plants and animals, seeking alternative sources of sustenance. Adjusting consumption patterns becomes imperative, involving the rationing of servings and prioritizing nutritional value, particularly for vulnerable members like small children. The phenomenon of substituting more expensive, nutritious food with cheaper alternatives is also observed. [62]

Furthermore, individuals may consume from sources considered "stigmatized" by society, such as urine or unfiltered water. Migration emerges as a viable option, with families fostering children to relatives outside famine zones and engaging in seasonal or permanent resettlement. In certain instances, resource preservation involves the challenging decision of abandoning specific family members. This is achieved through withholding resources from non-family members, prioritizing the health of some family members over others, and, in extreme cases, leaving individuals behind. As the climate changes, the impact of food and water insecurity is disproportionately felt, necessitating a re-evaluation of societal misconceptions about those making survival sacrifices. Larger entities, including the government and various organizations, extend assistance based on available resources, highlighting the importance of addressing information gaps in specific data. [62]

Destructive forces of water

Flooded roads in Ponce, Puerto Rico, a week after Hurricane Maria devastated the island (2017). Standing water in Ponce, Puerto Rico, poses health risks for its residents more than a week after Hurricane Maria devastated the island.jpg
Flooded roads in Ponce, Puerto Rico, a week after Hurricane Maria devastated the island (2017).

Water can cause large-scale destruction due to its huge power. [2] This destruction can result from sudden events. Examples are tsunamis, floods or landslides. Events that happen slowly over time such as erosion, desertification or water pollution can also cause destruction. [2]

Other threats

Other threats to water security include:

Management approaches

There are different ways to tackle water insecurity. Science and engineering approaches can increase the water supply or make water use more efficient. Financial and economic tools can be used as a safety net for poorer people. Higher prices may encourage more investments in water systems. Finally, management tools such as demand caps can improve water security. [7] : 16, 104  Decision makers invest in institutions, information flows and infrastructure to achieve a high level of water security. [1]

Investment decisions

Institutions

The right institutions are important to improve water security. [2] Institutions govern how decisions can promote or constrain water security outcomes for the poor. [3] Strengthening institutions might involve reallocating risks and duties between the state, market and communities in new ways. This can include performance-based models, development impact bonds, or blended finance from government, donors and users. These finance mechanisms are set up to work jointly with state, private sector and communities investors. [3] : 37 

Sustainable Development Goal 16 is about peace, justice and strong institutions. It recognizes that strong institutions are a necessary condition for sustainable development, including water security. [3] : 35 

Drinking water quality and water pollution are linked. But policymakers often do not address them in a comprehensive way. For example, pollution from industries is often not linked to drinking water quality in developing countries. [3] : 32  Keeping track of river, groundwater and wastewater is important. It can identify sources of contamination and guide targeted regulatory responses. The WHO has described water safety plans as the most effective means of maintaining a safe supply of drinking water to the public. [65]

Information flows

It is important for institutions to have access to information about water. This helps them with their planning and decision-making. [1] It also helps with tracking how accountable and effective policies are. Investments into climate information tools that are appropriate for the local context are useful. [5] : 59  They cover a wide range of temporal and spatial scales. They also respond to regional climate risks tied to water. [5] : 58 

Seasonal climate and hydrological forecasts can be useful to prepare for and reduce water security risks. They are especially useful if people can apply them at the local scale. [66] [67] Applying knowledge of how climate anomalies relate to each other over long distances can improve seasonal forecasts for specific regions. These teleconnections are correlations between patterns of rainfall, temperature, and wind speed between distant areas. They are caused by large-scale ocean and atmospheric circulation. [68] [69]

In regions where rainfall varies with the seasons and from year to year, water managers would like to have more accurate seasonal weather forecasts. In some locations the onset of seasonal rainfall is particularly hard to predict. This is because aspects of the climate system are difficult to describe with mathematical models. For example, the long rains in East Africa which fall March to May have been difficult to simulate with climate models. When climate models work well they can produce useful seasonal forecasts. [70] One reason for these difficulties is the complex topography of the area. [70] Improved understanding of atmospheric processes may allow climate scientists to provide more relevant and localized information to water managers on a seasonal timescale. They could also provide more detailed predictions for the effects of climate change on a longer timeframe. [71]

Annual rainfall pattern in two regions of Ethiopia. The lines represent observations (red dashed line) and model results (green line) in a climate model study of the region. Figure 6 from Dyer et al 2019.jpg
Annual rainfall pattern in two regions of Ethiopia. The lines represent observations (red dashed line) and model results (green line) in a climate model study of the region.

One example would be seasonal forecasts of rainfall in Ethiopia's Awash river basin. These may become more accurate by understanding better how sea surface temperatures in different ocean regions relate to rainfall patterns in this river basin. [69] At a larger regional scale, a better understanding of the relationship between pressure systems in the Indian Ocean and the South Atlantic on the one hand, and wind speeds and rainfall patterns in the Greater Horn of Africa on the other hand would be helpful. This kind of scientific analysis may contribute to improved representation of this region in climate models to assist development planning. [73] It could also guide people when they plan water allocation in the river basin or prepare emergency response plans for future events of water scarcity and flooding. [69]

Infrastructure

Water infrastructure serves to access, store, regulate, move and conserve water. Several assets carry out these functions. Natural assets are lakes, rivers, wetlands, aquifers, springs. Engineered assets are bulk water management infrastructure, such as dams. [2] Examples include: [1]

Public and private spending on water infrastructure and supporting institutions must be well balanced. They are likely to evolve over time. [2] This is important to avoid unplanned social and environmental costs from building new facilities.

For example, in the case of Africa, investments into groundwater use is an option to increase water security and for climate change adaptation. [74] Water security in African countries could benefit from the distribution of groundwater storage and recharge on the continent. Recharge is a process where water moves to groundwater. Many countries that have low recharge have substantial groundwater storage. Countries with low storage typically have high, regular recharge. [75]

Consideration of scales

People manage water security risks at different spatial scales. These range from the household to community, town, city, basin and region. [3] : 11  At the local scale, actors include county governments, schools, water user groups, local water providers and the private sector. At the next larger scale there are basin and national level actors. These actors help to identify any constraints with regards to policy, institutions and investments. Lastly, there are global actors such as the World Bank, UNICEF, FCDO, WHO and USAID. They help to develop suitable service delivery models. [3] : 11 

The physical geography of a country shows the correct scale that planners should use for managing water security risks. Even within a country, the hydrologic environment may vary a lot. See for example the variations in seasonal rainfall across Ethiopia.

Reducing inequalities in water security

Inequalities with regards to water security within a society have structural and historical roots. They can affect people at different scales. These range from the household, to the community, town, river basin or the region. [3] : 20  High risk social groups and regions can be identified during political debates but are often ignored. Water inequality is often tied to gender in low-income countries. At the household level, women are often the "water managers". But they have limited choices over water and related issues. [3] : 21 

Improving climate resilience of water and sanitation services

Many institutions are working to develop WASH services that are resilient to climate. [3] : 27, 37  [76] [77]

This section is an excerpt from WASH § Improving climate resilience.[ edit ]

Climate-resilient water services (or climate-resilient WASH) are services that provide access to high quality drinking water during all seasons and even during extreme weather events. [78] Climate resilience in general is the ability to recover from, or to mitigate vulnerability to, climate-related shocks such as floods and droughts. [79] Climate resilient development has become the new paradigm for sustainable development. This concept thus influences theory and practice across all sectors globally. [79] This is particularly true in the water sector, since water security is closely connected to climate change. On every continent, governments are now adopting policies for climate resilient economies. International frameworks such as the Paris Agreement and the Sustainable Development Goals are drivers for such initiatives. [79]

Several activities can improve water security and increase resilience to climate risks: Carrying out a detailed analysis of climate risk to make climate information relevant to specific users; developing metrics for monitoring climate resilience in water systems (this will help to track progress and guide investments for water security); and using new institutional models that improve water security. [80]

Climate resilient policies can be useful for allocating water, keeping in mind that less water may be available in future. This requires a good understanding of the current and future hydroclimatic situation. For example, a better understanding of future changes in climate variability leads to a better response to their possible impacts. [81]

To build climate resilience into water systems, people need to have access to climate information that is appropriate for their local context. [80] : 59  Climate information products are useful if they cover a wide range of temporal and spatial scales, and provide information on regional water-related climate risks. [80] : 58  For example, government staff need easy access to climate information to achieve better water management. [81]

Four important activities to achieve climate resilient WASH services include: First, a risk analysis is performed to look at possible implications of extreme weather events as well as preventive actions. [82] : 4  Such preventive actions can include for example elevating the infrastructure to be above expected flood levels. Secondly, managers assess the scope for reducing greenhouse gas emissions and put in place suitable options, e.g. using more renewable energy sources. Thirdly, the water utilities ensure that water sources and sanitation services are reliable at all times during the year, also during times of droughts and floods. Finally, the management and service delivery models are strengthened so that they can withstand a crisis. [82] : 5 

To put climate resilience into practice and to engage better with politicians, the following guide questions are useful: "resilience of what, to what, for whom, over what time frame, by whom and at what scale?". [79] For example, "resilience of what?" means thinking beyond infrastructure but to also include resilience of water resources, local institutions and water users. Another example is that "resilience for whom?" speaks about reducing vulnerability and preventing negative developments: Some top-down interventions that work around power and politics may undermine indigenous knowledge and compromise community resilience. [79]

Measurement tools

Aggregated global water security index, calculated using the aggregation of water availability, accessibility, safety and quality, and management indices. The value '0-1' (with the continuous color 'red to blue') represents 'low to high' security. World map of the aggregated global water security index (early 2010s).jpg
Aggregated global water security index, calculated using the aggregation of water availability, accessibility, safety and quality, and management indices. The value '0–1' (with the continuous color 'red to blue') represents 'low to high' security.

There is no single way to measure water security. [8] : 562  There are no standard indicators to measure water security. That is because it is a concept that focuses on outcomes. [1] The outcomes that are regard as important can change depending on the context and stakeholders.

Instead, it is common to compare relative levels of water security by using metrics for certain aspects of water security. [8] : 562  For example, the Global Water Security Index includes metrics on:

Scientists have been working on ways to measure water security at a variety of levels. The metrics roughly fall into two groups. There are those that are based on experiences versus metrics that are based on resources. The former mainly focus on measuring the experiences of households and human well-being. Meanwhile the latter focuses on the amount of available freshwater. [9]

The Household Water Insecurity Experiences (HWISE) Scale measures several components of water insecurity at the household level. These include adequacy, reliability, accessibility and safety. [84] This scale can help to identify vulnerable subpopulations and ensure resources are allocated to those in need. It can also measure how effective of water policies and projects are. [84]

Global estimates

The IPCC Sixth Assessment Report summarises the current and future water security trends. It says that increasing weather and extreme climate events have led to acute food insecurity and reduced water security for millions of people. The largest impacts are seen in Africa, Asia, Central and South America, Small Islands and the Arctic. [10] : 9 

The same report predicted that global warming of 2 °C would expose roughly 1-4 billion people to water stress. This would depend on regional patterns of climate change and the socio-economic scenarios. [8] : 558  On water scarcity which is one factor in water insecurity the report finds 1.5-2.5 billion people live water scarce areas. [10] : 660 

Water scarcity and water security are not always equal. There are regions with high water security even though they also experience water scarcity. Examples are parts of the United States, Australia and Southern Europe. This is due to efficient water services that have a high level of safety, quality, and accessibility. [83] [8] : 562  However, even in those regions, groups such as Indigenous peoples tend to have less access to water and face water insecurity at times. [8] : 562 

Country examples

Bangladesh

ISS052-E-590 - View of Bangladesh.jpg
Bangladesh DSC 0342 (3943502568).jpg
Too much water can also cause water insecurity. Left: Flooding in Bangladesh; right: People on an island in a flooded river in Bangladesh.

Risks to water security in Bangladesh include: [5] : 45 

The country experiences water security risks in the capital Dhaka as well as in the coastal region. [5] In Dhaka, monsoonal pulses can lead to urban flooding. This can pollute the water supply. [5] A number of processes and events cause water risks for about 20 million people in the coastal regions. These include aquifers that are getting saltier, seasonal water scarcity, fecal contamination, and flooding from the monsoon and from storm surges due to cyclones. [5] : 64 

Different types of floods occur in coastal Bangladesh. They are: river floods, tidal floods and storm surge floods due to tropical cyclones. [85] These floods can damage drinking water infrastructure. They can also lead to reduced water quality as well as losses in agricultural and fishery yields. [5] There is a link between water insecurity and poverty in the low-lying areas in the Ganges-Brahmaputra tidal delta plain. [85] Those low-lying areas are embanked areas in coastal Bangladesh.

The government has various programs to reduce risks for people who live in coastal communities. These programs also lead to increases in economic wellbeing. [85] Examples include the "Coastal Embankment Improvement Project" [86] by World Bank in 2013, the BlueGold project [87] in 2012, UNICEF's "Managed Aquifer Recharge" program in 2014 and the Bangladesh Delta Plan in 2014. [85] Such investments in water security aim to increase the continued use and upkeep of water facilities. They can help coastal communities to escape the poverty trap caused by water insecurity. [85]

A program called the "SafePani framework" focuses on how the state shares risks and responsibilities with service providers and communities. [5] This program aims to help decision makers to address climate risks through a process called climate resilient water safety planning. [5] The program is a cooperation between UNICEF and the Government of Bangladesh.

Ethiopia

Rainfall regimes vary across Ethiopia. Left figure: Annual average rainfall in mm/day with the interquartile range (25th-75th) of monthly rainfall in mm/day indicated by black contours (1981-2020). Right figure: Three rainfall zones in Ethiopia with different seasonal rainfall patterns. The green zone has two separate rainy seasons, and the red zone has a single peak in rainfall in Jun to September. Ethiopia rainfall and seasons.png
Rainfall regimes vary across Ethiopia. Left figure: Annual average rainfall in mm/day with the interquartile range (25th–75th) of monthly rainfall in mm/day indicated by black contours (1981–2020). Right figure: Three rainfall zones in Ethiopia with different seasonal rainfall patterns. The green zone has two separate rainy seasons, and the red zone has a single peak in rainfall in Jun to September.

Ethiopia has two main wet seasons per year. It rains in the spring and summer. These seasonal patterns of rainfall vary a lot across the country. [69] [89] Western Ethiopia has a seasonal rainfall pattern that is similar to the Sahel. It has rainfall from February to November (which is decreasing to the north), and has peak rainfall from June to September. Southern Ethiopia has a rainfall pattern similar to the one in East Africa. There are two distinct wet seasons every year, February to May, and October to November. [72] [89] Central and eastern Ethiopia has some rainfall between February and November, with a smaller peak in rainfall from March to May and a second higher peak from June to September. [89]

In 2022 Ethiopia had one of the most severe La Niña-induced droughts in the last forty years. It came about due to four consecutive rainy seasons which did not produce enough rain. [90] This drought increased water insecurity for more than 8 million pastoralists and agro-pastoralists in the Somali, Oromia, SNNP and South-West regions. About 7.2 million people needed food aid, and 4.4 million people needed help to access water. Food prices have increased a lot due to the drought conditions. Many people in the affected area have experienced food shortages due to the water insecurity situation. [90]

In the Awash basin in central Ethiopia floods and droughts are common. Agriculture in the basin is mainly rainfed (without irrigation systems). This applies to around 98% of total cropland as of 2012. So changes in rainfall patterns due to climate change will reduce economic activities in the basin. [91] Rainfall shocks have a direct impact on agriculture. A rainfall decrease in the Awash basin could lead to a 5% decline in the basin's overall GDP. The agricultural GDP could even drop by as much as 10%. [91]

Partnerships with the Awash Basin Development Office (AwBDO) and the Ministry of Water, Irrigation and Electricity (MoWIE) have led to the development of new models of water allocation in the Awash basin. This can improve water security for the 18.3 million residents in the basin. With this they will have enough water for their domestic, irrigation and industry needs. [5]

Kenya

Kenya ranked 46th out of 54 African countries in an assessment of water security in 2022. [92] Major water security issues in Kenya include drinking water safety, water scarcity, lack of water storage, poor wastewater treatment, and drought and flood. [92] Large-scale climate patterns influence the rainfall patterns in East Africa. Such climate patterns include the El Niño–Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD). Cooling in the Pacific Ocean during the La Niña phase of ENSO is linked with dryer conditions in Kenya. This can lead to drought as it did in 2016-17. On the other hand a warmer Western Indian Ocean due to a strong positive Indian Ocean Dipole caused extreme flooding in Kenya in 2020. [93]

Around 38% of Kenya's population and 70% of its livestock live in arid and semi-arid lands. [94] These areas have low rainfall which varies a lot from one season to the next. This means that surface water and groundwater resources vary a lot by location and time of year. Residents in Northern Kenya are seeing increased changes in rainfall patterns and more frequent droughts. [95] These changes affect livelihoods in this region where people have been living as migratory herders. They are used to herding livestock with a seasonal migration pattern. [95] More people are now settling in small urban centers, and there is increasing conflict over water and other resources. [96] Water insecurity is a feature of life for both settled and nomadic pastoralists. Women and children bear the burden for fetching water. [97]

Groundwater sources have great potential to improve water supply in Kenya. However, the use of groundwater is limited by low quality and knowledge, pumping too much groundwater, known as overdrafting, and salt water intrusion along coastal areas. [98] [99] Another challenge is the upkeep of groundwater infrastructure, mainly in rural areas. [100]

Ukraine

Russian forces have destroyed one-third of Ukraine’s freshwater storage since February 2022 to 2024. [101] Potable, industrial and irrigation water supplies have been cut across the south and east of the country. Occupation of the southern and eastern regions of Ukraine and destruction of the Kakhovka Reservoir have all but terminated irrigation. Irrigated cereals and technical crops are now unprofitable, even where practicable – not least because of the difficulty of selling and exporting the produce. The strategic development of irrigation should be based on optimal technology to minimize water costs and redesign cultivation systems, for example, by drip irrigation, diverse crop rotations and focus on vegetable farming, orchards, and viticulture. [101] [102]

See also

Related Research Articles

<span class="mw-page-title-main">Drought</span> Period with less precipitation than normal

A drought is a period of drier-than-normal conditions. A drought can last for days, months or years. Drought often has large impacts on the ecosystems and agriculture of affected regions, and causes harm to the local economy. Annual dry seasons in the tropics significantly increase the chances of a drought developing, with subsequent increased wildfire risks. Heat waves can significantly worsen drought conditions by increasing evapotranspiration. This dries out forests and other vegetation, and increases the amount of fuel for wildfires.

<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">Environmental issues in Africa</span>

African environmental problems are problems caused by the direct and indirect human impacts on the natural environment and affect humans and nearly all forms of life in Africa. Issues include deforestation, soil degradation, air pollution, water pollution, coastal erosion, garbage pollution, climate change, Oil spills, Biodiversity loss, and water scarcity. These issues result in environmental conflict and are connected to broader social struggles for democracy and sovereignty. The scarcity of climate adaptation techniques in Africa makes it the least resilient continent to climate change.

<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.

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. The remaining unfrozen freshwater is found mainly as groundwater, with only a small fraction present above ground or in the air. 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.

<span class="mw-page-title-main">WASH</span> Water, sanitation and hygiene services

WASH is a sector in development cooperation or within local governments that provides water, sanitation, and hygiene services to people. The main purposes of providing access to WASH services include achieving public health gains, implementing the human right to water and sanitation, reducing the burden of collecting drinking water for women, and improving education and health outcomes at schools and health facilities. Access to WASH services is also an important component of water security. Universal, affordable, and sustainable access to WASH is a key issue within international development and is the focus of the first two targets of Sustainable Development Goal 6. Targets 6.1 and 6.2 aim for equitable and accessible water and sanitation for all. In 2017, it was estimated that 2.3 billion people live without basic sanitation facilities, and 844 million people live without access to safe and clean drinking water. The acronym WASH is used widely by non-governmental organizations and aid agencies in developing countries.

<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 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">Climate change in Africa</span> Emissions, impacts and responses of the African continent related to climate change

Climate change in Africa is an increasingly serious threat as Africa is among the most vulnerable continents to the effects of climate change. Some sources even classify Africa as "the most vulnerable continent on Earth". Climate change and climate variability will likely reduce agricultural production, food security and water security. As a result, there will be negative consequences on people's lives and sustainable development in Africa.

<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.

<span class="mw-page-title-main">Climate change in Iraq</span> Emissions, impacts and responses of Iraq related to climate change

In Iraq, climate change has led to environmental impacts such as increasing temperatures, decreasing precipitation, land degradation, and water scarcity. Climate change poses numerous risks to human health, livelihoods, political stability, and the sustainable development of the nation. The combination of ecological factors, conflict, weak governance, and an impeded capacity to mitigate climate change, has made Iraq uniquely at risk to the negative effects of climate change, with the UN ranking them the 5th most vulnerable country to climate change. Rising temperatures, intensified droughts, declining precipitation, desertification, salinization, and the increasing prevalence of dust storms are challenges Iraq faces due in to the negative impacts of climate change. National and regional political instability and conflict have made it difficult to mitigate the effects of climate change, address transnational water management, and develop sustainably. Climate change has negatively impacted Iraq's population through loss of economic opportunity, food insecurity, water scarcity, and displacement.

<span class="mw-page-title-main">Climate change in Algeria</span>

Climate change in Algeria has wide-reaching effects on the country. Algeria was not a significant contributor to climate change, but, like other countries in the Middle East and North Africa (MENA) region, is expected to be among the most affected by climate change impacts. Because a large part of the country is in already hot and arid geographies, including part of the Sahara, already strong heat and water resource access challenges are expected to get worse. As early as 2014, scientists were attributing extreme heat waves to climate change in Algeria. Algeria was ranked 46th of countries in the 2020 Climate Change Performance Index.

<span class="mw-page-title-main">Climate change in Ghana</span>

Climate change in Ghana is impacting the people in Ghana in several ways as the country sits at the intersection of three hydro-climatic zones. Changes in rainfall, weather conditions and sea-level rise will affect the salinity of coastal waters. This is expected to negatively affect both farming and fisheries. Low precipitation, drought and wild fires are also some major effects associated with climate change in Ghana.

<span class="mw-page-title-main">Climate change in Kenya</span> Emissions, impacts and responses of Kenya related to climate change

Climate change is posing an increasing threat to global socioeconomic development and environmental sustainability. Developing countries with low adaptive capacity and high vulnerability to the phenomenon are disproportionately affected. Climate change in Kenya is increasingly impacting the lives of Kenya's citizens and the environment. Climate change has led to more frequent extreme weather events like droughts which last longer than usual, irregular and unpredictable rainfall, flooding and increasing temperatures.

<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. Although the term specifically excludes seawater and brackish water, 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. Fresh water is the water resource that is of the most and immediate use to humans.

<span class="mw-page-title-main">Climate change in Texas</span> Climate change in the US state of Texas

The climate in Texas is changing partially due to global warming and rising trends in greenhouse gas emissions. As of 2016, most area of Texas had already warmed by 1.5 °F (0.83 °C) since the previous century because of greenhouse gas emissions by the United States and other countries. Texas is expected to experience a wide range of environmental impacts from climate change in the United States, including rising sea levels, more frequent extreme weather events, and increasing pressure on water resources.

<span class="mw-page-title-main">Effects of climate change on the water cycle</span>

The effects of climate change on the water cycle are profound and have been described as an intensification or a strengthening of the water cycle. This effect has been observed since at least 1980. One example is when heavy rain events become even stronger. The effects of climate change on the water cycle have important negative effects on the availability of freshwater resources, as well as other water reservoirs such as oceans, ice sheets, the atmosphere and soil moisture. The water cycle is essential to life on Earth and plays a large role in the global climate system and ocean circulation. The warming of our planet is expected to be accompanied by changes in the water cycle for various reasons. For example, a warmer atmosphere can contain more water vapor which has effects on evaporation and rainfall.

<span class="mw-page-title-main">Climate change in Ethiopia</span> Emissions, impacts and responses of Ethiopia related to climate change

Climate change in Ethiopia is affecting the people in Ethiopia due to increased floods, heat waves and infectious diseases. In the Awash basin in central Ethiopia floods and droughts are common. Agriculture in the basin is mainly rainfed. This applies to around 98% of total cropland as of 2012. So changes in rainfall patterns due to climate change will reduce economic activities in the basin. Rainfall shocks have a direct impact on agriculture. A rainfall decrease in the Awash basin could lead to a 5% decline in the basin's overall GDP. The agricultural GDP could even drop by as much as 10%.

Ghana became a party to the UNFCCC in September 1995, and ratified the Paris Agreement in September 2016. As a party to the Paris Agreement, Ghana is expected to develop a National Adaptation Plan, that outlines strategies the country is taking to adjust to the changing climatic conditions.

<span class="mw-page-title-main">Climate change in Malawi</span>

Malawi is a land-locked country in southeastern Africa situated along the southernmost arm of the East African Rift-Valley System between latitudes 9°22’ and 17°03’ south of the equator, and longitudes 33°40’ and 35°55’ east of the Greenwich meridian. It shares borders with Tanzania in the north and northeast, Mozambique in the southwest, south, and east, and Zambia in the west. Malawi is highly vulnerable to the effects of climate change as the vast majority of Malawians rely on small-scale, rain-fed agriculture, making them highly dependent on weather patterns. Climate change increasingly exacerbates droughts, flooding, and inconsistent rainfall—contributing to food insecurity and threatening to derail progress toward Malawi's goal of self-reliance.

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