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71-558: The Lesotho Highlands Water Project ( LHWP ) is an ongoing water supply project with a hydropower component, developed in partnership between the governments of Lesotho and South Africa . It comprises a system of several large dams and tunnels throughout Lesotho and delivers water to the Vaal River System in South Africa . In Lesotho, it involves the rivers Malibamatso , Matsoku , Senqunyane , and Senqu . It

142-471: A 12 mm pipe, plus ball valve, and then supply the house on 22 or 28 mm pipes. Gravity water has a small pressure (say 1 ⁄ 4 bar in the bathroom) so needs wide pipes to allow for higher flows. This is fine for baths and toilets but is frequently inadequate for showers. A booster pump or a hydrophore is installed to increase and maintain pressure. For this reason urban houses are increasingly using mains pressure boilers ("combies") which take

213-666: A Ministry of Public Works (such as in Ecuador and Haiti ), a Ministry of Economy (such as in German states) or a Ministry of Energy (such as in Iran ). A few countries, such as Jordan and Bolivia , even have a Ministry of Water. Often several Ministries share responsibilities for water supply. In the European Union, important policy functions have been entrusted to the supranational level. Policy and regulatory functions include

284-714: A brass foundry in Rotherham . The first documented use of sand filters to purify the water supply dates to 1804, when the owner of a bleachery in Paisley, Scotland , John Gibb, installed an experimental filter, selling his unwanted surplus to the public. The first treated public water supply in the world was installed by engineer James Simpson for the Chelsea Waterworks Company in London in 1829. The practice of water treatment soon became mainstream, and

355-566: A component of effective policy for health protection." In 1990, only 76 percent of the global population had access to drinking water. By 2015 that number had increased to 91 percent. In 1990, most countries in Latin America, East and South Asia, and Sub-Saharan Africa were well below 90%. In Sub-Saharan Africa, where the rates are lowest, household access ranges from 40 to 80 percent. Countries that experience violent conflict can have reductions in drinking water access: One study found that

426-611: A conflict with about 2,500 battle deaths deprives 1.8% of the population of potable water. Typically in developed countries , tap water meets drinking water quality standards , even though only a small proportion is actually consumed or used in food preparation. Other typical uses for tap water include washing, toilets, and irrigation . Greywater may also be used for toilets or irrigation. Its use for irrigation however may be associated with risks. Throughout history, people have devised systems to make getting and using water more convenient. Living in semi-arid regions, ancient Persians in

497-493: A consumption level of 15 cubic meters per month. Few utilities do recover all their costs. According to the same World Bank study only 30% of utilities globally, and only 50% of utilities in developed countries, generate sufficient revenue to cover operation, maintenance and partial capital costs. According to another study undertaken in 2006 by NUS Consulting, the average water and sewerage tariff in 14 mainly OECD countries excluding VAT varied between US$ 0.66 per cubic meter in

568-634: A dam in the location were spearheaded by then British High Commissioner Sir Evelyn Baring in the 1950s, after initially being conceived by the South African civil engineer Ninham Shand while carrying out investigations commissioned by the British Government into the rivers of Lesotho. As initially conceived, the project was known as the Oxbow Scheme . After a feasibility study was conducted between August 1983 and August 1986 by

639-467: A deep valley, it will have the same nominal pressure, however each consumer will get a bit more or less because of the hydrostatic pressure (about 1 bar/10 m height). So people at the bottom of a 30-metre (100 ft) hill will get about 3 bars more than those at the top. The effective pressure also varies because of the pressure loss due to supply resistance, even for the same static pressure. An urban consumer may have 5 metres of 15-mm pipe running from

710-701: A few cases such multi-utilities also collect solid waste and provide local telephone services. An example of such an integrated utility can be found in the Colombian city of Medellín . Utilities that provide water, sanitation and electricity can be found in Frankfurt , Germany (Mainova), in Casablanca , Morocco and in Gabon in West Africa. Multi-utilities provide certain benefits such as common billing and

781-514: A great degree of autonomy. In the United States regulatory agencies for utilities have existed for almost a century at the level of states, and in Canada at the level of provinces. In both countries they cover several infrastructure sectors. In many U.S. states they are called Public Utility Commissions . For England and Wales, a regulatory agency for water ( OFWAT ) was created as part of

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852-429: A huge amount of capital investment in infrastructure such as pipe networks, pumping stations and water treatment works . It is estimated that in developing countries investments of at least US$ 200 billion have to be made per year to replace aging water infrastructure to guarantee supply, reduce leakage rates and protect water quality. International attention has focused upon the needs of developing countries . To meet

923-424: A long time to fill a bath but suit the high back pressure of a shower. A great variety of institutions have responsibilities in water supply. A basic distinction is between institutions responsible for policy and regulation on the one hand; and institutions in charge of providing services on the other hand. Water supply policies and regulation are usually defined by one or several Ministries, in consultation with

994-410: A mandate to settle complaints by consumers that have not been dealt with satisfactorily by service providers. These specialized entities are expected to be more competent and objective in regulating service providers than departments of government Ministries. Regulatory agencies are supposed to be autonomous from the executive branch of government, but in many countries have often not been able to exercise

1065-534: A modification, proposing instead a dam on the Senqu, upstream from its confluence with the Malibamatso. This is currently the preferred extension of the scheme, although construction has not yet begun (as of November 2021). Water supply The cost of supplying water consists, to a very large extent, of fixed costs (capital costs and personnel costs) and only to a small extent of variable costs that depend on

1136-496: A poor or very poor quality of service. Continuity of water supply is taken for granted in most developed countries but is a severe problem in many developing countries, where sometimes water is only provided for a few hours every day or a few days a week; that is, it is intermittent . This is especially problematic for informal settlements , which are often poorly connected to the water supply network and have no means of procuring alternative sources such as private boreholes . It

1207-466: A single city, town or municipality . However, in many countries municipalities have associated in regional or inter-municipal or multi-jurisdictional utilities to benefit from economies of scale . In the United States these can take the form of special-purpose districts which may have independent taxing authority. An example of a multi-jurisdictional water utility in the United States is WASA ,

1278-557: A sustained improvement track, but many others keep falling further behind best practice. Benchmarking the performance of utilities allows the stimulation of competition, establish realistic targets for improvement and create pressure to catch up with better utilities. Information on benchmarks for water and sanitation utilities is provided by the International Benchmarking Network for Water and Sanitation Utilities. The cost of supplying water consists, to

1349-576: A trickle of water or so high that it leads to damage to plumbing fixtures and waste of water. Pressure in an urban water system is typically maintained either by a pressurised water tank serving an urban area, by pumping the water up into a water tower and relying on gravity to maintain a constant pressure in the system or solely by pumps at the water treatment plant and repeater pumping stations. Typical UK pressures are 4–5 bar (60–70 PSI ) for an urban supply. However, some people can get over eight bars or below one bar. A single iron main pipe may cross

1420-485: A typical consumption of 15 cubic meters per month vary between less than US$ 1 and US$ 12 per month. Water and sanitation tariffs, which are almost always billed together, can take many different forms. Where meters are installed, tariffs are typically volumetric (per usage), sometimes combined with a small monthly fixed charge. In the absence of meters, flat or fixed rates—which are independent of actual consumption—are being charged. In developed countries, tariffs are usually

1491-759: A utility serving Washington, D.C. and various localities in the state of Maryland . Multi-jurisdictional utilities are also common in Germany, where they are known as "Zweckverbaende", in France and in Italy. In some federal countries, there are water service providers covering most or all cities and towns in an entire state, such as in all states of Brazil and some states in Mexico (see Water supply and sanitation in Mexico ). In England and Wales , water supply and sewerage

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1562-516: A utility to better locate distribution losses (technical objective). Fourth, it allows suppliers to charge for water based on use, which is perceived by many as the fairest way to allocate the costs of water supply to users. Metering is considered good practice in water supply and is widespread in developed countries, except for the United Kingdom . In developing countries it is estimated that half of all urban water supply systems are metered and

1633-418: A very large extent, of fixed costs (capital costs and personnel costs) and only to a small extent of variable costs that depend on the amount of water consumed (mainly energy and chemicals). The full cost of supplying water in urban areas in developed countries is about US$ 1–2 per cubic meter depending on local costs and local water consumption levels. The cost of sanitation (sewerage and wastewater treatment )

1704-434: A viable solution including Rainwater harvesting and Stormwater harvesting where policies are eventually tending towards a more rational use and sourcing of water incorporation concepts such as "Fit for Purpose". Water supply service quality has many dimensions: continuity; water quality ; pressure; and the degree of responsiveness of service providers to customer complaints. Many people in developing countries receive

1775-662: Is Africa's largest water transfer scheme. The purpose of the project is to provide Lesotho with a source of revenue in exchange for the provision of water to South Africa, as well as generate hydroelectricity for Lesotho. As of 2015, royalties paid by South Africa to the Lesotho government amount to R780 million, equivalent to about 5 percent of Lesotho's state income outside of taxes. The hydro-electric power has enabled Lesotho to become self-sufficient in electricity production, however criticisms have included loss of livelihoods for displaced people and ecological impacts. Efforts to create

1846-438: Is a consortium comprising Salini Impregilo and Cooperativa Muratori Cementistri (CMC di Ravenna), both from Italy, CMI Infrastructure Company of South Africa and LSP Construction of Lesotho. Completion of phase 2 is expected in 2028. As initially conceived, three further dams were proposed further downstream after the Malibamatso joins the Senqu river, at Mashai, Tsoelike, and Ntoahae. In 2007, further studies resulted in

1917-622: Is also a risk that staff are appointed mainly on political grounds rather than based on their professional credentials. International standards for water supply system are covered by International Classification of Standards (ICS) 91.140.60. Comparing the performance of water and sanitation service providers ( utilities ) is needed, because the sector offers limited scope for direct competition ( natural monopoly ). Firms operating in competitive markets are under constant pressure to out perform each other. Water utilities are often sheltered from this pressure, and it frequently shows: some utilities are on

1988-559: Is an essential governance reform in order to reduce the high levels of Unaccounted-for Water (UAW) and to provide the finance needed to extend the network to those poorest households who remain unconnected. Partnership arrangements between the public and private sector can play an important role in order to achieve this objective. An estimated 10 percent of urban water supply is provided by private or mixed public-private companies, usually under concessions , leases or management contracts . Under these water service contract arrangements

2059-454: Is another US$ 1–2 per cubic meter. These costs are somewhat lower in developing countries. Throughout the world, only part of these costs is usually billed to consumers, the remainder being financed through direct or indirect subsidies from local, regional or national governments (see section on tariffs). Besides subsidies water supply investments are financed through internally generated revenues as well as through debt. Debt financing can take

2130-455: Is estimated that about half of the population of developing countries receives water on an intermittent basis. Drinking water quality has a micro-biological and a physico-chemical dimension. There are thousands of parameters of water quality. In public water supply systems water should, at a minimum, be disinfected—most commonly through the use of chlorination or the use of ultraviolet light—or it may need to undergo treatment, especially in

2201-448: Is insulated from arbitrary political intervention; and whether there is an explicit mandate and political will to allow the service provider to recover all or at least most of its costs through tariffs and retain these revenues. If water supply is the responsibility of a department that is integrated in the administration of a city, town or municipality, there is a risk that tariff revenues are diverted for other purposes. In some cases, there

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2272-582: Is supplied almost entirely through ten regional companies. Some smaller countries, especially developed countries, have established service providers that cover the entire country or at least most of its cities and major towns. Such national service providers are especially prevalent in West Africa and Central America, but also exist, for example, in Tunisia , Jordan and Uruguay (see also water supply and sanitation in Uruguay ). In rural areas, where about half

2343-412: Is used, wastewater is typically discharged in a sewer system and treated in a sewage treatment plant before being discharged into a river, lake, or the sea or reused for landscaping or irrigation . 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: In

2414-748: The Millennium Development Goals targets of halving the proportion of the population lacking access to safe drinking water and basic sanitation by 2015, current annual investment on the order of US$ 10 to US$ 15 billion would need to be roughly doubled. This does not include investments required for the maintenance of existing infrastructure. Once infrastructure is in place, operating water supply and sanitation systems entails significant ongoing costs to cover personnel, energy, chemicals, maintenance and other expenses. The sources of money to meet these capital and operational costs are essentially either user fees, public funds or some combination of

2485-417: The United States , the typical single family home uses about 520 L (138 US gal) of water per day (2016 estimate) or 222 L (58.6 US gal) per capita per day. This includes several common residential end use purposes (in decreasing order) like toilet use, showers , tap (faucet) use, washing machine use, leaks , other (unidentified), baths , and dishwasher use. During

2556-527: The 1st millennium BC used qanat system to gain access to water in the mountains. Early Rome had indoor plumbing, meaning a system of aqueducts and pipes that terminated in homes and at public wells and fountains for people to use. Until the Enlightenment era , little progress was made in water supply and sanitation and the engineering skills of the Romans were largely neglected throughout Europe. It

2627-709: The German-British Lahmeyer MacDonald Consortium, the project eventually began to be realized. The project has been alleged to have had negative social and environmental effects. While compensation was provided in kind and paid to the few hundred households affected by the dams, there is criticism that it was insufficient. In recent years, water from the scheme has been discharged into the Mohokare (Caledon) river to provide water to Maseru in times of critical shortages. The new dams have filled as anticipated and discharge of water from

2698-749: The Muela Reservoir is a 37-kilometre (23 mi) delivery tunnel to the outfall at the As River from where water flows to the Vaal Dam . Although the Katse Dam has power generation capability for local use, the primary purpose is as the storage reservoir for Phase IA, and to provide discharge into the transfer tunnel. To mitigate loss of habitat, the Katse Botanical Gardens was established to house plants that were rescued from

2769-744: The R40 billion required to complete phase 2. In August 2023, the Trans-Caledon Tunnel Authority (TCTA) secured funding from the New Development Bank amounting to 3.2 billion South African rand (approx. US$ 172 million) to be applied to the continuation of Phase 2. This loan is in addition to US$ 86.72 million borrowed from the African Development Bank as well as funding from other sources. The engineering, procurement and construction (EPC) contractor

2840-735: The United States and the equivalent of US$ 2.25 per cubic meter in Denmark. However, water consumption is much higher in the US than in Europe. Therefore, residential water bills may be very similar, even if the tariff per unit of consumption tends to be higher in Europe than in the US. A typical family on the US East Coast paid between US$ 30 and US$ 70 per month for water and sewer services in 2005. In developing countries, tariffs are usually much further from covering costs. Residential water bills for

2911-527: The World Bank the average ( mean ) global water tariff is US$ 0.53 per cubic meter. In developed countries the average tariff is US$ 1.04, while it is only U$ 0.11 in the poorest developing countries. The lowest tariffs in developing countries are found in South Asia (mean of US$ 0.09/m3), while the highest are found in Latin America (US$ 0.41/m3). Data for 132 cities were assessed. The tariff is estimate for

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2982-493: The amount of water consumed (mainly energy and chemicals). Almost all service providers in the world charge tariffs to recover part of their costs. Water supply is a separate topic from irrigation , the practice and systems of water supply on a larger scale, for a wider variety of purposes, primarily agriculture . Water supply systems get water from a variety of locations after appropriate treatment, including groundwater ( aquifers ), surface water ( lakes and rivers ), and

3053-740: The area to be flooded. This phase of the project was completed in 2002. It consisted mainly of the construction of: The system is interconnected in such a way that water may be transferred in either direction for storage in Mohale or ultimate transfer to South Africa through the Katse reservoir. The CEO of the LHWP implementing body of the Lesotho Highlands Development Authority (LHDA), Refiloe Tlali, said: "the 2.3-billion cubic metre Polihali dam will be built downstream of

3124-475: The beginning of the 21st Century, especially in areas of urban and suburban population centers, traditional centralized infrastructure have not been able to supply sufficient quantities of water to keep up with growing demand. Among several options that have been managed are the extensive use of desalination technology, this is especially prevalent in coastal areas and in "dry" countries like Australia . Decentralization of water infrastructure has grown extensively as

3195-441: The best forms of public management. As Ryutaro Hashimoto , former Japanese Prime Minister, notes: "Public water services currently provide more than 90 percent of water supply in the world. Modest improvement in public water operators will have immense impact on global provision of services." Governance arrangements for both public and private utilities can take many forms (Kurian and McCarney, 2010). Governance arrangements define

3266-427: The case of surface water . Water quality is also dependent of the quality and level of pollution of the water source. Water pressures vary in different locations of a distribution system. Water mains below the street may operate at higher pressures, with a pressure reducer located at each point where the water enters a building or a house. In poorly managed systems, water pressure can be so low as to result only in

3337-624: The confluence of the Senqu and Khubelu rivers. The dam will have a 163.5 m high concrete-faced rockfill embankment dam wall. The crest length will be 915 m, with a full supply level of 2,075 m above sea level. A 49.5 m high saddle dam and spillway will also be built." Upon completion phase 2 will enable over 400 million cubic metres of water to flow from Lesotho to the Vaal Dam and will move the total volume of water being transferred from Lesotho to South Africa to over 1.27 billion cubic metres per year. The Trans Caledon Tunnel Authority will raise most of

3408-411: The dams into the downstream rivers continues in a scheme devised to preserve ecological balances. This discharged water flows to the Senqu (Orange) and while preserving the ecological status quo benefits only those communities along the rivers. The project has had an important impact on Lesotho's infrastructure, as hundreds of kilometers of engineered paved roads were built in order to improve access to

3479-420: The different construction sites, together with engineered unpaved 'feeder' roads around the dams. Since its inception, the project has been dogged by corruption which has resulted in a number of court cases involving both individuals and multinational corporations. Below is an overview of the main features of the first three phases of the project. (installed capacity) Phase of the project comprises all

3550-462: The essential components to impound water in the Katse Dam , generate electricity and deliver water to the Vaal River System . Phase I has been carefully configured so that Katse Dam remains the common link to further phases identified during feasibility studies. In line with the phased approach, Phase I consists of Phase IA comprising the essential components, and Phase IB which enhances the yield of

3621-457: The form of credits from commercial Banks, credits from international financial institutions such as the World Bank and regional development banks (in the case of developing countries), and bonds (in the case of some developed countries and some upper middle-income countries). Almost all service providers in the world charge tariffs to recover part of their costs. According to estimates by

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3692-497: The iron main, so the kitchen tap flow will be fairly unrestricted. A rural consumer may have a kilometre of rusted and limed 22-mm iron pipe, so their kitchen tap flow will be small. For this reason, the UK domestic water system has traditionally (prior to 1989) employed a "cistern feed" system, where the incoming supply is connected to the kitchen sink and also a header/storage tank in the attic . Water can dribble into this tank through

3763-669: The legislative branch. In the United States the United States Environmental Protection Agency , whose administrator reports directly to the President, is responsible for water and sanitation policy and standard setting within the executive branch. In other countries responsibility for sector policy is entrusted to a Ministry of Environment (such as in Mexico and Colombia ), to a Ministry of Health (such as in Panama , Honduras and Uruguay ),

3834-584: The main losers from this institutional arrangement are the urban poor in these countries. Because they are not connected to the water supply network , they end up paying far more per liter of water than do more well-off households connected to the network who benefit from the implicit subsidies that they receive from loss-making utilities. The fact that we are still so far from achieving universal access to clean water and sanitation shows that public water authorities, in their current state, are not working well enough. Yet some are being very successful and are modelling

3905-463: The national government. This is, for example, the case in the countries of continental Europe, in China and India. Water supply service providers, which are often utilities , differ from each other in terms of their geographical coverage relative to administrative boundaries; their sectoral coverage; their ownership structure; and their governance arrangements. Many water utilities provide services in

3976-545: The option to cross-subsidize water services with revenues from electricity sales, if permitted by law. Water supply providers can be either public, private, mixed or cooperative. Most urban water supply services around the world are provided by public entities. As Willem-Alexander, Prince of Orange (2002) stated, "The water crisis that is affecting so many people is mainly a crisis of governance—not of water scarcity ." The introduction of cost-reflective tariffs together with cross-subsidization between richer and poorer consumers

4047-428: The overall low level of water tariffs in developing countries even at higher levels of consumption, most consumption subsidies benefit the wealthier segments of society. Also, high industrial and commercial tariffs can provide an incentive for these users to supply water from other sources than the utility (own wells, water tankers) and thus actually erode the utility's revenue base. Water supply and sanitation require

4118-541: The privatization of the water industry in 1989. In many developing countries, water regulatory agencies were created during the 1990s in parallel with efforts at increasing private sector participation. (for more details on regulatory agencies in Latin America, for example, please see Water and sanitation in Latin America and the regional association of water regulatory agencies ADERASA. ) Many countries do not have regulatory agencies for water. In these countries service providers are regulated directly by local government, or

4189-639: The project with the addition of two peripheral sources namely the Mohale Dam and the Matsoku Weir . This phase of the project was completed in 1998. It consisted mainly of the construction of the Katse Dam on the Malibamat'so River in Lesotho. A 45-kilometre (28 mi) transfer tunnel was built from the Katse Dam to the Muela Reservoir. The Muela Reservoir is considered to be the tail pond, which supplies hydroelectric power for Lesotho. Stemming from

4260-731: The public entity that is legally responsible for service provision delegates certain or all aspects of service provision to the private service provider for a period typically ranging from 4 to 30 years. The public entity continues to own the assets. These arrangements are common in France and in Spain . Only in few parts of the world water supply systems have been completely sold to the private sector ( privatization ), such as in England and Wales as well as in Chile . The largest private water companies in

4331-451: The public sector. They are owned by the state or local authorities, or also by collectives or cooperatives. They run without an aim for profit but are based on the ethos of providing a common good considered to be of public interest. In most middle and low-income countries, these publicly owned and managed water providers can be inefficient as a result of political interference, leading to over-staffing and low labor productivity. Ironically,

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4402-412: The relationship between the service provider, its owners, its customers and regulatory entities. They determine the financial autonomy of the service provider and thus its ability to maintain its assets, expand services, attract and retain qualified staff, and ultimately to provide high-quality services. Key aspects of governance arrangements are the extent to which the entity in charge of providing services

4473-594: The same for different categories of users and for different levels of consumption. In developing countries, the situation is often characterized by cross-subsidies with the intent to make water more affordable for residential low-volume users that are assumed to be poor. For example, industrial and commercial users are often charged higher tariffs than public or residential users. Also, metered users are often charged higher tariffs for higher levels of consumption (increasing-block tariffs). However, cross-subsidies between residential users do not always reach their objective. Given

4544-412: The sea through desalination . The water treatment steps include, in most cases, purification , disinfection through chlorination and sometimes fluoridation . Treated water then either flows by gravity or is pumped to reservoirs , which can be elevated such as water towers or on the ground (for indicators related to the efficiency of drinking water distribution see non-revenue water ). Once water

4615-565: The setting of tariff rules and the approval of tariff increases; setting, monitoring and enforcing norms for quality of service and environmental protection; benchmarking the performance of service providers; and reforms in the structure of institutions responsible for service provision. The distinction between policy functions and regulatory functions is not always clear-cut. In some countries they are both entrusted to Ministries, but in others regulatory functions are entrusted to agencies that are separate from Ministries. Dozens of countries around

4686-493: The tendency is increasing. Water meters are read by one of several methods: Most cities are increasingly installing automatic meter reading (AMR) systems to prevent fraud, to lower ever-increasing labor and liability costs and to improve customer service and satisfaction. According to the World Health Organization (WHO), "access to safe drinking-water is essential to health, a basic human right and

4757-410: The two. It is also important to consider is the flexibility of the water supply system. Metering of water supply is usually motivated by one or several of four objectives. First, it provides an incentive to conserve water which protects water resources (environmental objective). Second, it can postpone costly system expansion and saves energy and chemical costs (economic objective). Third, it allows

4828-400: The world are Suez and Veolia Environnement from France; Aguas de Barcelona from Spain; and Thames Water from the UK, all of which are engaged internationally (see links to website of these companies below). In recent years, a number of cities have reverted to the public sector in a process called " remunicipalization ". 90% of urban water supply and sanitation services are currently in

4899-423: The world have established regulatory agencies for infrastructure services, including often water supply and sanitation, in order to better protect consumers and to improve efficiency. Regulatory agencies can be entrusted with a variety of responsibilities, including in particular the approval of tariff increases and the management of sector information systems, including benchmarking systems. Sometimes they also have

4970-504: The world population lives, water services are often not provided by utilities, but by community-based organizations which usually cover one or sometimes several villages. Some water utilities provide only water supply services, while sewerage is under the responsibility of a different entity. This is for example the case in Tunisia . However, in most cases water utilities also provide sewer and sewage treatment services. In some cities or countries utilities also distribute electricity. In

5041-485: Was in the 18th century that a rapidly growing population fueled a boom in the establishment of private water supply networks in London . London water supply infrastructure developed over many centuries from early mediaeval conduits, through major 19th-century treatment works built in response to cholera threats, to modern, large-scale reservoirs. The first screw-down water tap was patented in 1845 by Guest and Chrimes,

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