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Awater supply network orwater supply system is a system of engineeredhydrologic andhydraulic components that providewater supply. A water supply system typically includes the following:
Water supply networks are often run bypublic utilities of thewater industry.
Raw water (untreated) is from asurface water source (such as an intake on alake or ariver) or from agroundwater source (such as awater well drawing from an undergroundaquifer) within thewatershed that provides thewater resource.
The raw water is transferred to the water purification facilities using uncovered aqueducts, covered tunnels or undergroundwater pipes.
Virtually all large systems must treat the water; a fact that is tightly regulated by global, state and federal agencies, such as theWorld Health Organization (WHO) or theUnited States Environmental Protection Agency (EPA). Water treatment must occur before the product reaches the consumer and afterwards (when it is discharged again). Water purification usually occurs close to the final delivery points to reduce pumping costs and the chances of the water becoming contaminated after treatment.
Traditional surface water treatment plants generally consists of three steps: clarification, filtration and disinfection. Clarification refers to the separation of particles (dirt, organic matter, etc.) from the water stream. Chemical addition (i.e. alum, ferric chloride) destabilizes the particle charges and prepares them for clarification either by settling or floating out of the water stream. Sand, anthracite or activated carbon filters refine the water stream, removing smaller particulate matter. While other methods of disinfection exist, the preferred method is via chlorine addition. Chlorine effectively kills bacteria and most viruses and maintains a residual to protect the water supply through the supply network.
The product, delivered to the point of consumption, is calledpotable water if it meets thewater quality standards required for human consumption.
The water in the supply network is maintained at positive pressure to ensure that water reaches all parts of the network, that a sufficient flow is available at every take-off point and to ensure that untreated water in the ground cannot enter the network. The water is typically pressurised by pumping the water into storage tanks constructed at the highest local point in the network. One network may have several suchservice reservoirs.
In small domestic systems, the water may be pressurised by apressure vessel or even by anunderground cistern (the latter however does need additional pressurizing). This eliminates the need of awater tower or any other heightened water reserve to supply the water pressure.
These systems are usually owned and maintained by local governments such as cities or other public entities, but are occasionally operated by a commercial enterprise (seewater privatization). Water supply networks are part of the master planning of communities, counties, and municipalities. Their planning and design requires the expertise ofcity planners andcivil engineers, who must consider many factors, such as location, current demand, future growth, leakage, pressure, pipe size, pressure loss, fire fighting flows, etc.—usingpipe network analysis and other tools.
As water passes through the distribution system, the water quality can degrade by chemical reactions and biological processes. Corrosion of metal pipe materials in the distribution system can cause the release of metals into the water with undesirable aesthetic and health effects. Release ofiron from unlined iron pipes can result in customer reports of "red water" at the tap. Release ofcopper fromcopper pipes can result in customer reports of "blue water" and/or a metallic taste. Release oflead can occur from thesolder used to join copper pipe together or frombrassfixtures. Copper and lead levels at the consumer's tap are regulated to protect consumer health.
Utilities will often adjust the chemistry of the water before distribution to minimize its corrosiveness. The simplest adjustment involves control ofpH andalkalinity to produce a water that tends to passivate corrosion by depositing a layer ofcalcium carbonate.Corrosion inhibitors are often added to reduce release of metals into the water. Common corrosion inhibitors added to the water arephosphates andsilicates.
Maintenance of a biologically safe drinking water is another goal in water distribution. Typically, a chlorine baseddisinfectant, such assodium hypochlorite ormonochloramine is added to the water as it leaves the treatment plant. Booster stations can be placed within the distribution system to ensure that all areas of the distribution system have adequate sustained levels ofdisinfection.
Like electric power lines, roads, and microwave radio networks, water systems may have aloop orbranch network topology, or a combination of both. The piping networks are circular or rectangular. If any one section of water distribution main fails or needs repair, that section can be isolated without disrupting all users on the network.
Most systems are divided into zones.[1] Factors determining the extent or size of a zone can include hydraulics,telemetry systems, history, and population density. Sometimes systems are designed for a specific area then are modified to accommodate development. Terrain affects hydraulics and some forms of telemetry. While each zone may operate as a stand-alone system, there is usually some arrangement to interconnect zones in order to manage equipment failures or system failures.
Water supply networks usually represent the majority of assets of a water utility. Systematic documentation of maintenance works using acomputerized maintenance management system (CMMS) is a key to a successful operation of a water utility.[why?]
A sustainable urban water supply network covers all the activities related to provision ofpotable water.Sustainable development is of increasing importance for the water supply to urban areas. Incorporating innovative water technologies intowater supply systems improves water supply from sustainable perspectives. The development of innovative water technologies provides flexibility to the water supply system, generating a fundamental and effective means of sustainability based on an integratedreal options approach.[2]
Water is an essentialnatural resource for human existence. It is needed in every industrial and natural process, for example, it is used foroil refining, forliquid-liquid extraction in hydro-metallurgical processes, for cooling, for scrubbing in the iron and the steel industry, and for several operations infood processing facilities.
It is necessary to adopt a new approach to design urban water supply networks;water shortages are expected in the forthcoming decades and environmental regulations for water utilization andwaste-water disposal are increasingly stringent.
To achieve a sustainable water supply network, new sources of water are needed to be developed, and to reduce environmental pollution.
The price of water is increasing, so less water must be wasted and actions must be taken to prevent pipeline leakage. Shutting down the supply service to fix leaks is less and less tolerated by consumers. A sustainable water supply network must monitor the freshwater consumption rate and the waste-water generation rate.
Many of the urban water supply networks indeveloping countries face problems related topopulation increase,water scarcity, andenvironmental pollution.
In 1900 just 13% of the global population lived in cities. By 2005, 49% of theglobal population lived in urban areas. In 2030 it is predicted that this statistic will rise to 60%.[3] Attempts to expand water supply by governments are costly and often not sufficient. The building of new illegal settlements makes it hard to map, and make connections to, the water supply, and leads to inadequate water management.[4] In 2002, there were 158 million people with inadequatewater supply.[5] An increasing number of people live inslums, in inadequate sanitary conditions, and are therefore at risk ofdisease.
Potable water is not well distributed in the world. 1.8 million deaths are attributed to unsafe water supplies every year, according to theWHO.[6] Many people do not have any access, or do not have access to quality and quantity of potable water, though water itself is abundant. Poor people in developing countries can be close to major rivers, or be in high rainfall areas, yet not have access to potable water at all. There are also people living where lack of water creates millions of deaths every year.
Where the water supply system cannot reach the slums, people manage to usehand pumps, to reach the pit wells,rivers,canals,swamps and any other source of water. In most cases the water quality is unfit for human consumption. The principal cause of water scarcity is the growth in demand. Water is taken from remote areas to satisfy the needs of urban areas. Another reason for water scarcity isclimate change:precipitation patterns have changed; rivers have decreased their flow;lakes are drying up; andaquifers are being emptied.
In developing countries many governments arecorrupt and poor and they respond to these problems with frequently changing policies and non clear agreements.[7] Water demand exceeds supply, and household and industrial water supplies are prioritised over other uses, which leads towater stress.[8] Potable water has a price in the market; water often becomes abusiness for private companies, which earn aprofit by putting a higher price on water, which imposes a barrier for lower-income people. TheMillennium Development Goals propose the changes required.
Goal 6 of the United Nations'Sustainable Development Goals is to "Ensure availability and sustainable management of water and sanitation for all".[9] This is in recognition of the human right to water and sanitation, which was formally acknowledged at the United Nations General Assembly in 2010, that "clean drinking water and sanitation are essential to the recognition of all human rights".[10] Sustainable water supply includes ensuring availability, accessibility, affordability and quality of water for all individuals.
In advanced economies, the problems are about optimising existing supply networks. These economies have usually had continuing evolution, which allowed them to construct infrastructure to supply water to people. TheEuropean Union has developed a set of rules and policies to overcome expected future problems.
There are many international documents with interesting, but not very specific, ideas and therefore they are not put into practice.[11] Recommendations have been made by theUnited Nations, such as theDublin Statement on Water and Sustainable Development.
The yield of a system can be measured by either its value or its net benefit. For a water supply system, the true value or the net benefit is a reliable water supply service having adequate quantity and good quality of the product. For example, if the existing water supply of a city needs to be extended to supply a newmunicipality, the impact of the new branch of the system must be designed to supply the new needs, while maintaining supply to the old system.
The design of a system is governed by multiple criteria, one being cost. If the benefit isfixed, theleast cost design results in maximum benefit. However, the least cost approach normally results in aminimum capacity for a water supply network. A minimum cost model usually searches for the least cost solution (in pipe sizes), while satisfying the hydraulic constraints such as: required output pressures, maximumpipe flow rate and pipe flow velocities. The cost is a function of pipe diameters; therefore theoptimization problem consists of finding a minimum cost solution by optimising pipe sizes to provide the minimum acceptable capacity.
However, according to the authors of the paper entitled, “Method for optimizing design and rehabilitation of water distribution systems”, “the least capacity is not a desirable solution to a sustainable water supply network in a long term, due to the uncertainty of the future demand”.[12] It is preferable to provide extra pipe capacity to cope with unexpected demand growth and with water outages. The problem changes from a single objective optimization problem (minimizing cost), to a multi-objective optimization problem (minimizing cost and maximizing flow capacity).
To solve a multi-objective optimization problem, it is necessary to convert the problem into a single objective optimization problem, by using adjustments, such as a weighted sum ofobjectives, or an ε-constraint method. The weighted sum approach gives a certain weight to the different objectives, and then factors in all these weights to form a single objective function that can be solved by single factor optimization. This method is not entirely satisfactory, because the weights cannot be correctly chosen, so this approach cannot find the optimal solution for all the original objectives.
The second approach (the constraint method), chooses one of the objective functions as the single objective, and the other objective functions are treated as constraints with a limited value. However, the optimal solution depends on the pre-defined constraint limits.
The multiple objective optimization problems involve computing thetradeoff between the costs and benefits resulting in a set of solutions that can be used for sensitivity analysis and tested in different scenarios. But there is no single optimal solution that will satisfy the global optimality of both objectives. As both objectives are to some extent contradictory, it is not possible to improve one objective without sacrificing the other. It is necessary in some cases use a different approach. (e.g.Pareto Analysis), and choose the best combination.
Returning to the cost objective function, it cannot violate any of the operational constraints. Generally this cost is dominated by the energy cost for pumping. “The operational constraints include the standards ofcustomer service, such as: the minimum delivered pressure, in addition to the physical constraints such as the maximum and the minimum water levels in storage tanks to prevent overtopping and emptying respectively.”[13]
In order to optimize the operational performance of the water supply network, at the same time as minimizing the energy costs, it is necessary to predict the consequences of different pump and valve settings on the behavior of the network.
Apart from Linear and Non-linear Programming, there are other methods and approaches to design, to manage and operate a water supply network to achieve sustainability—for instance, the adoption ofappropriate technology coupled with effective strategies for operation and maintenance. These strategies must include effective management models, technical support to the householders and industries, sustainable financing mechanisms, and development of reliablesupply chains. All these measures must ensure the following: system working lifespan; maintenance cycle; continuity of functioning; down time for repairs; water yield and water quality.
In an unsustainable system there is insufficient maintenance of the water networks, especially in the major pipe lines in urban areas. The system deteriorates and then needs rehabilitation or renewal.
Householders andsewage treatment plants can both make the water supply networks more efficient and sustainable. Major improvements ineco-efficiency are gained through systematic separation of rainfall and wastewater. Membrane technology can be used for recycling wastewater.
The municipal government can develop a “Municipal Water Reuse System” which is a current approach to manage the rainwater. It applies awater reuse scheme for treated wastewater, on a municipal scale, to provide non-potable water for industry, household and municipal uses. This technology consists in separating theurine fraction of sanitary wastewater, and collecting it for recycling itsnutrients.[14] Thefeces andgraywater fraction is collected, together with organic wastes from the households, using agravitysewer system, continuously flushed with non-potable water. The water is treatedanaerobically and thebiogas is used forenergy production.
One effective way to achieve sustainable water management is to shift emphasis towards decentralized water projects, such as drip irrigation diffusion in India.[15] This project covers large spatial areas while relying on individual technological adoption decisions, offering scalable solutions that can mitigate water scarcity and enhance agricultural productivity.
Another method that can be utilized is through the promoting of community engagement and resistance against unsustainable water infrastructure projects. Grassroots movements, as observed in anti-dam protests in various countries, play a crucial role in challenging dominant development narratives and advocating for more socially and ecologically just water management practices.[15]
Municipalities and other forms of local governments should also invest in innovative technologies, such as membrane technology for wastewater recycling, and develop policy frameworks that incentivize eco-efficient practices. Municipal water reuse systems, as demonstrated in implementation, offer promising avenues for integrating wastewater treatment and resource recovery into urban water networks.[15]
The sustainable water supply system is an integrated system including water intake, water utilization, wastewater discharge and treatment and waterenvironmental protection. It requires reducingfreshwater andgroundwater usage in all sectors of consumption. Developing sustainable water supply systems is a growing trend, because it serves people's long-term interests.[16] There are several ways to reuse and recycle the water, in order to achieve long-term sustainability, such as:
Other possible approaches to scoping models for water supply, applicable to any urban area, include the following:
TheDublin Statement on Water and Sustainable Development is a good example of the new trend to overcome water supply problems. This statement, suggested by advanced economies, has come up with some principles that are of great significance to urban water supply. These are:
From these statements, developed in 1992, several policies have been created to give importance to water and to move urbanwater system management towards sustainable development. TheWater Framework Directive by theEuropean Commission is a good example of what has been created there out of former policies.
There is great need for a more sustainable water supply systems. To achieve sustainability several factors must be tackled at the same time: climate change, rising energy cost, and rising populations. All of these factors provoke change and put pressure on management of available water resources.[18]
An obstacle to transforming conventional water supply systems is the amount of time needed to achieve the transformation. More specifically, transformation must be implemented by municipallegislation bodies, which always need short-term solutions too.[citation needed] Another obstacle to achieving sustainability in water supply systems is the insufficient practical experience with the technologies required, and the missing know-how about the organization and the transition process.
Urban water infrastructure faces several challenges that undermine its sustainability and resilience. One critical issue highlighted in recent research is the vulnerability of water networks to climate variability and extreme weather events. Poor seasonal rains, as observed in the case of the Panama Canal's lock and dam infrastructure, exemplify how inadequate water supply can strain water-intensive infrastructure, raising questions about engineering legitimacy and the reliability of water systems.[19]
Another key challenge is the unequal development associated with large-scale water infrastructure projects such as dams and canals. Such projects, while aimed at promoting economic growth, often actually reproduce social and economic inequalities by displacing rural communities and marginalizing indigenous populations.[19] This phenomenon of "accumulation by dispossession" further emphasizes the need for more equitable and inclusive approaches to water infrastructure development.[19]
Possible ways to improve this situation is simulating of the network, implementingpilot projects, learning from the costs involved and the benefits achieved.
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