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Infrastructure is the set of facilities and systems that serve a country, city, or other area, and encompasses the services and facilities necessary for its economy, households and firms to function. Infrastructure is composed of public and private physical structures such as roads, railways, bridges, tunnels,
water supply Water supply is the provision of water by public utilities, commercial organisations, community endeavors or by individuals, usually via a system of pumps and pipes. Public water supply systems are crucial to properly functioning societies. Th ...
, sewers, electrical grids, and telecommunications (including Internet connectivity and
broadband access Internet access is the ability of individuals and organizations to connect to the Internet using computer terminals, computers, and other devices; and to access services such as email and the World Wide Web. Internet access is sold by Interne ...
). In general, infrastructure has been defined as "the physical components of interrelated systems providing commodities and services essential to enable, sustain, or enhance societal
living conditions Habitability refers to the adequacy of an environment for human living. Where housing is concerned, there are generally local ordinances which define habitability. If a residence complies with those laws it is said to be habitable. In extreme e ...
" and maintain the surrounding environment. Especially in light of the massive societal transformations needed to mitigate and adapt to climate change, contemporary infrastructure conversations frequently focus on
sustainable development Sustainable development is an organizing principle for meeting human development goals while also sustaining the ability of natural systems to provide the natural resources and ecosystem services on which the economy and society depend. The ...
and green infrastructure. Acknowledging this importance, the international community has created policy focused on sustainable infrastructure through the
Sustainable Development Goals The Sustainable Development Goals (SDGs) or Global Goals are a collection of 17 interlinked objectives designed to serve as a "shared blueprint for peace and prosperity for people and the planet, now and into the future".United Nations (2017) R ...
, especially Sustainable Development Goal 9 " Industry, Innovation and Infrastructure". One way to describe different types of infrastructure is to classify them as two distinct kinds: hard infrastructure and soft infrastructure. Hard infrastructure is the physical networks necessary for the functioning of a modern industry. This includes roads, bridges, and railways. Soft infrastructure is all the institutions that maintain the
economic An economy is an area of the production, distribution and trade, as well as consumption of goods and services. In general, it is defined as a social domain that emphasize the practices, discourses, and material expressions associated with th ...
,
health Health, according to the World Health Organization, is "a state of complete physical, mental and social well-being and not merely the absence of disease and infirmity".World Health Organization. (2006)''Constitution of the World Health Organ ...
,
social Social organisms, including human(s), live collectively in interacting populations. This interaction is considered social whether they are aware of it or not, and whether the exchange is voluntary or not. Etymology The word "social" derives from ...
,
environmental A biophysical environment is a biotic and abiotic surrounding of an organism or population, and consequently includes the factors that have an influence in their survival, development, and evolution. A biophysical environment can vary in scal ...
, and cultural standards of a country. This includes
educational program An educational program is a program written by the institution or ministry of education which determines the learning progress of each subject in all the stages of formal education. See also * Philosophy of education *Curriculum In education ...
s,
official statistics Official statistics are statistics published by government agencies or other public bodies such as international organizations as a public good. They provide quantitative or qualitative information on all major areas of citizens' lives, such as ...
, parks and
recreation Recreation is an activity of leisure, leisure being discretionary time. The "need to do something for recreation" is an essential element of human biology and psychology. Recreational activities are often done for enjoyment, amusement, or plea ...
al facilities,
law enforcement Law enforcement is the activity of some members of government who act in an organized manner to enforce the law by discovering, deterring, rehabilitating, or punishing people who violate the rules and norms governing that society. The term ...
agencies, and
emergency services Emergency services and rescue services are organizations that ensure public safety and health by addressing and resolving different emergencies. Some of these agencies exist solely for addressing certain types of emergencies, while others deal w ...
.


Etymology

The word "infrastructure" has been used in French since 1875 and in English since 1887, originally meaning "installations that form the basis for any operation or system". It is a
loanword A loanword (also loan word or loan-word) is a word at least partly assimilated from one language (the donor language) into another language. This is in contrast to cognates, which are words in two or more languages that are similar because ...
from French, where it was already used for establishing a roadbed of substrate material, required before railroad tracks or constructed pavement could be laid on top of it. The word is a combination of the
Latin Latin (, or , ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through ...
prefix "infra", meaning "below", as many of these constructions are underground (for example, tunnels, water and gas systems, and railways), and the French word "structure" (derived from the Latin word "structure"). The army use of the term achieved currency in the United States after the formation of
NATO The North Atlantic Treaty Organization (NATO, ; french: Organisation du traité de l'Atlantique nord, ), also called the North Atlantic Alliance, is an intergovernmental military alliance between 30 member states – 28 European and two N ...
in the 1940s, and by 1970 was adopted by
urban planners An urban planner (also known as town planner) is a professional who practices in the field of town planning, urban planning or city planning. An urban planner may focus on a specific area of practice and have a title such as city planner, town ...
in its modern civilian sense.


Classifications

A 1987 US National Research Council panel adopted the term " public works infrastructure", referring to:
"... both specific functional modes – highways, streets, roads, and bridges; mass transit; airports and airways;
water supply Water supply is the provision of water by public utilities, commercial organisations, community endeavors or by individuals, usually via a system of pumps and pipes. Public water supply systems are crucial to properly functioning societies. Th ...
and water resources; wastewater management; solid-waste treatment and disposal; electric power generation and transmission; telecommunications; and
hazardous waste management Hazardous waste is waste that has substantial or potential threats to public health or the environment. Hazardous waste is a type of dangerous goods. They usually have one or more of the following hazardous traits: ignitability, reactivity, c ...
– and the combined system these modal elements comprise. A comprehension of infrastructure spans not only these public works facilities, but also the operating procedures, management practices, and development policies that interact together with societal demand and the physical world to facilitate the transport of people and goods, provision of water for drinking and a variety of other uses, safe disposal of society's waste products, provision of energy where it is needed, and transmission of information within and between communities."
The
American Society of Civil Engineers American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the "United States" or "America" ** Americans, citizens and nationals of the United States of America ** American ancestry, p ...
publishes an "Infrastructure Report Card" which represents the organizations opinion on the condition of various infrastructure every 2–4 years.2017 Infrastructure Report
112pp, American Society of Civil Engineers, 2017
they grade 16 categories, namely aviation, bridges, dams,
drinking water Drinking water is water that is used in drink or food preparation; potable water is water that is safe to be used as drinking water. The amount of drinking water required to maintain good health varies, and depends on physical activity level, ...
, energy, hazardous waste, inland waterways,
levee A levee (), dike (American English), dyke (Commonwealth English), embankment, floodbank, or stop bank is a structure that is usually earthen and that often runs parallel to the course of a river in its floodplain or along low-lying coastli ...
s, parks and
recreation Recreation is an activity of leisure, leisure being discretionary time. The "need to do something for recreation" is an essential element of human biology and psychology. Recreational activities are often done for enjoyment, amusement, or plea ...
, ports, rail, roads, schools, solid waste, transit and wastewater. The United States has received a rating of “D+” on its infrastructure. This aging infrastructure is a result of governmental neglect and inadequate funding. As the United States presumably looks to upgrade its existing infrastructure, sustainable measures could be a consideration of the design, build, and operation plans.


Personal

A way to embody personal infrastructure is to think of it in terms of human capital. Human capital is defined by the
Encyclopædia Britannica The (Latin for "British Encyclopædia") is a general knowledge English-language encyclopaedia. It is published by Encyclopædia Britannica, Inc.; the company has existed since the 18th century, although it has changed ownership various t ...
as “intangible collective resources possessed by individuals and groups within a given population". The goal of personal infrastructure is to determine the quality of the economic agents’ values. This results in three major tasks: the task of economic proxies in the economic process (teachers, unskilled and qualified labor, etc.); the importance of personal infrastructure for an individual (short and long-term consumption of education); and the social relevance of personal infrastructure. Essentially, personal infrastructure maps the human impact on infrastructure as it is related to the economy, individual growth, and social impact.


Institutional

Institutional infrastructure branches from the term "economic constitution". According to Gianpiero Torrisi, institutional infrastructure is the object of
economic An economy is an area of the production, distribution and trade, as well as consumption of goods and services. In general, it is defined as a social domain that emphasize the practices, discourses, and material expressions associated with th ...
and legal policy. It compromises the grown and sets norms. It refers to the degree of fair treatment of equal economic data and determines the framework within which economic agents may formulate their own economic plans and carry them out in co-operation with others.


Sustainable

Sustainable infrastructure refers to the processes of design and construction that take into consideration their environmental, economic, and social impact. Included in this section are several elements of sustainable schemes, including materials, water, energy, transportation, and waste management infrastructure. Although there are endless other factors of consideration, those will not be covered in this section.


Material

Material infrastructure is defined as “those immobile, non-circulating capital goods that essentially contribute to the production of infrastructure goods and services needed to satisfy basic physical and social requirements of
economic agent In economics, an agent is an actor (more specifically, a decision maker) in a model of some aspect of the economy. Typically, every agent makes decisions by solving a well- or ill-defined optimization or choice problem. For example, ''buyers' ...
s". There are two distinct qualities of material infrastructures: 1) fulfillment of
social needs Maslow's hierarchy of needs is an idea in psychology proposed by American psychologist Abraham Maslow in his 1943 paper "A Theory of Human Motivation" in the journal ''Psychological Review''. Maslow subsequently extended the idea to include his ob ...
and 2)
mass production Mass production, also known as flow production or continuous production, is the production of substantial amounts of standardized products in a constant flow, including and especially on assembly lines. Together with job production and ba ...
. The first characteristic deals with the basic needs of human life. The second characteristic is the non-availability of infrastructure goods and services. Today, there are various materials that can be used to build infrastructure. The most prevalent ones are asphalt, concrete, steel, masonry, wood, polymers and composites.


Economic

According to the business dictionary, economic infrastructure can be defined as "internal facilities of a country that make business activity possible, such as communication, transportation and distribution networks, financial institutions and
markets Market is a term used to describe concepts such as: *Market (economics), system in which parties engage in transactions according to supply and demand *Market economy *Marketplace, a physical marketplace or public market Geography *Märket, an ...
, and
energy supply Energy supply is the delivery of fuels or transformed fuels to point of consumption. It potentially encompasses the extraction, transmission, generation, distribution and storage of fuels. It is also sometimes called energy flow. This supply of ...
systems". Economic infrastructure support productive activities and events. This includes roads, highways, bridges, airports, cycling infrastructure, water distribution networks, sewer systems, and
irrigation Irrigation (also referred to as watering) is the practice of applying controlled amounts of water to land to help grow crops, landscape plants, and lawns. Irrigation has been a key aspect of agriculture for over 5,000 years and has been devel ...
plants.


Social

Social infrastructure can be broadly defined as the construction and maintenance of facilities that support
social services Social services are a range of public services intended to provide support and assistance towards particular groups, which commonly include the disadvantaged. They may be provided by individuals, private and independent organisations, or adminis ...
. Social infrastructures are created to increase social comfort and promote economic activity. These include schools, parks and
playground A playground, playpark, or play area is a place designed to provide an environment for children that facilitates play, typically outdoors. While a playground is usually designed for children, some are designed for other age groups, or people ...
s, structures for public safety,
waste Waste (or wastes) are unwanted or unusable materials. Waste is any substance discarded after primary use, or is worthless, defective and of no use. A by-product, by contrast is a joint product of relatively minor economic value. A waste pr ...
disposal plants, hospitals, and sports areas.


Core

Core assets provide essential services and have monopolistic characteristics. Investors seeking core infrastructure look for five different characteristics: income, low volatility of returns, diversification, inflation protection, and long-term liability matching. Core infrastructure incorporates all the main types of infrastructure, such as roads, highways, railways, public transportation, water, and gas supply.


Basic

Basic infrastructure refers to main railways, roads, canals, harbors and docks, the electromagnetic telegraph, drainage, dikes, and land reclamation. It consist of the more well-known and common features of infrastructure that we come across in our daily lives (buildings, roads, docks).


Complementary

Complementary infrastructure refers to things like light railways, tramways, and gas/electricity/water supply. To complement something means to bring it to perfection or complete it. Complementary infrastructure deals with the little parts of the engineering world that make life more convenient and efficient. They are needed to ensure successful usage and marketing of an already finished product, like in the case of road bridges. Other examples are lights on sidewalks, landscaping around buildings, and benches where pedestrians can rest.


Applications


Engineering and construction

Engineers generally limit the term "infrastructure" to describe
fixed assets A fixed asset, also known as long-lived assets or property, plant and equipment (PP&E), is a term used in accounting for assets and property that may not easily be converted into cash. Fixed assets are different from current assets, such as cas ...
that are in the form of a large network; in other words, hard infrastructure. Efforts to devise more generic definitions of infrastructures have typically referred to the network aspects of most of the structures, and to the accumulated value of investments in the networks as assets. One such definition from 1998 defined infrastructure as the network of assets "where the system as a whole is intended to be maintained indefinitely at a specified standard of service by the continuing replacement and refurbishment of its components".


Civil defense and economic development

Civil defense Civil defense ( en, region=gb, civil defence) or civil protection is an effort to protect the citizens of a state (generally non-combatants) from man-made and natural disasters. It uses the principles of emergency operations: prevention, mit ...
planners and developmental economists generally refer to both hard and soft infrastructure, including public services such as schools and
hospitals A hospital is a health care institution providing patient treatment with specialized health science and auxiliary healthcare staff and medical equipment. The best-known type of hospital is the general hospital, which typically has an emerge ...
,
emergency services Emergency services and rescue services are organizations that ensure public safety and health by addressing and resolving different emergencies. Some of these agencies exist solely for addressing certain types of emergencies, while others deal w ...
such as police and fire fighting, and basic services in the
economic sector One classical breakdown of economic activity distinguishes three sectors: * Primary: involves the retrieval and production of raw-material commodities, such as corn, coal, wood or iron. Miners, farmers and fishermen are all workers in the p ...
. The notion of
infrastructure-based development Infrastructure-based economic development, also called infrastructure-driven development, combines key policy characteristics inherited from the Rooseveltian progressivist tradition and neo-Keynesian economics in the United States, France's Gau ...
combining long-term infrastructure investments by government agencies at central and regional levels with public private partnerships has proven popular among economists in Asia (notably Singapore and China), mainland Europe, and Latin America.


Military

Military infrastructure is the buildings and permanent installations necessary for the support of military forces, whether they are stationed in bases, being deployed or engaged in operations. Examples include barracks, headquarters, airfields, communications facilities, stores of military equipment, port installations, and maintenance stations.


Communications

Communications infrastructure is the informal and formal channels of communication, political and
social network A social network is a social structure made up of a set of social actors (such as individuals or organizations), sets of dyadic ties, and other social interactions between actors. The social network perspective provides a set of methods fo ...
s, or beliefs held by members of particular groups, as well as information technology, software development tools. Still underlying these more conceptual uses is the idea that infrastructure provides organizing structure and support for the system or organization it serves, whether it is a city, a nation, a corporation, or a collection of people with common interests. Examples include IT infrastructure, research infrastructure, terrorist infrastructure, employment infrastructure, and tourism infrastructure.


Related concepts

The term "infrastructure" may be confused with the following overlapping or related concepts.
Land improvement Land development is the alteration of landscape in any number of ways such as: * Changing landforms from a natural or semi-natural state for a purpose such as agriculture or housing * Subdividing real estate into lots, typically for the purp ...
and land development are general terms that in some contexts may include infrastructure, but in the context of a discussion of infrastructure would refer only to smaller-scale systems or works that are not included in infrastructure, because they are typically limited to a single
parcel of land A cadastre or cadaster is a comprehensive recording of the real estate or real property's metes-and-bounds of a country.Jo Henssen, ''Basic Principles of the Main Cadastral Systems in the World,'/ref> Often it is represented graphically in a cad ...
, and are owned and operated by the landowner. For example, an irrigation canal that serves a region or district would be included with infrastructure, but the private irrigation systems on individual land parcels would be considered land improvements, not infrastructure. Service connections to municipal service and public utility networks would also be considered land improvements, not infrastructure. The term " public works" includes government-owned and operated infrastructure as well as public buildings, such as schools and courthouses. Public works generally refers to physical assets needed to deliver public services. Public services include both infrastructure and services generally provided by the government.


Ownership and financing

Infrastructure may be owned and managed by governments or by privately held companies, such as sole public utility or railway companies. Generally, most roads, major airports and other ports, water distribution systems, and sewage networks are publicly owned, whereas most energy and telecommunications networks are privately owned. Publicly owned infrastructure may be paid for from taxes, tolls, or metered user fees, whereas private infrastructure is generally paid for by metered user fees. Major investment projects are generally financed by the issuance of long-term bonds. Government-owned and operated infrastructure may be developed and operated in the
private sector The private sector is the part of the economy, sometimes referred to as the citizen sector, which is owned by private groups, usually as a means of establishment for profit or non profit, rather than being owned by the government. Employment The ...
or in public-private partnerships, in addition to in the
public sector The public sector, also called the state sector, is the part of the economy composed of both public services and public enterprises. Public sectors include the public goods and governmental services such as the military, law enforcement, inf ...
. in the United States for example, public spending on infrastructure has varied between 2.3% and 3.6% of GDP since 1950. Many financial institutions invest in infrastructure.


In the developing world

According to researchers at the Overseas Development Institute, the lack of infrastructure in many
developing countries A developing country is a sovereign state with a lesser developed industrial base and a lower Human Development Index (HDI) relative to other countries. However, this definition is not universally agreed upon. There is also no clear agreem ...
represents one of the most significant limitations to economic growth and achievement of the Millennium Development Goals (MDGs). Infrastructure investments and maintenance can be very expensive, especially in such areas as landlocked, rural and sparsely populated countries in Africa. It has been argued that infrastructure investments contributed to more than half of Africa's improved growth performance between 1990 and 2005, and increased investment is necessary to maintain growth and tackle poverty. The returns to investment in infrastructure are very significant, with on average thirty to forty percent returns for telecommunications ( ICT) investments, over forty percent for electricity generation, and eighty percent for roads.Christian K.M. Kingombe 2011
Mapping the new infrastructure financing landscape
. London: Overseas Development Institute


Regional differences

The demand for infrastructure both by consumers and by companies is much higher than the amount invested. There are severe constraints on the supply side of the provision of infrastructure in Asia. The infrastructure financing gap between what is invested in Asia-Pacific (around US$48 billion) and what is needed (US$228 billion) is around US$180 billion every year. In Latin America, three percent of GDP (around US$71 billion) would need to be invested in infrastructure in order to satisfy demand, yet in 2005, for example, only around two percent was invested leaving a financing gap of approximately US$24 billion. In Africa, in order to reach the seven percent annual growth calculated to be required to meet the
MDGs The Millennium Development Goals (MDGs) were eight international development goals for the year 2015 that had been established following the Millennium Summit of the United Nations in 2000, following the adoption of the United Nations Millenni ...
by 2015 would require infrastructure investments of about fifteen percent of GDP, or around US$93 billion a year. In fragile states, over thirty-seven percent of GDP would be required.


Sources of funding for infrastructure

The source of financing for infrastructure varies significantly across sectors. Some sectors are dominated by
government spending Government spending or expenditure includes all government consumption, investment, and transfer payments. In national income accounting, the acquisition by governments of goods and services for current use, to directly satisfy the individual ...
, others by overseas development aid (ODA), and yet others by
private Private or privates may refer to: Music * " In Private", by Dusty Springfield from the 1990 album ''Reputation'' * Private (band), a Denmark-based band * "Private" (Ryōko Hirosue song), from the 1999 album ''Private'', written and also recorde ...
investors. In California, infrastructure financing districts are established by local governments to pay for physical facilities and services within a specified area by using property tax increases. In order to facilitate investment of the private sector in developing countries' infrastructure markets, it is necessary to design risk-allocation mechanisms more carefully, given the higher risks of their markets. The spending money that comes from the government is less than it used to be. From the 1930s to 2019, the United States went from spending 4.2% of GDP to 2.5% of GDP on infrastructure. These under investments have accrued, in fact, according to the 2017 ASCE Infrastructure Report Card, from 2016 to 2025, infrastructure will be underinvested by $2 trillion. Compared to the global GDP percentages, The United States is tied for second-to-last place, with an average percentage of 2.4%. This means that the government spends less money on repairing old infrastructure and or on infrastructure as a whole. In
Sub-Saharan Africa Sub-Saharan Africa is, geographically, the area and regions of the continent of Africa that lies south of the Sahara. These include West Africa, East Africa, Central Africa, and Southern Africa. Geopolitically, in addition to the List of sov ...
, governments spend around US$9.4 billion out of a total of US$24.9 billion. In
irrigation Irrigation (also referred to as watering) is the practice of applying controlled amounts of water to land to help grow crops, landscape plants, and lawns. Irrigation has been a key aspect of agriculture for over 5,000 years and has been devel ...
, governments represent almost all spending. In transport and energy a majority of investment is government spending. In ICT and
water supply Water supply is the provision of water by public utilities, commercial organisations, community endeavors or by individuals, usually via a system of pumps and pipes. Public water supply systems are crucial to properly functioning societies. Th ...
and
sanitation Sanitation refers to public health conditions related to clean drinking water and treatment and disposal of human excreta and sewage. Preventing human contact with feces is part of sanitation, as is hand washing with soap. Sanitation syste ...
, the private sector represents the majority of capital expenditure. Overall, between them aid, the private sector, and non-
OECD The Organisation for Economic Co-operation and Development (OECD; french: Organisation de coopération et de développement économiques, ''OCDE'') is an intergovernmental organisation with 38 member countries, founded in 1961 to stimulate ...
financiers exceed government spending. The private sector spending alone equals state capital expenditure, though the majority is focused on ICT infrastructure investments. External financing increased in the 2000s (decade) and in Africa alone external infrastructure investments increased from US$7 billion in 2002 to US$27 billion in 2009. China, in particular, has emerged as an important investor.


Coronavirus implications

The 2020 COVID-19 pandemic has only exacerbated the underfunding of infrastructure globally that has been accumulating for decades. The pandemic has increased unemployment and has widely disrupted the economy. This has serious impacts on households, businesses, and federal, state and local governments. This is especially detrimental to infrastructure because it is so dependent on funding from government agencies—with state and local governments accounting for approximately 75% of spending on public infrastructure in the United States. Governments are facing enormous decreases in revenue, economic downturns, overworked health systems, and hesitant workforces, resulting in huge budget deficits across the board. However, they must also scale up public investment to ensure successful reopening, boost growth and employment, and green their economies. The unusually large scale of the packages needed for COVID-19 was accompanied by widespread calls for “greening” them to meet the dual goals of economic recovery and environmental sustainability. However, as of March 2021, only a small fraction of the G20 COVID-19 related fiscal measures was found to be climate friendly.


Sustainable infrastructure

Although it is readily apparent that much effort is needed to repair the economic damage inflicted by the Coronavirus epidemic, an immediate return to business as usual could be environmentally harmful, as shown by the 2007-08 financial crisis in the United States. While the ensuing economic slowdown reduced global greenhouse gas emissions in 2009, emissions reached a record high in 2010, partially due to governments' implemented economic stimulus measures with minimal consideration of the environmental consequences. The concern is whether this same pattern will repeat itself. The post-COVID-19 period could determine whether the world meets or misses the emissions goals of the 2015 Paris Agreement and limits global warming to 1.5 degrees C to 2 degrees C. Unfortunately, as a result of the COVID-19 epidemic, a host of factors could jeopardize a low-carbon recovery plan: this includes reduced attention on the global political stage (2020 UN Climate Summit has been postponed to 2021), the relaxing of environmental regulations in pursuit of economic growth, decreased oil prices preventing low-carbon technologies from being competitive, and finally, stimulus programs that take away funds that could have been used to further the process of decarbonization. Research suggests that a recovery plan based on lower-carbon emissions could not only make significant emissions reductions needed to battle climate change, but also create more economic growth and jobs than a high-carbon recovery plan would. A study published in the Oxford Review of Economic Policy, more than 200 economists and economic officials reported that “green” economic-recovery initiatives performed at least as well as less “green” initiatives. There have also been calls for an independent body could provide a comparable assessment of countries’ fiscal policies, promoting transparency and accountability at the international level. In addition, in an econometric study published in the Economic Modelling journal, an analysis on government energy technology spending showed that spending on the renewable energy sector created five more jobs per million dollars invested than spending on fossil fuels. Since sustainable infrastructure is more beneficial in both an economic and environmental context, it represents the future of infrastructure. Especially with increasing pressure from climate change and diminishing natural resources, infrastructure not only needs to maintain economic development and job development, and a high quality of life for residents, but also protect the environment and its natural resources.


Sustainable energy

Sustainable energy infrastructure includes types of renewable energy power plants as well as the means of exchange from the plant to the homes and businesses that use that energy. Renewable energy includes well researched and widely implemented methods such as wind, solar, and hydraulic power, as well as newer and less commonly used types of power creation such as fusion energy. Sustainable energy infrastructure must maintain a strong supply relative to demand, and must also maintain sufficiently low prices for consumers so as not to decrease demand. Any type of renewable energy infrastructure that fails to meet these consumption and price requirements will ultimately be forced out of the market by prevailing non renewable energy sources.


Sustainable water

Sustainable water infrastructure is focused on a community’s sufficient access to clean, safe drinking water. Water is a public good along with electricity, which means that sustainable water catchment and distribution systems must remain affordable to all members of a population. "Sustainable Water" may refer to a nation or community's ability to be self-sustainable, with enough water to meet multiple needs including agriculture, industry, sanitation, and drinking water. It can also refer to the holistic and effective management of water resources. Increasingly, policy makers and regulators are incorporating Nature-based solutions (NBS or NbS) into attempts to achieve sustainable water infrastructure.


Sustainable waste management

Sustainable waste management systems aim to minimize the amount of waste products produced by individuals and corporations. Commercial waste management plans have transitioned from simple waste removal plans into comprehensive plans focused on reducing the total amount of waste produced before removal. Sustainable waste management is beneficial environmentally, and can also cut costs for businesses that reduce their amount of disposed goods.


Sustainable transportation

Sustainable transportation includes a shift away from private, greenhouse gas emitting cars in favor of adopting methods of transportation that are either
carbon neutral Carbon neutrality is a state of net-zero carbon dioxide emissions. This can be achieved by balancing emissions of carbon dioxide with its removal (often through carbon offsetting) or by eliminating emissions from society (the transition to the " ...
or reduce carbon emissions such as bikes or electric bus systems. Additionally, cities must invest in the appropriate built environments for these ecologically preferable modes of transportation. Cities will need to invest in public transportation networks, as well as bike path networks among other sustainable solutions that incentivize citizens to use these alternate transit options. Reducing the urban dependency on cars is a fundamental goal of developing sustainable transportation, and this cannot be accomplished without a coordinated focus on both creating the methods of transportation themselves and providing them with networks that are equally or more efficient than existing car networks such as aging highway systems.


Sustainable materials

Another solution to transition into a more sustainable infrastructure is using more sustainable materials. A material is sustainable if the needed amount can be produced without depleting non-renewable resources. It also should have low environmental impacts by not disrupting the established steady-state equilibrium of it. The materials should also be resilient, renewable, reusable, and recyclable. Today, concrete is one of the most common materials used in infrastructure. There is twice as much concrete used in construction than all other building materials combined. It is the backbone of industrialization, as it is used in bridges, piers, pipelines, pavements, and buildings. However, while they do serve as a connection between cities, transportation for people and goods, and protection for land against flooding and erosion, they only last for 50 to 100 years. Many were built within the last 50 years, which means many infrastructures need substantial maintenance to continue functioning. However, concrete is not sustainable. The production of concrete contributes up to 8% of the world’s greenhouse gas emissions. A tenth of the world’s industrial water usage is from producing concrete. Even transporting the raw materials to concrete production sites adds to airborne pollution. Furthermore, the production sites and the infrastructures themselves all strip away agricultural land that could have been fertile soil or habitats vital to the ecosystem.


Green infrastructure

Green infrastructure is a type of sustainable infrastructure. Green infrastructure uses plant or soil systems to restore some of the natural processes needed to manage water and create healthier urban environments. In a more practical sense, it refers to a decentralized network of stormwater management practices, which includes green roofs, trees, bioretention and infiltration, and permeable pavement. Green infrastructure has become an increasingly popular strategy in recent years due to its effectiveness in providing ecological, economic, and social benefits—including positively impacting energy consumption, air quality, and carbon reduction and sequestration.


Green roofs

A green roof is a rooftop that is partially or completely covered with growing vegetation planted over a membrane. It also includes additional layers, including a root barrier and drainage and irrigation systems. There are several categories of green roofs, including extensive (have a growing media depth ranging from two to six inches) and intensive (have a growing media with a depth greater than six inches). One benefit of green roofs is that they reduce stormwater runoff because of its ability to store water in its growing media, reducing the runoff entering the sewer system and waterways, which also decreases the risk of combined sewer overflows. They reduce energy usage since the growing media provides additional insulation, reduces the amount of solar radiation on the roof’s surface, and provides evaporative cooling from water in the plants, which reduce the roof surface temperatures and heat influx. Green roofs also reduce atmospheric carbon dioxide since the vegetation sequesters carbon and, since they reduce energy usage and the urban heat island by reducing the roof temperature, they also lower carbon dioxide emissions from electricity generation.


Tree planting

Tree planting provides a host of ecological, social, and economic benefits. Trees can intercept rain, support infiltration and water storage in soil, diminish the impact of raindrops on barren surfaces, minimize soil moisture through transpiration, and they help reduce stormwater runoff. Additionally, trees contribute to recharging local aquifers and improve the health of watershed systems. Trees also reduce energy usage by providing shade and releasing water into the atmosphere which cools the air and reduces the amount of heat absorbed by buildings. Finally, trees improve air quality by absorbing harmful air pollutants reducing the amount of greenhouse gases.


Bioretention and infiltration practices

There are a variety of types of bioretention and infiltration practices, including
rain garden Rain gardens, also called bioretention facilities, are one of a variety of practices designed to increase rain runoff reabsorption by the soil. They can also be used to treat polluted stormwater runoff. Rain gardens are designed landscape sites ...
s and bioswales. A rain garden is planted in a small depression or natural slope and includes native shrubs and flowers. They temporarily hold and absorb rain water and are effective in removing up to 90% of nutrients and chemicals and up to 80% of sediments from the runoff. As a result, they soak 30% more water than conventional gardens. Bioswales are planted in paved areas like parking lots or sidewalks and are made to allow for overflow into the sewer system by trapping silt and other pollutants, which are normally left over from impermeable surfaces. Both rain gardens and bioswales mitigate flood impacts and prevent stormwater from polluting local waterways; increase the usable water supply by reducing the amount of water needed for outdoor irrigation; improve air quality by minimizing the amount of water going into treatment facilities, which also reduces energy usage and, as a result, reduces air pollution since less greenhouse gases are emitted.


Smart cities

Smart cities use innovative methods of design and implementation in various sectors of infrastructure and planning to create communities that operate at a higher level of relative sustainability than their traditional counterparts. In a sustainable city,
urban resilience Urban resilience has conventionally been defined as the "measurable ability of any urban system, with its inhabitants, to maintain continuity through all shocks and stresses, while positively adapting and transforming towards sustainability". Ther ...
as well as infrastructure reliability must both be present. Urban resilience is defined by a city’s capacity to quickly adapt or recover from infrastructure defects, and infrastructure reliability means that systems must work efficiently while continuing to maximize their output. When urban resilience and infrastructure reliability interact, cities are able to produce the same level of output at similarly reasonable costs as compared to other non sustainable communities, while still maintaining ease of operation and usage.


Masdar City

Masdar City is a proposed zero emission smart city that will be contracted in the United Arab Emirates. Some individuals have referred to this planned settlement as “utopia-like”, due to the fact that it will feature multiple sustainable infrastructure elements, including energy, water, waste management, and transportation. Masdar City will have a power infrastructure containing renewable energy methods including solar energy. Masdar City is located in a desert region, meaning that sustainable collection and distribution of water is dependent on the city’s ability to use water at innovative stages of the water cycle. The city will use groundwater, greywater, seawater, blackwater, and other water resources to obtain both drinking and landscaping water. Initially, Masdar City will be waste-free. Recycling and other waste management and waste reduction methods will be encouraged. Additionally, the city will implement a system to convert waste into fertilizer, which will decrease the amount of space needed for waste accumulation as well as provide an environmentally friendly alternative to traditional fertilizer production methods. No cars will be allowed in Masdar City, contributing to low carbon emissions within the city boundaries. Instead, alternative transportation options will be prioritized during infrastructure development. This means that a bike lane network will be accessible and comprehensive, and other options will also be available.


See also

*
Airport infrastructure An airport is an aerodrome with extended facilities, mostly for commercial air transport. Airports usually consists of a landing area, which comprises an aerially accessible open space including at least one operationally active surfa ...
* Asset Management Plan * Green infrastructure *
Infrastructure as a service The first major provider of infrastructure as a service (IaaS) was Amazon in 2008. IaaS is a cloud computing service model by means of which computing resources are supplied by a cloud services provider. The IaaS vendor provides the storage, net ...
* Infrastructure asset management * Infrastructure security *
Logistics Logistics is generally the detailed organization and implementation of a complex operation. In a general business sense, logistics manages the flow of goods between the point of origin and the point of consumption to meet the requirements of ...
* Megaproject * Project finance * Pseudo-urbanization * Public capital *
Sustainable architecture Sustainable architecture is architecture that seeks to minimize the negative environmental impact of buildings through improved efficiency and moderation in the use of materials, energy, development space and the ecosystem at large. Sustainable ...
* Sustainable engineering


References


Bibliography

* Koh, Jae Myong (2018) ''Green Infrastructure Financing: Institutional Investors, PPPs and Bankable Projects'', London: Palgrave Macmillan. . * Nurre, Sarah G. "Restoring infrastructure systems: An integrated network design and scheduling (INDS) problem." ''European Journal of Operational Research''. (12/2012), 223 (3), pp. 794–806. * * Larry W. Beeferman, "Pension Fund Investment in Infrastructure: A Resource Paper", ''Capital Matter'' (Occasional Paper Series), No. 3 December 2008 * A. Eberhard, "Infrastructure Regulation in Developing Countries", ''PPIAF Working Paper No. 4'' (2007) World Bank * M. Nicolas J. Firzli and Vincent Bazi, "Infrastructure Investments in an Age of Austerity: The Pension and Sovereign Funds Perspective", published jointly in ''Revue Analyse Financière'', Q4 2011 issue, pp. 34–37 and USAK/JTW July 30, 2011 (online edition) * * * Georg Inderst, "Pension Fund Investment in Infrastructure", ''OECD Working Papers on Insurance and Private Pensions'', No. 32 (2009) *


External links


Body of Knowledge on Infrastructure Regulation

Next Generation Infrastructures international research programme

Report Card on America's Infrastructure

Dirk van Laak: ''Infrastructures''
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