Technical aspects of urban planning involve the technical processes, considerations and features that are involved in planning for land use, urban design, natural resources, transportation, and infrastructure.
In developed countries, there has been a backlash against excessive human-made clutter in the visual environment, such as signposts, signs, and hoardings. [1] Other issues that generate strong debate among urban designers are tensions between peripheral growth, housing density and new settlements. There are also debates about the mixing tenures and land uses, versus distinguishing geographic zones where different uses dominate. Regardless, all successful urban planning considers urban character, local identity, respects heritage, pedestrians, traffic, utilities and natural hazards.
Planners can help manage the growth of cities, applying tools like zoning and growth management to manage the uses of land. Historically, many of the cities now thought[ by whom? ] the most beautiful are the result of dense, long lasting systems of prohibitions and guidance about building sizes, uses and features. [2] These allowed substantial freedoms, yet enforce styles, safety, and often materials in practical ways. Many conventional planning techniques are being repackaged using the contemporary term smart growth.
There are some cities that have been planned from conception, and while the results often do not turn out quite as planned, evidence of the initial plan often remains. (See List of planned cities )
The 20th and 21st century trend for New Classical Architecture seeks to develop aesthetically pleasing smart growth in urban areas and to continue architectural tradition and classical design. [3] [4]
Historically within the Middle East, Europe and the rest of the Old World, settlements were located on higher ground (for defense) and close to fresh water sources.[ citation needed ] Cities have often grown onto coastal and flood plains at risk of floods and storm surges. Urban planners must consider these threats. If the dangers can be localised then the affected regions can be made into parkland or green belt, often with the added benefit of open space provision.
Extreme weather, flood, or other emergencies can often be greatly mitigated with secure emergency evacuation routes and emergency operations centres. These are relatively inexpensive and unintrusive, and many consider them a reasonable precaution for any urban space. Many cities will also have planned, built safety features, such as levees, retaining walls, and shelters.
In recent years,[ when? ] practitioners have also been expected to maximise the accessibility of an area to people with different abilities, practicing the notion of "inclusive design," to anticipate criminal behaviour and consequently to "design-out crime" and to consider "traffic calming" or "pedestrianisation" as ways of making urban life more pleasant.
Some city planners try to control criminality with structures designed from theories such as socio-architecture or architectural determinism a subset of environmental determinism. These theories say that an urban environment can influence individuals' obedience to social rules and level of power. Refer to Foucault and the Encyclopaedia of the Prison System for more details. The theories often say that psychological pressure develops in more densely developed, unadorned areas. This stress causes some crimes and some use of illegal drugs. The antidote is believed to be more individual space and better, more beautiful design in place of functionalism.[ citation needed ]
Oscar Newman's defensible space theory cites the modernist housing projects of the 1960s as an example of environmental determinism, where large blocks of flats are surrounded by shared and disassociated public areas, which are hard for residents to identify with. As those on lower incomes cannot hire others to maintain public space such as security guards or grounds keepers, and because no individual feels personally responsible, there was a general deterioration of public space leading to a sense of alienation and social disorder.
Jane Jacobs is another notable environmental determinist and is associated with the "eyes on the street" concept. By improving ‘natural surveillance’ of shared land and facilities of nearby residents by literally increasing the number of people who can see it, and increasing the familiarity of residents, as a collective, residents can more easily detect undesirable or criminal behaviour, as, she argued, used to be the case in small traditional communities.
Jacobs went further, though, in emphasising the details in how to achieve this 'natural surveillance', in stressing the necessity of multiple uses on city streets, so that different people co-mingle with different stores and parks in a condensed part of city space. [5] By doing this, as well as by making city streets interesting, she theorised a continuous animation of social actions during an average city day, which would keep city streets interesting and well occupied throughout a 24-hour period. She presented the North End in Boston, Massachusetts, as an idealisation of this persistent occupation and tasking in a condensed city space, as a model for criminal control.
The "broken-windows" theory argues that small indicators of neglect, such as broken windows and unkempt lawns, promote a feeling that an area is in a state of decay. Anticipating decay, people likewise fail to maintain their own properties. The theory suggests that abandonment causes crime, rather than crime causing abandonment. [6]
Some planning methods might help an elite group to control ordinary citizens. Haussmann's renovation of Paris created a system of wide boulevards which prevented the construction of barricades in the streets and eased the movement of military troops. In Rome, the Fascists in the 1930s created ex novo many new suburbs in order to concentrate criminals and poorer classes away from the elegant town.
Urban decay is a process by which a city, or a part of a city, falls into a state of disrepair and neglect. It is characterised by depopulation, economic restructuring, property abandonment, high unemployment, fragmented families, political disenfranchisement, crime, and desolate urban landscapes.
During the 1970s and 1980s, urban decay was often associated with central areas of cities in North America and Europe. During this time, changes in global economies, demographics, transportation, and policies fostered urban decay. [7] Many planners spoke of "white flight" during this time. This pattern was different from the pattern of "outlying slums" and "suburban ghettos" found in many cities outside of North America and Western Europe, where central urban areas actually had higher real estate values.
Starting in the 1990s, many of the central urban areas in North America have been experiencing a reversal of the urban decay, with rising real estate values, smarter development, demolition of obsolete social housing and a wider variety of housing choices. [8] However, reversal of urban decay (gentrification) often causes housing affordability in the inner city to decrease, with the consequence that poorer residents are pushed out, often to older inner and middle ring suburbs. This "suburbanisation of poverty" has important implications for siting affordable housing, and transportation and social services planning.
The rapid urbanisation of the last century caused more slums in the major cities of the world, particularly in developing countries. Planning resources and strategies are needed to address the problems of slum development. Many planners are calling for slum improvement, particularly the Commonwealth Association of Planners. [9] When urban planners work on slums, they must cope with racial and cultural differences to ensure that racial steering does not occur.
Slums were often "fixed" by clearance. However, more creative solutions are beginning to emerge such as Nairobi's "Camp of Fire" program, where established slum-dwellers promise to build proper houses, schools, and community centres without government money, in return for land on which they have been illegally squatting on for 30 years. The "Camp of Fire" program is one of many similar projects initiated by Slum Dwellers International, which has programs in Africa, Asia, and South America. [10]
Areas devastated by war or invasion challenge urban planners. Resources are scarce. The existing population has needs. Buildings, roads, services and basic infrastructure like power, water and sewerage are often damaged, but with salvageable parts. Historic, religious or social centres also need to be preserved and re-integrated into the new city plan. A prime example of this is the capital city of Kabul, Afghanistan, which, after decades of civil war and occupation, has regions of rubble and desolation. Despite this, the indigenous population continues to live in the area, constructing makeshift homes and shops out of salvaged materials. Any reconstruction plan, such as Hisham Ashkouri's City of Light Development, needs to be sensitive to the needs of this community and its existing culture and businesses.
Urban reconstruction development plans must also work with government agencies as well as private interests to develop workable designs.
In the 21st century, countries in Asia and the Middle East have embarked on plans to build brand new large cities. [11] [12] [13] Masdar City, a new city in the UAE, cost $18 billion. [12]
One expert has said building a brand new city for 1 million people would be regarded as a "terrifying concept" in the United Kingdom [14] while in Asia brand new large cities are being built. [14]
Many of these new cities are built to use new technologies such as District cooling and automatic waste collection [15] in GIFT City [16] [17] or Personal Rapid Transit in Masdar City. [18]
Saudi Arabia is building 5 new cities to control congestion and sprawl in existing cities. [11] While India is building 7 new cities to provide space and facilities that are missing in existing cities, such as cycling paths, parks and public transport within a 10-minute walk to every office and home. [19]
Transport within urbanised areas presents unique problems. The density of an urban environment increases traffic, which can harm businesses and increase pollution unless properly managed. Parking space for private vehicles requires the construction of large parking garages in high density areas. This space could often be more valuable for other development.
Good planning uses transit oriented development, which attempts to place higher densities of jobs or residents near high-volume transportation. For example, some cities permit commerce and multi-story apartment buildings only within one block of train stations and multilane boulevards, and accept single-family dwellings and parks farther away.
Floor area ratio is often used to measure density. This is the floor area of buildings divided by the land area. Ratios below 1.5 are low density. Ratios above five constitute very high density. Most exurbs are below two, while most city centres are well above five. Walk-up apartments with basement garages can easily achieve a density of three. Skyscrapers easily achieve densities of thirty or more.
City authorities may try to encourage higher densities to reduce per-capita infrastructure costs. In the UK, recent years have seen a concerted effort to increase the density of residential development in order to better achieve sustainable development. Increasing development density has the advantage of making mass transport systems, district heating and other community facilities (schools, health centres, etc.) more viable.
Problems can often occur at residential densities between about two and five. [20] These densities can cause traffic jams for automobiles, yet are too low to be commercially served by trains or light rail systems. The conventional solution is to use buses, but these and light rail systems may fail where automobiles and excess road network capacity are both available, achieving less than 2% ridership. [21]
The Lewis–Mogridge Position claims that increasing road space is not an effective way of relieving traffic jams as latent or induced demand invariably emerges to restore a socially tolerable level of congestion.
In some countries, declining satisfaction with the urban environment is held to blame for continuing migration to smaller towns and rural areas (so-called urban exodus). Successful urban planning supported Regional planning can bring benefits to a much larger hinterland or city region and help to reduce both congestion along transport routes and the wastage of energy implied by excessive commuting.
Environmental protection and conservation are of utmost importance to many planning systems across the world. Not only are the specific effects of development to be mitigated, but attempts are made to minimise the overall effect of development on the local and global environment. This is commonly done through the assessment of Sustainable urban infrastructure and microclimate.
The primary purpose of zoning is to segregate uses that are thought to be incompatible. In practice, zoning is used to prevent new development from interfering with existing residents or businesses and to preserve the "character" of a community. Zoning is commonly controlled by local governments such as counties or municipalities, though the nature of the zoning regime may be determined or limited by state or national planning authorities or through enabling legislation. [22] In Australia, land under the control of the Commonwealth (federal) government is not subject to state planning controls. The United States and other federal countries are similar. Zoning and urban planning in France and Germany are regulated by national or federal codes. In the case of Germany this code includes contents of zoning plans as well as the legal procedure.
Zoning may include regulation of the kinds of activities which will be acceptable on particular lots (such as open space, residential, agricultural, commercial or industrial), the densities at which those activities can be performed (from low-density housing such as single family homes to high-density such as high-rise apartment buildings), the height of building process is known as a Sustainability Appraisal.
The urban canyon effect is a colloquial, non-scientific term referring to street space bordered by very high buildings. This type of environment may shade the sidewalk level from direct sunlight during most daylight hours. While an oft-decried phenomenon, it is rare except in very dense, hyper-tall urban environments, such as those found in Lower and Midtown Manhattan, Chicago's Loop and Hong Kong's Kowloon and Central.
In urban planning, sound is usually measured as a source of pollution. Another perspective on urban sounds is developed in Soundscape studies emphasising that sound aesthetics involves more than noise abatement and decibel measurements. Hedfors [23] coined 'Sonotope' as a useful concept in urban planning to relate typical sounds to a specific place.
Light pollution has become a problem in urban residential areas, not only as it relates to its effects on the night sky, but as some lighting is so intrusive as to cause conflict in the residential areas and paradoxically intense improperly installed security lighting may pose a danger to the public, producing excessive glare. The development of the full cutoff fixture, properly installed, has reduced this problem considerably.
Water and sanitation services are key considerations in the planning of cities. This encompasses water provision, waste-water treatment, and sewage infrastructure. These services are crucial for public health – thus, one aspect of urban planning is to consider how to best provide these services to urban residents in effective and cost-sensitive ways.
Within urban environments, there are a number of disparities with regards to access to these services. For example, as of 2006, among the poorest quartile of the urban population in India, over 80% lacked access to piped water at home and over half did not have sanitary flushes or pit toilets. [24] Data collected in 2005–2006 revealed that under half of the urban poor could access adequate sanitation compared to about 95% of the urban non-poor. [25] In India, slums compose a major part of the urban environment – one of the largest barriers to improving slum conditions is that many slums go undocumented. Because most slums are informal settlements with no tenure rights, their illegal status excludes them from official listings and thus excludes them from access to municipal water and sanitation services. [26]
Economic status is highly correlated to water and sanitation service access in urban environments. But economic status is often tied to other demographic characteristics such as caste, ethnicity, and race. Therefore, access to water and sanitation services is an equity issue that faces urban planners working for urban governments. In the absence of policy to address these infrastructural disparities, the urban poor and minorities suffer disproportionately. A study of the social determinants of children's health in urban settings in India looked at data from India's National Family Health Survey and found that even within poor urban areas, caste status, religion, and sex are major factors which determine family employment and education level, factors which in turn affect access to sanitation and water. [27]
Water and sanitation issues relate directly to health outcomes due to the susceptibility to disease experienced by populations that lack adequate access. In the 19th and 20th centuries, diseases like cholera were particularly feared due to their devastating effects and due to their proliferation in areas with poor waste management practices. [28] Today diseases such as dengue fever, Hepatitis A, and intestinal parasites, are all examples of water-borne illnesses that affect the urban poor. Diarrheal illnesses are perhaps today the leading type of waterborne disease with cities like Jakarta experiencing disease rates as high as 50 cases per 1000 people. [29] In India, waterborne disease accounts for the loss of roughly 180 million person-workdays annually, the economic equivalent of approximately 12 billion rupees. [25] Thus inadequate access to water and sanitation among the urban poor and socially disadvantaged leads to systematic vulnerability to disease, which has both public health and economic consequences.
In Uganda, in order to address some of these access issues, NGOs and community-based organisations (CBOs) have stepped in. The government in Uganda has acknowledged the role of sanitation in improving public health among the poor, but as NGOs and CBOs have pointed out, the government has been unable to adequately address the need for these services in urban environments or the high cost of procuring these services from private service providers. [30] However, NGOs and CBOs are inherently limited in their ability to provide sanitation services due to the need to obtain permissions for undertaking infrastructure projects and due to the high costs of implementing them.
One aspect of sanitation infrastructure that is a major determinant of environmental health in slums is the latrine. There are a number of variables surrounding latrines and sewage which can play a critical role in determining health outcomes for urban families, including latrine location (in house versus out of house), latrine usage (family vs community), and latrine type (for example pit latrine versus toilet). Furthermore, the latrine is a critical aspect of urban household-level layouts and designs.
Waste-water collection and treatment has always been an important consideration in urban planning, but it is becoming increasingly critical as urban population levels rise and water conservation becomes a growing concern. Many planners are now considering how to properly incorporate waste-water treatment into urban environments in effective, and equitable ways.
In the US, prior to the 19th century, cities often used a de-centralised privy vault-cesspool model for waste management. Urban households had vaults or tubs beneath their latrines, which would collect waste-water until the vaults needed to be emptied into a nearby cesspool. This model worked at the time due to relatively low urban populations. However, industrialisation, urbanisation, and population growth during the 19th century led to a dramatic increase in America's city-dwelling population and thus increased the need for a centralised waste-water collection and processing system. [31] With the introduction of piped water, such a centralised system became possible as larger quantities of water were necessary for water-carriage waste removal. Since the 19th century, water-carriage sewage management has been preferred by planners due to its scalability.
However, more recently, de-centralised waste water management has made a resurgence among planners and researchers. While centralised water-carriage systems have more potential for scalability, de-centralised systems are simply more efficient because the waste-water is managed closer to where it is generated, thus allowing for each management system to be adapted to the local community/household needs. [32]
Urban design is an approach to the design of buildings and the spaces between them that focuses on specific design processes and outcomes. In addition to designing and shaping the physical features of towns, cities, and regional spaces, urban design considers 'bigger picture' issues of economic, social and environmental value and social design. The scope of a project can range from a local street or public space to an entire city and surrounding areas. Urban designers connect the fields of architecture, landscape architecture and urban planning to better organize physical space and community environments.
Urbanization is the population shift from rural to urban areas, the corresponding decrease in the proportion of people living in rural areas, and the ways in which societies adapt to this change. It can also mean population growth in urban areas instead of rural ones. It is predominantly the process by which towns and cities are formed and become larger as more people begin living and working in central areas.
In urban planning, zoning is a method in which a municipality or other tier of government divides land into "zones", each of which has a set of regulations for new development that differs from other zones. Zones may be defined for a single use, they may combine several compatible activities by use, or in the case of form-based zoning, the differing regulations may govern the density, size and shape of allowed buildings whatever their use. The planning rules for each zone determine whether planning permission for a given development may be granted. Zoning may specify a variety of outright and conditional uses of land. It may indicate the size and dimensions of lots that land may be subdivided into, or the form and scale of buildings. These guidelines are set in order to guide urban growth and development.
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 systems aim to protect human health by providing a clean environment that will stop the transmission of disease, especially through the fecal–oral route. For example, diarrhea, a main cause of malnutrition and stunted growth in children, can be reduced through adequate sanitation. There are many other diseases which are easily transmitted in communities that have low levels of sanitation, such as ascariasis, cholera, hepatitis, polio, schistosomiasis, and trachoma, to name just a few.
A slum is a highly populated urban residential area consisting of densely packed housing units of weak build quality and often associated with poverty. The infrastructure in slums is often deteriorated or incomplete, and they are primarily inhabited by impoverished people. Although slums are usually located in urban areas, in some countries they can be located in suburban areas where housing quality is low and living conditions are poor. While slums differ in size and other characteristics, most lack reliable sanitation services, supply of clean water, reliable electricity, law enforcement, and other basic services. Slum residences vary from shanty houses to professionally built dwellings which, because of poor-quality construction or lack of basic maintenance, have deteriorated.
Urban studies is the diverse range of disciplines and approaches to the study of all aspects of cities, their suburbs, and other urban areas. This includes among others: urban economics, urban planning, urban ecology, urban transportation systems, urban politics, sociology and urban social relations. This can be contrasted with the study of rural areas and rural lifestyles.
Urban renewal is a program of land redevelopment often used to address urban decay in cities. Urban renewal involves the clearing out of blighted areas in inner cities in favour of new housing, businesses, and other developments.
Land use planning or Land-use regulation is the process of regulating the use of land by a central authority. Usually, this is done to promote more desirable social and environmental outcomes as well as a more efficient use of resources. More specifically, the goals of modern land use planning often include environmental conservation, restraint of urban sprawl, minimization of transport costs, prevention of land use conflicts, and a reduction in exposure to pollutants. In the pursuit of these goals, planners assume that regulating the use of land will change the patterns of human behavior, and that these changes are beneficial. The first assumption, that regulating land use changes the patterns of human behavior is widely accepted. However, the second assumption - that these changes are beneficial - is contested, and depends on the location and regulations being discussed.
Dharavi is a residential area in Mumbai, Maharashtra, India. It has often been considered to be one of the world's largest slums. Dharavi has an area of just over 2.39 square kilometres and a population of about 1,000,000. With a population density of over 277,136/km2 (717,780/sq mi), Dharavi is one of the most densely populated areas in the world.
Night soil is a historically used euphemism for human excreta collected from cesspools, privies, pail closets, pit latrines, privy middens, septic tanks, etc. This material was removed from the immediate area, usually at night, by workers employed in this trade. Sometimes it could be transported out of towns and sold on as a fertilizer.
Mixed use is a type of urban development, urban design, urban planning and/or a zoning classification that blends multiple uses, such as residential, commercial, cultural, institutional, or entertainment, into one space, where those functions are to some degree physically and functionally integrated, and that provides pedestrian connections. Mixed-use development may be applied to a single building, a block or neighborhood, or in zoning policy across an entire city or other administrative unit. These projects may be completed by a private developer, (quasi-)governmental agency, or a combination thereof. A mixed-use development may be a new construction, reuse of an existing building or brownfield site, or a combination.
In 2020, 97.7% of Indians had access to the basic water and sanitation facilities. India faces challenges ranging from sourcing water for its megacities to its distribution network which is intermittent in rural areas with continuous distribution networks just beginning to emerge. Non-revenue water is a challenge.
Sustainable sanitation is a sanitation system designed to meet certain criteria and to work well over the long-term. Sustainable sanitation systems consider the entire "sanitation value chain", from the experience of the user, excreta and wastewater collection methods, transportation or conveyance of waste, treatment, and reuse or disposal. The Sustainable Sanitation Alliance (SuSanA) includes five features in its definition of "sustainable sanitation": Systems need to be economically and socially acceptable, technically and institutionally appropriate and protect the environment and natural resources.
A sanitation worker is a person responsible for cleaning, maintaining, operating, or emptying the equipment or technology at any step of the sanitation chain. This is the definition used in the narrower sense within the WASH sector. More broadly speaking, sanitation workers may also be involved in cleaning streets, parks, public spaces, sewers, stormwater drains, and public toilets. Another definition is: "The moment an individual’s waste is outsourced to another, it becomes sanitation work." Some organizations use the term specifically for municipal solid waste collectors, whereas others exclude the workers involved in management of solid waste sector from its definition.
Illegal housing in India consists of huts or shanties built on land not owned by the residents and illegal buildings constructed on land not owned by the builders or developers. Although illegal buildings may afford some basic services, such as electricity, in general, illegal housing does not provide services that afford for healthy, safe environments.
Open defecation is the human practice of defecating outside rather than into a toilet. People may choose fields, bushes, forests, ditches, streets, canals, or other open spaces for defecation. They do so either because they do not have a toilet readily accessible or due to archaic traditional cultural practices. The practice is common where sanitation infrastructure and services are not available. Even if toilets are available, behavior change efforts may still be needed to promote the use of toilets. 'Open defecation free' (ODF) is a term used to describe communities that have shifted to using toilets instead of open defecation. This can happen, for example, after community-led total sanitation programs have been implemented.
Urban planning is a technical and political process concerned with the use of land and design of the urban environment, including air, water, and the infrastructure passing into and out of urban areas such as transportation and distribution networks.
Urban planning, also known as town planning, city planning, regional planning, or rural planning in specific contexts, is a technical and political process that is focused on the development and design of land use and the built environment, including air, water, and the infrastructure passing into and out of urban areas, such as transportation, communications, and distribution networks, and their accessibility. Traditionally, urban planning followed a top-down approach in master planning the physical layout of human settlements. The primary concern was the public welfare, which included considerations of efficiency, sanitation, protection and use of the environment, as well as effects of the master plans on the social and economic activities. Over time, urban planning has adopted a focus on the social and environmental bottom lines that focus on planning as a tool to improve the health and well-being of people, maintaining sustainability standards. Similarly, in the early 21st century, Jane Jacobs's writings on legal and political perspectives to emphasize the interests of residents, businesses and communities effectively influenced urban planners to take into broader consideration of resident experiences and needs while planning.
Fecal sludge management (FSM) is the storage, collection, transport, treatment and safe end use or disposal of fecal sludge. Together, the collection, transport, treatment and end use of fecal sludge constitute the "value chain" or "service chain" of fecal sludge management. Fecal sludge is defined very broadly as what accumulates in onsite sanitation systems and specifically is not transported through a sewer. It is composed of human excreta, but also anything else that may go into an onsite containment technology, such as flushwater, cleansing materials, menstrual hygiene products, grey water, and solid waste. Fecal sludge that is removed from septic tanks is called septage.
Container-based sanitation refers to a sanitation system where toilets collect human excreta in sealable, removable containers that are transported to treatment facilities. This type of sanitation involves a commercial service which provides certain types of portable toilets, and delivers empty containers when picking up full ones. The service transports and safely disposes of or reuses collected excreta. The cost of collection of excreta is usually borne by the users. With suitable development, support and functioning partnerships, CBS can be used to provide low-income urban populations with safe collection, transport and treatment of excrement at a lower cost than installing and maintaining sewers. In most cases, CBS is based on the use of urine-diverting dry toilets.
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