ISO37120 Water and Sanitation Theme Indicator Definitions
iso37120ws
http://ontology.eil.utoronto.ca/GCI/ISO37120/WaterAndSanitation.owl#
This ontology implements the definitions of the ISO37120 Water and Sanitation Theme Indicators using the following ontologys:
GCI Foundation Ontologies:
http://ontology.eil.utoronto.ca/GCI/Foundation/GCI-Foundation-v2.owl
(http://eil.utoronto.ca/smartcities/papers/GCI-Foundation-Ontology.pdf)
GCI Water and Sanitation Ontology:
http://ontology.eil.utoronto.ca/GCI/Energy/GCI-WaterAndSanitation.owl
Developed by the Enterprise Engineering Lab (eil.utoronto.ca), Mechanical & Industrial Engineering, University of Toronto.
Contact: Robson Navalta, robson.navalta@mail.utoronto.ca
Mark S. Fox, msf
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true
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false
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The average annual hours of water service interruption per household shall be calculated by taking the total sum of hours of interruption multiplied by the number of households impacted (numerator), divided by the number of households (denominator). The results shall be expressed as the average annual hours of water service interruption per household.
Incidents of complete shutoff, low flow restriction, boil water advisory, water main flushing, planned and unplanned interruptions shall be counted equally.
This indicator shall exclude:
- Incidents where there is some reduction to the level of service but where normal activities (shower, washing machine, toilet flushing etc.) are still possible, and
- Breaks in house connection branches.
An ‘unplanned interruption’ is an interruption caused by a fault in the utility’s system. A “planned interruption” is an interruption for which the utility has provided at least 24 h advanced notification (or as otherwise prescribed by regulatory requirements).
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The percentage of city population with potable water supply service shall be calculated as the total number of people with potable water supply service (numerator) divided by total city population (denominator). The result shall then be multiplied by 100 and expressed as a percentage of city population serviced by a potable water supply service.
The total number of people with potable water supply service shall be calculated as the total number of households in the city connected to a potable water supply service multiplied by the current average household size for the city.
Potable water shall refer to water that is treated or confirmed safe for human consumption. A potable water supply service shall refer to a service that delivers potable water through a pipe or similar duct that is connected to a network, the supply of which is relatively continuous given that it includes a deposit built for its storage. If a house or group of houses has a ‘mother’ pipe connected either provisionally or permanently; it shall be considered to have access to potable water.
A house shall not be considered to have access to potable water when an individual or group is served by a conduit system built with for example wood, bamboo, or rubber hose, connected directly to a river, well, or to another house.
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The percentage of city population with sustainable access to an improved water source shall be calculated as the total population with access to an improved water source (numerator) divided by the total city population. The result shall then be multiplied by 100 and expressed as a percentage.
An improved water source shall refer to piped water, public tap, borehole or pump, protected well, protected spring or rainwater.
The percentage of city population with sustainable access to an improved water source represents the percentage of the population with reasonable access to an adequate supply of safe water in their dwelling or within convenient distance of their dwelling. Reasonable access to water is defined as availability of at least 20 litres of water per person a day from a source within one kilometer of the dwelling.
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The percentage of population with access to improved sanitation shall be calculated as the total number of people using improved sanitation facilities (numerator) divided by the total city population (denominator). The result shall then be multiplied by 100 and expressed as a percentage.
Access to improved sanitation facilities shall refer to the percentage of the city population with at least adequate access to excreta disposal facilities that can effectively prevent human, animal and insect contact with excreta. Improved facilities range from simple, but protected pit latrines to flush toilets with a sewerage connection. To be effective, facilities must be correctly constructed and properly maintained.
Improved sanitation facilities shall include:
- Flush or pour-flush to piped sewer system, septic tank or pit latrine,
- Ventilated improved pit latrine,
- Pit latrine with slab and
- Composting toilet
NOTE: Sanitation facilities are not considered improved when shared with other households, or open to public use.
Unimproved sanitation shall include:
- Flush or pour-flush to elsewhere,
- Pit latrine without slab or open pit,
- Bucket, hanging toilet or hanging latrine and
- No facilities or bush or field (open defecation)”
The percentage of water loss (unaccounted for water) shall be calculated as the volume of water supplied minus the volume of utilized water (numerator) divided by the total volume of water supplied (denominator). The result shall then be multiplied by 100 and expressed as a percentage.
The percentage of water loss (unaccounted for water) represents the percentage of water that is lost from treated water entering distribution system and that is accounted for and billed by the water provider. This includes actual water losses, e.g. leaking pipes, and billing losses, e.g. delivered through informal or illegal connection.
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The total domestic water consumption per capita shall be calculated as the total amount of the city’s water consumption in litres per day for domestic use (numerator) divided by the total city population (denominator). The result shall be expressed as the total domestic water consumption per capita in litres per day.
Only water consumed for domestic purpose shall be taken into account. Water for industrial and commercial purposes shall be excluded.
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Total water consumption per capita (litres/day) shall be calculated as the total amount of the city’s water consumption in litres per day (numerator) divided by the total city population (denominator). The result shall be expressed as the total water consumption per capita in litres/days.