Explanatory Notes on Main Statistical
Indicators
Production Capacity of Water Supply refers to the designed overall
production capacity of water facilities, covering the four segments of water
collection, purification, conveyance, and outflow through trunk pipelines.
Increased capacity through transformation and innovation projects is included
as well. The capacity is determined mainly on the weakest of the
above-mentioned four segments.
Length of Water Supply Pipelines at Year-end refers to the
total length of all the pipelines between the water pumps and the user water
meters, excluding pipelines newly installed but not used yet, pipeline in the
water factory,and pipeline in the user’s buildings.
Annual Volume of Water Supply refers to the total volume of water
supplied by water-works (units) during the reference period, including both the
effective water supply and loss during the water supply.
Consumption of Water for Residential Use refers to water
consumption of households for daily life and water consumption of public
service facilities. The latter refers to water consumption for urban public
services, including the consumption of government agencies and public
institutions, military barracks, public facilities, wholesale and retail
outlets, restaurants, hotels, and other units providing public services.
Household water consumption refers to consumption of water for daily life of
all households within the boundary of cities, including households of urban
residents and farmers, and public water supply stations.
Coverage Rate of Urban Population with Access to Tap Water refers to the
ratio of the urban population with access to tap water to the total urban
population. The formula is:

Production Capacity of Gaswork Gas refers to the overall production
capacity of the urban gasworks in gas generation, purification and delivery at
the end of the reference period, excluding capacity of the reserved facilities.
In general, it is determined by the designed capacity, and when actual
production capacity is larger than the designed capacity, the capacity is
determined by the actual measurement on the weakest segment in the production,
purification and delivery.
Length of Gas Pipelines refers to the total length of pipelines
in use between the outlet of the compressor of gas-work or outlet of gas
stations and the leading pipe of users, excluding pipelines within gasworks,
delivery stations, LPG storage stations, refilling stations, gas-mixing
stations and supply stations.
Volume of Gas Supply refers to the total volume of gas
provided to users by gas-producing enterprises (units) in a year, including the
volume sold and the volume lost.
Coverage Rate of Urban Population with Access to Gas refers to the
ratio of the urban population with access to gas to the total urban population
at the end of the reference period. The formula is:

Heating Capacity in Urban Areas refers to the designed capacity of
heating enterprises (units) in supplying heating energy to urban users during
the reference period.
Quantity of Heat Supplied in Urban Areas refers to the
total quantity of heat from steam and hot water supplied to urban users by
heating enterprises (units) during the reference period.
Length of Urban Heating Pipelines refers to the total length of steam or
hot water pipelines for sources of heat to the leading pipelines of the
buildings of the users, excluding internal pipelines in heat generating
enterprises.
Length of Paved Roads at Year-end refers to the length of roads with paved
surface including bridges and tunnels connected with roads by the end of the
year. Length of the roads is
measured by the central lines for vehicles for paved roads with a width of 3.5
meters and over, including roads in open-ended factory compounds and
residential quarters.
Urban Bridges refer to bridges built to cross over
natural or man-made barriers, including bridges over rivers, overpasses for
traffic and for pedestrians, underpasses for pedestrians, etc. Both permanent
and semi-permanent bridges are included.
Length of Urban Sewage Pipes refers to the total length of general
drainage, trunks, branch and inspection wells, connection wells, inlets and
outlets, etc.
Daily Disposal Capacity of Urban Sewage refers to the
designed 24-hour capacity of sewage disposal by the sewage treatment works or
facilities.
Area of Urban Green Areas refers to the total area occupied for
green projects at the end of the reference period, including park green land,
production green land, protection green land, green land attached to
institutions, and other green areas.
Park Green Area refers to green areas open to the public
for amusement and rest with the facilities of amusement, rest and services. Its
function includes perfecting ecology, beautifying landscape, and preventing and
reducing disaster. Park green areas include comprehensive park, community park,
topic park, belt-shaped park and green area nearby street. Total areas of
comprehensive park, topic park and belt-shaped is the area of park.
Area Cleaned refers to the area which are regularly
cleaned, as at the end of the reference period, at urban roads and public
places (mainly including urban roadways, pedestrian walkways,
vehicular tunnels, pedestrian underpasses, underground
railway stations, lifted roads, pedestrians walk bridges, overpasses, plazas,
carparks and other facilities). If there are several times of cleaning in a day
at a location, the area of that time of cleaning with the largest area cleaned
will be taken.
Vehicles Dedicated to Urban Cleanliness and Environmental
Sanitation refer to vehicles and facilities
dedicated for use in the operation, management and monitoring of environmental
hygiene work. They include vehicles for road cleaning, washing, showering, ice
removal, disposal of garbage and human wastes, cleanliness monitoring and
related activities.