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.

Number of Vehicles under Operation at Year-end refers to the total number of vehicles under operation by public transport enterprises (units) at the end of the year, based on the records of operational vehicles by the enterprises (units).

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.

Public Transportation Vehicles per 10000 Population   refers to the number of public transportation vehicles, at the end of the reference period, per 10000 population in the city district. The formula for calculation is: