Explanatory Notes on Main Statistical Indicators

Production Capacity of Water Supply refers to the designed comprehensive production capacity of water facilities, covering the 4 links of water collection, purification, conveyance, and outflow through trunk pipelines. Increase capacity through transformation and innovation projects is included as well. The capacity is determined mainly on the weakest of the above-mentioned 4 links.

Length of Water Supply Pipelines at the Year-end refers to the total length of all the pipelines between the water pumps and the user’s water meters, excluding pipelines newly installed but not used yet.

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 the water consumption of households for daily life and the 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 in the boundary of cities, including households of urban residents and farmers, and public water supply stations.

Percentage 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:

Percentage of Population with access to Tap Water = Urban Population with Access to Tap Water / Urban Population ×100%

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.

Percentage 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:

Percentage of population with access to gas = (Urban population with access to gas / Urban population) ×100%

Length of Roads refers to the length of roads with paved surface including squares 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.

Area of Roads   is the summed of carriageway and sidewalk.

Urban Bridges refer to bridges built to cross over natural or man-made barriers, including bridges over rivers, overpasses for traffic and for pedestrian, underpasses for pedestrian, 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.

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

Area of Urban Gardens and Green Areas refers to the total area occupied for green projects at the end of the reference period, including public green land, green land in residential quarters, green land attached to institutions, protection green land, production green land, roadside green land and forest in scenic spots. It does not include the following:

(I) Greenery and plants on roofs, balconies, indoors and vertical green areas;

(II) Forest, cultivated land, grassland, orchards and bamboo grooves that are for production purpose; and

(III) Water areas that are not included in urban master plan as green land.

Public Green Area  refers to green areas open to the public such as municipal, community and neighborhood parks and roadside parks, including waters within parks. Neighborhood parks should occupy an area larger than 10,000 square meters, and the width of roadside parks should occupy an area larger than 400 square meters, with a width of more that 8 meters.