Collection, Purification and Distribution of Water

NOTES ON METHODOLOGY

Legal and methodological framework

Data on the public water supply are collected through the annual statistical survey entitled the Annual Survey on Water Supply System (VOD-2V form) on the basis of the Official Statistics Act (NN, No. 25/20).

Coverage

Reporting units are public water suppliers of public water services. According to the Water Act (NN, No. 66/19), the public water supplier of public water services is a company in which all shares or equity shares are held directly by local self-government units, that is, an institution founded by a local self-government unit. 

The report is filled in by legal entities and parts thereof registered according to the NKD 2007. (NN, Nos 58/07 and 72/07) in section E Water supply; sewerage, waste management and remediation activities, class 36.00 Water collection, purification and supply.

The source for the address list is the Statistical Business Register.

The survey provides data on water supplied and distributed from the public water mains, on water mains and facilities as well as on the number of pumping plants and water treatment plants installed in public water supply mains.

Definitions

Public water supply means the activity of abstracting groundwater and surface water intended for human consumption and its treatment, and delivery to the end user or another water service provider, if the above is conducted through public water supply facilities and management of the above facilities, or in some other way prescribed by law (tanks, aquifers, etc.).

Water supply from public water supply system is the total volume of water abstracted from ground waters (underground sources and springs),surface waters (watercourses, reservoirs and lakes) and the total volume of water abstracted from other water supply systems.

Abstracted volume of water is the total volume of water abstracted from all water sources. Water sources may be ground and surface ones. Public springs are all sources that are used in supplying of water mains, such as ground watercourses, springs, watercourses, reservoirs and lakes.

Distributed volume of water is the volume of water sold to consumers.

Total water losses are actually found losses in public water main network caused by mechanical troubles or installation defects on water mains.

The length of the public water main network consists of the length of water mains and the length of distribution network.

Length of water mains is the length of pipes used for the supply of water and reaching of the required pressure.

The length of distribution network is the length of the water supply network from a tank to a consumer (excluded are the length of connections and network in a building).

Water supply connecting pipes are connections that link the unparalleled street water supply network and a network in a building.

Hydrants are feed lines for fire protections powered from the supply or distribution network.

Public pumps are pumps for public use connected to a water supply.

Tanks can be divided into underground and elevated (tower-shaped). They are used for the accumulation of water and reaching the required pressure.

Pumping plants are buildings with associated electromechanical equipment by which the water is drawn and raised (pushed) to the pressure level needed to ensure the required distribution of water to consumers.

Drinking water treatment plants are devices for the purification (conditioning) and consist of sedimentation tank, filter, chlorinator, iron-removing plant and other facilities.

Abbreviations
km	kilometre
m^3	cubic metre
NKD 2007.	National Classification of Activities, 2007 version
NN	Narodne novine, official gazette of the Republic of Croatia
'000	thousand