Hrvatske vode, Vol. 25 No. 99, 2017.
Prethodno priopćenje
Comparison of different methods for expressing water losses with a review of their practical implementation in Croatia
Dražen Vouk
; Građevinski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Tea Martinac
; Institut IGH d.d., Zagreb, Hrvatska
Domagoj Nakić
; Građevinski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Sažetak
There are different methods for expressing water losses in water supply systems, which are presently used in the world. Water losses are most frequently expressed as a percentage of abstracted water quantity, a calculation of real and apparent losses as part of the standard water balance and calculation of the Infrastructure Leakage Index (ILI) according to the International Water Association (IWA) methodology. The ILI presents the relation between the real and unavoidable annual water losses. The paper offers a critical review of the reliability of the ILI in the analysis of water losses. By using specific examples, the paper proves that it is not reliable to draw concrete conclusions about the state of water losses or to define measures for improving integrated systems or individual district metering areas (DMAs) based on the ILI. In addition to the ILI calculation, numerous other methods of expressing and assessing water losses are also used, such as l/(connection per day), m3/(km pipeline per day), l/(connection per day mWC), m3/(km pipeline per day mWC), HRK/year, etc. In order to find the simplest and most reliable method for expressing water losses, this paper analyses relations between different methods for expressing water losses on five specific water supply systems in Croatia. It has been concluded that the most practical and efficient performance of economic analyses of water losses is when water losses are expressed in HRK/year, both for the system as a whole and separately for each individual DMA.
Ključne riječi
water losses; ILI indicator; economic value of losses; IWA methodology
Hrčak ID:
179292
URI
Datum izdavanja:
5.4.2017.
Posjeta: 2.235 *