**Author details**

Recently, it has been a frequent practice, that a water meter is installed on the inlet pipe of the storage tank near the building [10, 20-25]. Such water meters provide the opportunity to ensure a minimum period of time, at which water meter measurement error surely stays

By solving water quality problems in these storage tanks, the above mentioned conditions will, first and foremost, be provided in settlements already having such water supply net‐ works in place, e.g. in settlements without continuous potable water supply (e.g. in Mozam‐ bique, Yemen, Jordanian, Lebanon, Palestine, on the Mediterranean in Europe) and in water

According to pressure and water flow rate, the test rig in the Hydraulic Laboratory of the Faculty of Civil Engineering Subotica presented a case of a single household water pipeline. The water meters are produced by Potiski vodovodi Ltd. from Horgos with rated diameter of 20 mm, class B, and the following flow rate characteristics: the flow at starting the water

During accuracy measurements, water meter readings were 2.5 centilitres. Measurement ac‐

According to the measurement results, the most significant contribution of the UFR in meas‐ uring water volume by a water meter of a single household takes place at water losses by

The effects of UFR types T10 and T20 manufactured by ARI from Jerusalem on water meas‐

For calibration discharges, foreseen by the Protocol, through the testing of class B flow meter

**•** in the case, when consumption time was shorter than the time the meter was calibrated for, at discharges of , the range of the meter measuring error exceeded the range of per‐

**•** the biggest errors occur at Qmin - for example, at discharge lasting for 0.5 minute, the error may be even 32.1% (for water meter reading accuracy of 2.5 centilitres), or even 50.9% (for water meter reading accuracy of 1 decilitre), or even 277.4% (for water meter reading ac‐

/h. Upstream from water meter no. 3 an UFR was installed, manufactured by

/h, and

/h and Q3=0.0049-0.0053 m3

/h, Qmin=0.03 m3

/h.

/h, it has been established, that:

/h, Qt

=0.12 m3

/h and

supply networks designed in the XIXth century (e.g. the UK) [21, 23, 26-30].

A.R.I. from Jerusalem, with rated diameter of 20 mm, product type T30.

meter propeller (Qa) is between 0.0052 and 0.0067 m3

curacy of water quantity in the vessel was 0.005 kg.

flow rate Qa, prior to starting the water meter propeller:

with 20 mm rated diameter and discharge of Qn=1,5 m3

a) 70.57% at flow rates Q2=0 and Q3=0.005-0.0052 m3

b) 15.7% at flow rates Q2=0.03-0.0385 m3

mitted errors,

curacy of 1 litre), and

uring accuracy are less than that of type T30.

within the permitted error limit.

146 Water Supply System Analysis - Selected Topics

**5. Conclusion**

Qn=1.5 m3

Dr. Lajos Hovany\*

Address all correspondence to: hovanyl@gf.uns.ac.rs

Faculty of Civil Engineering Subotica, Republic of Serbia
