UARLUkrainian Amateur Radio League
UARLUnavoidable Annual Real Loss
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It is just a question of how high these UARL will be.
UARL (litres/day) = (18 x Lm + 0.8 x Nc + 25 x Lp) x P (1)
With current knowledge and experience, UARL can be calculated for any system with more than 5000 service connections, density of connections greater than 20 per km mains, and operating pressure between 25-100 metres.
The ratio of the CARL to the UARL (ILI) is a measure of how well the three infrastructure management functions--repairs, pipelines and asset management, active leakage control--are being undertaken separates from the aspects of pressure management.