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Title: Measuring Flowrates In Partially-Filled Pipes In Siphonic Roof Drainage Systems
Author: Ying Yan Qu1, Terry Lucke2, Simon Beecham1
Source: Flomeko 2010
Year Published: 2010
Abstract: While a variety of flow measurement devices are available to measure the flowrate of water through closed pipe systems, these devices generally only function correctly when the pipes are completely full of water. Accurate measurement of water flowrates in partially-filled pipes is extremely difficult. In siphonic drainage systems, this problem is further compounded by the unsteady flow conditions that occur in the pipework during the priming process. This has been a major obstacle to understanding the performance of these systems in practice. In order to accurately model the priming process in multi-outlet siphonic roof drainage systems, a method of estimating the instantaneous flowrates through the partially-filled individual pipes needs to be developed

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