![]() ![]() ![]() The volumetric weir is a compound weir that incorporates the advantage of a 90° V notch for measuring small infiltration flows where accuracy is imperative. These isolated lines with significant flows during the early morning hours are most likely to have substantial infiltration.Ī volumetric calibrated weir is a portable flow-measuring device used to measure infiltration in newly installed and existing sewer lines. The line segments tested must have all upstream lines plugged or isolated with other tests. The test evaluates isolated sewer lines of approximately 1,000 linear feet. Theoretically, the sewer flows should be virtually zero at this time. Our crew performs this task in the sewer system during early morning hours, between midnight and 5:00 a.m. This task aims to isolate sewer line segments and measure the suspected infiltration. By subtracting average flow from the wet weather flow response, we can measure how much I & I is getting into the system.Īn essential tool used in sewer evaluations, night flow isolation, measures possible infiltration in sewer lines. Once the data is received, the average daily flow is compared to the wet weather reaction to rainfall events of different intensities and totals. It can also be used by engineers to provide hydraulic modeling, design and evaluate conveyance systems, pump stations, and treatment facilities.Īfter installing flow meters within various basins or sub-basins, we collect information during dry days and wet weather days. The data can then be used to prioritize future inspections to identify the I & I sources. CES Flow Monitoring Project Manager, Andy Stuttsįlow Monitoring is a complex, high tech undertaking that forms part of a comprehensive sewer system evaluation survey (SSES). Typically the first step in a complete SSES project, flow monitoring is the process of analyzing the hydraulic characteristics of a sewer system.įlow monitoring supplies the data required to quantify inflow and infiltration (I & I) of sub-basins throughout the collection system.
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