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Rainfall Matters in Sewers Applications

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Effective hydraulic modeling of sewers depends on reliable rainfall and flow monitoring data to better characterize capacity and level of service during wet weather. When a service area covers more than several square miles, spatial variation of rainfall is significant. Capturing this variability can be achieved through a combination of radar and rain gauge measurements. However, data quality and sensor characteristics can be major determinants of rainfall accuracy and representativeness over sewer catchments. Six events were examined in detail and close agreement found between radar and rain gauge data based on storm event rainfall totals, peak hourly and peak 15–minute data. The combination of radar and rain gauge assists in the determination of performance issues affecting the quality of rain gauge data before its use in bias correction of the radar product. Besides rain gauge quality control, review of the radar data removes artifacts that appear in such as Anomalous Propagation (AP), excess clutter suppression, and bright-banding. Hydrometeorological review of the radar interaction with the atmosphere results in better rainfall information than could be achieved with either system alone.
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Keywords: Modeling; RDII; Radar; Rain Gauge; Rainfall; Sewer

Document Type: Research Article

Publication date: 2011-01-01

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