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Identifying and Correcting Rain Gauge Measurement Errors Using a Highly Accurate Hydrologic Model and Radar Reflectivity Data

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Obtaining accurate rainfall measurements is essential for any infiltration and inflow (I/I) modeling study as these measurements are primary inputs into the development of the hydrologic model used to evaluate the wet weather flows in the system. In the course of performing flow monitoring for an I/I modeling study, it is not uncommon to experience intermittent rain gauge failures during a flow monitoring period without significant consequence as these failures rarely occur during large storm events. However, such a rain gauge failure occurred during the flow monitoring period for the 2008 Scio Township I/I Modeling Study, and this failure was of significant consequence as it occurred during the largest storm event of the flow monitoring period. In most cases, even if the rain gauge failure had been identified, the storm event would have to be removed from the analysis due to the errant rainfall measurement; However, the comprehensive approach used for the 2008 Scio Township I/I Modeling Study that included the use of a highly accurate hydrologic model to identify the rainfall measurement error and radar reflectivity data to correct the error allowed for the use of the largest storm event to guide in the development of the hydrologic model despite the rain gauge failure.

Keywords: Radar Rainfall Analysis; Sanitary Collection Systems; Wet Weather Modeling

Document Type: Research Article


Publication date: January 1, 2010

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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