An Intercomparison Study of NEXRAD Facility Performance for Use in Sewer System Modeling

Vieux, Baxter E.; Vallabhaneni, Srinivas; Moisio, Susan; Donovan, Steve

doi:10.1061/40644(2002)247

Cited by 3 publications

(3 citation statements)

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“…Whether radar is being used for a single event analysis, or long-term continuous (annual) support for modeling and system operation, it is worthwhile to review the radar facility. Radar facility analysis based on past events and operational characteristics is described by Vieux et al (2002). These factors can be just as important as the rain gauge network assessment for identification of characteristics affecting the accuracy of radar rainfall estimates over a particular location or watershed.…”

Section: Review Of Nexrad Facilities For Study Areamentioning

confidence: 99%

“…Vallabhaneni et al (2002) describe steps that can be taken for quality control and assurance (QA/QC) of rain gauge data to improve the accurate and reliability of the data before combining it with radar rainfall estimates. Assessment of radar facilities descn"bed by Vieux et al (2002) is performed before using data from a particular radar or set of radars. Adjustment of the radar using gauge data helps remove systematic error (called bias).…”

Section: Introductionmentioning

confidence: 99%

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Radar-Rainfall Technology Integration into Hydrologic and Hydraulic Modeling Projects

Vallabhaneni

Vieux²,

Meeneghan

2004

JWMM

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This chapter describes the background and methodology for integrating gauge and radar rainfall measurements into hydraulic and hydrologic modeling projects. Considering the importance of rainfall in modeling physical systems such as watersheds or sewer systems, attention to the accuracy, precision, spatial resolution, and processing protocol is essential for successful project completion. Using rain gauge network to adjust radar rainfall requires assessment of the rain gauge network and historical data that can help ensure accurate and reliable data. Radar is growing in acceptance in the management, monitoring, and design of sewer system improvements. Important aspects of how radar measures rainfall include understanding how measured reflectivity is converted to rainfall rates and then adjusted using rain gauges. Limitations and advantages of incorporating this data source depends on quality control and assurance procedures applied by project personnel and by the operators of the radar. The NEXRAD (WSR-880) radar deployed in the U.S. is a nationwide system that can be used in urban drainage system applications with appropriate postand real-time processing. Services are available that provide both real-time products useful in sewer system management and real-time control. Retrospective studies are possible for reconstructing events using radar data from multiple or single radar installations, and for which flow monitored data was collected. Comparison ofhydrographs produced using rain gauges versus radar reveals that radar is capable of producing accurate hydrographs. Calibrating hydraulic models to account for infiltration and inflow induced by rainfall is

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Section: Review Of Nexrad Facilities For Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Radar-Rainfall Technology Integration into Hydrologic and Hydraulic Modeling Projects

Vallabhaneni

Vieux²,

Meeneghan

2004

JWMM

Self Cite

View full text Add to dashboard Cite

show abstract

“…In recent years there have been attempts to integrate radar rainfall data in water resources management for relatively small spatial domains [i.e., Ͻ100 km 2 ; see, e.g., Vieux et al (2002)]. The WSR precipitation products being investigated for these purposes are often those provided by the National Weather Service (NWS) for operational streamflow forecasting [e.g., stage III and the Multisensor Precipitation Estimate; Vieux et al (2002)]. Despite the fact that these radar datasets have been adjusted against rain gauge records (Fulton et al 1998), the concern about their accuracy remains.…”

Section: Introductionmentioning

confidence: 99%

Subpixel-Scale Rainfall Variability and the Effects on Separation of Radar and Gauge Rainfall Errors

Zhang

Adams

Bonta

2007

Journal of Hydrometeorology

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This paper presents an extended error variance separation method (EEVS) that allows explicit partitioning of the variance of the errors in gauge-and radar-based representations of areal rainfall. The implementation of EEVS demonstrated in this study combines a kriging scheme for estimating areal rainfall from gauges with a sampling method for determining the correlation between the gauge-and radar-related errors. On the basis of this framework, this study examines scale-and pixel-dependent impacts of subpixelscale rainfall variability on the perceived partitioning of error variance for four conterminous Hydrologic Rainfall Analysis Project (HRAP) pixels in central Ohio with data from Next-Generation Weather Radar (NEXRAD) stage III product and from 11 collocated rain gauges as input. Application of EEVS for 1998-2001 yields proportional contribution of two error terms for July and October for each HRAP pixel and for two fictitious domains containing the gauges (4 and 8 km in size). The results illustrate the importance of considering subpixel variation of spatial correlation and how it varies with the size of domain size, number of gauges, and the subpixel locations of gauges. Further comparisons of error variance separation (EVS) and EEVS across pixels results suggest that accounting for structured variations in the spatial correlation under 8 km might be necessary for more accurate delineation of domain-dependent partitioning of error variance, and especially so for the summer months.

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NEXRAD Radar Rainfall: Meeting User Requirements for Design and Real-Time Hydrologic Applications

Vieux¹,

Vieux²

2004

Critical Transitions in Water and Environmental Resources Management

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An Intercomparison Study of NEXRAD Facility Performance for Use in Sewer System Modeling

Cited by 3 publications

References 1 publication

Radar-Rainfall Technology Integration into Hydrologic and Hydraulic Modeling Projects

Radar-Rainfall Technology Integration into Hydrologic and Hydraulic Modeling Projects

Subpixel-Scale Rainfall Variability and the Effects on Separation of Radar and Gauge Rainfall Errors

NEXRAD Radar Rainfall: Meeting User Requirements for Design and Real-Time Hydrologic Applications

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