Development and testing of a modified transparent velocity-head rod for stream discharge measurements

Pike, Robin; Redding, Todd; Schwarz, Carl

doi:10.1080/07011784.2015.1127776

Cited by 6 publications

(9 citation statements)

References 3 publications

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“…Pike et al., (2016) estimated discharge measurements made with a VR to be typically within 10% of measurements made with an ADV, an improvement in accuracy over the 19.6% found in this study. Fonstad et al.…”

Section: Discussionsupporting

confidence: 52%

“…The improved accuracy in Pike et al. (2016) and the improved precision in Fonstad et al. (2005) may come from differences in velocity rod design and application.…”

Section: Discussionmentioning

confidence: 99%

“…Fonstad et al (2005) reported a precision of 5% for velocity measurements made with a VR, an improvement in precision relative to the 12% mean precision reported here. The improved accuracy in Pike et al (2016) and the improved precision in Fonstad et al (2005) may come from differences in velocity rod design and application.…”

Section: Comparison With Previous Studiesmentioning

confidence: 99%

“…2005; Pike et al. 2016). The basic premise is that the difference in water levels (head) between the upstream and downstream sides of a stationary object placed in an open channel is proportional to the water velocity following the Bernoulli Principle (Figure 3).…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Select Velocity Measurement Techniques for Estimating Discharge in Small Streams across the United States

King

Hundt

Simonson

et al. 2022

J American Water Resour Assoc

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Multiple instruments and methods exist for collecting discrete streamflow measurements in small streams with low flows, defined here as less than 5.7 m3/s (200 ft3/s). Included in the available methods are low‐cost approaches that are infrequently used, in part, because their uncertainty is not well known. In this work, we evaluated the accuracy and suitability of three low‐cost velocity measurement methods (surface float [SF], velocity head rod [VR], and rising body [RB]) and three conventional current meters (acoustic Doppler velocimeter, and mechanical Price type AA and Price Pygmy meters) relative to discharge calculated from stable artificial hydraulic controls. A total of 231 measurements were made by 20 individuals during 88 site visits to 24 sites in eight states. Accuracies were assessed for all methods and precision was evaluated for the low‐cost methods. The median percent error was below 5% for conventional methods, and below 20% for the low‐cost methods. The SF was the most accurate (median absolute percent error 14%) and precise (mean percent precision of 11%) low‐cost method. The RB and VR, respectively, had 15% and 20% median absolute percent error and 29% and 12% mean percent precision. Results suggest that low‐cost methods, when used appropriately, can be used to estimate discharge data under low flow conditions when measurements with conventional methods are not feasible and the associated accuracies meet end‐user measurement objectives.

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Section: Discussionsupporting

confidence: 52%

“…The improved accuracy in Pike et al. (2016) and the improved precision in Fonstad et al. (2005) may come from differences in velocity rod design and application.…”

Section: Discussionmentioning

confidence: 99%

Section: Comparison With Previous Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Select Velocity Measurement Techniques for Estimating Discharge in Small Streams across the United States

King

Hundt

Simonson

et al. 2022

J American Water Resour Assoc

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“…Enfin, plus anecdotique, signalons la perche à pression dynamique améliorée par Drost (1963, Figure 1f) à partir du modèle développé par Wilm et Storey (1944). Cet instrument est peu voire plus du tout utilisé mais il pourrait connaître un regain d'intérêt avec le développement (hors Nouvelle-Zélande) de la version transparente, plus simple d'utilisation et extrêmement peu coûteuse (Fonstad et al, 2005, Pike et al, 2016. Placée face ou courant, la plaque permet de mesurer la hauteur de charge totale, tandis qu'alignée sur le courant, elle permet de mesurer la hauteur de charge hydrostatique ; la différence entre les deux cotes (surélévation) est théoriquement égale à V²/(2g) où V est la vitesse d'approche (et g l'accélération de la gravité).…”

Section: Ii1 Les Jaugeagesunclassified

L'hydrométrie en Nouvelle-Zélande : l'esprit « Number 8 wire »

Coz¹

2018

La Houille Blanche

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L'hydrométrie en Nouvelle-Zélande présente des enjeux, problèmes et solutions évidemment très semblables à ceux qui font le quotidien des hydromètres de tous les pays. Cependant, comme dans bien d'autres domaines, les Kiwis font face à un environnement resté très sauvage avec un esprit positif et pragmatique d'une efficacité remarquable. Les sujets abordés ici recouvrent les procédures de jaugeage, les stations hydrométriques, les courbes de tarage, l'étalonnage des courantomètres, le réseau national d'observation, la sécurité des opérateurs, la normalisation et l'animation technique nationale et internationale.

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Chronic metal contamination shapes the size structure of Gammarus fossarum populations in French headwater rivers

Lalouette,

Degli Esposti,

Colomb

et al. 2024

Ecotoxicology

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Development and testing of a modified transparent velocity-head rod for stream discharge measurements

Cited by 6 publications

References 3 publications

Evaluation of Select Velocity Measurement Techniques for Estimating Discharge in Small Streams across the United States

Evaluation of Select Velocity Measurement Techniques for Estimating Discharge in Small Streams across the United States

L'hydrométrie en Nouvelle-Zélande : l'esprit « Number 8 wire »

Chronic metal contamination shapes the size structure of Gammarus fossarum populations in French headwater rivers

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