SelectedWorks - Michael C. Johnson

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Selected Works of Michael C. Johnson

Research Professor

Fluid mechanics, valves, flow meters, energy dissipators, spillways, dams, hydroelectric power, water hammer, computational fluid dynamics, physical hydraulic modeling, water expert, test development, instrumentation, data acquisition.

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About Michael C. Johnson

Fluid mechanics, valves, flow meters, energy dissipators, spillways, dams, hydroelectric power, water hammer, computational fluid dynamics, physical hydraulic modeling, water expert, test development, instrumentation, data acquisition.

Present	Research Professor, Utah State University ‐ Civil and Environmental Engineering
Institution Organization Position Type Position Title Time Period to Options Current Position Affiliate my profile with this Institution

Engineering and Civil and Environmental Engineering

1996	PhD, Utah State University ‐ CEE
Institution Organization Student Type Student Title Degree Time Period to Options Currently enrolled Affiliate my profile with this Institution

Articles (54)

Improving Flow Conditions in Irrigation Splitter Boxes (Joshua R. Hogge, Michael C. Johnson, Bryce K. Wilcox, et al.) Journal of Irrigation and Drainage Engineering (2016)

A study was conducted to identify methods of achieving uniform flow distribution in compact irrigation splitter boxes over a wide range of flows but specifically operating at high flow rates. The hydraulic issues resulting from ...

Analysis of Meter Registry Uncertainty (McKenna L. Sumrak, Michael C. Johnson and Steven L. Barfuss) Journal - American Water Works Association (2016)

This study was conducted to quantify the effects of uncertainty on residential water meter registry testing and to demonstrate how to calculate registry uncertainty. All measurements have random and systematic errors, and understanding those errors ...

Effects of Abrupt Pipe Diameter Changes on Venturi Flow Meters (Zachary B. Sharp, Michael C. Johnson and Steven L. Barfuss) Journal of American Water Works Association (2016)

Although accurate flow measurement is a requirement in many applications, flowmeters are often installed in unfavorable conditions. Any time a flowmeter is installed close to a flow disturbance, such as a pipe fitting or a ...

Comparing Low Flow Accuracy of Mechanical and Electronic Meters (McKenna L. Sumrak, Michael C. Johnson and Steven L. Barfuss) Journal of American Water Works Association (2016)

Previous studies have identified water meter inaccuracy at low flows in mechanical metering technologies; however, little has been done to measure the inaccuracy of electronic metering technologies at low flows. This study confirms previous studies ...

Comparison of Selected Differential Producing, Ultrasonic and Magnetic Flow Meters (Johnny B. Prettyman, Michael C. Johnson and Steven L. Barfuss) Journal of American Water Works Association (2016)

Selecting the best flow meter for a specific application can be challenging because of the many types and designs of flow meters, with each having its own merits and drawbacks. Illustrating these specific benefits and ...

Computer Simulations Using Pattern Specific Loss Coefficients for Cross Junctions (Koorosh Nikfetrat, Michael C. Johnson and Zachary B. Sharp) Journal of Hydraulic Engineering (2015)

Detailed KK-factors measured for a symmetrical nonreducing steel cross junction were published in this journal in 2010. This article describes a variable KK-factor model for cross junctions that can take advantage of the published data ...

Effects of Pipe Wall Offsets on Differential Pressure Meter Accuracy (Jesse M. Pope, Steven L. Barfuss, Michael C. Johnson, et al.) Journal of American Water Works Association (2015)

Accurate flow measurement is essential for the management of any type of fluid system. This research investigated the effect on accuracy that five types of 12-in. differential-pressure flow meters have as a result of being ...

Computational Fluid Dynamics Investigation of Butterfly Valve Performance Factors (Adam Del Toro, Michael C. Johnson and Robert E. Spall) Journal - American Water Works Association (AWWA) (2015)

Experimental and simulated performance factors for a 48-in.-diameter butterfly valve were compared for various valve openings and flow conditions to determine the validity of using computational fluid dynamics (CFD) to predict butterfly valve performance factors ...

Differential Pressure Meter Accuracy (J. M. Pope, Steven L. Barfuss, Michael C. Johnson, et al.) Journal AWWA (2015)

Accurate flow measurement is essential for the management of any type of fluid system. This research investigated the effect on accuracy that five types of 12-in. differential-pressure flow meters have as a result of being ...

Submerged Operation of a Fixed-Cone valve with Baffled Hood (Barry Jacob Prettyman, Michael C. Johnson and Zachary B. Sharp) International Water Power & Dam Construction (2015)

The use of fixed-cone valves (FCV) to dissipate energy has proven to be very effective for medium to high heads. Because of the large area required for energy dissipation through dispersion, a hood or other ...

Low-Head Dam Reverse Roller Remediation Options (Riley J. Olsen, Michael C. Johnson and Steve Barfuss) Journal of Hydraulic Engineering (2014)

Low-Head Dam Reverse Roller Remediation Options (Riley J. Olsen, Michael C. Johnson and Steven L. Barfuss) Journal of Hydraulic Engineering (2014)

The writers examine possible remediation options to mitigate the dangers found at low-head dams, using computational fluid dynamics and physical model tests. The objective was to identify an option that could be relatively simple to ...

Cavitation and Head Loss Characteristics in Non-symmetric Bifurcations (Steven Daniels, Michael C. Johnson and Robert E. Spall) Journal AWWA (2014)

Nonsymmetric bifurcations, commonly used in piping systems to divert flow from one pipe to another, see considerable use in hydroelectric power applications and low-level outlet works at dams. Under normal operation, cavitation at the bifurcation ...

Design Considerations for Stationary Hoods Used with Fixed-Cone Valves (Zachary B. Sharp, Barry Jacob Prettyman and Michael C. Johnson) International Water Power & Dam Construction (2014)

Fixed-cone valves, also known as Howell-Bunger valves, are devices often used to dissipate energy from flow discharged at dams with medium to high heads. If the hood is not precisely placed, a phenomenon known as ...

Meter Testing Methods Matter (Devan J. Shields, Steven L. Barfuss, Michael C. Johnson, et al.) Journal of American Water Works Association (2013)

Even though many water utilities in the United States perform some form of water meter testing, little has been published concerning utility meter accuracy-testing procedures. Although AWWA's Manual M6, Water Meters - Selection, Installation, Testing, ...

Using Numerical Modeling to Correct Flow Rates for Submerged Montana Flumes (Ryan Willeitner, Steve Barfuss and Michael C. Johnson) Journal of Irrigation and Drainage Engineering (2013)

Risk of Entrapment at Low-Head Dams (Riley J. Olsen, Michael C. Johnson and Steven L. Barfuss) Journal of Hydraulic Engineering (2013)

This study examines the dangerous countercurrent that can form at the downstream face of a low-head dam for certain flow conditions, utilizing computational fluid dynamics software and laboratory observations. The objective of this project was ...

Using Numerical Modeling to Correct Flow Rates for Submerged Montana Flumes (Ryan P. Willeitner, Steven L. Barfuss and Michael C. Johnson) Journal of Irrigation and Drainage Engineering (2013)

A Parshall flume is a common device for measuring open-channel flows. Some Parshall flumes, however, have been modified or constructed without a downstream diverging section. A Parshall flume that does not have its divergent section ...

Flow Measurement Accuracies of In-Service Residential Water Meters (Devin M. Stoker, Steven L. Barfuss and Michael C. Johnson) Journal of American Water Works Association (2012)

Water utility managers generally agree that water meters, especially mechanical water meters, experience a degradation of accuracy over time. This degradation is a function of several factors, such as wear, water quality, water velocities, throughput ...

Ultrasonic Flow Measurement for Pipe Installations with Non-Ideal Conditions (Devin M. Stoker, Steven L. Barfuss and Michael C. Johnson) Journal of Irrigation and Drainage Engineering (2012)

In the arid Western United States, water is among the most valuable resources. Typically, to successfully and accurately measure a flow rate using most types of flow meters, it is recommended that a straight section ...

Ultrasonic Flow Measurement for Pipe Installations with Non-Ideal Conditions (Devin Stoker, Steve Barfuss and Michael C. Johnson) Journal of Irrigation and Drainage Engineering (2012)

Montana Flume Flow Corrections Under Submerged Flow (Ryan P. Willeitner, Steven L. Barfuss and Michael C. Johnson) Journal of Irrigation and Drainage Engineering (2012)

A Montana flume is a Parshall flume without a diverging downstream section and is used to measure open channel flow. Under free-flow conditions, the Parshall flume and the Montana flume have the same calibration characteristics, ...

Hazards at Low-Head Dams (Riley J. Olsen and Michael C. Johnson) International Junior Researcher and Engineer Workshop on Hydraulic Structures (2012)

ABSTRACT: Low-head dams are small structures that are built for many purposes, the most common being to impound small amounts of water for various uses. At certain flow conditions, a dangerous countercurrent, known as a ...

Effects of Particulates on Water Meter Accuracy through Expected Life (B. Skyler Buck, Michael C. Johnson and Steven L. Barfuss) Journal of American Water Works Association (2012)

Many factors can influence the accuracy of water meters, including age, throughput, water quality, and the presence of particulates in the metered water. These factors can affect various types of meters quite differently depending on ...

Revenue Recovery Through Meter Replacement (Devan J. Shields, Steven L. Barfuss and Michael C. Johnson) Journal AWWA (2012)

Previous studies have identified water meter inaccuracy at low flow rates as a significant source of nonrevenue flow for water systems; however, a lack of available data makes it difficult to include low-flow accuracy and ...