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Whatā€™s the Best Metric for Judging Pumps?

By
Tom Walski

Work on the upcoming AWWA Manual on Energy (M83) is wrapping up, and Iā€™ve been working with Eric Dole, National...

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MNFs and DMAs – New Concepts?

By
Tom Walski

Iā€™ve read a lot of papers about water loss reduction. Two concepts that show up frequently are Minimum Nighttime Flow...

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Exactly How Bad Is the Hazen-Williams Head Loss Equation for Water and Wastewater?

By
Tom Walski

First of all, we need to forget about the word ā€œexactlyā€ in the title. When dealing with turbulent flow in...

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The Great Drinking Water Rip-Off

By
Tom Walski

No, Iā€™m not talking about the water that your utility provides to your house through your facet (in addition to...

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2D or not 2Dā€“Choosing the Best Type of Simulation in OpenFlows

By
Julio Issao

We have made significant improvements to OpenFlows. The introduction of the new 2D solver allows for a more comprehensive analysis...

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Grandpa, what was it like in the early days of modeling?

By
Tom Walski

One of my favorite topics is the history of modeling. I talk about it whenever I can find someone who...

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Supervisory Control and Data Acquisition Before There Was SCADA

By
Tom Walski

Pretty much every water and wastewater system these days of any size has a SCADA (Supervisory Control and Data Acquisition)...

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Is Your Pressure Data Any Good?

By
Tom Walski

You get a pressure reading of 62 psi. What does that mean? Is it: 62.0000 psi 62 +/- 5 psi...

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New Water Distribution Model Calibration Handbook Has the Answers

By
Tom Walski

When I started working in water distribution system modeling, building a model, and getting it to run was so difficult...

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How to Conduct Pump Energy Studies

By
Tom Walski

Iā€™ve given quite a few presentations on saving energy in pumping. Recently, Iā€™ve been working with Eric Dole from Garver...

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Avez-vous anticipĆ© les inondationsā€Æ?

By
Rua Suleiman

Co-Authors: Rua Suleiman, and Luƭs Fernandes Dans les zones urbaines, les crues soudaines sont de plus en plus frƩquentes et...

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How Do You Decide Where to Put Isolation Valves? – Conclusion

By
Tom Walski

I didnā€™t get much response to the question I posed in a recent blog about the best placement of isolation...

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