Tom Walski, Ph.D., P.E.

Thomas Walski is a senior product manager at Bentley Systems, Inc. He has 40 years of experience in applied hydraulics. He is author of hundreds of journal papers and conference presentations and is the author or co-author of several books. He has won numerous awards for his work such as the best distribution and plant operation paper in the Journal AWWA on three occasions. In addition to developing software, he has served as a distribution system operations manager, engineering manager for a large water company, executive director at a regional sewer system and a university professor.

Pump Configuration Toolbox

November 22, 2021

As a follow-up to my recent general blog on pump energy, I read an article in Pumps & Systems magazine on what the author called “staging” of..

Doin' the Pump Energy Blues

November 15, 2021

Pumping energy is usually one of the largest components of operating costs for most water systems. And it’s not a trivial cost for wastewater..

Deep Emergencies

November 8, 2021

Water and wastewater do a very good job preparing for what I’ll call “routine emergencies”—pipe breaks, short-term power outages, sewer blockages,..

Don’t Let Me Hear You Say “Cavitation is air bubbles”

October 19, 2021

At least for water piping, air bubbles are comprised of nitrogen and oxygen, and other gases, just like air, while cavitation is caused by the..

Which Water Conferences Should You Attend?

October 6, 2021

There is no shortage of conferences serving the water industry. Each of them contributes something to our profession, and attending is usually..

Insignificant Figures

September 23, 2021

I read a lot of reports and serve as a peer reviewer for a number of journals. I am continuously amazed by the number of otherwise smart engineers..

How Many Different Kinds of Water Demands are There?

September 16, 2021

A key input to a water distribution system model is the demand assigned to locations in the system. For most of the history of modeling and most..


September 3, 2021

That’s a lot of acronyms for one title. Hopefully, if you are reading this blog you know that RDII stands for Rainfall Derived Infiltration and..

Pumping Downhill

August 26, 2021

Everyone knows that pumps are used to lift the water up and over hills. So, nobody would want to pump water downhill. Right?

Extending Pump Curves

August 20, 2021

A key input to any model with pumps is some form of pump head curve showing flow vs. pump head. Given the curve, the model can tell the user the..