Three Point Curve - Manual description inconsistent with code

[AbelHeinsbroek]

Hi All,

The manual for Three-Point Pump Curves is inconsistent with the actual implementation in code.

The manual states:

three-point pump curve is defined by three operating points: a Low Flow point (flow and head at low or zero flow condition), a Design Flow point (flow and head at desired operating point), and a Maximum Flow point (flow and head at maximum flow).

However, only curves with x[0] == 0.0 are considered as valid three point curves. Curves with 3 points that start with x[0] > 0.0 are treated as custom curves.

The old UI is also misleading here, presenting a curve equation that is not actually used:

I suggest we change the documentation and remove the 'low' flow condition.

[LRossman]

@AbelHeinsbroek is the manual you refer to the one available on the US EPA EPANET web page ? If so, then changing the document would have to be done by someone at EPA and not us.

P.S. It appears that the Curve Editor dialog you show came from running EPANET under macOS. How was that done?

[AbelHeinsbroek]

Yes, I'll contact USEPA to see if they can change the manual. The one we link to from our toolkit manual (https://epanet22.readthedocs.io/en/latest/index.html) is no longer active.

I use WineSkin to run the classic EPANET viewer on Mac, which works somewhat ok.