I stumbled upon an odd (possible) issue while adjusting the Pressure Variation while in the Size Lateral Pipes command. The default variation is 20% but I wanted to change it to 10%. Upon changing it to 10%, the Friction Loss became a negative number (-32.55 PSI). I don't know how it calculates this pressure loss but it seems to be wrong. Am I missing something or doing something wrong? Thank you in advance for any info. Anyway, adjusting the Pressure Variation to 15% corrects the issue and returns the correct friction loss (3.86 PSI). 15% variation should suffice for this project.
Irrigation Project Manager, CLIA
Glasir Design Irrigation Consulting
Glasir Design Irrigation Consulting
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