Custom Area calculation

I use drip emitters. The default settings for zones seems to always be 797 sq ft. I found the custom area calculation in @azdavidr’s spreadsheet.

My results are very small, around 10-60 sq ft. Is this normal? What does the Area affect?

It’s been a while so maybe things have changed, but I believe this part of the document is still accurate.

Thank you. I knew I had seen a reference to what the area was used for, but I couldn’t find it. Didn’t think to look in the spreadsheet discussion.