Hi, Please finds attached a spreadsheet that will help with calculating the new Rail fall in mm or assist in recalibrating your rain gage when you increase the collection area.
The Recalibration (and check) formula is on the left of the page and the Recalculation of Rainfall is on the right side. Enter only figures into the boxes in red. The sheet is unprotected to you can see the formulas used if you so desire.
Hope this helps.
Regards
Derek
Stokes Valley Weather.
Raingage.zip (5.31 KB)