I don’t know exactly what you have done. This is what you need:
- Control Panel
- Offsets & initial rain
- Rain offset
- Modified rain gauge new tip (mm)
- Rain offset
- Offsets & initial rain
1.- Calculate the new section: divide funnel diameter by 2. Square it (multiplying by itself). Multiply by 3.1415
2.- Divide the old section (original Oregon) by the new section.
3.- The result is what you have to enter on WD.