Separator Sizing Utility

(One hour rainfall event expected once on the average in 25 years)
Click on map for larger image.
square feet
inches per hour
  • Area= Length x Width
  • All areas must be supplied without commas. ex 1000
  • If your are unsure of your average hourly rainfall, consult map above.
  • Kleerwater™ and Modern Welding Company are not liable for
    misrepresented data on map above.
  • This data should be used soley as a guideline for separator sizing.
  • Other known and unknown factors may affect separator sizing. For interior floor drain applications, the international plumbing code may apply and may require a larger separator.