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 Rainfall Collection Calculator


 

How can I figure out how many gallons of water comes off my roof in a rainfall ?

The easy way:  calculator

  • Calculates how much rainfall is generated during a rain storm per month
  • Includes 30-year average rainfall data for your West Central Wisconsin and Southeastern Minnesota
  • Calculates Water requirements based on different irrigation square footage
Amount of Irrigation  Irrigation Area (Sq Ft):
 
Dimensions of house x feet   (your house is ??? square feet)
Portion of roof emptying into catching device    (enter as decimal, not fraction--half the roof would be .5)
 

Month

Average Rainfall in Inches

Roof Yield in Gallons

Irrigation Demand in Gallons

Supplemental Water Needed

January 1.06 ??? 0 0
February .87 ??? 0 0
March 1.93 ??? 0 0
April 3.05 ??? 0 0
May 3.69 ??? ??? ???
June 4.24 ??? ??? ???
July 4.45 ??? ??? ???
August 4.54 ??? ??? ???
September 3.82 ??? ??? ???
October 2.36 ??? ??? ???
November 2.19 ??? 0 0
December 1.14 ??? 0 0
Total ??? ??? ??? ???

 



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