Irigation or Irrigation: How To spell?
The word Irigation is misspelled against Irrigation, a noun meaning "The act or process of irrigating, or the state of being irrigated; especially, the operation of causing water to flow over lands, for nourishing plants."
Irrigation has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings i & igation which should not be misspelled with single 'R'
Wrong Spelling:  i-r-igation  Correct Spelling:  i-rr-igation 
Find more incorrect spellings of Irrigation to spell right way.