Siches or Seiches: How To spell?

The word Siches is misspelled against Seiches, a noun meaning "Local oscillations in level observed in the case of some lakes, as Lake Geneva."

Word contains consecutive vowels 'EI' in between alphabets s & ches is misspelled as 'I' as letter 'E' is phonetically ignored
Wrong Spelling:  s-i-ches 
Correct Spelling:  s-ei-ches 
Find more wrongly spelled words of Seiches to spell it well.