Answer: The word that has been misspelled is "designe".
Explanation: The correct way of spelling this word is "design". In this excerpt, "design" is used as a transitive verb and it is collocating with three nouns "equipment", "buildings" and "canals". The meaning of the word "design" is to create something according to a plan. In that way, "design" has been misspelled in the excerpt because an "e" has been added at the end of the word.