In the following sentence, four words printed in bold are given. One of these words printed in bold might either be wrongly spelt or inappropriate to the context of the sentence. Find out the word that is inappropriate or wrongly spelt, if any. If the words printed in bold are correctly spelt and appropriate to the context of the sentence then mark 'No error’ as your answer.

Once the resarvor was filled with water from the river, a brainstorming session took place where everyone pondered over what to do with the superfluity of the water.