Answer:
The type of appeal presented in the passage is logos.
Step-by-step explanation:
Logos is a type of rhetorical appeal that uses logic in order to convince the audience of something. Thus, the speaker or writer walks the audience through his ideas and evidence to the logical conclusion derived from them.
In this case, the writer affirms people must conserve water during a drought. Then, he moves on to say what people can do to save water, finishing with a convincing number: 1,000 gallons a year. What he did is show evidence of how effective the instructions he gave are. Logically, if they are effective, there is no reason to not follow them. Quite the contrary, since the evidence shows effectiveness, the audience will most likely start doing those actions.