Everything in Moderation
You locate the large faucet labelled "Municipal Rat Supply". You haven't experienced much of this new modern era, but already you're learning to just roll with the punches and not ask too many questions.
|Turn on the faucet|
You open the valve just a little, and a rat trickles out of it and scurries away. After a few seconds, another one emerges. That seems like a reasonable rate of flow, though what you're basing that estimation on is a mystery.
You should probably go tell Bart you've fixed his lack-of-rat problem.