Nah, I'm still too groggy from sleeping too much. Let's just say that there's a volume of water in the tank and a volume of water in the bowl. The water has to remove a volume of liquids and solids, known as the shit load. The volume used for design is, of course, the maximum expected load, known as the shitload, which is based on the older male, who, as we all know, is full of shit.