Let's say that we have a 3/4" copper line to supply water. We have a volumetric flow of 20 gpm (0.0445 ft^3/s). With this, we have a velocity of 14.35 ft/s. Now, at the end of the copper line, I want to service two homes, so I split the service. Comming out of the 3/4" copper line, I have two 3/4" copper lines more. How do I know how much pressure I'm going to loose for every branch that I add? Let say that later on I want to split the service into three or four 3/4" services, comming out of the same 3/4" "main line". I'm trying to apply Bernoulli's equation, but somehow I don't believe my number because, according to my interpretation of my results, the pressure on the branches is higher that the pressure on the "main" line, this is not possible, is it?