A water servicr pipe is located at the first floor level of a building and feeds a riser 120`. If friction loss is 20` of head. Flushmeter valves require 15 PSI operating pressure. What is the minimum street pressure that must be available to serve the top floor and plumbing fixtures?

A water servicr pipe is located at the first floor level of a building and feeds a riser 120`. If friction loss is 20` of head. Flushmeter valves require 15 PSI operating pressure. What is the minimum street pressure that must be available to serve the top floor and plumbing fixtures?