Guys, I am a noephyte for a fire system design. If my source of water is a tank, should i include the inside hose of 50 gpm or 100 gpm if more than one hose? If my tank is in the roof how to calculate the fire pump capacity compared to if my tank is in the ground. IF i use HMD method, Should I calculate only the HMD and the calculation will cover the whole area of the building? Thanks