# Reservoir

Reservoir elements are entry or exit network points where the pressure is known or is a design condition. Similar in concept to known pressure boundaries, reservoirs can have as many pipe connections as desired. The flow direction to a reservoir component can be different for each pipe connection. Flow direction in each branch depends on system pressures and is determined by FluidFlow. Reservoirs can be used to represent tanks or vessels or any point in a network where a fluid leaves or enters. For each branch FluidFlow calculates the flow into or out of this element.