This invention is a method of measuring flow velocity and flow volume/ mass in an array of fluid columns between fluctuating high and low levels of fluid in the column as these are filled and emptied out. The uniqueness is that the measurement technique is equally applicable to constant fluid levels or fluctuating fluid levels which may happen if such a device is onboard a vehicle for measurement of fuel consumption for example. The novelty of the concept lies that it can be used with any types of leveling sensors- contacting or noncontacting types. A working model/prototype based on this invention was designed and tested extensively and the concept was validated in the experiments.
