Free surface flow measurement assembly

A flow measurement device for assessing free surface fluid flow, comprising:

• a void container defining a void chamber and including an upper opening configured to receive the free surface fluid flow,
• a measurement container defining a measurement chamber in fluid communication with the void chamber via at least one through opening,
• an exit orifice defined in the measurement container and configured to allow fluid to drain from the measurement chamber at a known outflow rate based on fluid level,
• at least one capacitive sensor configured to measure a level of fluid in the measurement chamber, wherein the capacitive sensor is arranged on a measurement wall that at least partially defines the measurement chamber, wherein the measurement wall includes a coating layer on an inner surface thereof to insulate the capacitive sensor from fluid while allowing capacitive measurement through the coating layer,
• a processor configured to calculate an inflow rate of the free surface fluid flow based on a rate of change in fluid volume derived from the measured fluid level and the known outflow rate through the exit orifice,
• a diverter positioned in the void chamber above the at least one through opening to prevent direct entry of fluid into the at least one through opening and isolate the measurement chamber from splashing or turbulence in the void chamber,
• an outer housing enclosing the void chamber and measurement container,
• a handle pivotally attached to the outer housing and movable between a stowed position and a deployed position to position the device at a predetermined hang angle during use, wherein the predetermined hang angle positions a top surface of the device at an angle between about 9.5 degrees and about 49.5 degrees relative to horizontal, and
• at least one of an inclinometer, gyroscope, or accelerometer configured to detect the hang angle and adjust volume calculations based on device orientation, including roll, pitch or yaw,
• wherein a fluid path is defined through the upper opening, into the void chamber, through the at least one through opening, into the measurement chamber, and through the exit orifice.