The Area Velocity Flow Meter continuously measures both level and velocity to calculate flow volume in an open channel or pipe. The ultrasonic sensor is installed at the bottom of a pipe or channel. Ultrasonic energy is continuously transmitted underwater into the flow stream.
The pH of concrete wash water from construction and building sites is highly caustic (pH 12-14) which makes it extremely damaging to the environment if discharged to the watercourse (River or Sea). The Environment Agency stipulate it is illegal to discharge above an acceptable level of between pH 6-9.