Man Hole Alert

As opposed to previous displacement detection, a simpler method would be to detect water as it reaches the bottom of the manhole cover thus also giving a pre-emptive warning. This is done by using a noncontact water level sensor.

Measuring altitude by using sensor fusion and considering results from both the Pressure Sensor and Altimeter resulted in accurate measurements only upto a meter. The resolution is far to less to accurately detect a manhole cover rising by a couple of centimeters.