In geography, the word bank generally refers to the land alongside a body of water. Different structures are referred to as banks in different fields of geography, as follows. In limnology (the study of inland waters), a stream bank or river bank is the terrain alongside the bed of a river, creek, or stream. The bank consists of the sides of the channel, between which the flow is confined. Stream banks are of particular interest in fluvial geography, which studies the processes associated with rivers and streams and the deposits and landforms created by them. Bankfull discharge is a discharge great enough to fill the channel and overtop the banks.
At the bank side of rivers, lakes and seas, generally, a scale is marked or a rod is erected on the stone wall of the bank side, a scale is carved on the stone wall to measure the water level, but dueto fluctuation of water waves, water fluctuates up and down on the scale, and the measured numerical value is not accurate enough. The invention aims to design a water level meter which is not easy to fluctuate due to fluctuation of water waves.