the vertical distance between frl and HFL is called as
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LSL is a upstream sill level is kept 50cm to 100cm below LWL. This is generally equal to volume of silt. Free Board :- It is the vertical distance between TBL and HFL. It is clear margin kept as a measure of safety so that wave form should not cross dam.
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Free Board
1: the height between both the waterline and a ship's upper deck or weather deck, or between the water level as well as the upper edge of a small boat's side.
2: the height above the documented high point of a water-related construction (such as a dam).
The vertical space between the dam crest and the highest reservoir water level is known as freeboard. It is apparent that constructing perfectly stable dams at a reasonable cost is a difficult task.
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