What it is
A material thinning of a protocol's locked liquidity over a day or a week.
Why it matters
Shallow water is dangerous water. A drain can be a benign rotation, or it can be the first sign of users heading for the exit ahead of something. Either way it changes how much size the venue can absorb.
How we read it
Same engine as the tide, inverted: ranked by dollars withdrawn. We pair it with the protocol's category and home chain so you can tell a sector rotation from a single-venue problem.
What it cannot tell you
A drain driven by a falling token price is not the same as users withdrawing. We flag the move; you read the cause.