The so-called "water money" is a usury in which gamblers borrow money temporarily from "lenders" to supplement their gambling funds and calculate interest on a daily basis. In most cases, it is an oral loan without a written loan agreement. Interest is in accordance with the so-called "regulations" or oral agreement at that time. "Water discharge" is generally divided into "internal water" and "external water". "Internal water" is lent in the gambling stall, and the interest is generally 5% per day, and it is required to be returned on the same day; "Waishui" is borrowed outside the gambling stalls, and the interest is generally 2%-3% every day. In fact, whether it is "internal water" or "external water", it is calculated by the accumulation of interest according to the unwritten rules in gambling stalls, which is called "rolling interest" and "snowballing". Once the high loan cannot be repaid, the original tens of thousands of yuan will soon "roll" into hundreds of thousands and hundreds of thousands.