Breaking a dike means that water overflows the top of the dike, gradually taking away the soil built by the dike, and then the dike body becomes thin and soft, which can't stop the upstream water. A broken dike is called a broken dike (this is a natural factor)! There is also a man-made breach of the dike, which protects most interests at the expense of local interests. When the flood comes, the dam will be dug as needed to let the flood enter the scheduled flood storage and detention area!