Yeah, so, it's where all the water and waste from the road end up, but here we use 'ditch' as a verb, and 'to ditch something' is to throw it away'.

是的，所以，这是道路上所有积水和废物的终点，但在这里我们把“ditch”用作动词，而“抛弃某物”就是扔掉的意思。