You're an idiot. My brother is a builder, and must be ultra careful to control sediment flow from his building sites. This is because the reef was dying, studies were done, and it was realised increased sediment runoff from clearing, agriculture, cities etc... was killing the reef. We were much more careful about this kind of thing, but apparently these days that's all greeny bullsh*t, and we're back to carefree shovelling.