Water flows over impervious surfaces or steep slopes, but it erodes and takes things with it as it moves. Water is controlled to enter storm drains, which lead to larger bodies of water or lakes, such as Arbor Lake, created for stormwater management. However, not everything always goes as “planned” and when sediment and waste are transported with this runoff into our freshwaters, a phenomenon known as eutrophication occurs. An example of this would be when humans over-fertilize their lawns and when it precipitates the excess water that flows to larger surface waters takes that fertilizer with it. This results in aquatic plants using that fertilizer to grow and using too much oxygen in the water, not leaving enough for other life in the water. In places like the Chesapeake Bay, this is what causes the dead zones. People often don't consider that what they do affects places like this because of the distance, but that the water has to go somewhere, regardless of what watershed it's part of.