Absolutely. Flooding can cause anything sitting on the ground, from litter to lawn ornaments to the oil spots in the driveway, to flow back into the river and pollute it. This also includes the nutrients and chemicals people put on their lawn, which can cause algal blooms and eventually anoxic zones when they reach a body of water. In a sense, pollution can also cause flooding: when man-made or natural erosion causes soil build-up in the riverbed, it pushes the water upward and the next heavy rain could see flooding.
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