Runoff from a parking lot in summer can cause heated runoff.

This picture shows a typical parking lot after a strong summer rainstorm. Parking lots and roads, which are examples of impervious surfaces, where water runs off into local streams instead of soaking into the ground, as in natural environments, act as "fast lanes" for rainfall to make its way into streams. Rain that falls on a parking lot that has been baking in the sun all day during summer gets super heated and then runs off into streams. This heated water can be a shock to the aquatic life in the stream and can, thus, harm the water quality of the stream.