Figure 25.9: Lake Valencia, Venezuela, showing vivid green algal blooms, resulting from
continued influx of untreated wastewater from surrounding urban, agricultural, and indus-
trial land uses. This contributes to ongoing eutrophication, contamination, and salinization
of the lake This pollution impacts the lake’s use as a reservoir for the surrounding urban
centers and limits opportunities for tourism and recreational uses as well. ( 10 )
Figure 25.10: Marine debris can adversely impact all sorts of aquatic life. Pictured here is a
marine turtle entangled in a net. ( 31 )
Figure 25.11: Intercepting nonpoint pollution between the source and waterway has been
found to be successful. Pictured here, a bioretention cell, or rain garden, in the U.S, is
designed to treat polluted storm water runoff from an adjacent parking lot. ( 4 )