Land runoff Marine pollution

surface runoff farming, urban runoff , runoff construction of roads, buildings, ports, channels, , harbours, can carry soil , particles laden carbon, nitrogen, phosphorus, , minerals. nutrient-rich water can cause fleshy algae , phytoplankton thrive in coastal areas; known algal blooms, have potential create hypoxic conditions using available oxygen. in coast of southwest florida, harmful algal blooms have existed on 100 years. these algal blooms have been cause of species of fish, turtles, dolphins, , shrimp die , cause harmful effects on humans swim in water.

polluted runoff roads , highways can significant source of water pollution in coastal areas. 75% of toxic chemicals flow puget sound carried stormwater runs off paved roads , driveways, rooftops, yards , other developed land. in california, there many rainstorms runoff ocean. these rainstorms occur october march, , these runoff waters contain petroleum, heavy metals, pollutants emissions, etc.

in china, there large coastal population pollutes ocean through land runoff. includes sewage discharge , pollution urbanization , land use. in 2001, more 66,795 mi² of chinese coastal ocean waters rated less class of sea water quality standard of china. of pollution came ag, cu, cd, pb, as, ddt, pcbs, etc, occurred contamination through land runoff.