11.   The eroded soil that washes off his farm is transported downstream along with other agricultural runoff.

12.   The freshwater outflow of southern Florida has become so diminished and so full of agricultural runoff that the whole region is plagued by extensive algae blooms.

13.   The measure also ends a federal program aimed at controlling agricultural runoff into waterways.

14.   The main cause of the problem is pollution flowing in from the Mississippi in the form of excess nutrients, particularly nitrogen from agricultural runoff.

15.   The new rules were aimed in particular at problems caused by agricultural runoff, which have often escaped existing pollution controls.

16.   The reason for this abundance is agricultural runoff rich in nitrogen and phosphorus that has turned the Salton Sea into a briny soup oozing with algae and other life.

17.   The planners envision a series of filtering marshes to remove agricultural runoff and other pollutants from reclaimed water before it flows into the natural system.

18.   Their marine habitats are threatened by agricultural runoff, sewage, overfishing, boat traffic and a variety of other human activities.

19.   Then cities upstream of the Salton Sea began adding municipal wastewater to the inflow, and nutrients from agricultural runoff reached critical levels.

20.   There is also the problem of agricultural runoff, which causes water pollution even in normal times.