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A diagram illustrates the flow capacity for the Mississippi River in thousands of cubic feet per second, based on the 1956 project design flood. The Ohio river is the 200,000 square-mile eastern drainage of the Mississippi River watershed. Diagram from — Flow Capacity for the Mississippi River

Water: sewage pumping station

Stormwater ditch full during heavy rains. — Stormwater ditch

Cows grazing along a stormwater ditch during heavy rains. — Stormwater ditch with cows

Stormwater trash in parking lot, in Maryland. — Stormwater trash in parking lot

The pipes seen in this photo are called tiling. They help transfer excess water from the fields to the creek. Many areas of Old Woman Creek in the headwaters portion are very shallow streams surrounded by farm fields. This small creek area has a buffer around it and then is surrounded by fields. Ohio. — Tiling in Old Woman Creek

The pipes seen in this photo are called tiling. They help transfer excess water from the fields to the creek. Many areas of Old Woman Creek in the headwaters portion are very shallow streams surrounded by farm fields. This small creek area has a buffer around it and then is surrounded by fields. Ohio. — Tiling in Old Woman Creek

The pipes seen in this photo are called tiling. They help drain excess water from farm fields to the creek. Ohio. — Tiling in Old Woman Creek

Conceptual diagram illustrating current and historical hydrological conditions of the zones in Florida Bay. — Florida Bay hydrological conditions

Conceptual diagram illustrating the historical (left) and current (right) freshwater flows in the south Florida watershed. — South Florida historical vs. current flow regime

Alkaline chemicals are added to mitigate acid mine tailings. When water is added to the alkaline chemicals, the exothermic (heat releasing) reaction burned through the cubitainer. — Exothermic reaction

This doser times the mechanical addition of alkaline chemicals to acidic mine tailings to mitigate the acidity. — The Doser

Acidic mine tailings are being mitigated by the addition of alkaline chemicals (white), entering the stream below the wooden structure. — Acid mine tailing mitigation

Acidic mine tailings upwell here from an underground source and flow downstream overland — Acid mine tailings headwaters

Acidic mine tailings flow downstream. — Acidic mine tailings in stream

Civil Engineering: mosquito ditches

Corrugated culvert pipe

Solar-powered drainage structure station, used to monitor nutrients flowing into drainage stations from surrounding fields. — Controlled drainage structure station

Drainage ditch in a agricultural field near Ruthsburg, Maryland. Ditch is being monitored by a team of scientists to see the amount of nutrients that comes off the fields. — Drainage ditch

Drainage ditch and control structure. The drainage control structure allows scientists to control the amount of drainage that goes into the ditch from the field. — Drainage ditch and control structure

Mosquito ditches and marshes on the inland side of Assateague Island, bordering Sinepuxent Bay. — Ditches in Assateague Island

Watershed management