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The Indian River Lagoon on the east coast of Florida is suffering from polluted water, algal blooms, seagrass losses, and fish kills. — Conceptual diagram of the key features of and…

An infiltration trench (a.k.a. infiltration galley) is a rock-filled trench with no outlet that receives stormwater runoff. Stormwater runoff passes through some combination of pretreatment measures, such as a swale and detention basin, and into the trench. There, runoff is stored in the void space between the stones and infiltrates through the bottom and into the soil matrix. The primary pollutant removal mechanism of this practice is filtering through the soil. — infiltration trench

Permeable pavers are brick-like materials that are manufactured in a variety of shapes. Pavers fit together like tiles and are set with small gaps between them, creating grooves for water to infiltrate the soil beneath. Permeable pavers reduce stormwater runoff volume and flow rate, and increase groundwater infiltration and recharge. — permeable pavers

Water discharge from a sandstone quarry into Pipe Creek in Sandusky, Ohio. — Quarry Discharge

Water discharge from a sandstone quarry into Pipe Creek in Sandusky, Ohio. — Quarry Discharge

Conceptual diagram illustrating several of the sources of pollution to nearshore waters in the Florida Keys. — Sources of pollution to nearshore waters in the…

Conceptual diagram illustrating the sources, transport, and cycling of inorganic mercury and methylmercury to the marine environment. — Sources, transport, and cycling of inorganic…

Conceptual diagram illustrating a virus tracer study demonstrating that Class V injection wells can cause contamination of surface waters within the environment due to the porous nature of the limestone substrate. — Virus tracer study

Civil Engineering: Flow deflector (J-hook Vane)

A likely combined sewer overflow outlet in Bayonne, NJ. — Sewer outlet

Conceptual diagram illustrating the process in which wastewater is treated by sewage treatment systems versus traditional and advanced septic systems. — Wastewater treatment

Conceptual diagram illustrating the source of inputs in a coastal ecosystem. — Sources of nitrogen/phosphorus deposition

This conceptual diagram depicts the main factors controlling distribution of aquatic grass community types in Chesapeake Bay. The diagram compares high water discharge and loads to low water discharge and loads. — Environmental factors that control aquatic grass…

Depth mean flow

Current meter with flag

Outfall for sewage plant in upper Patuxent River

Light: mercury bulb

Light: mercury vapor bulb

Light: metal halide bulb