The herbicide atrazine is accidentally spilled into a river, resulting in 80 μg/L atrazine concentration in the water column at the site of the spill. The intake of a local drinking water supply is located 15 km downstream of the site of the accident. The average river flow velocity is 0.5 m/s and the dispersion coefficient is 50 m2/s. Assuming steady-state conditions in the river and that advection is the dominant transport mechanism, approximately how long will it take for the chemical to reach the drinking water intake? Assume that no transformation of atrazine will occur

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Sediment transport

Sediment transport or Soil transport is the movement of solid particles, usually due to the combination of gravitational forces acting on the sediment, and the movement of the liquid at which the sediment enters. Soil erosion occurs in natural systems where the particles are sandstones (sand, rocks), mud, or clay; the liquid is air, water, or ice; and the gravitational force that works to move particles to the landing surface. Sediment transportation or soil migration due to the movement of liquids occurs in rivers, lakes, lakes, oceans, and other bodies of water as a result of currents and waves. Transportation is also caused by glaciers as they flow, and to places on earth under the influence of wind. Soil erosion due to gravity alone is possible in most sloping areas, including hills, scarves, cliffs, and the continental shelf — the continental boundary of the slope.