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The base of a river in in contact with the top of an aquifer. A truck carrying bags of powdered cyanide is on a bridge crossing the river when a large bump causes one of the bags to fall into the river. The water in the river suddenly becomes polluted by the cyanide with a concentrations of 6.78mg/L. The aquifer has an average linear ground water velocity of 0.256m/day. Laboratory analyses data indicates that longitudinal dispersivity can be found through the equation: =0.86(logLs)2where Ls is the length of the straight line path between two points along the path of transport. Find the longitudinal dispersion 108mdownstream from the bridge. Assume that the cyanide solute has a diffusion coefficient of 3.6105m2/sand the aquifer has a coefficient related to tortuosity ()equal to 0.8. Find the

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coefficient of hydrodynamic dispersion.