A disgruntled postal worker dumps a liquid culture of Anthrax into a river 900 m upstream of the intake pipe for the municipal water works: 1011 organisms are introduced into the river which has a cross section of 0.6 m2.
a. If the river velocity is 40 cm/sec and the longitudinal dispersion coefficient is0.1 m2/ sec, what is the maximum concentration expected at the plant.
b. How wide (2 standard deviations) is the cloud of organisms at the time peak concentration occurs at the intake pipe.
c. How does the answer to (a) change if the organisms have a 10 hr- half life in the river.