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A river traveling at a velocity of 10 km/day has a dissolved-oxygen content of 5 mg/L and an ultimate CBOD of 25 mg/L at distance x = 0 km. that is, immediately downstream of a waste discharge. The waste has a CBOD decay coefficient, k1 of 0.2 day-1. The stream has a reaeration rate coef-ficient, k2 of 0.4 day-1. and a saturation di:mind-oxygen concentration of 9 mg/L.
(a) What is the initial dissolved-oxygen deficit?
(b) What is the location of the critical point, in time and distance?
(c) What is the dissolved-oxygen deficit at the critical point?
(d) What is the dissolved-oxygen con-centration at the critical point?
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