Two lakes are located on the same river, as shown in Figure 11-6. A is upstream of B. Water flows into A at a rate SA; it evaporates from A at a rate EA and from B at a rate EB. A tributary flows into the river between A and B at a rate SB. Evaporation from the streams can be ignored. A soluble pollutant flows into lake A at a rate P. There are no other sources of the pollutant, it is well mixed in both lakes, and it does not codistill. The lakes have water volume VA and VB, respectively, and are in hydrological steady states. (a) What is the rate of stream flow out of lake A? Into lake B? (b) What is the residence time of water in lake A? In lake B? (c) In the steady state, what concentration of pollutant will be found in each lake if P is given in units of grams per second, the 5’s and E’s are in units of liters per second, and the V’s are in units of liters?

 

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SA P EA EB A SB B Figure II-6 Two lakes, A and B, on a stream. Lake A receives pollution directly, while B receives pollution from the outflow from A. SA P EA EB A SB B Figure II-6 Two lakes, A and B, on a stream. Lake A receives pollution directly, while B receives pollution from the outflow from A.

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To solve this problem we can use the concept of mass balance a Rate of stream flow In a steady state ... View the full answer