Question 1199356

I found this link with a solution:

Problem 12.8
The Lower Colorado River consists of a series of four reservoirs as shown in Fig. P12.8. Mass balances can be written for each reservoir and the following set of simultaneous linear algebraic equations results:

https://webstersean.wordpress.com/problems-and-solutions-from-chapters-11-and-12/

I hope it will help.