EXAMPLE $1$:

The river reach shown has been divided into $5$ segments based on measured velocities and

depths. An industrial facility is planned just upstream of the $1^{st}$ segment and it is necessary to

estimate effect of ww discharge. A series of dye experiments have been run and each of the

segments was found to behave as an approximate CFSTR$.$ The pollutant is expected to

disappear according to $1$st order reaction. For the data given determine the steady$-$state

pollutant concentration in each segment.

$Q_{\text{r}\text{i}\text{v}\text{e}\text{r}}=5\frac{m^3}{sec}$

$k=0,2da{y}^{-1}$

$C_0=30\frac{g}{m^3}$