What are profie of BOD & DO if:

$-$ BOD decomposition rate at $20$oC$,$ Kd$,$ is $0\mathrm{.}7$ d$1.$

$-$ the reaeration rate, Ka$,$ follows the O$$Connor$-$Dobbins formula expressed in below: Ka$=3\mathrm{.}93*$ U$^0\mathrm{.}5/$H$^1\mathrm{.}5$

$-$ BOD decomposition, Kd$,$ and reaeration rate, Ka$,$ follow the temperature dependent equation expressed in below:

Kd$($T$)=$ Kd$(20)*\backslash$theta d$^($T$-20),$ Where $\backslash$theta d$=1\mathrm{.}047$

Ka$($T$)=$ Ka$(20)*\backslash$theta a$^($T$-20),$ Where $\backslash$theta a$=1\mathrm{.}024$

$-$ BOD settling removal rate, Ks$,$ is $0\mathrm{.}1$ d$1,$ from $0$ km point to $30$ km point. No settling occurs from $30$ km to downstream.

$-$ Oxygen saturation concentration, Os$,$ is $9\mathrm{.}595$ mg L$1$ from $0$ km to $60$ km$,$ and $9\mathrm{.}496$ mg L$1$ from $60$ km to downstream.