A WWTP generates $22\mathrm{.}0$ MGD of effluent and discharges it into a nearby river. The deoxygenation rate constant at $20C$ is $0\mathrm{.}6da{y}^{-1},$ and the reoxygenation rate constant at $20C$ is $0\mathrm{.}8da{y}^{-1}.$ The effluent has a temperature of $20C.$ The river has a flow rate of $12\frac{m^3}{s}$ and temperature of $15C$ in the wintertime. The effluent mixes with the river $($let$\text{'}$s call this the mixing point$).$ After the effluent has mixed with the river, what are the rate constants you should use to calculate the critical deficit?