$($a$)$ Assuming the Ganges River is well mixed immediately at the point of discharge of the sewage stream, what is the DO in mg$/$L immediately downstream of the discharge?$($b$)$ What is the initial oxygen deficit in the mixed sewage and river water in mg$/$L$?($c$)$ Suppose the following data are collected to estimate the five$-$day BOD in the river and sewage water:Screenshot $2024-03-14$ at $5\mathrm{.}33\mathrm{.}42$PM$.$png$($d$)$ Calculate the ultimate BOD of the mixed river and sewage stream.$($e$)$ Estimate the reaeration constant assuming the mean depth of the river is $1\mathrm{.}5$m and the mean velocity is $0\mathrm{.}1$ m$/$s$.($f$)$ Suppose the deoxygenation constant is $4\mathrm{.}5($kr$)$ d$^-1.$ At what time downstream will the critical point occur?$($g$)$ What would the minimum dissolved oxygen concentration in the Ganges River be in mg$/$L$?($h$)$ Draw the oxygen sag curve for the river.$($i$)$ Will there be negative effects on the aquatic ecosystem?$($j$)$ What effects might there be on human health and recreation? Note that the Ganges is a source of drinking water and water for washing and agriculture, and it also has spiritual and socio$-$economic significance to the surrounding populations.$\backslash$table$[[,\backslash$table$[[$Volume of$],[$Sample $(mL)$

INFO FROM PREVIOUS QUESTION:

Annual flow rate: $12,105$ m$^3/$s

Temp river $24\mathrm{.}6\backslash$deg C

DO upstream of sewage discharge is $4\mathrm{.}6$mg$/$l

sewage flow rate is $460$ m$^3/$s

Temp discharge is $25\backslash$deg C

DO raw seage is completely depleated $($ie$.$ DO $=0)$