A water supply scheme transports $10 \mathrm{MLD}$ (Million Litres per Day) water through a $450 \mathrm{~mm}$ diameter pipeline for a distance of $2.5 \mathrm{~km}$. A chlorine dose of $3.50 \mathrm{mg} /$ litre is applied at the starting point of the pipeline to attain a certain level of disinfection at the downstream end. It is decided to increase the flow rate from $10 \mathrm{MLD}$ to 13 MLD in the pipeline. Assume exponent for concentration, $n=0.86 .$ With this increased flow, in order to attain the same level of disinfection, the chlorine dose (in $\mathrm{mg} /$ litre ) to be applied at the starting point should be
(A) 3.95
(B) 4.40
(C) 4.75
(D) 5.55
A water supply scheme transports $10 \mathrm{MLD}$ (Million Litres per Day) water through a $450 \mathrm{~mm}$ diameter pipeline for a distance of $2.5 \mathrm{~km}$. A chlorine dose of $3.50 \mathrm{mg} /$ litre is applied at the starting point of the pipeline to attain a certain level of disinfection at the downstream end. It is decided to increase the flow rate from $10 \mathrm{MLD}$ to 13 MLD in the pipeline. Assume exponent for concentration, $n=0.86 .$ With this increased flow, in order to attain the same level of disinfection, the chlorine dose (in $\mathrm{mg} /$ litre ) to be applied at the starting point should be
(A) 3.95
(B) 4.40
(C) 4.75
(D) 5.55