$3\mathrm{.}8.$ A water$-$supply system is being designed to serve a population of $200000$ people, with an average per capita demand of $600\frac{\frac{L}{d}}{?}$ person and a needed fire flow of $467\frac{L}{s}.$ If the water supply is to be drawn from a river, what should be the design capacity of the supply pumps and water$-$treatment plant? For what duration must the fire flow be sustained, and what volume of water must be kept in the service reservoir to accommodate a fire? What should be the design capacity of the distribution pipes?

$3\mathrm{.}13.$ Calculate the volume of storage required for the elevated storage reservoir in the water$-$supply system described in Problem $3\mathrm{.}8.$