$2)$ The average daily flows for each month at a wastewater treatment plant serving abouown below.

Month Average Daily Flow $($m$3/$d$)$

January $12,567$

February $11,980$

March $13,268$

April $15,788$

May $12,790$

July $10,976$

August $9,567$

September $9,478$

October $9,654$

November $11,260$

December $11,980$

June $11,435$

Estimate the following design parameters. State all assumptions and show equations, units, and methods of calculation

a$)$Estimate the average annual flow rate $($AAF$),$ the average wet weather flow rate $($AWWF$)$ and the average dry weather flow rate $($ADWF$),$

b$)$b$)$ Estimate the average wet weather infiltration and inflow $($I&I$)$ in m$3/$d$.$

c$)$ Assume that the average number of people per household is $2\mathrm{.}3.$ Calculate the per capita flow rates associated with the AAF, AWWF, and ADWF in litres per capita per day $($L$/$c$/$d$).$ What is the per capita wet weather I&I?

d$)$ During the next $10$ years, the number of households and the population serviced by the plant is expected to increase with the addition of $5,250$ new houses due to development. Assume that the use of water saving appliances in the new homes will result in a per capita rate of wastewater generation during dry weather from the new development that is $12\%$ less than from the existing homes. What will be the total ADWF to the treatment plant after the new development is connected?