Question $1[25$ Marks$]$

Assuming $2\mathrm{.}5$ peaking factor, design a pumping wells station for a daily average flow of sewage equal to $15$ MLD$.$ It is required that sewage is to be pumped against a head of $8\mathrm{.}0$ m and will be conveyed by a rising main to a treatment site located $200$ m away from the sump well. Assume the velocity flow in rising main as $0\mathrm{.}75\frac{m}{s},$ the efficiency of pump as $65\%,$ the motor efficiency as $75\%$ and minimum flow as $30\%$ average flow.

$*$MLD $=$ Million litres per day

$[1]$ Determine maximum sewage flow rate $(\frac{m^3}{s}).$

$[2$ marks$]$

$[2]$ Determine minimum sewage flow rate $(\frac{m^3}{s}).$

$[2$ marks$]$

$[3]$ Determine the diameter of the rising main $($m$).$

$[4$ marks$]$

$[4]$ Design the rising main and sketch the design.

$[3$ marks$]$

$[5]$ If the sump well retains the flow of wastewater for $20$ minutes, solve the followings:

$($i$)$ The maximum volume quantity of sewage in the sump $(m^3).$

$($ii$)$ The maximum volume quantity of sewage in the rising main $(m^3).$

$($iii$)$ The total capacity of the ${\displaystyle \underset{?}{\overset{?}{}}}p(m^3).$

$[6$ marks$]$

$[6]$ Assuming a maximum of $4\mathrm{.}0$ m depth of the sump, and providing $3$ sumps wells such that $2$ wells will always remain in operation when one of the wells is taken under maintenance, design the minimum liquid depth in each well by solving the following questions:

$($i$)$ The surface area of the ${\displaystyle \underset{?}{\overset{?}{}}}p(m^2).$

$($ii$)$ The diameter of each sump $($m$).$

$($iii$)$The volume of liquid in the well $(m^3).$

$($iv$)$The minimum depth of the well $($m$).$

$[8$ marks$]$