$290+(O{H}^{*}2)$ litre$\frac{s}{d}ay$ per person and the pumping system will

operate $15$ hours a day throughout the year. The length $of$ the pipeline $tobe$ used between the settlement and the

water source $is{L}_b=(ON+2)*500[m].$ The purchase price $of$ the pump $is$ given $as{C}_p=7,000+{900}^{*}{N}_p[$$$]$ according $to$

the power $of$ the pump $(N_p).In$ this equation, the unit $of$ the pump power will $be$ taken $askW.$ The power $of$ a pump

$is$ calculated from the equation $N_p={}^{*}{g}^{*}{H}^{*}\frac{V^{}}{{}_p}[W].$ Water density $is=1000k\frac{g}{m^3}.$ The net head $in$ the pipe system

$is$ given $by$ the equation $H={12}^{*}(ON+1)+{0\mathrm{.}0182}^{*}\frac{L_b*V^{}{?}^2}{D_b^5}[m]$ depending $on$ the pipe length $(L_b),$ flow rate $(V^{})D_b\frac{m^3}{s}.$ The following table shows the pipe diameters $tobe$

used, the unit prices $of$ these pipes and the economic life $of$ the pumps $tobe$ used. The unit price $of$ electricity $is4\mathrm{.}37$

$T\frac{L}{k}Wh$ and the annual escalation $is$ expected $tobe48\%$ for the first $5$ years and $25\%$ for the following years. The

current exchange rate $is35T\frac{L}{\text{\$}}.$ The interest rate $of$ the loan found $by$ the municipality that will construct the

transmission line for this project $is$ annual $42\%.$ Accordingly;

$a$

$N=8$