$[$NOTE: THIS PROBLEM HAS BEEN SELECTED FOR HANDMARKING IN ADDITION TO MOBIUS GRADING$]$

If the water surface elevation in Reservoir B is $120m,$ what must be the water surface elevation in Reservoir $A$ if a flow of $0\mathrm{.}03\frac{m^3}{s}$ is to occur in the cast$-$iron

pipe? The contraction has a $60$ angle and $T=10C.$ Consider minor losses.

For the system: $L_1=100m$;$D_1=20cm$;$L_2=150m$;$D_2=15cm.$

Please enter the water surface elevation of reservoir A$.$ Remember to consider the influence of minor losses.