$($SHOW THE IMAGE BELOW. there is pipe network diagram$)$

Estimate the flowrate of each water distribution pipe in the following figure. Assume that all nodes are located on the same elevation and the $n$ value of Manning's equation is $0\mathrm{.}013.$ Use the equations given in the followings.

$f=\frac{124\mathrm{.}5n^2}{\sqrt[3]{D}},h=k{Q}^2$

$k=f(\frac{L}{D})\frac{1}{2g}(\frac{4}{D^2}{)}^2,Q=-\frac{{\displaystyle \underset{?}{\overset{?}{}}}h}{2{\displaystyle \underset{?}{\overset{?}{}}}kQ}$