$($a$)$ A cast iron pipe and $D=15\mathrm{.}3cm$ is carrying $0\mathrm{.}061\frac{m^3}{s}$ of water at $15C.$ Compar the friction loss due to friction using Darcy$-$Weisbach formula and the Hazen$-$Williams formula $(C$ for cast iron $=100$ and $0\mathrm{.}26mm,$ kinematic viscosity $(v)$ for water $=1\mathrm{.}141{10}^{-6}\frac{m^2}{s}$ repres of it wo th thych