Question $1(20$ marks$)$

a$.$ Draw a hydrograph and explain its parts? What is the difference between a

hydrograph and a hyetograph? $(5$ marks$)$

b$.$ Two pipes each $300m$ long are available for connecting to a reservoir from

which a flow of $0\mathrm{.}08\frac{m^3}{s}$ is required. If the diameters of the two pipes are $0\mathrm{.}25m$

and $0\mathrm{.}15m$ respectively, determine the ratio of head lost when the pipes are

connected in series to that of when they are connected in parallel. Neglect minor

losses. $(15$ marks$)$