The minimum flushing velocity for a drip lateral is $5\frac{m}{s}.$ If the drip laterals are $16mm$ in diameter

a$.$ What is the minimum flow required at the end of drip line to meet the flushing velocity requirement? Show $Q$ in units $m^3*s^{-1}$ and $m^3*h{r}^{-1}.$

$(4$ marks$)$

b$.$ If the drip laterals are spaced $1,5m$ apart and $10$ drip lines are to be flushed simultaneously, what pipe diameter is required for the flushing manifold, to maintain the requirement of $5\frac{m}{s}$ flushing velocity?

$(4$ marks$)$