The net rainfall for a $10-$min constant intensity rainfall event is $4mm,$ and the resulting hydrograph generated at the outlet of a catchment area is given in Table $2$ below. Based on this information, develop $20-$min unit hydrograph. Sketch the resulting $20$min $UH$ and answer the following questions.

a$.$ What is the peak discharge of the $20-mi$

$UH?$

b$.$ What is the time base of the $20-mi$

$UH?$

Table $2.$ Direct Runoff Hydrograph $($discharge versus time$)$ generated by the $10-$min rainfall event

$\backslash$table$[[$Time $(min),0,10,20,30,40,50],[\backslash$table$[[$Discharge$],[(\frac{m^3}{sec})$