Worked Example $5\mathrm{.}1$

The following data was recorded for a river during a storm. The catchment area at the gauging

station is $240k{m}^2.$

Table $5\mathrm{.}1.$ Data for use in Worked Example $5\mathrm{.}1.$

i$)$ Plot the hydrograph and identify the rising limb$,$ the recession limb$,$ the peak and the

inflexion point.

ii$)$ Separate the baseflow using horizontal line method, straight line method, fixed base method and variable base method.

iii$)$ Determine the volume of water in the baseflow for each method.

iv$)$ Determine the volume of water in the quick response runoff for each method.

v$)$ Determine the equivalent depth of water $(mm)$ in $($iii$)$ and $($iv$).$

vi$)$ If the total amount of rainfall during the storm was $20\mathrm{.}97mm,$ determine the runoff

coefficient $($refer to Chapter $1$ if you have forgotten the runoff coefficient$).$