i$)$ Explain briefly what the terms hydrograph and hyetograph represent;

ii$)$ Explain the function of reverse $($back$)$ routing in the context of management

of reservoirs for water abstraction;

iii$)$ In a clear flow chart format, present an algorithm for the method of forward

reservoir routing to calculate the impact of an abstraction on outflow and lake

level hydrographs.

$4$

$3$

$5$

Q