Question $3$

A$.$ What is the difference between the following terms $(5$ marks$)$:

Evaporation and Evapotranspiration

Hyetograph and Hydrograph

Percolation and Infiltration

B$.$ The surface area of a reservoir is given as $A={100}^{*}{y}^{*}y,$ where $y$ is the depth of water

$(m)$ in the reservoir. In one of the weeks of a month, the water level has dropped from

$11$ to $9$ m $.$ Find average hourly rate of evaporation. Assume seepage loss to be $25\%$ of

the evaporation loss. Apply pan evaporation correction, if needed. $(15$ marks$)$