Question

mention two reasons why tanks are excaveted​

Answer 1

Two favourable conditions required

for the construction of tanks are:

• The presence of rocky surface as hard rocks prevents the seepage of water deep into the Earth.
• Adequate rainfall is required as tanks could be refilled as and when required.

Answer 2

Answer:

Excavated tanks (farm dams) provide effective water storage wherever surface water run-off can be harvested for livestock, crop spraying, irrigation and domestic use on rural properties.