We know that 1 hectare =10000 m2So we get2 hectares =2× 10000=20000 m2It is given thatDepth of ground =5cm=0.05mWe know thatVolume of water = area ×  depthBy substituting the valuesVolume of water =20000× 0.05=1000 m3Therefore, the volume of water that falls is 1000 m3.