When a body of water receives more water than it can hold , a flood occurs.
During heavy rains, the systems often overflow into the nearest water body.
During heavy rains a flood can occur.
What might cause a flood to occur

[a] Building a dam
[b] Heavy rains
[c] Wet weather
[d] erosion
[e] A drought
[f] A hard freeze
[g] streams
[h] massive damage