Elemental Deluge

You open a quick portal into the elemental plane of Water, at a point in the air you can see within range. A torrent of water is released from the rift in a 15-feet wide cylinder, which travels until it hits total cover and the dissipates. Creatures beneath the portal take 1d6 bludgeoning damage and must succeed on a Strength saving throw or fall prone. 

At Higher Levels: When you cast this spell using a spell slot of 2nd level or higher, you can hold the gateway open for longer. The bludgeoning damage increases by 1d6 per slot level above 1st.