Water Cannon

You conjure 20 gallons of water which erupts forth from you as a high-velocity jet, forming a line 50 feet long and 1 foot wide. Each creature in the area must make a Dex-terity saving throw. On a failure, a creature takes 2d8 bludgeoning damage and, if the creature fails the saving throw by 5 or more, the creature is knocked prone. On a success, a creature takes half as much damage and isn’t knocked prone.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for each slot level above 2nd