With intense focus, you depress the earth and water speeds to fill the space.

Choose a point within 1.5km. The land in up to a 300m radius, as you choose, collapses 5m and fills with rushing water. Each creature caught in the onslaught of rushing water must make a STR saving throw. A creature takes 12d6 WATER damage and 12d6 ICE damage on a failed save, or half as much on a success as they are battered and buffeted about and thrust underwater. Buildings collapse and most objects are inundated by the rushing water. If you maintain concentration on the spell for the entire duration, the newly formed body of water becomes permanent, otherwise, the water drains away and the land gently returns to its form.