User blog:Mr. Bambu/D&D Homebrew: The Strength of a Tsunami

Premise
you ever just look at someone dealing 200 damage in a round and think "...I can do better"? Some people have. Basically this druid summoned up a tsunami to wipe out an enormous fire elemental.

Calc
The page states they calculated the given tsunami to have 30,000,000 gallons in it, or 113562.354 m^3 of water. Density of pure water (this was created so I will assume it is pure) is 1000 kg/m^3.

Mass = 113562354 kg

Speed, according to a quick Google search, is over 800 kmh, or 222.22 m/s.

KE = 0.5m * v^2 = 2.806e12 Joules, Multi-City Block level+. Oof.

Tallies
Tsunami Druid Summons Tsunami: 670.65 Tons of TNT, Multi-City Block level