I hope servers will be able to adjust the waves or weather in general so that players can play the same map with different water effects. For a siege map where land artillery has the advantage, players might want to calm the waters a bit for the sake of balance, or they might want to create a chaotic thunder storm and laugh at the absurdity of trying to steer and fire under those conditions.
As Rafail Zotov wrote in his memoirs: "Mutual exchanges of fire continued until 6 in the evening, but not one of the enemy’s batteries were knocked out while twelve of our boats were nearly torn to pieces and more than 300 men had fallen out of our line – so the attack ended. No one could have shown more bravery or self-sacrifice, yet success was impossible. After the prior three-day storm and during the fresh breezes of that day, the sea was rolling hefty waves. How could a ship in such motion aim its cannons true and penetrate the loopholes of a coastal battery?" He is describing an Anglo-Russian fleet attempting to crack the siege of Danzig by an amphibious assault in September of 1813.