Heavy rainfall or violent wave activity can cause
drought
hurricanes
floods
tornadoes

Heavy rainfall or violent wave activity can cause "floods", since if a particular area that is affected by these weather conditions lacks the drainage resources necessary to reduce the water build up then it has nowhere to go.

Assemblies do not have written codes of laws. laws are matters for magistrates and courts, not assemblies. codes of law are things such as civil law, criminal law, and constitutional law. what assemblies have are procedures regarding debating, voting and other business they might carry out.  also note that rome had three assemblies: the assembly of the soldiers, the assembly of the tribes, and the plebeian councils.