氵+ 寅 = 演
zisea
拼音:yan3
①根据事理推广发挥:推~。讲~(亦作“演讲”)。~义(以史书及传说的材料为基础,增添一些细节,用章回体写成的小说)。~绎(一种推理方法,由一般原理推出关于特殊情况下的结论)。
②依照程式练习:~练。~示。~算。~武。~习。~兵场。
③不断变化:~变。~化。
④把技艺当众表现出来:表~。~出。~播。~奏。主~。义~。
I can't really see any reason water would be needed in this character from its above meanings.
Chinese Etymology
From water 氵水 and phonetic 寅. Original meaning to flow.
ShuoWen: (說文解字):
長流也一曰水名從水寅聲
If Chinese Etymology is not wrong - and I wouldn't be surprised if it is wrong - then how did it go from meaning water to what it means today?