AquaTweaks Mod 1.7.10 is a small, clientside, coremod, which aims to improve the way fluids look around non-solid blocks. In its essence, it renders fake water into ladders, fences, signs and the likes, making them not look as derpy underwater.
Screenshots:
Note that these changes are purely of graphical nature. Fluids will not actually flow through blocks, but simply render into them.
Mod Showcases:
How to install AquaTweaks Mod 1.7.10
Download Links for AquaTweaks Mod 1.7.10
For Minecraft 1.7.10