A puddle being hit by loads of raindrops which form ripples on the wet floor.

You may create a plane above any ground and make this water layer semi-transparent as demonstrated on the web page.

It is an asphalt ground which is full of puddles. You may extract related PBR maps as decals and combined with your existing ones to create puddles for your models.

The colors of the puddles and ground, and the roughness of the puddles and ground can be changed by the Substance SBSAR file.

They are rain droplets. This texture can be applied to a plane. the droplet will become rain drops on a glass window. It can also be applied to multiple planes to create raining effect.

This texture should be used with the opacity mask because water drops are transparent.