filtration

cattails are the first filtering plant that come to mind; their length, height and appearance is all wrong though

replenishing

if absorption, then only returns to the water table quicker

seeps

seep into earth, seep into wood, seep into porous concrete, seep into sponge

versatility

it can be absorbed or channeled

staining

the droplets will find their way through the perforations, gather the stain en route and fall through to land on the surface below

observation

education of water through ability to flow down a decline, a collection & drinkability

healthy?

rainwater can be drunk if collected cleanly
let's keep it for dogs