Water Harvesting Plastic Brick Matrix

Hello Permie friends,

This is my first post here. Been reading the forum for a while and last night I woke up with an idea so thought I would post it here and see what comes of it.

So the idea is in the subject title. To design a hollow brick, maybe made from a hemp plastic. The bricks would all interconnect and create a matrix that would act as a water harvesting system.

Benefits...
1. Bricks would be lightweight and easy to transport.
2. When bricks are holding water they would act as thermal mass
3. Could eliminate the need for additional water tanks for water storage


Other things that have popped into my head for further consideration...

- Biodegradable or non-biodegradable plastic?
- Would bricks serve purpose for building stability or would they need to partner up with other materials for support?
- Suitable only for non-retaining walls?
- Is the water harvesting capability too complicated and would it be better just to fill the bricks and close them off so that they would only serve as thermal mass / structural density?
- Consideration for water contracting and expanding.
- Consideration for water pressures, one way valves?
-Bricks would need to be able to connect with each other and seal off to hold water.
- Would they be cheaper to produce than normal bricks?

I will leave it at that for now until I have done some more research.

Thanks
Jamie