Bathroom recessed drain so you have a curbless entry into the shower. Whether you shower in a temp chair or transfer to a bench, it's much easier without a curb or rail to step over. If the whole bathroom is treated like a shower floor, with drains, then it's one smooth move instead of 12 million transfers to get to each step.
How do I create a complete Rainwater Collection System? The image below shows a complete rainwater collection system. While some of the components shown are absolutely necessary, not all of the components listed are required. Although, all of these components will help create a harvesting system that is highly functional and nearly maintenance-free.