Quote:
Originally Posted by Jebby
I'm sure that easier ways to do that, such as drains along the edges and one in the middle...?
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Sure, that would help drain water, but wouldn't help in water retention, unless those pipes are really huge, which is not practical since they wouldn't fit the tight space above the concrete slab below.
To chase after LEED points, designers must only let a smaller percentage of water to be discharged into the main storm system immediately after heavy precipitation. The space below those concrete paver slabs act as some sort of storage I think, and with the help of some outlet structure, regulates how much flow enters the storm system over time.