Identify Drainage Problem on Patio

What happens here

The video begins by showcasing a newly installed paver patio and pool deck, highlighting that its relatively flat surface and absence of traditional surface or strip drains pose a drainage challenge. The presenter points out that water from rain and pool activity (such as cannonballing) would accumulate on the patio. He notes that typical paver joints are filled with sand, which solidifies and prevents water penetration, making traditional paver patios non-permeable.

Goal: Understand the need for a drainage solution on a flat paver patio/pool deck.