Water Wall Posted on 27th December 201530th May 2019 by ThePD (The Project Definition) Water Wall is an arrangement of pipes carrying water for absorbing and storing solar energy. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Engineering and tagged energy, renewable energy, solar energy. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.