Don't forget the HDPE liner material (same as the rubberized roofing material that is made for flat roofs).
Brace it well, even running a few ties over the top of the raceway to hold the "walls" together. Each cubic foot of water weighs 62#.
HDPE is High Density Polyethylene.
I think esshup means EPDM.
Kinda easy to get all these acronyms mixed up.
