Wide mouth scuppers are the best for draining water off a flat roof.
Flat roof drainage scupper.
Debris and small objects will not get stuck.
Typically water is collected by an external leader head catchment that feeds into a downspout installed.
Gutters collect leaves and stop the flow of water.
Scupper drainage systems are characterized by chutes cut out of the parapet walls which extend above roof level.
Flat roofs that are designed to have scuppers as a drainage system are almost maintenance free.
The best is to have a wide scupper 12 or wider so leaves and debris will wash through the scupper instead of clogging it.
15 inch items stylish leaderhead and overflow spouts.
Flat roof drainage system specifications designs troubleshooting problems solutions for interior drains on flat building roofs flat roof drains scuppers and screens questions answers about keeping the flat roof drainage system working or about installing new drains in a flat roof.
Scuppers are a very effective way to channel water off a roof.
Custom products for flat roof drainage.
Maybe i could custom make a roof drain leader for your scupper drain parapet roof needs.
More attention should be given to the location of a drainage system to avoid future problems.
Open end scuppers allow for debris to be washed off the roof unlike a drain or gutter that gets full of debris.