remove the fuel tank and drain the water
A scupper allows water to exit the roof, usually into a gutter drain.
Metered roof drains are installed on flat roof systems. Their primary purpose is to allow a small amount of water to drain through them, and allow for water to pool on a roof top. This pooling allows for the sewage treatment plants not to be overwhelmed by the rain water. The metered roof drains must be spaced 50 feet from the roof edge and 100 feet from another metered roof drain. Each metered roof drain has 4 weirs built into its body. By removing weirs you can control the amount of water that will drain. The more weirs removed the faster the roof will drain. The roof must be engineered to hold the weight of the pooling water. More information can be found on the web sites from the manufacturers of metered roof drains. Zurn, Mifab etc.
You don't, a roof drain is nothing more then a conductor that allows water to enter the storm water piping and then the piping leads to a place of disposal.
Sound like maybe the bladder has burst in the tank and is covering the drain.
it should not be a water in oil tank it is mean engine cracked
To help the rain water drain off easier.
Shut the water supply to it and drain it.
Bottom of the air tank. Used to drain the water in the bottom off the tank
The only way to know for sure if a person has water in the gas tank is to drain the tank. Usually a car will sputter and die if there is water in the tank.
It is probably best to drain and flush the tank.
You need to drain the tank.