Abstract: A method for removing water from a ponding area of a flat roof having a run-off system which is no longer operable to drain water from the ponding area which comprises directing a quantity of the run-off water flow in the run-off system as a result of the commencement of a rain condition or the like into a priming chamber from which run-off water is allowed to discharge into the run-off system at a rate less than the rate of flow of run-off water into the priming chamber and effecting a siphoning action as a result of the diminishing of the flow of run-off water in the run-off system as by the cessation of the rain condition so that the quantity of run-off water flowing into the priming chamber is less than the quantity flowing out thereby lowering the water level within the priming chamber and creating a suction action which is utilized to commence the movement of the water in the ponding area through the siphon device hose which movement continues until all of the water in the ponding area has been sucked u

Abstract: An apparatus for removing water from a ponding area of a flat roof having a run-off system which is no longer operable to drain water from the ponding area which comprises a structure for directing a quantity of the run-off water flowing in the run-off system as a result of the commencement of a rain condition or the like into a priming chamber, a structure for displacing water from the priming chamber back into the run-off system in such a way as to establish a negative pressure condition within the priming chamber, and a structure for communicating the negative pressure condition to an end of a siphon hose at a vertical level below the level of the ponding area, the other inlet end of which is disposed in water sucking relation to the ponding area to thereby prime the siphon hose and commence the flow of water from the ponding area which flow after the cessation of the rain condition or the like continues until the water is substantially removed from the ponding area.