Device for siphoning water from a ponding area on a flat roof

A device for removing water from a ponding area on a flat roof having a water run-off system which is no longer effective to drain water from said ponding area comprising:

• a housing defining a priming chamber therein adapted to be mounted within the water run-off system at a vertical level below the vertical level of the ponding area of the flat roof,
• siphon hose means having an inlet end adapted to be mounted in water sucking relation to the ponding area and an opposite end disposed in operative relation with said priming chamber such that negative pressure conditions within said priming chamber are communicated therewith, and
• priming means for (1) communicating run-off water flowing in said run-off system with said priming chamber when said housing is mounted therein as aforesaid so as to establish a predetermined water level condition within said priming chamber and (2) lowering said water level condition within said priming chamber by the displacement of water out of said priming chamber into said run-off system to thereby establish a negative pressure within the priming chamber which is communicated with said siphon hose means causing water from the ponding area to flow past the inlet end through the siphon hose means which flow continues by the siphoning action thus established until the water in said ponding area is substantially removed.