| 摘要 |
A flat roof structure having a recess with a surrounding area in which is mounted a drain for evacuating standing water on the flat roof. The drain including a housing extending upwardly and outwardly from the flat roof, a sump extending downwardly and inside the flat roof, a liquid pump for draining the water collected from the flat roof, a discharge line connected to the liquid pump and being located in the sump of the drain. The discharge line passing through one of the four walls of the sump, thus allowing it to extend under the flat roof and inside the building. The drain also including a heating element for keeping the standing water collected in the sump in a substantially liquid state within the drain so as to allow continuous discharging of the collected standing water even in sub-zero weather conditions.
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