The water is drained via downpipe nozzles or via a sumps downpipes built into it.
Box gutter construction.
Built in box gutters are meant to be part of the architecture.
Typically a box gutter is trapped between two roofs that feed rainwater into it.
The foundation of most box gutters is wood that is then covered with thin sheet metal such as tin copper lead stainless steel or some other metal that will not readily corrode.
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Let me try to make this as simple as i can.
Box gutters are essentially placed between parallel surfaces as in a valley between parallel roofs or at the junction of a roof and a parapet wall.
It may be lined with epdm rubber metal asphalt or roofing felt and may be concealed behind a parapet or the eaves or in a roof valley.
A box gutter internal gutter parallel gutter or trough gutter is a rain gutter on a roof usually rectangular in shape.
Built in gutters are part of the classical orders of design.