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Butynol ponding, small balcony needs sloping towards drain 2

Balcony not leaking but ponding on the Butynol and needs slope putting back to enable water to flow to drain. Dip of 1-3 cm. Butynol has wooden custom made walkway on top of it which is rotting due to ponding water so am trying to protect it. Deck is total of 3x10 m approx, but only around a third of that is ponding.