https://www.yhrtanks.com/products/trough-deck-roof/ Trough Deck Roof is a type of roof that is made up of a series of steel panels that are joined together to form a trough shape. The panels are typically corrugated to increase their strength and rigidity. The trough shape helps to prevent rainwater and other debris from accumulating on the roof and allows it to drain away easily. This type of roof is commonly used for tanks that are located in areas with high levels of rainfall.