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The Siphonic rainwater drainage system uses the Negative Pressure principle to make the rainwater drainage process more effective, with 4 stages:

*Stage 1: Gravity flow

Picture 1: Gravity flow

When it rains, the flow of rainwater is still small, the water flows through the outlets into the pipes. Water flows through the pipe system entirely through the impact of the roof slope along with gravity. The Siphonic Storm Drainage System in this phase operates as a regular Gravity Storm Drainage System and the flow in this phase is defined as “Gravity Flow”, air takes up most of the space in the pipe .

*Stage 2: Wave flow

Picture 2: Wave flow

As the rainwater flow gradually increases, more water in the trough flows through the outlets into the pipe and forces the air inside the pipe to form continuous ripples inside the pipe wall. The flow inside the pipe still follows the principle “Gravity Flow” switch but there are continuous ripples so it is called “Wave Flow”, the water is slowly filling the tube.

*Stage 3: Air bubble flow

Picture 3: Bubble flow

When the rainwater on the roof increased, the amount of water on the trough was approximately equal to the air barrier of the siphonic funnel. The water flowing through the anti-vortex outlet almost completely filled the tube, but air bubbles still appeared inside the stream. flows, the Siphonic effect begins to activate. The Siphonic system works but has not reached its maximum value.

* Stage 4: Flow fills the tube

Picture 4: Pipe filling flow

The rainwater flow continues to increase, the water in the trough rises above the air barrier of the siphonic funnel. Then water flows through the outlet into the pipe, filling the pipe completely and there are no air bubbles. The Siphonic effect works with maximum efficiency, rainwater is drawn out very quickly and at high speed. This stage is called “Tube Filling Flow”.This process is repeated until the water level on the roof (or trough) drops below the air barrier of the Siphonic funnel. When the water level Gradually lower the air baffle, causing air to flow back into the pipe and breaking the Siphonic Effect, the system returns to stage 3/2/1.

The process repeats in a cycle of 1-2-3-4 and vice versa until all the water on the roof (or trough) drains.

Picture 5: Operation cycle of the Siphonic System

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