How is climate change affecting rain intensities?
Higher intensities and shorter durations of rain are being registered, which means a growing need for greater protection on the roofs of buildings in order to avoid the overflowing of gutters or excessive overloads that the flat roofs may support. The siphonic system is an ideal way to provide this protection because of its high speed evacuation and does not involve the use of excessive diameters (the largest is 315mm). It is noteworthy the fact that it can be designed to give extra protection to the drainage system installed, either gravity or too.
Can you recycle the water using a siphonic system in the uptake?
Of course. In fact, being able to concentrate the entire flow at one point without having to rely on terrain slopes and the costs of performing civil works makes the siphon the ideal "ally" of any initiative rainwater recycling initiative.
How much money can I save using the siphonic drainage?
The average percentages of savings that are handled within the sector are around 30%. It depends on factors such as the type of land and civil works costs in which the client stops incurring. Additional savings hardly computable but real is also the work planning acceleration and the possibility of a temporary drainage.
For what type of building is the system better suited?
There is not a better or worse type of building. Siphonic systems were installed worldwide in buildings of all types while economic savings are greater when the deck area to drain is bigger.
Is a special roof required?
No, outlets fit any type of finish or waterproofing, no matter if it is a deck roof or a roof with gutters.
How much water is required on the roof to make the system work?
It is required a minimum quantity, and in any case always less than required when a conventional gravity system is used. For low rainfall the system will work by gravity without virtually accumulating water on deck. As the transition occurs at siphon operation a higher water surface will be accumulated on the roof to a maximum calculable and predictable level at the time of maximum performance. It is from this maximum height where you can practice spillways or overflows, always recommended for any evacuation system employed. .
How the system responds to heavy rains or high intensity rains?
It is precisely for this type of rain when the best features of a system are required. The siphon, the result of having been designed for the maximum rainfall, will work at a higher performance when the real intensity approaches the intensity calculated in the design. Therefore it will evacuate flow faster and faster with its peak performance coinciding with the highest rain: pure hydraulic efficiency in a natural way.
How should I maintain the siphonic system?
While collectors do not require any maintenance being a self-cleaning system for high-speed evacuation, is absolutely necessary, as also for the gravitational system, cleaning and checking the status of outlets in the deck at least twice a year coinciding with the seasons of higher rainfall.
Can a siphonic system be modified?
Any modification of the system requires a recalculation thereof by a specialist who has the proper software. Small uncontrolled changes can lead to significant changes in system capacity or make pipes implode by excessive negative pressure.
What requirements must the buried network to which the system evacuates comply with?
On one hand, the draining manhole must have sufficient dimension (one cubic meter is a reasonable minimum in most cases) to laminate any excess flow in addition to be ventilated with a surface at least equal to the section of the discharge pipe. Furthermore, the diameter of the manhole outlet pipe its pending must be sufficient to allow the water to flow without pressure. A fundamental premise of the calculation is that the drainage is performed at atmospheric pressure.
How drainage overspeed can be fixed?
By increasing the diameter of the pipes in the final meters of the buried section is possible to reintroduce air or vent the system so that the speed is reduced to acceptable parameters not exceeding 3 m/s.
Are spillways necessary?
It is always advisable to have them but always taking care that they are placed at such a height that will not interfere with outlets load depth.
What level of noise is produced when operating the system?
It is difficult to reach conclusions that are valid in general but it is commonly accepted that the highest sound is achieved with filling volume of 50% and the noise is then equivalent to that of a gravity system.
Are longitudinal gradients required in gutters or roof valleys?
Not necessary at all. It is assumed flat drain lines being the space of outlets dependent of flows to evacuate and the dimensions of the gutter or the flat deck lip.
How are outlets clogging resolved?
Up to a third of outlets could be stuck without consequences more important than an increase in the water level as the rest of outlets can take the excess flow. However, it is important to remember that proper maintenance reduces the risk of clogging.