Do we give a global sense to the way we design rainwater drainage systems?. Or do we solve partial links without any sense of wholeness?.
I greatly fear that it is the latter. In an environment increasingly sensitised to the concepts of sustainability, efficiency and climate change we cannot keep ignoring the new way in which roofs should be drained. Because as my mother told me, "Son, things manhole done are better."
And for that, this time I want to state what we believe are the five key issues that we need to know in this field, which by the way, affect not only to new developments but all existing buildings:
1 -. Roof drainage systems must take into account the worst storm event that the building may face in its life. Designing for less is to risking to potential overflow and collapse.
2 -. The historical series of rainfall intensity are a less and less reliable indicator of the intensities of rain we are currently experiencing. There is an increase in intensity and frequency of heavy rain events.
3 -. Designing for higher intensity DOES NOT mean necessarily larger diameter pipe and even less on a siphonic system. Doubling manifolds running on parallel or as "primary-secondary" mean a greater flow drainage capacity and a reduction in excitation time of the system, that is, a shorter reaction time the immediate drainage need produced by the storm phenomena.
4 -. Higher roof drained flow means that we must have sufficient capacity in the buried sewerage network, which unfortunately does not happen often as it collapses easily in the extent to which the construction of buildings and the runoff increase. This seriously affects the discharge capacity of roof drainage systems where a "funnel effect" occurs with disastrous consequences in most cases.
5 -. Then it clearly emerges the need to know what to do with this flow excess at which buildings are exposed more frequently and which we can now easily capture through siphonic systems...
And here's where the so-called Sustainable Urban Drainage Systems (SUDS) come in. These systems, which can be used to infiltrate or to recycle water are very important advantages in terms of economic return, reduced flooding, reduced diffuse pollution, curbed denaturation, aquifer recovery, etc.
In conclusion, secondary or emergency siphon systems that give extra protection to the new buildings, particularly (for its higher proportion of the whole), to existing ones, need a downstream drainage capacity that SUDS solutions already provide great advantages. And these in turn need the siphonic systems to feed them and give them meaning. We have reflected this interaction in the following graph:
From Sifonika we are at your disposal to promote this new way of designing that is more in line with the real needs and DOES NOT imply higher costs if we can reuse or infiltrate water.
I wonder if w will keep waiting for the price of water to rise to the level of other European countries to see how this integral solution is increasingly necessary.
Let us be more responsible, ecological and innovative: Do you join the cause?.