Is it possible to drain from the roof into the drainage pipe of the site

Good afternoon, the question is this. Is it possible to let stormwater from the roof into the drainage pipe of the site, thus organizing both flushing and drainage of rainwater?

Ekaterina

Expert Answer

Catherine, good afternoon!

The task of storm sewers is to collect both rain and melt water from the roofs of buildings and the surface of the soil with its subsequent discharge into a collector or filter well. Such an engineering system is especially relevant for areas that are located in regions with significant rainfall, lowlands, as well as areas affected by floods. The drainage of rain and melt water allows you to avoid flooding the foundation, subsidence of tracks, siltation of the territory and other troubles.

This type of sewage system consists of several systems. To collect water, a variety of storm water inlets, trays, storm grates and sand separators are used. In open storm showers, water is discharged through special channels and gutters outside the site. Closed systems require the installation of underground pipelines through which rain and melt runoff enter prefabricated or distribution tanks.

Unlike storm sewers, the drainage system is designed for completely different purposes. Her task is to remove excess moisture from the soil. Thus, it is possible to protect the foundation and basements from flooding and the destructive effects of groundwater, as well as moisture penetrating the ground during rain or snowmelt. The decision on the arrangement of drainage structures is made on the basis of information about the occurrence of groundwater - at a depth of less than 1.5 m, such a structure is a vital necessity. A similar engineering system consists of separate filtering elements called drains, open trenches, drainage pipes and main pipelines. As in the first case, the drainage can be carried out both outside the site and in special containers.

It is allowed to lay the storm and drainage pipeline in one trench - the storm drain line should be located above the drainage system. The practice of collecting rainwater, as well as reclamation water into a single collector or filter well. But the combination of these systems in one strictly prohibited. And that's why. The fact is that rainwater from stormwater can cause the reclamation system to work in the opposite direction. During heavy rain, part of the water through the drainage pipes will saturate the soil and harm the foundation and the site. Even worse, the situation will occur when a mud plug or other congestion occurs, as well as when the pipe freezes at the entrance to the collector well - in this case, flooding of the basement and foundation, or even swamping of the entire area, cannot be avoided.