Anti-flood and subsidence system, and construction process of anti-flood and subsidence system

The present invention relates to an anti-flooding and subsidence system and a process to construct an anti-flood and subsidence system consisting of a water collection and water/waste filter layer, a drainage layer and a water storage layer. These layers are installed in two parallel and adjacent pits: one for collecting water and for water/waste filtration and one for both draining water and storing water. The water/waste collection and filtration layer consists of two concrete sewer modules placed parallel to each other, in between the two concrete sewer modules is a water/garbage filter partition. The drainage layer has at least one module of pea gravel sewer pipes located adjacent to the water collection floor and located in the drainage pit; This pea gravel sewer pipe has a structure that has a drainage capacity of 5000 liters of water/min/m2. The water collection layer will be built in the stratum with the second aquafier. With this construction method, the present invention has completely solved the drainage of water from heavy rain, flood, high tide... while preventing the soil from drying out, eroding and causing subsidence or cleft.