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The city of Barcelona is very compact, with considerable waterproofing due to its confinement between the Besòs and Llobregat rivers, to the east and west; and the sea and Collserola, to the north and south, respectively. The climate is very seasonal, with heavy rains in autumn and spring and summers and dry winters. It has an average risk of floods. This waterproofing causes difficulties in managing spillage in the urban area. The unit sanitation network may suffer from heavy rainfall.
Can Cortada was designed as a new urbanization with green areas and interior roads between the avenues of Can Marcet and the Statute of Catalonia in Can Cortada with an Urban System of Sustainable Drainage (SUDS)

The objectives of these actions are:
• Reduce peak flow at precipitation events.
• Promote the infiltration of rainwater into the soil.
• Recharge natural aquifers.
• Limit rainwater to the city's sewage system.
• Extract groundwater for irrigation and cleaning through the water table.

Priority is given to the creation of greenery, reducing the pavement to a minimum. Permeable pavements were chosen to reduce runoff and erosion within greenery boundaries. The paved areas are at a higher level than the vegetated ones, to drive the runoff water to them, stopping it and infiltrating the soil.

Rainwater from the separating building network is also poured into these vegetated areas, which is facilitated by the topography of the land and the distribution of vegetated flower beds and gutters, to be collected by an infiltration tank, although the spillways located in the end basins of each of the networks are connected to the unit sewage network.

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