As part of A.5.8. Smart urban drainage system, infrastructure documentation for smart urban drainage system in Zadar was implemented. Rain gardens slow down the penetration of water, their benefits are multiple in protection against floods and climate change. As the existing drainage system shows more and more deficiencies as a result of increasingly intense stormy rain periods, we looked for new effective solutions, and the benefits of rain gardens proved to be multiple. Their drainage systems slow down the penetration of water, and surpluses are "sanitized" by well-chosen plants with an absorbent character.