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Decentralized rainwater management and the avoidance of draining the rainwater to the sewerage system is a perfectly reasonable argument for the improvement of sustainability of urban water systems. Can't see any confusion there.
However, even grammatically corrected to "the possibility of avoiding the connection to sewerage systems" the meaning is unclear, and I would check it against the ST. Also, if it's meant for the US rather than the UK, "sewage" is better than "sewerage."
Yes, the use of "help" here is common and correct; it's just the verb tense that needs to be changed. Also, "harmonizing" needs to be changed to "harmonize", and "the possibility to avoid..." should be "the possibility of avoiding..."