You may find this publication of interest, although it involves creating wetlands in an urban environment rather than protecting existing wetlands. The purpose of the created wetlands in this work is to reduce nutrients carried in stormwater before the water enters natural waterways.

https://www.researchgate.net/profile/Marianne_Burke/contributions/?ev=prf_act

Here is another paper that discusses the nitrogen processing function of created wetlands in urban environments. It is the same study site as my last comment.

https://www.researchgate.net/profile/Marianne_Burke/contributions/?ev=prf_act

http://kolkatawetlands.org/

is about sewage treatment in the City of Kolkata, India, where the locals have a system of stabilization ponds and the tertiary water is used to grow fish. Urban wetlands have disappeared mainly because of artificial drainage to get land to settle on like mexico city (xochimilco is only remianing wetland there) and to lower the water table (like Miami and the Everglades).

Thanks, Marianne,these publications are very useful. I try to read "Predicting Hydrology in Wetlands Designed for Coastal Stormwater Management" and "Lagoonal stormwater detention ponds as promoters of harmful algal blooms

and eutrophication along the South Carolina coast". Is that your recommendation? Because I find many good publications on your profile.

Thank you , Amartya, your example is very effective.