News 18 Gujarat has a video segment on the topic

Parsi’s foresight, wells became rainwater harvesting tanks

The segment is in Gujarati, but explains the historic nature of the wells in Parsi Mohollas

100 years ago the entire Navsari district had a population of about 5,000 Parsis, every third person in the total population was a Parsi. However, with the passage of time, the number of people belonging to the Parsi community is decreasing. The work done by the Parsi community in Navsari is amazing. Parsis have contributed a lot in making Navsari the center of education of South Gujarat.