Dear Hajara, The most ...

Dear Hajara,

The most important fact is that- where do you want to recharge the ground water? - it's may be in an urban area or in the open ground condition of village and parks.  Anyway, while you can harvest rainwater, then think about the method how to inject the harvested water into the ground, it's important.

First think over it. I will write other things latter

Well wishes, Good bye!

Narayangopal Ghimire

CDG, TU Kathmandu, Nepal