Hi Mohamed, I think ...

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Hi Mohamed,

I think everyone has given helpful insight. The main reason is the cost and equipment. I don’t see any relevances between your field technical difficulties and decision to strictly use percussion isntead of rotary.

However, I found a referece that might help to enlighten related to advantages and disadvantages of water well drilling method: 

https://www.michigan.gov/documents/deq/deq-wb-dwehs-gwwfwim-section5_183030_7.pdf

Hope this help, thanks.