In alluvium formations that is in valley fill deposits which drilling technique will yield more water in a standard gravel packed / v-wire screen bore Percussion rig or Rotary rig and why?
Please let me know. Also if some material is available for comparison on well yields between Percussion rigs and Rotary rigs please let me know and provide the source details also.

Bhavnesh Sharma
replybhavnesh@rediffmail.com