Hydro geological survey .This will give you drilling depth, soil formation, expected water yield &quality. Environmental Impact Assessments (EIA) - This will give you NEMA permit, WRMA and WRUA.borehole drilling charges range between ksh.6,000 per meter to ksh.6,500 per meter.the price covers drilling, casings and test pumping. kindly state your location and i will let you know the price per meter.