200m3 per hour Water Yield Testing African Drilling your number one choice if you need to pump test your borehole Call 067 687285 #yieldtesting Determining the yield of a well involves a test to see the balance between the maximum amount of water that can be pumped out of the well and the amount of water that recharges back into the well from the surrounding ground water source. #africandrillingnamibia | African Drilling CC