Who told you that a water well would replenish the pond within 5 days? Is this a guarantee or an estimate? Is this from an existing water well on your land or from an off-site well or from a well to be drilled on your land. What is the current source of water in your pond? Will the pond be damaged if drained and who will make repairs? Do you have water well (s) on your land now that you use for house, cattle or irrigation? If pressure is ruined or the well(s) go dry, do you care? There are likely many more questions to ask and you need to consult a water expert.