A test result with a consistent datum
A driller records a static water level of 18 feet below a marked casing reference after recovery. During a constant-rate test at 24 gallons per minute, the pumping level stabilizes at 30 feet below the same reference for the observed interval. A colleague calls the 30 foot depth the drawdown and divides the total hole depth into the discharge to obtain specific capacity. The owner asks whether the short test guarantees the same flow indefinitely during every dry season. The learner must distinguish the measured depths, their difference and a performance ratio while preserving the actual time and rate conditions. No new statutory withdrawal limit or aquifer model is supplied. Recovery readings and other relevant resource information still need to be considered before making a broader claim.
1. Calculate drawdown and specific capacity.
Read the worked answer
Drawdown is 30-18=12 feet. Specific capacity for the stated interval is 24/12=2 gallons per minute per foot, not discharge divided by the full hole depth.
2. What should be communicated about the result?
Read the worked answer
Report the actual rate, duration, reference point, drawdown and recovery observations. The short test does not alone guarantee an unlimited sustainable supply or establish every seasonal and neighboring-well effect.