Q (pumping rate):
t (elapsed time since the start of pumping):
delta t (time increments):
r (radial distance from pumped well):
S (Storage Coefficient):
**KEEP UNITS CONSISTENT**
A consultant is preparing to conduct a pump test at a local well field. They have results from a pump test conducted two decades earlier, indicating a transmissivity of 1250 m2/d and a storage coefficient of 1.9x10-4. The intention of the upcoming pump test is to double check these estimates. With a pumping rate of 2730 m3/d, what would be the expected drawdown at a monitoring well 122 m away. The test will run for 1 day, and monitoring will occur approximately every 3 hours.
The results should look as follows (with units of m-d):
What would be a common error in this example?
- forgetting to keep units consistent (i.e. all in days, hours or seconds)