Representing Pump-Capacity Relations in Groundwater Simulation Models
Article first published online: 1 SEP 2009
Journal compilation © 2009 National Ground Water Association. No claim to original US government works
Volume 48, Issue 1, pages 106–110, January/February 2010
How to Cite
Konikow, L.F. (2010), Representing Pump-Capacity Relations in Groundwater Simulation Models. Ground Water, 48: 106–110. doi: 10.1111/j.1745-6584.2009.00619.x
- Issue published online: 23 DEC 2009
- Article first published online: 1 SEP 2009
- Received May 2009, accepted July 2009.
The yield (or discharge) of constant-speed pumps varies with the total dynamic head (or lift) against which the pump is discharging. The variation in yield over the operating range of the pump may be substantial. In groundwater simulations that are used for management evaluations or other purposes, where predictive accuracy depends on the reliability of future discharge estimates, model reliability may be enhanced by including the effects of head-capacity (or pump-capacity) relations on the discharge from the well. A relatively simple algorithm has been incorporated into the widely used MODFLOW groundwater flow model that allows a model user to specify head-capacity curves. The algorithm causes the model to automatically adjust the pumping rate each time step to account for the effect of drawdown in the cell and changing lift, and will shut the pump off if lift exceeds a critical value. The algorithm is available as part of a new multinode well package (MNW2) for MODFLOW.