OSE Inverse Theis Calculator

This application allows one to input 5 of the following 6 parameters to predict the 6th (with the exception of Transmissivity): Transmissivity (select units of gpd/ft or ft²/d); Storage Coefficient; Time (years) since the beginning of pumping; pumping rate (select units of gpm or acre-feet/yr); Distance (select units of feet or miles) from the pumping well; and Drawdown (ft) at the given distance. You cannot solve for Transmissivity because for most sets of parameter values, there is not a unique solution for Transmissivity.

Please select the parameter to be determined and enter the the other parameter values:

Notes:

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If you have problems or detect errors with this program, please contact the webmaster.
Disclaimer: This application uses numerical algorithms to estimate output values. OSE has attempted to ensure that these algorithms and code are error free, but makes no such guarantee. The user should attempt to verify the results. Anyone utilizing the output of this program does so at their own risk.

	Transmissivity		gpd/ft ft²/d
	Storage Coefficient
	Pumping Rate		gpm acre-ft/yr
	Time		years days
	Distance		feet miles
	Drawdown (feet)