§671.APPENDIX A. Volumetric Flow Equation

For unconfined unconsolidated, or unconfined non-fractured bedrock aquifers the lateral radius of influence can be calculated as follows:

 

r	=	the square root of	Qt
			4524nH

 

            Where

 

r	=	radius of influence (feet)
Q	=	daily flow from the well under normal operational conditions (cubic feet per day)
t	=	time that the well is pumped under normal operational conditions (minutes)
H	=	open interval or length of well screen (feet)
n	=	aquifer porosity (see Figure A-1) unless more site specific information is available

 

Sand	0.21	Sandstone	0.06
Gravel	0.19	Limestones:
Sand & Gravel	0.15	Primary dolomites	0.18
		Secondary dolomites	0.18
Figure A-1