TITLE 35: ENVIRONMENTAL PROTECTION
SUBTITLE F: PUBLIC WATER SUPPLIES
CHAPTER II: ENVIRONMENTAL PROTECTION AGENCY
PART 671 MAXIMUM SETBACK ZONE FOR COMMUNITY WATER SUPPLY WELLS
SECTION 671.APPENDIX A VOLUMETRIC FLOW EQUATION
SUBTITLE F: PUBLIC WATER SUPPLIES
CHAPTER II: ENVIRONMENTAL PROTECTION AGENCY
PART 671 MAXIMUM SETBACK ZONE FOR COMMUNITY WATER SUPPLY WELLS
SECTION 671.APPENDIX A VOLUMETRIC FLOW EQUATION
Section 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 |
|||