Are there any studies showing how low-flow works in open bedrock wells versus screen wells? It seems the same situation would apply: water will enter from the water producing zones. Would this hold true, or might there be a difference for open bore versus

The real concern here is whether or not you have known fracture flow, meaning a significant source of water coming into the well. In that situation, just to save time, I would locate my pump nearest to that zone. There have been some low-flow purging and sampling studies done in fractured rock urban boreholes, most of this work has been done in unconsolidated materials or granular formations, but, in essence, the way the methodology works it should make no difference. What we are trying to do is achieve steady state pumping conditions and contributions to the well screen, or to the borehole, that will be dictated by fracture flows as opposed to hydraulic conductivity in the hole. So again, if you know there is a specific fracture zone that’s contributing most of the water in the well screen, locate the pump nearest to that. Otherwise, locate the pump within the borehole and purge until indicator parameters stabilize with a steady pumping rate in the well, and it should yield the results you are looking for.