Screen Length and Diameter - Size Matters. Part Two
Low Flow Groundwater Sampling
Having just re-read my previous blog , and for those with a deeper technical interest, I thought it would be useful to include a graphic direct from Lindsay McMillan’s 2014 paper[i]. This is worth looking through as it helps to explain the origin of the water sample in each of the low flow scenarios presented in the earlier blog.
The complexities of obtaining a representative sample from deep, long screened or open boreholes is not something new, particularly to those involved with identifying sources of contamination in deep observation wells and water supply boreholes.
Here are some insights from 2 papers published in the early 1990’s in the Journal of the Institute of Water and Environmental Management (now the Water and Environment Journal) which draw attention to this issue.