Microbial pollution travels only a short distance through?

Microbial pollution predominantly travels through water or moisture in soil, and its movement is significantly influenced by the soil texture and structure. Sandy loam or clay, being denser and finer textured than coarser soils, allows for less permeable conditions where microbial populations may not disperse effectively. In these types of soil, the moisture content can be quite low, especially in dried-out clay, leading to limited movement of microorganisms. Consequently, the population remains relatively localized and does not travel long distances.

In contrast, solution channels in limestone and fissured rock can facilitate the movement of pollutants due to their larger void spaces which can carry both water and suspended matter. This leads to a greater potential for microbial migration over longer distances. Additionally, while dried-out, cracked clay might suggest limited movement, it can sometimes create pathways under certain conditions. Thus, the characteristics of sandy loam or clay present an environment where microbial pollution remains more concentrated and less likely to travel significant distances.