porosity is the volume of water that fits between the particles in sediment.
permeability is the rate of flow of water through soil
retention is how much water is traped by soil.
these are all related. if porosity is high then permeability is also high the same if one is low. these to qualities are directly related. This was most clear to me when , in the lab me and angle tested the "gravel". we could see the large spaces in between the large pieces and when we poured water in, it went quickly.
retention has a conflicting relationship with porosity and permeability. When the other 2 are hight then retention is low. This was most prominet when when testing the "clay" sentiment. the retention was so high that it took over an for ANY THING TO HAPPEN.
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