GEOL 104 Lect21

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Geological Sciences and Geological Engineering
GEOL 104
Michael T.Mc Bride

Groundwater exists in the pore spaces in sediment and rock rarely as bodies of subsurface waterThe effect of cement is to reduce the amount of pore spaceJoints also add to porosityWeathered layers are the most likely to gain porosityFractures add to porosityA well sorted sand is most likely to be just as porous as a well sorted gravelIt is possible to have clays and mud that have 80 porosity because there tends to be an electrostatic charge that keeps them apart also clay tends to absorb water and expads which increases pore spaceName the factors that influence porosity use a pair of sketchespoorly sortedwell sorted6 othersNote that the groundwater table is a surfaceboundary separating the zone of aeration unsaturated from the zone of saturationIn the zone of aeration there may be water but there is also air in the poresWhere plant roots go down and rain perme
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