Geol 454

hydraulic conductivity

measure the ease of water flow through a porous medium analogous to resistance

hydraulic head

the total mechanical potential energy per weight of water


well with very short screen used to measure hydraulic head and collect water samples


k is the same in all locations


k varies in all locations


k is the same in all directions


k varies with direction

heterogeneity & anisotropy

results in the environment of deposition of a geologic unit and all post-depositional processes which modified the unit

limits to darcy's law

1. measured k is not represented
2. breaks down at extremely high and low flow rates
3. k representative averaged over and area & reynolds number


geologic unit which can store & transmit water to a pumping well


layer of very low permeability material which can store & transmit water slowly from one aquifer to another