Chapter 9.1 - Chapter 9.1 Groundwater Resources I.a...

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Chapter 9.1 Groundwater Resources I.a. Groundwater is important part of hydrologic cycle and is tied to surface supplies through pores in soil and rock I.a. Largest potential freshwater sources in the hydrologic cycle- larger than all surface lakes and streams combined I.a. Notes: Groundwater is not an independent source of water, for it is tied to surface supplies for recharge I.a. Groundwater Profile and Movement I.a.i. Begins as surplus water--> percolates downward as gravitational water from the zone of capillary water--> moves through zone of aeration (where soil and rock are less than saturated and some pore spaces contain air) I.a.i.1. Porosity : depends on the arrangement, size, shape, and compaction of the individual particles in the rock layer as well as the nature of the cementing elements between them I.a.i.1. Subsurface rocks are either permeable or impermeable I.a.i.1.a. Permeability depends on whether they conduct water readily (higher permeability) or tend to obstruct its flow (lower permeability) I.a.i. Then water reaches the zone of saturation (area where subsurface water accumulates) where pores are completely filled with water I.a.i.1. Aquifer : rock layer that is permeable to groundwater flow adequate for wells and springs I.a.i.2.
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