Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

14.1 Groundwater

No description
by

Samantha Dieck

on 24 September 2014

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of 14.1 Groundwater

Chapter 14 Section 1
Groundwater

Water in the Ground
Groundwater
- water that enters the ground and is stored there.
Factors that affect the amount of water that seeps into the ground are the types of rock and soil, climate, and geography.
Porosity
The amount of water that soil or rock can hold depends on the amount of space between the grains of the material.
Porosity
is the percent of a material that is pore space.
Porosity
Porosity depends on:
Particle Shape
Round particles will have more pore space (high porosity).
Flat or angular particles will have less pore space (low porosity).
Porosity
Sorting
Porosity is high when particles are all the same size.
When you have large and small particles mixed, the smaller particles (like sand) will fill in the pore spaces.
Permeability
Permeability
is the rate at which water or other liquids pass through the pore spaces of a rock.
Permeability increases with grain size because large-grained materials have larger pore spaces.
Gravel = high permeability
Silt = low permeability
Permeability
Impermeable
- water or liquid cannot pass through.
It is possible to be highly porous, but not permeable.
Pumice
Permeability
Some water that passes through sediment or rock sticks to the particles, forming a film of water.
Capillary water
The Water Table
When rain falls to the ground, the water seeps (infiltrates) into the soil and sediment below the surface.
It will move down until it hits impermeable rock where it builds up and saturates the ground.
The part of the ground where all the pore spaces are filled is called the
zone of saturation
.
The upper boundary of the zone of saturation is called the
water table
.
The Water Table
The area above the water table is called the
zone of aeration
.
Air can enter the region.
3 parts of the zone of aeration:
Capillary fringe (just above the WT)- where water rises due to its attraction to the soil particles.
Capillary action
Above the capillary fringe is an area that is usually drier.
Below the surface, the soil is rich in organic matter that helps hold more water.
Factors that affect the water table:
Amount of rainfall
Amount of time that passes between rains
The season
The slope of the ground surface
Thickness of the soil
Climate
Human activity
Keeps streams flowing.
Maintains swamps and lakes.
Supplies drinking water to wells.
Importance of the Water Table:
http://techalive.mtu.edu/meec/module06/Permeability.htm
Full transcript