Class Notes (923,174)
CA (543,135)
UTSC (33,027)
EESA07H3 (45)
Lecture 9

Lecture 9

4 Pages
140 Views

Department
Environmental Science
Course Code
EESA07H3
Professor
Tanzina Mohsin

This preview shows page 1. Sign up to view the full 4 pages of the document.
Lecture 9: Guest Lecturer: Groundwater
Lakes, rivers etc. Are surface water
Groundwater is out of public sight and out of political mind
oProbably worlds most important resource
Since ancient time, ground water key to human survival hidden treasure
Groundwater important for Aboriginals, marked springs on their maps
Middle East, China, ground water taken from wells were important for birth of modern civilization
Ancient examples of surface water management
Roman dream back in days was moving water around
They knew how much water they had available, knew when and how to move it
Used aqueducts to manage water supplies
Science of groundwater is young dates back to 1856 (150 years) on fountain in Dijon, France
Henry Darcy
Knowledge and understanding of how groundwater stored- in aquifers- dates back to Meizner
Ground and surface water derive from same atmosphere source rain or snow- probably only
similarities
4 major differences between ground and surface water systems
oWater pathways and regional distributions of resource
oVolumes in storage
oFlow velocities including directions, how quickly water moves
oChemical and contaminant behaviour
What is Groundwater?
Part of the water cycle- hydrologic system
Some water moves into aquifer, once it moves into aquifer, goes into groundwater system
Key to sustainable resource management is understanding and quantifying all components of
hydrologic cycle
Infiltration storage discharge
Aquifers
All rocks capable of storing water, only most permeable rocks capable of supplying or transmit
water to well, then we have an aquifer
Rocks which can store water but are poorly permeable called aquitards
Ability of rock to transmit water is called hydraulic conductivity- how easily water moves across
rocks
Percentage of pore space in rocks is porosity
Porosity doesnt mean permeable
Permeability: ability of rocks to transmit water
Permeability
Ease with which fluid can move through soil or rock
Sand- high permeability, clays- low
Porosity is % of pore space, contains water or air
Some sediments e.g. clays have high porosity (~50%) but very low permeability
Porosity and permeability can be primary or secondary
Primary: pore space and permeability due to naturally occurring interstices within rock
Secondary: pore space and permeability due to fracturing and chemical dissolution (fracturing, or
chemically dissolved)
Many rocks rely on secondary processes
Aquifers come in 2 flavours
Unconfined or water table aquifers
www.notesolution.com

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

Leah — University of Toronto

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto
Saarim — University of Michigan

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan
Jenna — University of Wisconsin

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin
Anne — University of California

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
Description
Lecture 9: Guest Lecturer: Groundwater Lakes, rivers etc. Are surface water Groundwater is out of public sight and out of political mind o Probably worlds most important resource Since ancient time, ground water key to human survival hidden treasure Groundwater important for Aboriginals, marked springs on their maps Middle East, China, ground water taken from wells were important for birth of modern civilization Ancient examples of surface water management Roman dream back in days was moving water around They knew how much water they had available, knew when and how to move it Used aqueducts to manage water supplies Science of groundwater is young dates back to 1856 (150 years) on fountain in Dijon, France Henry Darcy Knowledge and understanding of how groundwater stored- in aquifers- dates back to Meizner Ground and surface water derive from same atmosphere source rain or snow- probably only similarities 4 major differences between ground and surface water systems o Water pathways and regional distributions of resource o Volumes in storage o Flow velocities including directions, how quickly water moves o Chemical and contaminant behaviour What is Groundwater? Part of the water cycle- hydrologic system Some water moves into aquifer, once it moves into aquifer, goes into groundwater system Key to sustainable resource management is understanding and quantifying all components of hydrologic cycle Infiltration storage discharge Aquifers All rocks capable of storing water, only most permeable rocks capable of supplying or transmit water to well, then we have an aquifer Rocks which can store water but are poorly permeable called aquitards Ability of rock to transmit water is called hydraulic conductivity- how easily water moves across rocks Percentage of pore space in rocks is porosity Porosity doesnt mean permeable Permeability: ability of rocks to transmit water Permeability Ease with which fluid can move through soil or rock Sand- high permeability, clays- low Porosity is % of pore space, contains water or air Some sediments e.g. clays have high porosity (~50%) but very low permeability Porosity and permeability can be primary or secondary Primary: pore space and permeability due to naturally occurring interstices within rock Secondary: pore space and permeability due to fracturing and chemical dissolution (fracturing, or chemically dissolved) Many rocks rely on secondary processes Aquifers come in 2 flavours Unconfined or water table aquifers www.notesolution.com
More Less
Unlock Document


Only page 1 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


OR

Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit