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Lecture 10

Lecture 10

3 Pages
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Department
Environmental Science
Course Code
EESA07H3
Professor
Tanzina Mohsin

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Lecture 10: Urban Areas
Facts on Urban Areas
3 billion people (half of worlds population) live in urban areas
Over 1 billion urban dwellers (1/3) lack access to safe drinking water
Over 2 billion (2/3) lack adequate sanitation
In 1950 there were <100 cities with population of over 1 million
By 2025 it is projected that the number of cities with population over 1 million will be...650
Megacities
oSoutheast Asia- developing countries where it is hard to control population growth
Within 25 years, worlds population is expected to exceed 8 billion and by 2050 it is projected to
approach 10 billion or more
Most of these additional people will live in cities and will place an enormous burden on existing
water supplies
A major challenge will be to keep cities healthy and sustainable
In turn, healthy, sustainable cities demand sustainable water supplies for adequate sanitation and
safe drinking water
Important resource management decisions will need to be made, and ground water, the worlds
largest reserve of fresh water is key to resolving this serious resource issue
In developing countries they have scare underground water supplies
oRural areas depend on ground water
Water management and resources, water and megacities
oLink all knowledge with course materials, readings and dvds
Urban Areas: where is all the water?
Groundwater, mostly from shallow private wells, played key role in birth, and early development of
most megacities
Over 1.2 billion people survive on <U$1 per day
Managed responsibly, groundwater can also help to alleviate urban poverty
If want to manage water resource, have to properly price water
Advantages of ground water
oCompared to surface water, groundwater is vast and generally well protected from sources
of contamination
oIt is relatively insensitive to drought and climate change
oGroundwater can also be introduced incrementally to meet growing demand with minimal
upfront
Role of ground water in cities
oStage 1: villages are established, starts to grow and urbanization evolved
people use shallow wells
oStage 2: rapid industrialization and urbanization lead to intensive use
oStage 3: Post-industrial stage and suburbanization: population becomes decentralized
Impact of urbanization on water Quantity
We are dealing with a two way street urban infrastructure impacts groundwater and groundwater
impact urban infrastructure
oHow groundwater affects infrastructure- over pumping causes landslide
Impermeable cover can significantly deplete direct aquifer recharge
Impermeable surface area (ISA) in US currently size of State of Ohio
Pre-urbanization/Post-urbanization
oPrecipitation almost same for both
oSurface run-off wasted a lot in post-urbanization
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Description
Lecture 10: Urban Areas Facts on Urban Areas 3 billion people (half of worlds population) live in urban areas Over 1 billion urban dwellers (13) lack access to safe drinking water Over 2 billion (23) lack adequate sanitation In 1950 there were <100 cities with population of over 1 million By 2025 it is projected that the number of cities with population over 1 million will be...650 Megacities o Southeast Asia- developing countries where it is hard to control population growth Within 25 years, worlds population is expected to exceed 8 billion and by 2050 it is projected to approach 10 billion or more Most of these additional people will live in cities and will place an enormous burden on existing water supplies A major challenge will be to keep cities healthy and sustainable In turn, healthy, sustainable cities demand sustainable water supplies for adequate sanitation and safe drinking water Important resource management decisions will need to be made, and ground water, the worlds largest reserve of fresh water is key to resolving this serious resource issue In developing countries they have scare underground water supplies o Rural areas depend on ground water Water management and resources, water and megacities o Link all knowledge with course materials, readings and dvds Urban Areas: where is all the water? Groundwater, mostly from shallow private wells, played key role in birt
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