IB Environmental systems and societies Topic 4.2D Water Conservation Revision Notes (SL/HL)

IB Environmental systems and societies Topic 4.2D Water Conservation Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

Water conservation cuts demand at home and in food production, easing scarcity without new supply

Conservation is a demand-side response that reduces how much water people use rather than increasing supply.
Many simple, effective measures can be applied at home to save water, money, and energy.

Supply-side engineering such as dams and desalination is covered separately in 4.2B Water supply.

Domestic conservation saves water, money, and energy while reducing pollution

Domestic water use includes drinking, cooking, bathing, cleaning, and sanitation.
Population growth and urbanisation have raised water demand per household.
Conserving water reduces costs, prevents shortages, and cuts the energy used to treat and transport it.
Using less at home also lowers the pollution load entering sewage systems and ecosystems.

Metering

Definition

Metering

Metering is the installation of devices that record the volume of water used, enabling efficient monitoring and billing.

A water meter measures household use, letting people see how much they consume.
Utilities charge by meter reading, so higher use means a higher bill.
This financial incentive encourages responsible use.
Readings can also detect leaks, since a sudden rise signals hidden losses.

Example

In California, widespread metering has cut household water use as residents became aware of their consumption.

Grey-water recycling

Definition

Greywater recycling

Greywater recycling is the process of collecting, treating, and reusing household wastewater from showers, sinks, and washing machines for non-potable uses like flushing toilets and landscape irrigation.

Greywater is wastewater from sinks, showers, and laundry that can be reused for non-potable purposes.
It can be stored in a greywater tank, filtered, and redirected to flush toilets or irrigate gardens.
Recycling greywater reduces demand on the main supply and lowers wastewater output.

Analogy

Think of grey-water recycling as giving water a second life before it is discarded.

Low-flush toilets

Low-flush toilets use around 4-6 litres per flush, against 9-12 litres for older systems.

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Water conservation cuts demand at home and in food production, easing scarcity without new supply

Conservation is a demand-side response that reduces how much water people use rather than increasing supply.
Many simple, effective measures can be applied at home to save water, money, and energy.

Supply-side engineering such as dams and desalination is covered separately in 4.2B Water supply.

Domestic conservation saves water, money, and energy while reducing pollution

Domestic water use includes drinking, cooking, bathing, cleaning, and sanitation.
Population growth and urbanisation have raised water demand per household.
Conserving water reduces costs, prevents shortages, and cuts the energy used to treat and transport it.
Using less at home also lowers the pollution load entering sewage systems and ecosystems.

Metering

Definition

Metering

Metering is the installation of devices that record the volume of water used, enabling efficient monitoring and billing.

A water meter measures household use, letting people see how much they consume.
Utilities charge by meter reading, so higher use means a higher bill.
This financial incentive encourages responsible use.
Readings can also detect leaks, since a sudden rise signals hidden losses.

Example

In California, widespread metering has cut household water use as residents became aware of their consumption.

Grey-water recycling

Definition

Greywater recycling

Greywater is wastewater from sinks, showers, and laundry that can be reused for non-potable purposes.
It can be stored in a greywater tank, filtered, and redirected to flush toilets or irrigate gardens.
Recycling greywater reduces demand on the main supply and lowers wastewater output.

Analogy

Think of grey-water recycling as giving water a second life before it is discarded.

Low-flush toilets

Low-flush toilets use around 4-6 litres per flush, against 9-12 litres for older systems.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

Topic 1: Foundation 3 subtopics

Topic 2: Ecology5 subtopics

Topic 3: Conservation and biodiversity3 subtopics

Topic 4: Water4 subtopics

Topic 5: Land2 subtopics

Topic 6: Atmosphere and climate change4 subtopics

Topic 7: Natural resources3 subtopics

Topic 8: Human populations and urban systems3 subtopics

HL lenses 3 subtopics

IB Environmental systems and societies 4.2D Water Conservation Notes

Topic 1: Foundation 3 subtopics

Topic 2: Ecology5 subtopics

Topic 3: Conservation and biodiversity3 subtopics

Topic 4: Water4 subtopics

Topic 5: Land2 subtopics

Topic 6: Atmosphere and climate change4 subtopics

Topic 7: Natural resources3 subtopics

Topic 8: Human populations and urban systems3 subtopics

HL lenses 3 subtopics

Water conservation cuts demand at home and in food production, easing scarcity without new supply

Domestic conservation saves water, money, and energy while reducing pollution

Metering

Grey-water recycling

Low-flush toilets

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Water conservation cuts demand at home and in food production, easing scarcity without new supply

Domestic conservation saves water, money, and energy while reducing pollution

Metering

Grey-water recycling

Low-flush toilets

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account