Cape Town is facing 'Day Zero', when the city's water supply will fail, because below-average rainfall for years has nearly emptied reservoirs. The city's population has grown faster than its water storage capacity, straining existing supplies. To avert disaster, Cape Town is expanding groundwater extraction, accelerating desalination plants, reusing wastewater, fixing leaks, and enforcing water restrictions to reduce daily usage to 50 liters per person. Maintaining social services like schools and hospitals is a challenge with limited water.
By Aditya Sood and Vladimir Smakhtin. Presented at the "Water in the Anthropocene: Challenges for Science and Governance. Indicators, Thresholds and Uncertainties of the Global Water System" conference in Bonn, Germany May 2013.
Florida DEP Indirect Potable & Direct Potable Reuse presentation 10 sep12Terrance (Terry) Keep
This is a good presentation to better understand the rationale of using purified wastewater as a sustainable and saleable source of freshwater. It also describes the Business Case, two Case Studies and the treatment technologies involved.
The City of Big Spring Texas was in severe drought and running out of fresh water. Augmenting freshwater supplies with purified wastewater was the best economical solution. Purifying wastewater to better-than-drinking standards flipped the cost of operating a wastewater plant to a revenue generator, simply by adding more treatment technology. This presentation, from the Florida Water Resources Conference, explains the rationale for selecting UV Oxidation as part of the proven treatment train.
The EPA Catchments Unit held its 2018 annual Catchment Management Network Meeting on 14 November. All our local authorities and many other public bodies are invited to this meeting to talk about how to protect and improve Ireland's waters.
the necessity of large flow calibration systems for water main systems for th...AquaSPE AG
The attached presentation discusses the necessity of large flow calibration systems for water main systems for the determination of leakage losses, and the quantities of processed water that can be saved through the combination of distribution-side minimization of leakage losses and consumer-side conservation -- and why it makes little sense to put costly recycled and/or desalinated water into water mains that continue to leak.
Paulo Mellet's Productive ecological sewage water treatment systems Magnus Wolfe Murray
In tribute to the most inspiring man who i have encountered on planet so far, a wonderful friend and constant source of brilliant ideas and resources. We are so much poorer without his presence now he has passed away, yet so much richer for knowing him, from learning from him. Your work will live on in everything I do. Go well my friend.
Integrating Sustainable Investment and One Health Strategy: Solution Oriented...Global Risk Forum GRFDavos
GRF One Health Summit 2012, Davos: Presentation by Prof. Günter Klein - Professor - International Center for Sustainable Development - Bonn-Rhein-Sieg University of Applied Sciences
By Aditya Sood and Vladimir Smakhtin. Presented at the "Water in the Anthropocene: Challenges for Science and Governance. Indicators, Thresholds and Uncertainties of the Global Water System" conference in Bonn, Germany May 2013.
Florida DEP Indirect Potable & Direct Potable Reuse presentation 10 sep12Terrance (Terry) Keep
This is a good presentation to better understand the rationale of using purified wastewater as a sustainable and saleable source of freshwater. It also describes the Business Case, two Case Studies and the treatment technologies involved.
The City of Big Spring Texas was in severe drought and running out of fresh water. Augmenting freshwater supplies with purified wastewater was the best economical solution. Purifying wastewater to better-than-drinking standards flipped the cost of operating a wastewater plant to a revenue generator, simply by adding more treatment technology. This presentation, from the Florida Water Resources Conference, explains the rationale for selecting UV Oxidation as part of the proven treatment train.
The EPA Catchments Unit held its 2018 annual Catchment Management Network Meeting on 14 November. All our local authorities and many other public bodies are invited to this meeting to talk about how to protect and improve Ireland's waters.
the necessity of large flow calibration systems for water main systems for th...AquaSPE AG
The attached presentation discusses the necessity of large flow calibration systems for water main systems for the determination of leakage losses, and the quantities of processed water that can be saved through the combination of distribution-side minimization of leakage losses and consumer-side conservation -- and why it makes little sense to put costly recycled and/or desalinated water into water mains that continue to leak.
Paulo Mellet's Productive ecological sewage water treatment systems Magnus Wolfe Murray
In tribute to the most inspiring man who i have encountered on planet so far, a wonderful friend and constant source of brilliant ideas and resources. We are so much poorer without his presence now he has passed away, yet so much richer for knowing him, from learning from him. Your work will live on in everything I do. Go well my friend.
Integrating Sustainable Investment and One Health Strategy: Solution Oriented...Global Risk Forum GRFDavos
GRF One Health Summit 2012, Davos: Presentation by Prof. Günter Klein - Professor - International Center for Sustainable Development - Bonn-Rhein-Sieg University of Applied Sciences
Cape Town contends with worst drought in over a century By D.docxhacksoni
Cape Town contends with worst drought in over a century
By Derek Van Dam, CNN Meteorologist
Updated 1:35 PM ET, Thu June 1, 2017
(CNN)The worst drought in a century is forcing the most stringent water restrictions ever implemented
for South Africa's second largest city.
Cape Town has less than 10% of its useable water remaining for its nearly 4 million residents. The city
is implementing Level 4 water restrictions, which ask residents to limit daily usage to 100 liters (26
gallons) per person. The measure is meant to reduce demand and conserve what little water is still
available and means significant sacrifices for residents.
http://www.capetown.gov.za/media-and-news/Water%20resilience%20a%20heightened%20approach%20to%20avoiding%20water%20shortages%20and%20achieving%20long-term%20water%20security
For Cape Town resident Suzanne Buckley, the restrictions mean adapting to a new lifestyle.
"We have buckets in our shower and bathroom sink to save excess water," Buckley said. "The gray
water is then used to flush our toilets."
The restrictions are in effect across the city in an aggressive effort to preserve its remaining drinking
water, but it may not be enough. South Africa ranks as the 30th driest country in the world and is
considered a water-scarce region. A highly variable climate causes uneven distribution of rainfall,
making droughts even more extreme.
Speaking to CNN, Cape Town Executive Mayor Patricia de Lille explained her concerns about the
growing water crisis. "Climate change is a reality and we cannot depend on rainwater alone to fill our
dams but must look at alternative sources like desalination and underground aquifers."
The Western Cape, one of the country's nine provinces and home to Cape Town, experiences its
annual rainy season during the winter months (June-September). Capetonians are likely several weeks
away from any substantial, drought-relieving rainfall. Even then, predictions are dire for this winter as a
potential El Niño develops off the west coast of South America, according to the Climate Prediction
Center. If El Niño does materialize, it would have a negative effect on rainfall across the Western Cape.
Severe water restrictions
The average American uses between 80 and 100 gallons (302-378 liters) of water per day. This
includes flushing toilets, taking showers or baths, brushing teeth, running dishwashers and
watering lawns.
Imagine restricting daily water use to 25 gallons. Some of the most basic tasks involving water that
we take for granted would be eliminated or severely restricted.
For Cape Town resident Kathy Basso, saving water has meant adopting the "if it's yellow let it mellow, if
it's brown flush it down campaign," a simple and effective measure that saves nearly 10 liters of water
per flush, and has been promoted by city officials.
Hotels across the city are closing their pools and asking patrons to be water .
While some regions gain from better water management, much of the world’s population increasingly depend on water moved from one river basin to another. New options are explored to achieve this economically and with reduced socio-environmental damage.
As part of the World in 2030 global open foresight project, this point of view shares some perspective on changes ahead.
With climate change, increasing urbanisation, growing contamination, higher water consumption, more intensive farming and rising industrial use in many economies all having significant and combined impact, as the global population approaches 10 billion, but the net amount of water on the planet stays constant, concerns over water stress have been building. With 70% of water used for agriculture, a quarter of humanity is now facing a looming water crisis. A broadening range of urban areas need multiple innovations to provide water to cities throughout the year.
Although better water management and the decreasing cost of desalination are having impact in some regions, in many others, and especially for fast-growing inland cities, the task of ensuring continued water access is mounting. Simply moving water from one river basin to another is not straightforward. It is fraught with technological, environmental, economic and socio-political challenge. There are however several developments underway to enable more effective long-distance movement of water – some focused on building new infrastructure at scale and others looking to imaginatively repurpose existing assets to help meet the inevitable future demand.
Share your views @futureagenda
Eilon Adar. Zuckerberg Institute for Water Research. J.B. Institutes for Desrt Research. Ben Gurion University of the Negev. Foro "Promoviendo una Minería Sostenible"
Water / Wastewater - how we solve Sydney's water problem | Biocity StudioBiocity Studio
If Sydney’s water supply is consumed our agricultural industry, transport and energy will be badly effected. This presentation looks at how we solve Sydney’s water problem? Do we build a desalination plant or try to scale water on a large scale?
Sydney's Water Sustainability | Biocity StudioBiocity Studio
Sydney is experiencing long-term droughts, low rainfall and a high demand for water. What can we do to help solve the water crisis? Water restrictions are only a short-term fix. Other solutions are desalination and recycle water plants, water management, and artificial precipitation.
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
A Strategic Approach: GenAI in EducationPeter Windle
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This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
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9. If all the world’s
water was a bucket
full, only one
tablespoon’s worth
would be drinkable
(potable)
Illustration:TomMorganJones
10.
11. Cape Town
50 litres person / day
“Day Zero”
http://www.capetown.gov.za/
• Day Zero is the word given to the apocalyptically named point when water in the six-dam reservoir
system falls to 13.5% of capacity.
• At this critical level, piped supply will be deemed to have failed and the city will dispatch teams of
engineers to close the valves to about a million homes – 75% of the city.
• In place of piped water, the city will establish 200 water collection points, scattered around the city to
ensure the legally guaranteed minimum of 25 litres per person per day within 200 metres of every
citizen’s home.
13. Water Pressure
• Growing population – and at a faster rate than water supply capacity was
increase
• Increased affluence – more devices that use water installed in homes
• Vineyards around Cape Town growing in area, and requiring large
amounts of water
• Ageing infrastructure – leaking pipes
• Drought for several years
• Increased pumping from aquifers
• Slow pace of investment in alternative supplies
Also social pressure to reduce usage…
15. A resilient city?
Cape Town is committed to becoming a resilient city and is part of the 100
Resilient Cities Initiative. It is therefore both prudent and appropriate for the
city to take climate change risks into account in its planning. In line with
international best practice thinking for coastal cities, Cape Town’s resilience
will be increased through the diversification of water supplies away from
dependence on surface water only towards a situation where the city also
obtains a share of its water from ground water, wastewater reuse and
seawater desalination. Consequently, a resilient city will be able to both
optimise and sustain water use through integrated management of four
sources of water – surface water from rainwater (including urban storm water
runoff) managed in dams and wetlands, ground water (with recharge),
reused wastewater and desalinated sea water.
From Cape Town Water Disaster Plan document
16. Cape Town
April 2018
As recently as January, rationing with armed
guards for 4 million people was on the horizon.
Daily ration of just 25 litres per person / day
The most recent situation can be seen on the
City Dashboard
http://coct.co/water-dashboard/
18. How far do 50 litres of water go?
Residents of Cape
Town have been
asked to limit their
use of water to 50
litres a day, which is
less than a third of
the average daily
water use in an EU
member country.
Match the numbers
below to the activity.
159 litres 125 litres 582 litres 177 litres
382 litres 150 litres 45 litres 232 litres
19. The answers
Shower – 45 litres
Bath – 125 litres
Flush – 150 litres
Wash dishes by hand – 159 litres
Dishwasher – 177 litres
Washing machine – 232 litres
Water garden – 382 litres
Wash your car – 582 litres
24. Restaurants
The restaurant is harvesting grey water
from air-conditioning units, boiling ice-
bucket water to mop floors, disconnecting
scullery hoses, installing new tap diffusers,
using disposable napkins, discarding table
cloths.
But the real innovation – which eliminates
the need to wash 5,000 plates a week – is
serving two of his tasting menu courses on
disposable cards that fit into an empty
picture frame; in The Drought Kitchen the
entire six-course menu will be served this
way.
The dishwasher and laundry will need just
10% of the water they used to.
27. Illustration:TomMorganJones
Your job is to assess the relative merits
of a number of possible solutions to the
water crisis.
Use the displayed information (and
your devices) to complete the sections
in your notes)
You will then be given a chance to vote
for your preferred option(s)
28. Futures
Possible – all scenarios which are possible
Probable – which of the possible scenarios
are most likely
Preferable – of the probable futures,
which one would be the most preferable
in terms of sustainability or in maintaining
as close as possible to the current quality
of life for residents
30. Cape Town-South Africa
Water Crisis by
@bridgetti
Cape Town Twitter
Top Tip: Follow the Twitter accounts of organisations connected with topics you are
learning about
36. Acknowledgements 1
S With thanks to Tom Morgan Jones
for illustrations from
Mission:Explore Water (2013) by
Explorer HQ
S Mapping on Water Security by
World Resources Institute:
http://www.wri.org/applications/
maps/
S With thanks to Ben Hennig for
Worldmapper mapping – CC
licensed for use
S With thanks to previous IB
Geographers from Ecolint 2012
who took part in my Water
workshop
Check out the Water Diaries website too
37. Acknowledgements 2
S With thanks to Joanna Payne for a
couple of slides and activities from
a presentation she shared.
S Resource watch:
https://resourcewatch.org/
S CBC has a range of stories in a
series on Cape Town:
http://www.cbc.ca/news/topic/Ta
g/Water%20at%20Risk
S http://www.riverthreat.net/data.h
tml - downloads of data, and
Google Earth files to see threats to
global rivers through human water
usage
Some slides taken from Cape Town Critical Disaster Plan
40. Thefts of supplies
As if the drought is not bad enough‚ the City of
Cape Town is having to battle against thieves
stealing from aquifer drilling sites‚ resulting in
“delays of weeks at a time” to bring more water
online.
The city said in a statement on Sunday it is
something that it can “ill afford”. Tools‚ batteries‚
vehicles and any materials considered possible
scrap are being targeted by thieves.
41. 1: Water for Energy exchange
Turning sea water into potable water takes vast amounts of power. Israel's
desalination plants usually only run overnight to take advantage of lower
electricity costs.
EcoPeace, an environmental NGO made up of Jordanian, Israeli and Palestinian
activists, is floating a new idea to harness the sun-soaked deserts of Jordan, and
sell the solar power to Israel and the Palestinian Authority, who would use it to
run desalination plants.
"By advancing a water-energy exchange we're creating some stability, we're
creating an atmosphere of co-operation," said Gidon Bromberg, the Israeli
director of EcoPeace.
Bromberg said all three governments "have expressed support" for the Water &
Energy Nexus, which is projected to cost $30 billion. Despite the price tag, "not
only is it realistic but it's absolutely essential," given the region's water woes.
Bromberg said the idea could bring wider benefits: "it's certainly stability, it's
certainly security, and those are two essential ingredients for peace."
42. 2. Aquifer drilling
Water is stored in certain types of rocks, and a store of this kind
is called an aquifer.
Boreholes can be drilled to access this water, but this is time
consuming and expensive, and can also result in a lowering of
the water table locally.
Cape Town plan involves:
Prioritise groundwater extraction: Fast-track extraction of water from Cape Flats
Aquifer (CFA) and Table Mountain Group (TMG) Aquifer. Both these
aquifers have significant storage volumes. The water use licences provide for
yields of only a fraction of the available storage, and yields will be maximised
in the short-term within the annual allowable volumes. Groundwater is also
subject to the impact of drought but with significant time delay. The CFA
license requires recharge from treated wastewater to replenish the aquifer and
improve water quality in some instances.
43. 3. Desalination
Water can be extracted from sea water using a process called
reverse-osmosis.
This is very energy intensive, and takes a large plant to do on a
scale which will make a difference to a city the size of Cape
Town.
Cape Town is intending to invest in this technology as it
provides ‘new’ water rather than using other surface and
groundwater sources.
From the Cape Town Disaster Plan:
Decisions around desalination must not be delayed. Desalination
provides the only “new” source of water, and other than technical and
financial constraints, has unlimited augmentation capacity.
45. 5. Punitive bills, but with incentives for low use
Punitive tariffs: Restrictions go hand-in-hand with stepped tariffs, charging
more for water use at higher volumes. Progressively more punitive tariffs
have been introduced on inclining blocks so that higher use of volumes
come at an increased cost.
Level 6 tariff was introduced on 1 February 2018 where punitive tariff
applies to all use over 50lcd. Water is still cheap compared to other goods
and services, and is supplied to every formal household. As households are
now required to dramatically reduce consumption, the volumes in higher
usage steps have shrunk considerably.
46. Wastewater reuse is expected to be less costly compared to desalination
because the capital costs are lower (no expensive marine works are
needed) and energy costs are about half of that needed for desalination –
2 kWh for reuse compared to 3.5-4 kWh for desalination per thousand
litres.
The latest engineering estimates for treating wastewater reuse to a
potable standard in Cape Town is about R7.50 per thousand litres, just
more than half the cost of efficient desalination. Scale is reasonably
important for wastewater reuse too.
Asingle wastewater reuse treatment facility for 50 million litres per day is
about 15% cheaper than a 20 million litres per day facility, and a single
combined facility of 70 million litres per day is strongly preferred for
operational reasons and is cheaper compared to two separate facilities.
6. Reusing waste water
47. Antarctica is relatively close to South Africa.
Feasibility studies have been carried out into the possibility of towing
icebergs to Arabian states previously.
7. Towing icebergs from Antarctica
Synthetic fibre ropes, which are stronger than steel, can be slung around icebergs at the waterline,
but when tugging begins the rope can slip off or make the iceberg roll over. Another reason the
towing must be done slowly and carefully is that dragging an iceberg through the ocean can make it
break apart. The industry has come up with nets for capturing unstable icebergs, but they don’t
work in every case. “There are two major problems: one is getting a vessel that’s strong enough to
tow the size of iceberg you need. The second is breakup and melting. It would probably be feasible
to get an iceberg a kilometre or two wide up to the Arabian sea, but you’d lose an awful lot of mass
on the way. It’s quite likely it would fracture before you got there.”
And then there is the cost. A single iceberg-towing vessel can cost around $75,000 a day, and to tow
a massive iceberg might need several ships for months at a time. “It comes down to the question of
what is feasible and what is practical. Is it more practical to take a tanker to Antarctica and capture
some fresh water melting off a glacier?” In Canada, shops already sell bottled water made from
chunks of frozen water that are chipped off icebergs. King has a chunk in his freezer. “It makes for
nice ice,” he said. “It makes a nice crackly sound in a glass of water.”
48. A lot of water is lost from pipes, and not always detected.
Fixing and improving infrastructure would result in less losses, and create
a more efficient system which would continue to provide benefits in the
future.
Finding the leaks would be a lengthy process.
8. Fixing the leaks
49. 9. Taxing the wine industry
A lack of rainfall in the Winelands that dot the Western Cape of South Africa has entered its
third season in a row, resulting in an undersupply of water for irrigation. The shortage is
intensifying pressures on an industry that employs roughly 300,000 people and forms the
backbone of the provincial economy. South Africa produces some of the world’s most
popular wines but it struggles with profitability, on average, the local wine industry returns
about 1% on investment,
Depending on the region, vines generally need between 250 and 600 millimeters (between
10 and 24 inches) of rain annually to survive. Though temperatures and precipitation vary by
region, South Africa’s Winelands have, on the whole, received about half as much rain in the
run-up to the annual harvest, which began in early January.
Dams that supply irrigation water to the vineyards stood, on average, 26% full in mid-January
compared with about 42% full a year ago. The deficit triggers quotas that have cut the
amount of water available at some vineyards by as much as 80%.
“We simply don’t have enough water to keep up with the irrigation requirements,” said
Francois Viljoen, consultation service manager for VinPro, a nonprofit that represents South
Africa’s wine industry. “The water stress is starting to show. The result is smaller berries,
which affect your volumes. And you also have less juice in the berries.”
51. Why is Cape Town facing ‘Day Zero’ and how can it be averted?
• The reservoirs that supply water to the city of Cape Town are nearly empty due in part to below-average rainfall for many years in a
row, but also, and maybe more importantly, because of increased abstraction.
• Since 1995, Cape Town’s population has grown by 79%, while water storage only increased by 15%, straining the region’s existing
reservoirs.
• Day Zero is the word given to the apocalyptically named point when water in the six-dam reservoir system falls to 13.5% of capacity.
• At this critical level, piped supply will be deemed to have failed and the city will dispatch teams of engineers to close the valves to
about a million homes – 75% of the city.
• In place of piped water, the city will establish 200 water collection points, scattered around the city to ensure the legally guaranteed
minimum of 25 litres per person per day within 200 metres of every citizen’s home.
• The government has struggled to keep pace. Plans to make the city more resilient to climate change by diversifying the water
supply with boreholes and desalination plants were not due to kick in until after 2020. But the climate has moved faster, bringing a
drought so severe it would usually be expected only once every 384 years.
• Some people believe Cape Town’s vineyards bear a large share of blame because they are water-intensive yet they have continued
to expand during the drought.
• Many hotels have removed the plugs from rooms so guests must have a shower rather than a bath. Some shopping malls have
turned off the taps and installed hand-sanitiser dispensers.
• Maintaining social programmes will also be a challenge. City officials say hospitals and prisons will run as normal because they have
access to aquifers, but questions remain about 819 schools, half of which do not have boreholes. There would be sanitation risks if
their toilets were unable to flush, but the authorities insist they will remain open.
• The scramble for water is already raising tensions among residents. Freshwater springs now require 24-hour policing as congestion
builds in surrounding streets and there have been sporadic reports of fights break out in the lengthy queues.
• Shame is used to maintain discipline. An online water consumption map allows neighbours to check on each other’s usage. Some
sports clubs have installed buzzers on their showers that embarrass people who linger under the water for more than two minutes
• Even though extreme droughts are difficult to predict, researchers point out that the city council has failed to adapt the local water
supply to the demands of a growing metropolis.
52. What the City is doing:
Restriction Level 6B: Level 6 was enforced from 1 January 2018, and 6B from 1 February 2018.
The target has been reduced to 450MLD. Daily individual consumption must be limited to a
maximum of 50 lcd to be aligned with Level 6 tariffs. 4 million people at 50 litres per day =
200MLD. Approximately 150MLD is consumed by industry, commerce, government etc. This
results in 100MLD less than the daily target of 450MLD. The inability to adhere to restrictions thus
far means that a stretch target of 50 litres is appropriate to ensure that the 450MLD target is
reached
Communication campaigns: Every person in the city needs to realise that this is a crisis. The city
has launched numerous communication campaigns to assist people in reducing their
consumption, such as household leak detection & repair and how to use 50 litres, and continues
to use radio, print and social
media to reach every citizen and mobilise to reduce consumption to 450MLD, aligned with 6B
restrictions.
Pressure reduction: Pressure reduction was initiated more than a decade ago and has been
accelerated to automate zones across the city to optimise the system and reduce demand -
especially the impact of leaks. Pressure zones are being used to force down consumption by
throttling zones to the extent of partial supply if user behaviour in the zone is high in an effort to
meet the daily water budget. Savings of nearly 50MLD have been affected so far.
DWS = Department of Water and Sanitation
MLD = Million litres per day
53. • Household flow regulators: The city has been installing water management devices to
manage debt for many years. The programme has been dramatically ramped up to
households who have not reduced consumption to restrict daily household consumption
and safeguard against the impact of leaks. In many cases this was due to undetected leaks,
but under level 6 restrictions, the city will install these where consumption is higher than
10.5kl/month. A household of 4, each person using 50 lcd results in a monthly
consumption of 6,000 litres per household. The allowance is per day, whether at home,
work or school. Note also that the average household size in Cape Town is 3.2 people.
The water companies would have preferred to manage household consumption through smart
metering – similar to electricity, using pre-paid metering or remote monitoring and control –
due to low cost of water this has not been viable. The city has installed more than 250,000
water management devices over the past decade. Household demand has declined
significantly.
54. Adaptation
The city has engaged with large and small business with possible solutions and is
working to incentivise reduced consumption. Avenues still to be evolved include usage
of private boreholes in the system.
Information to drive behaviour change: Examples include the Star rating tool for
buildings, and making visually available household consumption data to incentivise all
households to stay within usage limits (dark green & green dots).
Editor's Notes
Shower – 45 litres
Bath – 125 litres
Flush – 150 litres
Wash dishes by hand – 159 litres
Dishwasher – 177 litres
Washing machine – 232 litres
Water garden – 382 litres
Wash your car – 582 litres