sanitation: what's the real problem?
DESCRIPTION
STEPS Water & Sanitation Symposium 2011TRANSCRIPT
Sanitation: What’s the Real Problem?
Duncan Mara, University of Leeds
It can’t be technology!
We have a small range of proven sanitation technologies:• Arborloos
• Single-pit VIP latrines
• eThekwini latrines
• Pour-flush latrines
• Household-level biogas latrines
• Simplified sewerage
• Low-cost combined sewerage
• Community-managed sanitation blocks
An urbanizing world
It can’t be technology!
We have a small range of proven sanitation technologies:• Arborloos
• Single-pit VIP latrines
• eThekwini latrines
• Pour-flush latrines
• Household-level biogas latrines
• Simplified sewerage
• Low-cost combined sewerage
• Community-managed sanitation blocks
Simplified sewerage
Rigorous hydraulic design based on:
• a minimum sewer diameter of 100 mm
• a minimum tractive tension of 1 N/m2
• a minimum value for peak wastewater
flow of 1.5 litres/second
This results in a minimum gradient of 1
in 200, and a 100 mm dia. sewer being
able to serve 234 households of 5 people
with a water consumption of 100 litres/
person day (or 10 people @ 50 lpd).
Simplified sewerage
Rigorous hydraulic design based on:
• a minimum sewer diameter of 100 mm
• a minimum tractive tension of 1 N/m2
• a minimum value for peak wastewater
flow of 1.5 litres/second
This results in a minimum gradient of 1
in 200, and a 100 mm dia. sewer being
able to serve 234 households of 5 people
with a water consumption of 100 litres/
person day (or 10 people @ 50 lpd).
Small flows flow better in small pipes
Simplified sewerage
Rigorous hydraulic design based on:
• a minimum sewer diameter of 100 mm
• a minimum tractive tension of 1 N/m2
• a minimum value for peak wastewater
flow of 1.5 litres/second
This results in a minimum gradient of 1
in 200, and a 100-mm dia. sewer being
able to serve 234 households of 5 people
with a water consumption of 100 litres/
person day (or 10 people @ 50 lpd).
Best option
in
poor areas
Natal,
Northeast
Brazil, 1983
Simplified
sewerage
Simplified sewerage Monthly cost to householder
State of Rio Grande do Norte in northeast
Brazil, January 2008:
Minimum water tariff:
BRL 18.10 (USD 10.00)
35% surcharge for simplified sewerage
BRL 6.34 (USD 3.50)
(1.7% of minimum wage)
Simplified sewerage Monthly cost to householder
State of Rio Grande do Norte in northeast
Brazil, January 2008:
Minimum water tariff:
BRL 18.10 (USD 10.00)
35% surcharge for simplified sewerage
BRL 6.34 (USD 3.50)
(1.7% of minimum wage)
Dublin Statement“The basic right of all human
beings to have access to clean water and sanitation at
an affordable price”
Community-managed sanitation block
in Kibera
Capital cost:USD 8 per person
Community-managed sanitation block
in Kibera
Capital cost:USD 8 per person
Actually it’s awater & sanitation
block
Payment on a per-use basis
GBP 1 = KES 130USD 1 = KES 80
Use toilet: 2pShower: 4p
20 litres water: 2p
Where does the blame now lie?
… the blame for:
• the 1−2 billion without an adequate water supply
• the 3−4 billion without adequate sanitation
• the 1.15 billion open defecators
• the very low %age of wastewater treated
Where does the blame now lie?
… the blame for:
• the 1−2 billion without an adequate water supply
• the 3−4 billion without adequate sanitation
• the 1.15 billion open defecators
• the very low %age of wastewater treated
Where does the blame now lie?
… the blame for:
• the 1−2 billion without an adequate water supply
• the 3−4 billion without adequatesanitation
• the 1.15 billion open defecators
• the very low %age of wastewater treated
Where does the blame now lie?
… the blame for:
• the 1−2 billion without an adequate water supply
• the 3−4 billion without adequatesanitation
• the 1.15 billion open defecators
• the very low %age of wastewater treated
Where does the blame now lie?
… the blame for:
• the 1−2 billion without an adequate water supply
• the 3−4 billion without adequatesanitation
• the 1.15 billion open defecators
• the very low %age of wastewater treated
The blame now rests with …
The blame now rests with …… developing-country gov’ts
The blame now rests with …… developing-country gov’ts• that have chosen not to invest in
water & sanitation for all their citizens and to passively accept the resulting morbidity and mortality
The blame now rests with …… developing-country gov’ts• that have chosen not to invest in
water & sanitation for all their citizens and to passively accept the resulting morbidity and mortality
• and chosen not to treat wastewater and not to prevent the use of untreated wastewater for crop irrigation
Plenty of very fine words, but not much action
However, some countries have done very well
Some countries have done very well
MALAYSIA in 2008Urban: 96% improved and 4% shared sanitation
Rural: 95% improved and 4% shared sanitation and 1% OD
THAILAND in 2008Urban: 96% improved and 4% shared sanitation
Rural: 95% improved and 4% shared sanitation and 1% OD
Some countries have done very well
MALAYSIA in 2008Urban: 96% improved and 4% shared sanitation
Rural: 95% improved and 4% shared sanitation and 1% OD
THAILAND in 2008Urban: 95% improved and 5% shared sanitation
Rural: 96% improved and 4% shared sanitation
Have MALAYSIA and THAILAND (and all the industrialized countries) done so well because they “think clean”?
Quite a few countries don’t seem to think clean …
Have MALAYSIA and THAILAND (and all the industrialized countries) done so well because they “think clean”?
Quite a few countries don’t seem to think clean …
Countries with >20% ODers in 2008
AFRICA: Angola (23%), Benin (60%), Burkina Faso (64%), Cabo Verde (42%), Central African Republic (20%), Chad (65%), Côte d’Ivoire (27%), Eritrea (85%), Ethiopia (60%), Ghana (20%), Guinea (22%), Guinea-Bissau (31%), Lesotho (40%), Liberia (49%), Madagascar (32%), Mauritania (53%), Mozambique (42%), Namibia (53%), Niger (79%), Nigeria (22%), São Tome & Principe (55%), Senegal (19%), Sierra Leone (24%), Somalia (54%), Sudan (41%), Togo (55%), Zimbabwe (25%)
ASIA: Cambodia (64%), India (54%), Indonesia (26%), Laos (38%), Nepal (52%), Pakistan (27%), Timor-Leste (43%), Yemen (25%)
LATIN AMERICA & CARIBBEAN: Bolivia (21%), Haiti (30%)
Devloping world as a whole: 21%
What’s stopping other countries doing as well as Malaysia and Thailand?
Probably several/many reasons − for example:
• Politicians and senior civil servants don’t think that ‘thinking clean’ is that important
−“No solutions without political solutions”
• Technical ignorance of local engineers and planners
• Too much corruption in the water sector
What’s stopping other countries doing as well as Malaysia and Thailand?
Probably several reasons − for example:
• Politicians and senior civil servants don’t think that ‘thinking clean’ is that important
−“No solutions without political solutions”
• Technical ignorance of local engineers and planners
• Too much corruption in the water sector
What’s stopping other countries doing as well as Malaysia and Thailand?
Probably several reasons − for example:
• Politicians and senior civil servants don’t think that ‘thinking clean’ is that important
− “No solutions without political solutions”
• Technical ignorance of local engineers and planners
• Too much corruption in the water sector
What’s stopping other countries doing as well as Malaysia and Thailand?
Probably several reasons − for example:
• Politicians and senior civil servants don’t think that ‘thinking clean’ is that important
− “No solutions without political solutions”
• Technical ignorance of local engineers and planners
• Too much corruption in the water sector
What’s stopping other countries doing as well as Malaysia and Thailand?
Probably several reasons − for example:
• Politicians and senior civil servants don’t think that ‘thinking clean’ is that important
− “No solutions without political solutions”
• Technical ignorance of local engineers and planners
• Too much corruption in the water sector