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| File:.jpg HUMAN-POWERED
WATER-LIFTERS
|}| The choice of water lifters available is large and varied, making the selection of an
appropriate device difficult. In America and Europe during the 19th century the design of
mass-produced hand pumps evolved by trial and error rather than through scientific
research and development. There is now a large number of adequate, rather than
optimum, designs conceived by local manufacturers, and it is hard to know which pump is
the best for each application. This brief presents an overview of the types of human-
powered water-lifters available, the applications appropriate to them and their comparative
advantages.
Water-lifters can be broken down into the following categories:
|}| •
•
|}| Groundwater (open-well, shallow-well and deep-well pumps)
Surface Water (shadouf, dhone, chain and washer and archimedean screw)
|}| Groundwater
When rain falls, it seeps into the ground and collects in an underground reservoir known
as groundwater. The upper limit of this reservoir, the "water-table", may vary in depth, from
just below the surface (like in a spring or oasis) to well over 100 metres. The only way to
get at this water is to dig down.
Open-well
The simplest and cheapest method of lifting groundwater remains the rope and bucket in a
wide, shallow well. These can operate to a depth of 100 metres, although they rarely
exceed 45 metres, and can last for a very long time without maintenance. It is worth
considering this design before proceeding with more complicated methods.
It may not be possible to construct an open-well if the water table is too deep or if the
foundations are very hard (such as rock) or very soft (such as fine running sands). These
restrictions also depend on the method of construction.
If the groundwater can only be accessed through a bore, then a groundwater pump must
be used. Groundwater pumps can be split into two categories, shallow-well and deep-well.
Shallow-well pumps
Most types of groundwater pump have
a piston that moves back and forth
inside a two-valve cylinder (a valve
allows water to pass in only one
direction - in this case, upwards):
Suction pumps have the cylinder
situated above ground or near the
surface. This means that they can
only be used for shallow wells. It is
called a suction pump because pulling
up on the piston creates a low
pressure ("suction") in the cylinder,
|}| causing the atmospheric pressure
outside to push the water up to the
surface. Because atmospheric
|}| Figure 1: How most types of pump cylinders work
|}| pressure is fairly low, the pressure difference between inside and outside the cylinder is only large
|}| 
Human Powered Water Lifting Devices
| Intermediate Technology Development Group
|}| enough to raise water from a maximum depth of about 7 metres.
|}| It should also be noted that if a shallow-well is used too much, the water-table may fall as the
underground reservoir of water is reduced. If this level falls below 7 metres, the pump will not
work.
Four types of shallow-well pumps are shown below: rower, piston, diaphragm and semi-rotary.
Rower
The rower pump is a simpler and
cheaper version of the traditional
piston pump (see below). Its
simple design means it can be
easily manufactured and
maintained using locally available
skills and materials. This type of
pump may require "priming",
which means pouring water into
the cylinder so that the seal
around the piston is airtight. It is
very important that clean water is
used, to avoid contamination of
the pump and the spread of
water-borne diseases.
Figure 2: Rower pump
Piston
Piston pumps, based on the same design as
shown in Figure 1, are more widely used. There
is a similar risk of contamination from dirty
priming water. In cases where the water is to be
delivered under pressure (such as to a village
water mains) or to a point higher than the
cylinder (such as a water storage tank), a "force"
pump is required. The operation is the same, but
the design is slightly altered so that the top is
airtight. This is done by putting a valve on the
spout and adding a "trap tube" and air chamber
which maintains the pressure (and therefore the
flow) during the up-stroke.
|}| Figure 3: Shallow-well piston pump
Diaphragm
This design is often used for fuel pumps in
cars. The Vergnet pump is an adaptation
of this principle for deep-well use, which
can be used in crooked wells, where a rod-
operated pump would have problems, and
which is fairly easy to maintain.
|}| Figure 4:
|}| Diaphragm pump
|}| 2
|}| 
Human Powered Water Lifting Devices
Treadle pump
|}| Intermediate Technology Development Group
|}| Because leg muscles are stronger than arm muscles, this design is less tiring to use.
Most of the parts can be manufactured locally, the exceptions being the cylinders and
pulley.
|}| Figure 5: Treadle pump
Deep-well pumps
Deep-well pumps can be used for depths over 7 metres because the cylinder or lifting device is
below ground, as shown in Figure 6, often below the groundwater line. They are often known as
"lift" pumps because they do not rely on suction to raise the water. As a result of their depth, they
are harder to maintain than surface pumps, since the pump-rod must be removed to get at the
cylinder. Like suction pumps, lift pumps can be made into force pumps by the addition of a spout
valve, air chamber and trap tube. Three types of deep-well pump are described below: piston,
helical rotor and direct action.
Piston
The design is very similar to the shallow-well pump and is capable of lifting water from depths of up
to 50 metres. However, the cylinder is situated deep underground, below the groundwater-line,
connected to the pump handle via a long rod called a "pump rod" (see Figure 6). Sometimes the
outside pipe, called the "rising main", is of a larger diameter so that it is possible to pull the whole
cylinder up to the surface for repair without taking the pump apart. However, this is more
expensive.
'Helical rotor (or "progressive cavity") '
Helical rotors are capable of lifting water from depths of up to 100 metres. Instead of a piston,
there is a metal "rotor" which has a corkscrew shape and which turns inside a rubber "stator" or
sleeve (see Figure 6). The lever is replaced with one or two turning handles.
'Direct action ( or "direct drive") '
This design is capable of lifting from a depth of 12 metres. The narrow pump rod is replaced by a
hollow plastic pipe which displaces water as the pump handle is pushed down. During the up-
stroke, the pipe acts as a pump rod, the valve on the piston
closes and water is lifted up. The pump is therefore capable of pushing water up the rising main
during both strokes. Because the pipe is hollow, it floats, so the handle does not have to be pulled
up so hard.
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Human Powered Water Lifting Devices
| Intermediate Technology Development Group
|}| Figure 6:
|}| Types of deep-well lift pumps - piston, helical rotor and direct action
|}| Surface Water
Surface water lifters are generally less complicated than groundwater lifters, because the water is
so much more accessible. Four types are described below: shadouf, dhone, chain and washer
and archimedean screw.
Shadouf (picottah)
The basic shadouf consists of a rope, pole, bucket and counterweight and is capable of lifting
water up to 4 metres. The counterweight can be just a heavy rock, but in the more advanced
"picottah" design, one person guides the bucket while the other acts as a moving counterweight.
|}| 4
|}| 
Human Powered Water Lifting Devices
| Intermediate Technology Development Group
|}| Dhone
This design replaces the bucket with a channel. It can also be adapted for picottah-style
operation.
|}| Figure 7:
|}| Picottah-style shadouf and dhone
|}| Chain/rope and washer (or "paternoster")
These pumps have been used in China and Europe
for many centuries. Water is lifted by close-fitting
washers in a pipe. Although in theory it is possible
to construct a vertical chain and washer pump to
raise water to any height, most do not exceed 20
metres. A variation of this design is called the
"dragon-spine" pump, which lies at a shallow angle
to the horizontal. In this case, lifting height is
rarely more than 6 metres. However, the design is
very flexible and can easily be adapted to
circumstances.
|}| Figure 8:
|}| Chain and washer pump
|}| Archimedean screw
Although this design looks quite complicated, it is fairly easy to build using local materials and is
readily transportable. The inside, which is shaped like a corkscrew, is turned by a handle, trapping
water in the cavities as shown in Figure 9. Although on a much larger scale, this is very similar to
the operation of the helical rotor. However, the lifting range is much smaller.
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Human Powered Water Lifting Devices
| Intermediate Technology Development Group
|}| Figure 9:
|}| Archimedean screw
|}| Selecting a water-lifter
The choice of water-lifter is determined by the application and the resources available to the
users. Demand for water may come from domestic, community, industrial and agricultural
needs. It is first necessary to determine:
|}| •
•
|}| where the water will come from (the source)
where it will go to (the destination)
|}| Figure 10 shows the types of source and destination to be considered.
|}| Figure 10: Sources and
destinations of water
Once the source and destination has been determined, it is possible to narrow down the choice
of water-lifter. The table below summarises the options available for different combinations of source
and destination.
Source
|}| Destination
4 (Surface)
5 (hill/tank)
6 (village)
|}| 1. (> 7m)
Deep-well Lift Pump
Deep-well lift & Force
Pump
Dee-well lift & Force
Pump
|}| 2. (<7m)
Shallow well suction
pump or open-well
Shallow-well force
pump
Shallow-well force
pump
|}| 3. (river/pool)
Shallow-well suction
pump
Surface water system
or suction & force
Shallow well force
pump
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|}| 
Human Powered Water Lifting Devices
Table 1: Water-lifter options
|}| Intermediate Technology Development Group
|}| Apart from the source and destination of the water, there are many other criteria which should be
considered before making a selection. Where possible, the lifter should be suitable for Village
Level Operation and Maintenance (VLOM) or Management of Maintenance (VLOMM). This
reduces the reliance of the villagers upon large institutions to sustain the development of the water
supply. A check-list of things to consider when choosing a pump is shown below.
Capital cost
How much does the lifter cost initially?
Will a loan be needed, or does the village have sufficient funds?
Running cost
What is the on-going cost of operating the lifter?
Does the village have sufficient manpower available to operate the lifter for all the time it is
needed?
Maintenance cost
What is the cost of and skill required for the maintenance of the lifter?
Can the pump be repaired in the village or somewhere nearby?
Are spare parts available?
Can the villagers afford them? How often is it likely to need repair?
How long would it take to repair the lifter and what will the villagers do in the meantime?
'NB Maintenance is an integral part of lifter management. For more complicated designs, such as '
the deep-well pumps, it is important that this maintenance is preventative. Problems should be
avoided by regular inspection and servicing of the mechanical parts. Wear and tear will be less
severe this way, and any problems will be solved before they cause more damage.
Manufacture and materials
Can the lifter be manufactured locally using local skills and materials?
Life expectancy
How long is the lifter expected to last before it has to be replaced?
How resistant is the lifter to abuse?
Lift height and flow rate
How much water does the community need? The maximum flow capacity of the lifter should be
matched to the demand from the community, including home, industrial and irrigation needs. (In
the case of pumps, this flow rate given by the flow-rate/lift-height, or "Q/h", curve, which should
be supplied by the manufacturer)
How high does the lifter have to raise the water?
How deep is the groundwater and is it likely to fall in future (such as from over-use)?
Operators
Is the lifter suitable and acceptable to the people who will actually operate it?
Are there health and safety considerations, such as dangerous machinery or risk of
contamination?
Is the operation ergonomic (comfortable to use)? For instance, are the average and maximum
handle forces required realistic for women and children?
Community
Is there a capable community organisation which can oversee maintenance and management of
the device and the water?
Will the users be instructed how to use and look after the device?
|}| Table 2 below gives a summary of some of these criteria for each of the designs. The values given
are very approximate, and should be taken only as a rough guide. As lift height increases, flow
7
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Human Powered Water Lifting Devices
| Intermediate Technology Development Group
|}| rate falls, so at maximum lift, the actual flow rate will be much less than the maximum flow rate.
Also, the flow rates are given for one person operating the pumps, except in the case of the
picottah, which requires a minimum of two.
Table 2: Assessment criteria
|}| Type
|}| SUCTION
Rower
Suction piston
Diaphragm
Treadle
LIFT
Rope and bucket
Lift piston
Helical rotor
Direct action
SURFACE WATER
Shadouf
Picottah
Dhone
Chain and washer
Archimedean screw
|}| Construction
(Traditional/
Industrial)
Traditional
Industrial
Industrial
Traditional
|}| Maximum
lift height
(metres)
7
7
7
7
|}| Maximum
flow rate
(m' 3'/hour)
3
8
10
18
|}| Traditional
Industrial
Industrial
Industrial
|}| 100
50
100
15
|}| 15
1.5
1.5
1
|}| Traditional
Traditional
Traditional
Trad / Industrial
Traditional
|}| 4
8
1.5
15
1.5
|}| 6
6
6
25
25
|}| References and resources
Resources
|}| •
•
•
•
•
|}| Human and Animal-powered Water-lifting Devices: A state-of-the-art survey
by W. K. Kennedy & T. A. Rolgers. ITDG Publishing, 1985.
Water pumping devices - A handbook for users and choosers
by Peter Fraenkel, ITDG Publishing, 1986.
Tools for Agriculture - a buyer's guide to appropriate equipment
Introduction by Iab Carruthers & Marc Rodriguez, ITDG Publishing, 1992.
How To Make and Use The Treadle Irrigation Pump
by Carl Bielenberg and Hugh Allen, ITDG Publishing, 1995.
How to Make a Rope-and-Washer Pump by Robert Lambert, ITDG Publishing, 1990. '
|}| ITDG Publishing
103-105 Southampton Row
London, WC1B 4HH, UK
Tel: +44 (0)20 7436 9761
Fax: +44 (0)20 7436 2013
E-mail: orders@itpubs.org.uk
Website: http://www.developmentbkookshop.com
|}| 8
|}| 
Human Powered Water Lifting Devices
| Intermediate Technology Development Group
|}| Organizations
Sue Sherry
WELL
London School of Hygiene & Tropical Medicine
Keppel Street, London, WC1E 7HT, United Kingdom
Tel: +44(0)20 7927 2214
Fax: +44(0)20 7636 7843
E-mail: well@lshtm.ac.uk
Web page: http://web.archive.org/web/20170717112937/http://www.lboro.ac.uk:80/well/
WELL is a resource centre funded by the DfID to promote environmental health and well being in
developing and transitional countries. It is managed by the London School of Hygiene and
Tropical Medicine (LSHTM) and the Water, Engineering and Development Centre (WEDC),
Loughborough University for British & Southern NGOs working in water & sanitation.
WaterAid
Prince Consort House, 27-29 Albert Embankment, London, SE1 7UB, UK
Tel: +44 (0)20 7793 4500
Fax: +44 (0)20 7793 4545
E-mail: technicalenquiryservice@wateraid.org.uk
Web Page: http://www.wateraid.org.uk
VITA
Volunteers in Technical Assistance
1600 Wilson Boulevard - Suite 710
Arlington, Virginia 22209, USA
Tel: +1 703 276 1800
Fax: +1 703 243 1865
E-mail: vita@vita.org
Web Page: http://www.vita.org
The World Health Organization
Headquarters Office in Geneva (HQ)
Avenue Appia 20
1211 Geneva 27
Switzerland
Tel: +41 22 791 21 11
Fax: +41 22 791 3111
Website: http://www.who.int
Manufacturers
This is a selective list of suppliers and does not imply ITDG endorsement. There is a very large
number of manufacturers in India; more can be found in "Tools for Agriculture" (see below).
Steelman Indisutries
Shanti Dham, Kankarbagh Main Road, Patna (Bihar) - 800 020, India
Tel: +91-612-352530
Fax: +91-612-352872
E-mail: manraw@hotmail.com
Web page: http://www.geocities.com/Eureka/park/4967/
Produce the following handpumps: India Mark II, India Mark III, India Mark IV, Rawman shallow &
force handpump, Rawman special Lift & force VLOM handpump
Ajay Industrial Corporation
4561 Deputy Ganj, Sadar Bazar, Delhi-110006, India
Tel: +91 11 3545291/ 3611140/ 3612204/ 3612206/ 3616816
9
|}| 
Human Powered Water Lifting Devices
Fax: +91 11 3536205
E-mail: ppp@del3.vsnl.net.in
Web page: http://web.archive.org/web/20180329051419/http://ajayindcorp.com//
|}| Intermediate Technology Development Group
|}| Manufacture a wide variety of handpumps including: India Mark II, India Mark III, Afridev, Treadle pump.
|}| Manufacturers
Van Reekum Materials bv
P. O. Box 98, 7300 AB Apeldoorn, Netherlands
Tel: +31 55 533 54 66
Fax: +31 55 533 54 88
E-mail: info@reekum.nl
Web page: www.reekum.nl
Producers of a range of pumping equipment
Mono Pumps Limited
Martin Street, Audenshaw, Manchester M34 5DQ, England, United Kingdom
Tel: +44 (0)161 339 9000
Fax :+44 (0)161 344 0727
Email:info@mono-pumps.com
Web site: http://www,mono.pumps.com
Producers of helical rotor and piston lift device
Monoflo Incorporated
16503 Park Row, Houston, Texas 77084, U.S.A.
Tel: +1 281 599 4700
Fax: +1 281 599 4733
Email: inquire@monoflo.com
SWS Filtration Ltd.
The Bakers Chest, Hartburn, Morpeth, Northumberland NE61 4JB, United Kingdom
Tel +44 (0)1670 772214
Fax +44 (0)1670 772363
E-mail: swsfilt@dial.pipex.com
Manufactures of Rower and other low-technology pumps
H.J.Godwin Ltd.
Quenington, Cirencester, Glos, GL7 5BX, United Kingdom
Tel +44 (0)1285 750271
Fax +44 (0)1285 750352
Deep-well and shallow-well pumps
Prodorite (Pvt) Ltd
21 Leyland Road, Arbennie Industrial Sites, PO Box 2887, Harare, Zimbabwe
Tel: +263 4 663691/4
Fax: +263 4 663696
Products include hand pumps for wells, water storage tanks, Blair vent pipes and sanitary pans
Consallen Group of Companies, P.O. Box 2993, Sundury, Suffolk, CO10 0TY, United Kingdom
Tel/Fax: +44 (0)1787 881115
E-mail: dvallen@compuserve.com
Website: http://web.archive.org/web/20050320053306/http://ourworld.compuserve.com:80/homepages/dvallen/
Specialists in Rural Water Supply & VLOM Handpumps
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