Anatomy of a Shallow Well Part 3

Pump assembly.

The pump is one of the most interesting parts of a well or borehole. It’s definitely the most complicated, the most likely to break and sometimes the most controversial (to learn more see EWB Volunteer Owen Scott’s series on the Playpump, as well as a new Frontline documentary). It’s also the part which most frequently breaks down and renders a pump non functional. It’s these breakdowns which in theory should create a financial driver for people who have been trained to repair pumps, and for small grocery owners to stock replacement parts for sale, this unfortunately is only sometimes the case.

When we last left our well, it had been covered with a concrete pedestal and apron to protect it from contamination, and the “civil works” and washing slab had been built from bricks and concrete. We arrived late in the afternoon in a minibus carrying all the parts required for the Afridev hand-pump and right away set to work.

A “foot valve” assembly in the bottom cylinder  will keep water inside the pipe that the hand-pump pumps through. This assembly is cemented with PVC solvent cement and a small fire to the PVC pipe. Then, pipe centrizers are slid onto the pipe. These guide the rope holding on to the bottom cylinder, in case it should come unglued. This is slid down the well, and the pipe is measured for length, ensuring that the foot valve is at least one foot above the bottom of the well to stop it from being clogged.

An assembly to hold the pipe in place and centered is cemented to the pipe and it is slid back down the well. The ropes are tightened, and the assembly is bolted to the riser pipe. On top of this the pump casing is also bolted, and the Afridev starts to take shape. Now the plunger, and plunger rod are attached to two more rods and descend down the well. The plunger is a white plastic piece (similar to a foot valve) with a bobbin that creates a valve and is used to raise the water level up the PVC pipe.

The rod is then descended down the well, attaching to interlocking rods as necessary to reach the bottom of the pipe. The top rod is measured to length and marked, then the whole thing comes back out of the well to cut the rod to length.

Next, a fulcrum is attached to the top of the rod. This is where the pump handle is attached, allowing a person to move the rod up and down from outside the casing. A pin and bearings are attached to this fulcrum, and the pump handle attaches through the casing to these. If that makes any sense at all, for some clarity hover over the picture.

Now, the pump is functioning fine, and all that remains to do is  re-attach the cover, and get a bucket.

 

 

For more pictures from today, and the rest of the well construction see my online Picassa album at http://picasaweb.google.com/105874389983784481295/DanInMalawi02#5485966990096667314

How Inappropriate!

Appropriate technology. It’s quite a buzz word in the development community and only a few years ago it was on everyone’s lips at EWB. Fast forward to the present day and in some circles within our organization it has become taboo. To mention appropriate technology makes you look outdated, old-fashioned and a little ignorant, “don’t you know that we tried that and it didn’t work?”.

Our founders and co-CEOs sarcastically talk about their vision founding EWB as flying over Canadian-designed solutions to technical development problems overseas in helicopters. As an organization we very quickly changed this approach to be more balanced and addressed the needs that weren’t being fulfilled in the development community. As I think Playpumps International has demonstrated very well to the development community for an NGO to be centered solely around a technology or technology in general is flawed and can be a hindrance to a country’s development more than a help (wondering what I’m talking about? See Volunteer Owen Scott’s posts on the playpump). “Development” can be defined as many things, but primarily it is a process of people, and thus primarily you should be involving people. That is however not to say that appropriate technologies should not play a part.

My placement is actually highly centered and focused on an “appropriate technology”, Baptist Drilling (named after Baptist Missionary, Mr Terry Waller) and how it can be employed in a sustainable business. Baptist drilling is a manual drilling technique that falls into a group of “percussion drilling” methods. Percussion drilling essentially means moving a pointed weight on a cable (the “bit”) up and down to create a dent in the ground. This dent is the filled with water and a valved tube is lowered to remove the resulting muddy sludge, then the process is repeated. Baptist Drilling only differs slightly in that the bit is on the end of the valved tube, and thus you save time not having to replace the two pieces.

Compared to drilling with a machine Baptist Drilling (and many other manual methods) are cheaper and less complex as well as being able to reach remote areas where the roads are impassable for drill rigs. However, a manual drill cannot penetrate stone layers When compared to digging wells by hand it reduces risk to the digger, is easier to protect from contamination and can penetrate deeper into the aquifer, reducing the likeliness of winter dry-up. All in all, it’s an advantageous technology and well worth pursuing. The challenge is employing this drilling technique in a profitable way. How can you turn manual drilling into a business?

Where we’re planning to start is where there is already demand  in Malawi, the NGO sector. Drilling wells for NGO's seems the logical step to reduce risk as we launch a new business. This is where the demand already exists in the sector and provides the opportunity to gain experience with the drilling technique, and reduce the unknowns at lower risk (where a large NGO could absorb costs in the event of problems).

More interesting though is whether we can find demand in the private sector. Namely, are there individuals living in rural areas of Malawi who are both able and willing to pay for clean water? This introduces a plethora of issues, the most complex being assigning a monetary value to safe drinking water.

 

Hungry? Check out the new recipes section of this blog! I’m looking to turn it into a cookbook to sell as a fundraising item for the Waterloo chapter of Engineers Without Borders Canada and would love your feedback.

Daniel

The photos and the background on Baptist drilling in this post were taken from the Connect International (www.connectinternational.nl) manual on Baptist Drilling by Henk Holtslag and John de Wolf.

Anatomy of a Shallow Well Part 2: Civil Works

Civil Works, the concrete structures surrounding a well are what is most distinctive in the appearance of any protected water source. Shallow well or borehole.

This is a continuation of my journaling of 4 days constructing a shallow well, to view the first post click here.

When we last left off, Foster had just finished constructing the concrete slab which protects the shallow well from surface runoff and contamination if it enters the ground water aquifer. Foster and I arrived on site in Mwambasi and he quickly bounded from the motorcycle to join the rest of the men in lifting the heavy concrete slab out of the ground, and strategically rolling it to position it over the well opening, into freshly laid cement to seal everything in place. I was entertained seeing him bound, as he usually a very soft spoken man, who enjoys deporting himself like a bwana[1], and takes himself very seriously.

Once the slab is firmly in place, and after a short lunch break of usipa[2], beef, vegetables and nsima Foster, using string and sticks outlines the boundaries of where the concrete apron and washing station will be located. Then bricks are laid for the washing station. Surprisingly this has filled a whole day with work, and we leave a layout and few laid bricks to return and do more tomorrow.

Due to the joy of internet blogging time travel, we can continue on to the next day!

On our return the next morning foster and I found all the brick laying completed, and the civil works beginning to take form. Bricks outline the lip of the apron surrounding the well as well as along the spillway which takes excess water away from the pump. In the picture you can also see the concrete washing sinks taking distinctive shape.

The team then gets to work meticulously covering the surfaces with concrete, and filling the base of the apron and spillway with coarse gravel and concrete. While the concrete is still wet, a wire loop is secured under where the handle will be, to allow it to be locked preventing unauthorized use. This feature on wells is viewed as controversial as it allows the committee managing the upkeep and maintenance to deny people access to the safe water if regular payments are not made to a maintenance fund.

Once all the work of spreading and forming concrete has been completed,  the civil works have finally taken their shape and need to be left to dry before the pump installation can be done. But before all this happens, the date, donor organization and name of the Village Headman are scratched into the surface of the concrete. It gives me pause to wonder when so many organizations struggle to create a sense of ownership over wells in communities the name of the community is not even placed on the well. Instead the name of the donor organization which paid for the installation with no plan for maintenance is permanently etched in concrete, ever a reminder to people they are the object of charitable programs.

-Daniel

---

[1] Boss in Chitonga

[2] Small fish, the size of sardines

Anatomy of a Shallow Well Part 1

Today was a whirlwind of a day. I was sitting at home, reviewing the requirements for my University of Waterloo work-term report when Foster, my counterpart and host-father bursts into the house clad in motorcycle gear and says, “Danny, we must go see the well. Time is against us.” So I strap on my motorcycle helmet and we jet off to Mwambazi, a village in the Timbiri Traditional Authority (TA), the same TA in which we live. It’s there that World Vision, an NGO that needs no introduction has funded the construction of a conference centre and nursery, and has hired Foster to install a shallow well to provide safe, clean water to the facility.

When we arrive, it turns out time wasn’t against us, and we are the first there so Foster shows me the well shaft which has already been dug and lined with bricks and cement mortar. Fairly quickly the rest of Foster’s construction team arrives and we get to work. The first task is mixing the cement with sand, gravel and water to obtain the correct consistency.

 

 

While the mixing is being done, Foster calls for the housing for the pump. The one provided for this job by World Vision is an Afridev model, a fairly standard and durable pump. This pump is however designed for boreholes and not shallow wells. The housing has 3 legs with jut down and are wide enough to support it in a borehole, but not wide enough for a shallow well. To compensate for this Foster places the housing in a hole, and fills it with sand. This will allow him to build the concrete skirt which protects the well above the level of the legs, which will simply hang down into the well.

Normally the Afridev pump is used for boreholes, which are narrower wells dug by a drill rigs. Boreholes go much deeper and are able to tap aquifers which are unreachable by hand dug wells. In the case of this well however the aquifer is very close to the surface, only two or three meters down and, as Foster puts it, “You could use anything to reach this water.” The Afridev is very durable, efficient at pumping and spare parts in the case of a breakdown are more readily available than any other pump model, that’s why World Vision has chosen to use it for this installation. It is however more expensive.

Next bricks and a sheet of plastic are laid down to give the apron shape, and the region is filled with concrete.  Segments or rebar are added to the concrete, to increase it’s strength and flexibility. Once the mould is filled, Yolam Kamanga, Foster’s Nephew (who has also been trained as a Marion Medical Mission Maintenance Assistant for that NGO’s water points) smoothes out the layer.

Next, moulding for a second layer is added, and a shelf is created out of the concrete. This will allow a spillway to be added after the concrete sets so that water drains away from the pump and doesn’t lie stagnant allowing mosquitoes to breed.

The concrete takes approximately five days to set so we won’t be returning until Tuesday to move the apron over the open hole and complete the rest of the concrete “civil works” which surround a protected water point as well as install the pump. So there’s still much to do. Tune in next time for part 2!

To see all the pictures from today, have a look at the link below:

View Full Album

 

 

 

Daniel

Why spend all this time in Malawi?

Besides the beautiful weather and wonderful people? There is a reason this should be more than a vacation.

Some Background

In some documentation the Malawian government had released in the past, a coverage rate in rural areas for safe water points has been quoted at over 80%. If this were in fact true it would be an astounding feat, and mean a lower fatality rates from water-born pathogens, and dehydration from diarrhoea.

Unfortunately it is far less than 80% of rural Malawians who have access to safe water. This is not so say that documents form government offices are lying but not all factors have been considered when coming up with this figure. Essentially, the issue is a question of statistics, thankfully Owen Scott (find his blog here), one of EWB’s African Programs Staff (APS) in Malawi has produced to great pie charts for the lest statistically inclined of us (as a note, these calculations are only really “back of the envelope” and just like the 80% are also inaccurate, but they are used here to give an idea of the challenges to effective water coverage).

The figure of 80% water coverage comes from the calculation of summing the number of safe water points in the country, and the number of people in rural areas, and determining how much water is available. As an example, a borehole is said to have the capacity to provide safe drinking water to approximately 150 people, a shallow well to approximately half that. Based on these numbers, Malawi has a certain number of water points which can provide water to a certain number of people, and a certain population. Subtract the two and you arrive with just over 80% coverage in rural areas.

The first factor not considered is that, wells don’t spring eternal (I couldn’t resist a water pun) and eventually the pump falls into disrepair, either allowing contamination of the water source, or preventing users from drawing water altogether. Strategies vary from district to district, but in Nkhata Bay District where I am placed the government supports a network of private individuals who have been trained (either by the government or a number of NGOs with water programs)  to maintain these pumps. However there are obstacles which often stand in these Area Mechanics (AMs) way.  Often communities do not have the funds to pay for the labour or spare parts in the repair either forcing AMs to work on a voluntary basis, bankrupting some of them or leaving the well in disrepair. An increasing obstacle in Nkhata Bay district is that spare parts simply are not available as the supply chain from the manufactures in the south to the grocery and convenient stores around the district who are meant to carry them has broken down. Non-functionality puts our pie chart like this.

The second thing to consider is inequitable distribution of water points. This occurs for various reasons, district water offices don’t know where water points are, some NGOs don’t communicate with government before drilling, and sometimes instead of repairing an existing well, an organization will drill a new well (for various reasons, sometimes because they don’t have the capacity or scope of program for repairs, sometime to report a higher number of wells installed to their donors).   Factoring in unequal distribution Owen’s pie chart now looks like this.

My Piece of the Pie

Where my work fits in is mostly addressing challenges in the ‘non functionality piece’ of the pie chart. I’m living and working with Foster Longwe an area mechanic who services wells around Mpamba and partnered with the Central Church of African Presbyterianism (CCAP) Synod of Livingstonia Water and Sanitation Coordination Office (CCAP WatSan). CCAP WatSan has a plethora of water and sanitation programs that keep their office in Mzuzu, the largest city in the the Northern Region of Malawi extremely busy.

For various reasons, which could be a blog post unto itself most AMs are not successful at their work. This makes Foster an exception. He has been successful as an area mechanic and sells spare parts from his grocery store to other AMs as well as using them in his own repairs. Foster’s success has drawn the attention of CCAP WatSan. They would like to enable Foster to be able to not only repair wells, but install wells for private individuals around Mpamba. To do this they are helping him secure loans to purchase equipment for Baptist Percussion Drilling, a manual method for digging boreholes and looking for ways to secure loans for his potential customers. Additionally CCAP WatSan is looking to become a supplier of spare well parts for the Northern Region, and use Foster as a distributor to other spare parts shops in Nkhata Bay District. Foster is already a very entrepreneurial person, he runs his grocery and owns a minibus (bus about the size of a van, pictured here)  and I’m working with him on what business considerations he needs to have in mind to make this program a success and hopefully determining how similar approaches to well installation can be applied in other districts.

Daniel