Showing posts with label Sandor. Show all posts
Showing posts with label Sandor. Show all posts

Friday, 25 March 2016

Pipe Repairs Kayima Gravity Fed Water Supply Proposal Brief

Kayima Water
Project Summary
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Project Name:        Kayima Water 
Last Updated:         21 March 2016
Author:                    Sahr O Fasuluku
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Project Business Case
Project Overview
For full background visit the following links:

Kayima is the chiefdom headquarters for Sandoh chiefdom in Kono District, Eastern Sierra Leone, situated about 40km from Yengema airfield and 40 km from Mount Bintumani. It is very remote and it requires 3 or more hours’ travel on bad roads from the main Freetown to Kono Trunk road to reach it. It contains the central clinic, which serves the whole of the chiefdom and refers cases to Koidu General Hospital.
In the 1950's a gravity fed water supply system was constructed at Kayima. The town has extended since then, the supply can't always reach the new neighbourhoods, but there are standpipes at many points where people collect water in buckets.
In 2003 Sahr Fasuluku visited the reservoir dam and took a series of pictures just after the International Rescue Committee (IRC) and townspeople had carried out post-war maintenance and repairs.  They had managed to repair the walls of the dam, line the floor of the reservoir closest to the dam with cement and excavate a small portion of earth up to about 5 or 6 metres back and 20m wide. There was more work remaining to be done, such as excavation of approximately 30m x 20m of soil, repairs to the stop cock which had seized open, perhaps pruning of overhanging branches that had formed an almost complete canopy dropping leaves into the water. About 75% of the original reservoir was completely filled in by earth and organic material that had been washed in over several decades. No maintenance work has been recorded since 2003. 
In January 2014 brown water collected from standpipes in the town was producing a smell. Sahr Fasuluku, Bondu Argue and townspeople investigated the dam and found the previously motorable access road was overgrown with bush and hundreds of young trees several years old. The road had been brushed within the past year or so, but it was still narrow and obstructed.  Upon reaching the turntable it was possible to see the main pipe.  Each length of iron pipe was 4 or 5 metres long and about 6” in diameter. A couple of spare pipes were noticed lying about in bushes but it wasn’t possible to see if they were cracked or eroded.
The reservoir, estimated to have originally been at least 40 meters long by about 20 metres wide, was almost full of organic detritus as was the discoloured water in the small amount of remaining space, approximately 5 metres by about 15 metres wide closest to the wall of the dam. Water in the reservoir had surface scum in places. There was evidence of eutrophication and high levels of total chlorophyll, indicated by the presence of brownish algal biomass.  Assessing total suspended matter visually, it was not possible to see the bottom of the reservoir pool even though it was only between 1 metre and 1.5 metres at its deepest, it was possible to see the bed where it was around 30cm deep or less. The water had a reddish yellow tint indicating coloured dissolved matter. There was a very large leak at the left side of the dam wall and severe damage to the concrete floor of the dam close to the dam wall. 
Bondu Argue, Mohamed Kamara visiting from Saudi Arabia and Sahr Fasuluku assisted the mobilisation of townspeople by youth groups and chiefs and over two days the town voluntarily carried out significant excavation of soil and concrete repairs to the dam wall and dam floor, installed a drystone wall to hold back soil incursion and installed filters to the water outlet compartment. Bondu, Mohamed and Sahr contributed cement, sand, and other materials and provided food on the second day of work.
In April 2015 monitors reported; “The water system is very poor. The taps cannot run during the day time and only a few during the night. No rain yet.” There were an increasing number of leaks in the main supply pipe from the dam. Last reports received in March 2016 indicate 15 separate leaks. Townspeople have been making makeshift repairs using tyre inner tubes but these are temporary and prone to failure. The 6 inch iron pipe suffers from outer and inner corrosion in sections and is over 60 years old but mostly solid. the distance from the dam to the town is approximately 2km.
Urgent pipe repairs have been requested by the townspeople who are concerned about the loss of water and drying up of the supply during the dry season. It is also reported the supply does not reach the clinic. It is vital the clinic should have a potable water supply. It is believed the town has no alternative supply of potable water and no wells. When there is no pipe water, residents drink from rivers and streams which contributes to high levels of water borne diseases.
There is no apparent water safety and conservation committee.
Business Issue/Opportunity
·         Urgent repairs will need to be carried out in the short term to prevent leaks and protect water security for the town.
·         Medium term ongoing leak repairs will be necessary as and when they occur, A water conservation and safety committee will be necessary in the town to organise ongoing maintenance and monitor.
·         Replacement of pipes or pipe sections, renovation, grinding and lining of existing pipes will be necessary in the long term (renovation and section replacement are commonplace in western countries as the cost of large scale replacement is usually prohibitive). Where the pipes are corroded they will need to be gradually replaced with cement-lined iron water pipes, or individually renovated by internally grinding and lining their interiors. Replacement/renovation can be an ongoing process over the next decade with a handful of pipes being replaced/renovated every few years, or it can be one major project funded by a large donor to replace/renovate the entire system.
Project Business Goal
·         Ensure consistent water supply at all times of day and throughout the year. Prevent water wastage and drying up of dam.
·         Improve water pressure to enable consistent water supply to reach the health clinic.
·         Ensure town management and hygiene system is in place and maintains healthy supplies.
Primary Project Objectives
Primary Project Objectives
·         1. Temporary repair of leaks (up to 15 leaks) using 50mmx10m self-amalgamating tape at about £14 per leak (two tapes per leak) http://www.drywall-emporium.com/sos-self-amalgamating-pib-pipe-repair-tape-50mm-x-10m-448-p.asp, plus wire brushes 
·         2. Permanent repair of approximately 15 leaks using the “Perma-Wrap” system http://www.permawrap.com/c/6/perma-wrap  US$55 per leak plus wire brushes and other tools. Demonstration video:  https://www.youtube.com/watch?v=pwUz07ymC64
[ this is cheaper and easier to apply than the alternative epoxy solutions such as Belzona 1111 http://www.belzona.co.uk/en/products/1000/1111.aspx  between £100 and £200 per 2kg not including tools and other hazardous materials(2 to 4 leaks per kit) demonstration video: https://www.youtube.com/watch?v=gS6tGlDbRsQ This is a more complicated and expensive process which requires more technical skill and tools.]
·         Ongoing monitoring and set up a Water Sanitation and Hygiene (WASH) committee in the town to manage, maintain and monitor water facilities, supply and quality. This can be duplicated in other towns in Sandoh
·         Survey and document the current water supply systems and watersheds and prepare a proposal for major funders
Project Benefits
Project Benefits
·         Consistent water supply at all times of day and throughout the year.
·         Water wastage and drying up of dam is prevented.
·         Townspeople do not drink or wash eating implements with pathogen-laden river and stream water
·         Reduction in preventable water borne diseases
·         Water pressure enables consistent water supply to reach the health clinic.
·         Effective town WASH committee to manage and maintain equipment and hygiene practises. Community is capacity-built to maintain sanitary conditions, WASH (Water, Sanitation and Hygiene) resources and facilities.
·         Availability of adequate water supply has a direct impact on health and sanitation
·         Health partnership between community and regional primary health care (PHC) providers has been facilitated.
·         Local incentives, regulation and sustainability mechanisms are in place
·         Local WASH and health knowledge-base is enhanced and inter-agency knowledge-sharing is promoted.
Primary Project Deliverables
Milestone 1 – March to April 2016
·         Project is publicised to Sandoh Diaspora donors and funds raised for short term repairs
·         Funds are raised for permanent repairs
·         Emergency temporary repairs and /or permanent repairs are completed
·         Formation of local WASH committee is initiated
Milestone 2
·         Continuing support, training and capacity building for WASH committee
·         WASH committee has taken on role and responsibility for management and maintenance of water supplies, equipment and hygiene.
·         Current water supply systems and watersheds are fully surveyed documented
·         Project/programme proposal for major funders is ready
Milestone 3
·         Funding secured for major project
·         Major project commenced

NB donors and development actors: Other potential projects that would benefit from your attention include sponsorship for distance teacher training of existing teachers at UMC and FMSS, and schools throughout Sandoh, teaching and learning resources for schools, curriculum development, health clinic resources and support throughout Sandoh, Agriculture and Business Centres support throughout Sandoh, Conservation and environmental protection and sustainable farming, development of the tourist route to Bintumani through Sandoh, road maintenance, cultural and social revitalisation projects, tree planting and town beautification, etc etc.


Sandoh: Our green and pleasant land

Thursday, 22 January 2015

Part 5 - Kayima Gravity Fed Water Supply Dam Excavation and Repair February 2014 - (DRAFT)

Summary: Project to mobilise local authorities and whole community of Kayima, Sandoh Chiefdom. Kono District, Sierra Leone, to repair and renovate Kayima gravity-fed water supply dam to correct heavily polluted water being drunk by towns people, reduce water borne disease, reduce annual soil incursion and increase water resilience through the dry season.

Click on a picture to see it full size

[I lost a lot of the final pictures, which are currently unopenable files on my laptop, due to a corrupted second hand SD card I bought in Sierra Leone.  The only ones I have were taken with my mobile phone. If anyone knows a techie who can open them please, please, please get in touch with me.]




Hand made dam further up stream while works going on. At one point in history the reservoir is reported to have reached this far; a job for tomorrow
Ideas have been suggested for there to be a series of mini dams before the main dam, each reservoir serving to progressively filter and sediment impurities. Ecological filtration and purification systems could be a viable solution here. Other work remaining to be done include fencing the main reservoir to prevent animals polluting the water, a new stopcock or unsiezing the old one if possible, and a regular sustainable programme of maintenance and inspection. There are at least two in the town who have a special interest in the dam, one of whom would provide cleaning and the other regular inspection and design and management of any upgrading projects. Local knowledge about the dam, its technical aspects, history and specifications varies. IRC should be approached to provide any documentation about their findings and their work in 2003. There may be funding schemes around Africa specifically aimed at repairing and upgrading existing gravity fed water supply systems.

After much washing away of black silt damage was more visible; one of the many holes in the reservoir floor

Hand made dam further up stream while works going on

After much washing away of black silt damage was more visible, showing damage to reservoir floor. A whole section of concrete skin had deteriorated due to substandard (low cement, high sand) concrete mix in 2003
 I brought my building contractors up to look at the damage and advise on quantities of cement necessary. They also carried out the concrete repairs.

Bondu Argue, Mohamed Bockarie and I each donated  10 bags cement, and the 3 of us chipped in for sand and gravel and for the excessively expensive metal filter grill (inflated because of its use in diamond mining)

Kai Fasuluku offered the Cocoa Cooperatives Chinese made power tiller mini tractor to haul sand gravel and cement to the Turntable.

The Section chief paid for a gallon of diesel for the power tiller.

Townspeople carried materials from the Turntable to the dam sack by sack on their heads.

VIDEO: Kasiyatama power tiller dropping off materials at Turntable for toting up to dam

Everybody worked voluntarily without pay, we just provided food on the afternoon of the second day.

We used between 15 and 20 bags cement on the floor repairs for the dam, the left overs were used to reinforce the newly constructed dry stone retaining wall.

Years of undermining by water erosion, concrete floor of dam was hollow, suspended, we filled the parts accessible with gravel sand cement concrete

Repairs being made using a rich mixture of concrete, further examination will be necessary to see how well these repairs bound to existing concrete

Showing damage to reservoir floor

repairs being made using a rich mixture of concrete, further examination will be necessary to see how well these repairs bound to existing concrete


repair to filter inlet

replacement filter mesh


slowly refilling, dry stone wall in background reinforced in places with cement

dry stone retaining wall 


Concrete freshly filled cavity outside front of dam (left, facing upstream) previously a major leakage point, this coincides with the egress point for the gutter surrounding reservoir which diverts run-off from the hillside above. Water erosion from this gutter may have been a possible factor in the creation of the cavity.

After 3 days of no water supply  the pressure was on to refill the reservoir. Concrete was left for a few hours and then water was slowly allowed to flow back in to the reservoir, relying on the presumption that concrete would set well under water. The emergency release pipe was left open. 

We had observed during excavation that the bed of the reservoir from about 5 metres away from the dam wall, was sand and gravel. We had asked the workers to stop dredging an area whenever they hit  the sand/gravel layer. Some areas were solid but our feet would sink in in other areas. We found this was because organic matter had become impregnated in with the sand and gravel forming a bog. During refilling we proceeded to 'wash' the sand and gravel by stepping up and down with our feet. The sand settled quickly but the organic matter would mix with the water and flow away in the mild current. After some time stamping in one area the sand and gravel would begin to solidify under our feet and the amount of organic silt floating away would decrease. We did this for a couple of hours. Although not completely finished, time limitation meant we had to stop. We left instructions to allow the water to flow for a few more hours and then the emergency waste pipe could be closed to allow the reservoir to fill up overnight. The supply tap to the town was to be kept closed during refilling. 

It was impossible to ascertain how much reservoir water would filter through the sand and gravel floor of the reservoir. 

The next morning the supply tap to the town was opened, I took a first sample from the mains where it crossed the river at the outskirts of town. Visually the water was completely clear with only a small amount of  suspended particles. I had to remove the bottle label to avoid confusing it for purchased bottled water (that clean!).  

The second sample taken some time later from the town appeared more polluted, the third and fourth samples taken the following days were slightly less polluted than the second but nowhere near as clean as the first. Compared to the pre-works condition of the water there was noticeable improvement, but not satisfactory. Ongoing monitoring will take place during the current dry season (2015) leading up to April, to compare water quality and resilience. 

first and second post-works water samples


first, second and third post-works water samples


first, second and third post-works water samples

(left) first, second and third post-works water samples (right) fourth sample

In the following days, we took a further trip up to the dam to investigate the cause. We found fresh evidence of small animals and concluded this could be a factor in disturbing the water. We hypothesised that animals had probably been scared away from the region of the reservoir by several days of intense human activity and had now returned.  

small animal tracks in area around reservoir





Part 4 - Kayima Gravity Fed Water Supply Dam Excavation and Repair February 2014 - (DRAFT)

Summary: Project to mobilise local authorities and whole community of Kayima, Sandoh Chiefdom. Kono District, Sierra Leone, to repair and renovate Kayima gravity-fed water supply dam to correct heavily polluted water being drunk by towns people, reduce water borne disease, reduce annual soil incursion and increase water resilience through the dry season.



Click on a picture to see it full size









We used sticks to mark out the holes and cracks in the concrete floor  (right facing downstream)


Mohammed Bockarie (left centre) and others

We used sticks to mark out the holes and cracks in the concrete floor  (right facing downstream)

We used sticks to mark out the holes and cracks in the concrete floor  (right facing downstream)











IRC repair project in 2003 went back as far as the front of large rock on the right of the picture. In 2014, in addition to removing 11 years of detritus which had refilled the reservoir, the town extended excavation to where I am standing with Saa Kaimondo (centre distance) 

We had dscussed using bushsticks to retain the earth bank and slow down further incursion, but the towns people decided this would be temporary, bush sticks would rot quickly and disintegrate, we also  discussed planting deep rooted grasses or water reeds. In the end the townspeople voted on using a barrier of locally available rocks to be gathered from nearby.





Video: Starting dry stone wall for earth retention