Kopanga Clinic Well Report

KOPANGA CLINIC, BOREHOLE & RETICULATION SYSTEM INSTALLATION
PROGRESS REPORT
From the arrival of East Africa Drillcon technicians on site on Tuesday 10th July,
2012 up to the completion date of Wednesday 18th July, 2012, the following
works have been completed and the borehole performance duly recorded.
Water Storage: A 6,000 Litre, high level PE Tank and 3 metre 4 leg steel tower
has been erected adjacent to the clinic as the main water supply not only for clinical purposes but to another 6,000 Litre PE Tank situated in the vicinity of the entrance gate, which is to be utilized as a distribution point for the community (i.e
Selling Point). This tank is fitted with a 1” ballcock valve at the inlet and a 1” PVC
Valve at the outlet
Reticulation: 0.4metre deep trenches were excavated from the borehole point
to the high level tank with off shoots to the control panel, clinic and the distribution tank.
The water is being transmitted through a 32mm diameter HDPE pipe with a 10bar
pressure rating. All connections have been made with non corrosive compression fittings and PVC valves. Therefore from the submersible pump intake to the
end user all pipework and connections are non corrosive, apart from a G.I. Tee
situated at the borehole headwork and the GI outlet pipe at the tap stand.
The distribution point is a 3/4” tap stand and water meter located above a concrete pad and soakaway—see Page 5 for photo
-2Borehole & Headworks:
The India Mark II Hand pump originally installed was removed and replaced by a
Grundfos SP2A-23 3phase 1.1kw submersible pump set at a depth of 70 metres below ground level supported on
40mm x 16 bar HDPE and 4mm diameter
plastic coated safety wire, connected to a
6” steel borehole cover plate.
A 25mm diameter HDPE pipe is fitted adjacent to the riser pipe for water level
monitoring.
The hand pump and riser pipes are stored
adjacent to the clinic and please note that some of the G.I. riser pipes are quite
heavily corroded.
In the event of a low water situation a high and low level monitor probe is situated
3 metres above the pump intake and connected via the headworks junction box
to the control panel at the clinic, thus preventing a motor run dry scenario.
A short test was undertaken on Tuesday 17th July following installation and Kenya Power Supply permitting (power cut as soon as we had finished the work) the
results were as follows:Depth of Well
Casing & Screen installed
Standing Water Level
Pumping Water Level
-
Yield at start of test (2pm)
Yield at end of test (4pm)
-
79 metres
125mm O/d uPVC
16.00 metres
63.00 metres (with a minimal drawdown
in the last 10 minutes)
2,400 litres per hour
2,000 litres per hour
From the above information we can safely assume that the well will produce a
constant rate of 1,500 litres per hour. As we are not aware of the main aquifer
zones and unsure of water flow past the pump motor we have taken the opportunity to fit a timer in the control panel which has been set to pump for 1 hour and
rest for 1 hour (i.e: at 2,000 Litres per hour = 24,000 Litres per day). This sequence will allow the motor sufficient cooling time. We had previously fitted a
cooling shroud on the motor, however this had to be removed once we noted the
wells limited diameter.
-3-
Lockable Protection Box for Water
Meter and Non-Return Valve
Electrics: From the 3 phase power supply to the control panel a 6mm2 x 4 core
armoured cable has been utilized.
From the control panel to the borehole (215 metres) a 2.5mm2 x 3 core armoured
cable for power supply and a 1.5mm2 x 2 core armoured cable for the high/low
level monitors have been installed.
The power supply from the borehole headworks junction box to the pump motor
is a flat 4 core 2.5mm submersible cable.
Situated in the elevated water tank is
an automatic electronic float switch
operated by a 1.5mm2 x 2 core armoured cable running from the control
panel thus preventing an overflow situation and automatically starting the
pump when the tank level reaches
2/3rds capacity.
A lockable weatherproof security protection box for the control panel and
A.V.S. has been installed.
-4Conclusions & Recommendations: On the day of commissioning we were requested by representatives of P4P and Start with One (Len Eastwood) to make a
90 degree Tee connection on the downpipe to provide water to the guesthouse.
The items required were 3 No. Adaptors; 1 No. 1” Peglar gate Valve; and 1 No.
32mm P.E. Tee. These were purchased in Nairobi and couriered via G4S to
Migori for onward collection.
The outlet for the clinic is also a 90degreee Tee from the gravity line and fitted
with a valve and lockable protection box. We have left approximately 20 metres
HDPE 32mm diameter to assist the plumber during final connections.
Sospeter was shown the mechanical workings of the control panel and how to
record water meter readings and suggested that he kept a daily record of water
usage and sales to assist with power bills every month.
Based on a daily availability supply of 24,000 Litres it is unlikely that the pump will
be automatically operating more than 3-4 hours per day, obviously demand will
increase during drought situations and diminishing springs in the surrounding area.
Due to the unreliability of Kenya Power & Lighting, we have taken the opportunity
to fit a 3phase A.V.S. (Automatic voltage stabilizer) as an added protection
against power surges etc.
From past experiences of installations of this nature it is imperative that the people in charge keep constant records of water usage and that all monies generated are kept in a safe place ready to help with monthly power bills and any future
maintenance.
May we take this opportunity to thank all the staff concerned with assistance
throughout this project and especially Sospeter who has been an outstanding
partner throughout the works.
We were also asked by Rev. Kephas to visit a borehole site approximately
3.3kms from the clinic to give an assessment of requirements to provide another
water source for the community. This visit was undertaken on Wednesday 17th
July and a report and budget costing will follow in the next few days.
B. M. & E. J. Brooke
E. A. Drillcon Limited
-5-
Borehole Weatherproof, Lockable
Protection Box
Distribution Tap Stand
Main sub-structure for tank support