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PROJECTS |
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Establishment of a
Rain Water
Harvesting System at Boosa Maha Vidyalaya,
Galle, Sri Lanka |
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Project Area |
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Boosa Maha Vidyalaya, Galle |
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Duration |
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June – August 2010
(2 months, Project
Completed) |
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Funded
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Stichting Waterhelp |
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Objectives |
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This project was to install a
rainwater harvesting system with
following objectives; |
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To improve the availability of water
resources to irrigate an acre of arable
land, belonging to the school. Presently
this land is used to grow variety of
local vegetables and salads as well as
few high value Mediterranean crops.
While the growing of local vegetables
are educational and used to supplement
the feeding of the children (providing a
free mid day meal) other than the
harvesting of high value crops such as
salad varieties, herbs are aimed at
increasing income towards activities and
welfare of the children |
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To reduce the cost of pipe borne
drinking water being used to flush
toilets |
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To reduce the cost of pipe borne
drinking water being used to water the
vegetable garden |
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To reduce the negative impact on pH
level of the soil as the pipe borne
water carries chemical residue (high
levels of hardness to protect piping |
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Harvest the rain water for vegetable
gardens and maintaining of toilets in an
area which is described as wet zone with
an annual rain fall of 2540 mm |
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Educate the children of importance of
rain water harvest and it's benefit.
Usage of environmentally friendly cost
free source of water |
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Make the school as the model school in
the region in agriculture education |
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Activities and Results
achieved |
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Figure 1, shows the final implemented RWH
system including the roofs that were used and connection to
collecting tanks. The excess overflow (when the collecting tanks
are full) of the 3 cement tanks were connected to the well. In
this way as much rainwater as possible would infiltrated thus
building an extra groundwater buffer for drier times. |
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Figure 1: Plan of the final implemented RWH system at Boosa
School |
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1 |
Installation of the Valence Boards |
Activity:
Not all roofs on the
Figure 1 had
rainwater gutters. These were
installed, but some of the roofs also did
not have the required valence board to
attach the gutters. This was the
first phase of the project and was
undertaken by Boosa School. |
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Results: Boosa
School installed valence
board on the roof areas of RA 3, 5, 8, 9
and ½ of RA11. |
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2 |
Installation of the RWH system |
The work commenced on the
7th of June 2010, in
consultation with Boosa school. RWH
system designed for the school was
modified to accommodate the changes
requested by Boosa school to the original plan. |
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Activities:
Following is a list of activities that were
carried out. |
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Guttering: Some of the required
roofs were to be
guttered. |
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Tank types: Rainwater
run-off from some of the
roofs were to feed 5
on-the-spot handcrafted 8m3
ferro-cement tanks and the
other roofs feed into
smaller 3m3
plastic tanks |
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Filters: Each tank is
to be protected from dirt by
a Debri Filter, of which the
filter material is made of
natural products |
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Overflows: The
overflows from the five
larger tanks were
directed to the existing
well. The overflows of the
smaller tanks were
directed to
nearest drainage
channel to prevent
uncontrolled overflows that
may cause erosion. |
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Pipes:
All piping, including the
ones that run to the
end-user stations (gardens
and poly tunnel) are
slightly running
as much as possible
underground. |
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Poly
tunnels: Pipe will
supply the poly
tunnel and will end in a tap
attached to a pole. |
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Results:
Following are the results of these
activities. |
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Gutters were installed in Roof areas RA3, RA5, RA8, RA
9, ½ of RA11 (named in figure 3).
Photo 1:
Gutters installed >> |
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Tank No. 1
was placed in a elevated
base and was fitted with 2
extra taps, class room sink
and one outside (to take
the balance water not
reached to the sink).
Tank no. 2
supply water to staff
quarters.
Photo 2: Tank
No 1 providing water to
class room sink >> |
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Tank No. 3,
4, & 5 was connected and
pipeline was provide to a
tap stand near the poly
tunnel. |
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Photo
3: Tap stand near
poly tunnel |
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4: Tank No. 5 |
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Photo 5: Tank
No. 3 &4 >> |
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Tank No. 6,
collecting from the roof of
the toilets ½ RA 11 provide
water to the pineapple
garden below by a separate
tap stand.
Photo 6. Tank No 6 >> |
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Tank No. 7 & 8
are connected to a new tap stand
distributing water from
these two tanks located
near the toilet.
Photo 7:
Tanks 7 & 8 >>
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The cement
tank No. 9 distributes water
to the urinals below.
Photo 8: Tank
No. 9 >> |
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Photo 9:
Urinals >> |
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The plastic
tank 10 connects to the pipe
stand nearby, providing
water for gardening.
Photo 10:
Tank No. 10 >> |
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The plastic
tank 11 placed on a base and
connected to tap stand near
by to provide water to the
gardens and to the Principal's
toilet.
Photo 10:
Tank No.11 >> |
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All tanks are
fitted with a stop valve,
therefore each tank can be
operated separately for
cleaning and maintaining
purposes.
Photo
12: Stop valve >> |
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The stop
valve at tanks no.
3,4,5,6,7,8 and 9 is
protected by a gully with a
lid to prevent damage.
Photo 13:
Gully >>
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Each tank is
fitted with derbies filter
which contain pebbles and
charcoal as filter media in
a plastic bucket or basin
and a mesh covering it to
prevent entering of
mosquitoes.
Photo 14:
Debris filter for cement
tank >> |
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Photo 15:
Debris filter for plastic
tank >> |
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Overflows of
tank No. 5 and 6 are
connected to the well for
ground water recharging.
Overflows of
all other tanks are
connected to the near by
drains and covered with mesh
to prevent entering of
mosquitoes and other animals
into the tank.
Photo 16:
Over flow of tanks >> |
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Tanks
1,2,3,4, 5,6 and 9 is fitted
with a first flush devise,
so that any dust collected
in the roof is first
discarded before it enter
the tank. |
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3 |
Awareness program |
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Activity:
The awareness
program consist of two
parts: |
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A maintenance
training performed by LRWHF
prior to commissioning;
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An awareness
program conducted by the
school to the pupils and
teachers |
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Results:
LRWHF masons instructed
the workers on operation and maintenance
of the system during construction. |
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4 |
Maintenance program |
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Activity:
The awareness
program consist of two
parts: |
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Instructions
how to keep the first flush
system ready to collect the
first dirty water from the
roofs, and how often to do
this; |
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Instructions
on how to clean the two
different tanks; |
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Instruction
how to clean and/or replace
the materials of the debri
filters at each tank; |
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Explaining by
showing in reality what
maintenance is required and
how the debris filters
should be cleaned; |
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Results:
Instruction manual on how
to operate the first flush, clean the
filters and clean the tank was handed
over to the School Principal along with
leaflets and Manual of rain water
harvesting
in Sinhala |
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Photos |
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Picture - A few of the RWH Tanks |
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