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How much will it cost to
catch rain?
When community come togetherto harvest rain, the
per-capitainvestment goes down. For
instance, Panchsheel Park Colony
about 1000 residents pooled inRs 4.5 lakh to harvest more
than170 million litres of waterannually.
Rainwater harvesting methods aresite specific and hence it
isdifficult to give a generalised cost.
But first of all, the majorcomponents of a rainwater harvesting
system - rain and catchment area - areavailable free of cost.
A good proportion of the expenses would be for the pipeconnections.
By judiciously fixing up the slopes of roofs and location
of rainwater outlets, this could be brought down considerably.
However the costvaries widely depending on the availability of
existing structures like wells andtanks which can be modified and
used for water harv esting.
Typically, installing a water harvesting system in a
building would costbetween Rs 2,000 to 30,000 for buildings of
about 300 sq. m. The cost estimatementioned above is for an
existing building. For instance, water harvestingsystem in the CSE
building in Tughlakabad Institutional Area, Delhi, was set up
with an investment of Rs 30,000 whereas those in the model
projects ranged
between Rs 70, 000 and Rs 8 lakh. The costs would be
comparatively less if thesystem were incorporated during the
construction of the building itself.
Some basic rates of construction activities and materials have
beengiven here, which may be helpful in calculating the total cost
of a structure. Thelist is not comprehensive and contains
only important activities meant toprovide a rough estimate of the
cost.
a. Unit cost of construction activities.
Item Unit Rate (Rs.)
Excavation in soils cu. m. 90.00
Excavation in rock cu. m. 150.00
B rick work with ceme nt mortar (1:6) cu. m. 1400.00
Plain cement concrete (1:3:6) cu. m. 1500.00
Reinforced cement concrete (1:2:4) cu. m.4700.00Including steel
bars, shuttering etc.
cu. m. 4700.00
PVC piping for rainwater pipes - 110 mm diameter -
200 mm diameter
Metremetre
165.00275.00
Making borehole in metre 165.00Soft soil(with 150 mm diameter
PVC casing)
metre 180.00
b. Ferrocement tanks with skeletal cage
Capacity of rooftop water harvesting system in litres
5,000 6,000 7,000 9,000 10,000
Total cost inrupees
12,430 12,975 13,970 14,380 15,800
Source: Action for food Production and United Nations Children's
Fund, Rooftop rainwaterharvesting systems
c. Plastic tanks:
Technology
Urban
People
Harvesting
System
Components
Design
Construction
Maintenance
Cost
AT A GLANCE
The Potential
Initiative
Practices
Projects
Legislation
In your building
Traditional
Practices
SEE ALSO
No water
Water war Look up!
How to harvest
In rural areas
In urban areasJal yodhas
Way ahead
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waterharvesting.org/People/People.htmhttp://www.rainwaterharvesting.org/Urban/Urban.htmhttp://www.rainwaterharvesting.org/Rural/Rural.htmhttp://www.rainwaterharvesting.org/Solution/Solution.htmhttp://www.rainwaterharvesting.org/Conflicts/Conflicts.htmhttp://www.rainwaterharvesting.org/Crisis/Crisis.htm
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Available as finished products in various capacities. The cost
of these tanksranges from Rs 2/litre to about Rs 3.5/litre.
Other brands available in the market
Brand name Unit cost (Rs. Per litre)
Hindustan, Jindal 1.80
Storex, Ganga 2.75
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