Costs of constructing a Rainwater Harvesting System.pdf

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4/29/2016 Costs of constructing a Rainwater Harvesting System

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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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Costs of constructing a Rainwater Harvesting System.pdf