Values in Spatial Development

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Water

Grey Water Harvesting Tool

10 years of Blue Revolution

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For thousands of citizens of mumbai, a clean-predictable supply of water is a distant dream. It is sold at a highly subsidised rate of Rs.5 per 1000 liters, a microscopic price to pay for a well-off citizen living in our gated high-rises. On the flip side, citizens in slums or gaothans often pay upto 20-50 times more and end up surviving on around 20 litres a day. Notwithstanding the time and effort invested in arranging the logistics of carrying and storing the water manually.

Upto 2,000,000 people living in Mumbai do not have legal access to water

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Project Impact Calculator

Number of residents in the project:

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Consumption of water per capita per day

157

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0

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litres by the society!!

Out of which,

87

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litres is Grey Water.

Thus, total grey water harvested by the society per day:

0

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litres at a 75% efficiency rate

Daily

Flushing Gardening Washing clothesWashing cars

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per person requires up to

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litres, leaving hardly any excess.

Water saved per year:

0

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litres!!

Water consumption patterns

Water consumption patterns

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**activities in grey can use recycled grey water**

On the other hand, how much rainwater can we collect?

Catchment area (sq.ft) :

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Annual rainfall in your location (mm) :

0000

1770

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(Mumbai averages 2400mm)

Expected rain water harvested per year :

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litres

Nowhere close right? We are growing vertically. Rainwater harvesting depends on the horizontal spread of our buildings, thus to sustain growing populations, water harvesting must be localised on a building level.

How much does this cost in the short-term? and what are the economic benefits in the long-term?

To implement a grey-water harvesting system, planning and designing the plumbing system of a building requires one further step than business-as-usual.

Lets take a look at the different components, how they compare to usual and how much they cost

Component

Cost/Effort

What is the norm?

Column 4

For each apartment, separate down-take pipes from each bathroom (floor drainage), kitchen (sink), and washing machine (if any) from the WC’s or toilets (human waste)

Increased Plumbing and Piping costs

All drains converge into one outflow source.

find per bathroom plumbing and material/ unit

Build an independent Grey water harvesting capture tank (underground)

Extra tank, more space

There are no rows in this table

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