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ROYAL
BHUTANESE EMBASSY’S RAINWATER HARVESTING SYSTEM |
RAINWATER AVAILABLE FOR HARVESTING
Total rooftop and surface area: 31,363 square metres (sq m)
Average annual rainfall in Delhi: 611 millimetres (mm)
Total volume of rainwater harvested: 7,867 cubic metres (m
3 ) 78,67,000 litres
Therefore, 26 per cent of total rooftop and surface runoff
is being harvested.
RAINWATER AVAILABLE FOR HARVESTING
Total rooftop and surface area: 31,363 square metres (sq m)
Average annual rainfall in Delhi: 611 millimetres (mm)
Total volume of rainwater harvested: 7,867 cubic metres (m
3 ) 78,67,000 litres Therefore, 26 per cent of total rooftop
and surface runoff is being harvested.
WATER SUPPLY SOURCE
Two privately owned bore wells in the campus, coupled with
MCD supply. On an
average 25,000 litres of water is consumed daily for potable
and non-potable
purposes.
RAINWATER HARVESTING SYSTEM
Rooftop rainwater harvesting: Rooftop rainwater from all buildings
in the
Embassy directly flows to the ground as these have sloping
roofs. The rainwater flowing in a network of storm water drains
is intercepted at strategic locations and diverted into recharge
wells that are located near officers' quarters, entrance gate
and near the Ambassador's bungalow. The recharge wells are
2 m x 2 m x 2 m in size and are provided with a recharge bore
of 150 mm diameter and 15 m depth to facilitate recharge.
Layers of boulders, pebbles and coarse sand in the recharge
will ensure efficient filtration.
The rainwater from staff residence and officers' quarters
flowing in
drains is used for recharge through percolation pits. The
pits are
0.7 m x 0.7 m x 1 m in size and are provided with recharge
bores of 150 mm dia and 12 m depth. The pits are also filled
up with layers of pebbles
Surface runoff harvesting:
The surface runoff behind the Ambassador's residence is captured
in a recharge well by means of a trench, filled up with pebbles
to arrest the silt and other suspended particles. The recharge
well is 2 m x2 mx2 m in size and provided with a recharge
bore of 150 mm dia and 15 m depth to facilitate recharge.
Dry well recharging: The rooftop rainwater and surface runoff
generated near the Chancery building is flown into storm drains.
This water is diverted into
desilting chamber of size 2 m x 2 m x 2 m. The suspended particles
settle here because the velocity of water is checked. The
filtered water is finally diverted into a dried open well
near the entrance gate.
Implementation of this project was completed in June 2004,
and the groundwater level as in January 2005 was 18.8 m below
ground level (bgl).
Cost of the rainwater harvesting system: Rs 1.10 lakh
For Details:
Sonam Yangchen
Head of chancery
Royal Bhutanese Ambessy
Chandra Gupta Marg, Chanakyapuri
New Delhi
Phone-26889806/07,26889230
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