wednesday, July 20, 2011
While The City Risks Flooding Every Time Is A Down, The Rainwater Which Could Have Been Utilized For Recharging The Groundwater Instead Goes Waste In The Absence Of A Proper Sewage Disposal Mechanism
Until the city has a proper system in place to dispose of sewage water, officials reveal, the MCG’s plan to construct 130 pits for rainwater harvesting will remain a distant dream.
At present, sewage water and rainwater get collected in the same drains and precious water goes waste.
Officials said that while the city gets flooded every time there is a downpour, the rainwater which could have been utilized for recharging the ground water, instead gets wasted in the absence of a proper sewage disposal system.
Y K Garg, Superintending engineer, MCG said, “currently, overflowing sewage water gets mixed with the rainwater. When this contaminated water penetrates the earth, it pollutes the groundwater too. So, till such time that the city gets a functional sewage treatment plant or a proper sewage disposal system, there is no scope for rainwater harvesting in the city.”
“At present there are 35 functional rainwater harvesting systems within the MCG limit and there is a plan to in
Ban Regeneration of Gurgaon (SURGE), has installed 75 units across the city, two of which are under construction.
“there is no policy, on planning and no proper town planning in place in the city which has resulted in the haphazard growth of the town,” said Darshan Singh, convener for water harvesting and vice-chairman of SURGE.
Gurgaon’s water table has been declining at the rat of about 2 meters (six feet) every year since 2006 and if the scientists of Central Ground Water Authority are to be believed, the Millennium city will be left with no water by 2017. At present, the NGOs, RWAs and civic bdies are making efforts to get the rainwater harvesting system installed at various locations. Residents too feel that the rainwater harvesting systems are just eyewash as more care needs to be taken in order to augment the groundwater level.
“We have been contacting the civic bodies to take proper measure and have a team in place to look after the technical aspects of this entire process. Otherwise, there is no point in installing rainwater harvesting pits when the sewerage system in itself is not in place,”
According to estimates, the present populations of Gurgaon is over 20 lakh and the total water requirement is around 70MGD (millon gallons per day). This means that with the present supply of 45MGD of water through canals and 10-15 MGD water through tubewells, the city is facinig a minimum of 15MGD water shortage each day. A simple solution to meet the water shortage and improve the quality of groundwater lies in rainwater harvesting.
1. Recharge pit
Dig a deep pit. After excavation fill the pit with pebbles and boulders. Direct the rainwater collected at roof and other sources to this recharge pit. Make sure that water is silt free and clean the pit regularly
2. Gravity Head Recharge well
Roof top rainwater is channelized to a well and it recharges due to gravity. It is suitable where land availability is limited and land pit is overlaid by impermeable soil. Though a bit expensive, this method recharges water quickly & effectivel
3. Abandoned well
This is by far the most popular method and yields good results. A dry or unused well is used as recharge structure. The recharge water is guided through a pipe to the bottom of well to avoid scouring of bottom. Take care to clean the well before making it a recharge structure. Add chlorine to well-water
4. Abandoned/ Running Hand Pump
Same as abandoned well method (3), a running of abandoned hand pump is used instead of a well. It is suitable for smaller buildings of roof area up to 150 sq m. very cost effective method and water can be used for household purposes
Distribution of water on Earth
Of the total water on earth, only 3% constitutes fresh water, which is of usable quality. Rest is saline water lying in oceans 97% (1.230mil, cu kms) in oceans
3% (37.5) mil cu kms) freshwater of this 30% of freshwater only 23% is available to us as 77% of it is locked in glaciers and ice caps
1% lakes, rivers
11% groundwater <800m
77% glaciers, ice caps
Benefits of Rain Water Harvesting
• Quality of groundwater improves
•Raises the level of groundwater
•Most cost-effective solution to meet water crisis
•Decreases water logging
Illegal borewell in sushant loki sesaled Gurgaon:
An illegal borewell was sealed on Monday in Block C, Sushant Lok I, after the local residents and the maintenance agency approached the district administration to complain against the activity. Residents alleged that as more and more water is getting wasted, borewells should not be dug illegally in the colonies as they eat into the water supply.
The increasing wastage of water in the residential colonies has raised serious concerns amongst the RWAs and the residents who are now approaching the district administration to keep tabs on the water use.
The upscale private colonies as well. Environmentalists of Gurgaon have also raised concerns about the wastage of water in the city and the digging up of illegal borewells in residential colonies.
Environmentalist Ramesh Bhagasra said, “The privately developed colonies get water for only two hours every day. People are pumping out ground water throughout the year and the civic bodies are talking about the rainwater harvesting units for recharging the groundwater level. The only way to increase the groundwater level is to have artificial lakes and ponds in the city that would augment the ground water level,” Talking about the sealed