Rain Water Harvesting
The Rain Water Harvesting movement launched in 2001 was the brainchild of the Honourable Chief Minister. It has had a tremendous impact in recharging the groundwater table all over Tamil Nadu. Amendments made to Section 215 (a) of the Tamil Nadu District Municipalities Act, 1920 and Building Rules 1973, have made it mandatory to provide RWH structures in all new buildings. To consolidate the gains, various measures have been taken up for rejuvenation of RWH structures created already in both public and private buildings, besides creating new ones. IEC activities will be continued in the Town Panchayats to sensitize all the stake holders to sustain the momentum. During 2011-12, in order to give a fillip to this laudable programme, the Town Panchayats have undertaken the construction of new RWH structures and renovation of old RWH structures. IEC activities are being carried out in Town Panchayat areas to sustain the momentum of the programme.
There are 1821 water bodies maintained by Town Panchayats with an extent of 6286.84 acres. In order to restore the 243 water bodies Rs. 55.52 crore has been allocated for the years 2011-12 and 2012-2013 under IUDM and NABARD. Similarly, during 2013-2014, 561 improvement works such as desilting and strengthening of bund and sluice works have been taken up at a cost of Rs.18.40 crore under General fund. Proposed to taken up 88 water body improvement works in 68 Town Panchayats at an estimated cost of Rs.28.15 crore.
Total number of buildings in Town Panchayats is 23,92,457 out of which 22,94,342 buildings are provided with Rain Water Harvesting facilities as mentioned in the following table.
Action Plan for IEC Activities
· Vigorous IEC campaign would also be adopted to bring awareness among the public
· Conduction of awareness programme with the coordination of Self Help Groups, Welfare Associations, NGO s and school children.
· Erection of hoardings displaying the importance and benefits of the Rain Water Harvesting.
· Door to Door campaign on Rain water Harvesting with the participation of SHGs, NGOs.
Action plan for harvesting campus rain water
· Provision of rain water harvesting structures would also been monitored under Section 215 A of the Tamil Nadu District Municipalities Act, while giving plan approval.
· Rain Water Harvesting Structures have already been provided in respect of buildings, belongs to Town Panchayats Department.
· Necessary action taken to provide adequate Rain Water Harvesting structures belongs to other Government department.
· Now, in order to make use of the forthcoming North East monsoon, the Executive Officers of Town Panchayats have been instructed to take necessary action to rejuvenate existing Rain Water Harvesting structures.
Rain Water Harvesting structures in Ooranies
Rain Water Harvesting structures in Water Supply sources
Rain Water Harvesting structures in Government Buildings
Awareness programme on Rain Water Harvesting - Student rallies
Awareness programme on Rain Water Harvesting - Workshop/Street Drama
Erection of hoardings displaying the importance and benefits of the Rain Water Harvesting
Door to Door campaign on Rain water Harvesting
Rain water Harvesting Banners / Stickers
RAIN WATER HARVESTING TECHNIQUES :
There are two main techniques of rain water harvestings.
The storage of rain water on surface is a traditional techniques and structures used were underground tanks, ponds, check dams, weirs etc. Recharge to ground water is a new concept of rain water harvesting and the structures generally used are :-
DIVERSION OF RUN OFF INTO EXISTING SURFACE WATER BODIES
Construction activity in and around the city is resulting in the drying up of water bodies and reclamation of these tanks for conversion into plots for houses.
Free flow of storm run off into these tanks and water bodies must be ensured. The storm run off may be diverted into the nearest tanks or depression, which will create additional recharge.
Urbanisation effects on Groundwater Hydrology :
Methods of artificial recharge in urban areas :
Benefits of Artificial Recharge in Urban Areas :