The encroachments in and on the banks of River Noyyal, Ponds and Canals to be removed. All Water bodies must be desilted, and sewage flow must be prevented.
River Noyyal was once a perennial river with 34 live streams feeding the river. At present only 4 streams - Nandangarai, Masa Orambu, Mundanthurai, Iruttupallam are still connected with river Noyyal. And all other streams/ channels are either encroached or used for agricultural purposes or silted up and have become cart tracks. In order to assess the exact volume of water flow during the rainy seasons, a Topographical Survey and Revenue Survey has to be carried out, for identifying, studying and mapping of the streams connecting to River Noyyal.
District Administration has to be requested to remove the encroachments after the survey is carried out and rejuvenation of all the streams has to be done if the River Noyyal has to be restored.
During the year 2004-2005, it was estimated that about 600 RWHS are required for the area of 105 sq kms of Coimbatore City. So far 365 nos of Rain Water Harvesting Structures have been constructed in and around Coimbatore from the period of 2004 to 2011 for harvesting rain water stagnating on roads and open spaces of the city.
Now the city has expanded to 255 sq kms area for which more than 2000 RWHs are needed. Construction of such structures will harvest all the rain water stagnating on the roads and in open spaces and causing traffic congestion during the rainy season. Periodical cleaning of the RWHs is very essential if they have to be effectively functional.
Noyyal River Basin has 23 Anicuts, and 31 Tanks. 9 tanks are located within the city limits. These tanks are highly polluted due to the letting of sewage water into them. As a result, the groundwater has become heavily contaminated.
Since desilting has not taken place for many decades in these tanks, the storage capacity of the tanks has diminished significantly. Hence immediate action has to be taken for rejuvenating the tanks and preventing inflow of domestic and industrial effluents into them. All the water bodies located in the city will have to be protected with compound walls after eviction of encroachments and effective measures to be taken for preventing pollutants from entering the tanks.
Prolific growth of water hyacinth due to the presence of sewage in the water also consumes whatever little rain water that gets collected in the tanks.