Kolkata: The State Mission for Clean Ganga (SMCG) will conduct a drone-based survey to identify and map all outfalls and drains.
This covers a stretch of about 120 km along both sides of the Hooghly from Kalyani in Nadia to Diamond Harbour in South 24 Parganas for pollution abatement work.
SMCG will conduct this for the first time with the technical assistance of the Kolkata Metropolitan Development Authority.
The objective of the survey will be to ensure that no drain discharging wastewater into the Hooghly River remains untreated.
This exercise will facilitate the preparation of wastewater treatment projects in the future.
It will also help explore the feasibility of tapping identified drains with existing sewage treatment plants.
The survey will be carried out using advanced drone survey techniques. About 100 m of width along both riverbanks (80 m terrestrial and 20 m aquatic area) will be covered under the survey.
SMCG will engage an agency that will identify all outfall drains discharging into the Hooghly, along with their latitude, longitude and cross-sectional dimensions, with the help of the drone survey.
The identified drains will be superimposed with the drains already identified by the Central Pollution Control Board (CPCB), as well as additional drains not covered by the CPCB.
KMDA will provide a list of approximately 400 drains, which will be superimposed with the outfalls identified through the drone survey.
Once a detailed mapping of the drainage outlets is done, SMCG would be able to draw plans for the effective reuse of treated wastewater generated from the sewage treatment plants.
Waste water is also falling into the Hooghly River. Plans could be drawn for effectively using wastewater for pisciculture, gardening or road washing.
KMDA is periodically working on setting up new sewerage treatment plants in riverside areas. The plan is to fully prevent any sewerage or drainage water from falling into the river.
SMCG also plans to prepare a master plan for pollution abatement in the Ganga and its tributary basin in the Kolkata Metropolitan Area for the projected population in 2042.
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