Dhapa has been historically used for waste dumping for many decades. With the gradual development of the city towards the east, the garbage dumping has moved away further eastwards and the old dumping areas nearer to the main city are now used for farming.
The current “dumping area” is spread over about 35 hectares. It consists of two unlined dumpsites, spaced~ 500m apart – one closed dump of area ~ 12.14 ha and one active dump of area ~ 23 ha.
Establishment of a new and controlled landfill dump is planned in the area. Both the closed and the active dumpsite are unlined and without any environmental protection or mediation facilities. The closed dump site bearing of area of approximately 12.14 ha is the project site.
Scientificclosure & containment of Old MSW dump at Dhapa; Salt Lake Kolkata using Geosynthetics products.
Techgrid TGU 35 (PVA and PA coating); Geonet and Drainage composite.
Unlike any new landfill , management of existing waste would require a detailed study of various aspects including design of slopes to accommodate more waste in the provided foot print area; stability of base and embankment slopes ; ease of construction ; health & safety of workman etc.
In this case, embankment was constructed on weak foundation; there was possibility of uneven primary settlement. So, it was necessary to construct stable soil embankment, it was proposed to use Techgrid TGU Geogrid (PVA & Pa Coated) reinforcement &Geonet
Laying of Geogrid –
Jointing of Geogrid –
Connections to structure –
The closure and containment of old waste was achieved scientifically with the aid of Geosynthetics products to get final height of 35m; 10 m higher than old unscientifically disposal. Further the new facility would have managed waste in a more efficient way to save almost 1.5 ha of land. This is important achievement & would have been possible due to steeper construction of slope by using Geogrid and other geosynthetics material.
Project was successfully completed by the contractor as per requirement of contract document.Over a period of few months a lush green turf was being formed on the outer face the slope. There is no way to understand that underneath the expansive gardens lie the garbage hills of the city for years.
This project made into many news channels
Stinking Dhapa dump to turn tourist destination by 2020
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KMC converts Dhapa, largest open garbage dump-yard into a green plateau