Upto date list of veries (dykes) holdings. Now there are various kinds of dyke ownership (1) private owner (2) fishermen co-operative (3) governmental holding (4) private owners co- operative (5) vested. Under the guidance of dr. Dhrubajyoti Ghosh (IWMED)made this comprehensive list of dykes. Possesers, no. of fishermen families and other details (1988).
(1988) Govt of West Bengal, Govt. of Indian, Asian Institute of Technology, World Bank, FAO, GT2 sponsored a UNEP conference at Calcutta particularly on East Calcutta bio-sphere. and waste water agriculture.
After Ramsar conference, the issue of East Calcutta biosphere once again draws the attention of world environmental scenario. Clear verdict of 1988 Calcutta UNEP conference was to make a conservation strategy of East Calcutta biosphere immidiately.
Street side garbage dumping is a common hazard in Calcutta - astonisingly city authority is enhancing this practice. Naturally with the load of 6000 tons daily garbage. Calcutta is really breathing stertorously.
Last year World Bank has provided rs.500 crores for city garbage management-this gives a permanent settlement of street side garbage dumping instead of make shift dumping point
Once seawater used to come inside through Matta Piyali at the uptide time. But the siltation caused by city sewage-cut off the sea water passage. Now these rivers are officially announced dead
Incoming city waste water is of about 170-200 BOD unit and ODO unit. This kind of highly polluted water carries-various heavy metal, oil & grease like materials apart from other pollutants.
After crossing two small ponds waste water passes through a bed of water hyacinth-this a 1200 ft. Long hyacinth bed. Sewage water of about 200 BOD unit-bring down to about 80 BOD unit.
Root system of hyacinth grasps most of the material ingredients, heavy metals, oil and grease like materials-make the water almost free from particle pollutants