assessment of fresh water availability and demand in the...
TRANSCRIPT
Assessment of Fresh Water Availability and Demand in the
Sundarban Biosphere Area of Indian Bengal Delta
Freshwater is a scarce resource in the Sundarban Biosphere Reserve
(SBR) area (19 blocks) of Indian Bengal Delta though it is
traversed by numerous creeks and rivulets and receives a huge
amount of precipitation during monsoon.
Most of the rivers have lost their connections with their parent river.
The rivers are mostly saline in Sundarban. The groundwater is also
saline in shallow aquifers. Fresh groundwater is only available at a
depth of >250 metres (Sinha Ray, 2010).
Scarcity of upstream fresh water, high soil and water salinity, saline
ground water make it very difficult for the people to secure their
livelihood. The present paper identifies the water related problems
and assesses sectoral water demand and availability in SBR.
Annual Water Availability Available water from Deep
Tube Well (DTW) in Sundarban
is 8.08 mcm that is used to meet
the drinking water demand.
Over 70000 freshwater tanks
and around 8000 Shallow Tube
Wells (STW) are the major
sources of irrigation in
Sundarban.
The STWs have a potential to
supply 386.59mcm water during
Rabi and summer cultivation
whereas 43.02 mcm and 9.21
mcm water are available from
tanks and canals.Data Source: Govt. of W.B., 2010
CGWB (2007) Manual on Artificial Recharge of Ground Water, Govt. of India
CIFRI (1998) Annual Report, Central Inland Fisheries research Institution, Govt. of India
Govt. of India (2011) Population Census 2011, Primary Census Abstract, North & South 24 Parganas District, West Bengal
Govt. of W.B. (2010) District Statistical Handbook 2009-10 combined, South & North 24parganas. Bureau of Applied Economics & Statistics
Rudra, K. (2009) A State of Environment Report on “Water Resource and Its Quality in West Bengal”, West Bengal Pollution Control Board
Rudra, K. (2012) Atlas of Changing River Courses in West Bengal. Sea Explorers' Institute, Kolkata, p 132
Sinha Ray, S.P. (2010)Status of Ground Water Condition in Sundarban area, West Bengal. Commissioned report, WWF-India
Unavailability of fresh water
restricts food production which
endangers the food security of
87.5% of the people.
-50-250
5025
Excess/deficit water for Winter & Summer cultivation
-50-250
+50+25
Rainwater Harvesting Potential in Sundarban
• Rejuvenation/re-connection of disconnected river
• Large scale rainwater harvesting (closure dam)
• Roof-Top rain water harvesting (45mcm)
• Expansion of irrigation network
• Deepening of existing ponds
• Artificial recharge within shallow aquifer
• De-salinization of saline ground water.
Some of the major policy options to
meet the water demand in Sundarban
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References
Tuhin Bhadra and Sugata Hazra (School of Oceanographic Studies, Jadavpur University, Kolkata, India)
The annual drinking &
domestic water demand in
Sundarban blocks are 8.08 mcm
and 105.1 mcm.
The water requirement for the
Winter & Summer cultivation is
641.25 mcm, whereas 2141.58
mcm for Monsoon cultivation.
The water demand for
agriculture is highest in July (902
mcm) and lowest in April (1.22
mcm).
The total annual water demand
in the 19 blocks of Sundarban is
2895.92 mcm.
Annual Water Demand
Data Source: Govt. of India, 2011, Govt. of W.B., 2010, Rudra, K., 2009
Winter & SummerMonsoon
A B
Diamond Harbour
Canning
Gosaba
Basanti
Jotisrampur
NimpithMandir Bazar
Horizontal Scale
0 20 Km
Verticel Scale
0 300m
Saline
Fresh
Clay
Saline
Fresh
Clay
Clay
Saline Ground Water
05
10152025303540
Non-Monsoon Highest Monsoon Lowest
Seasonal changes in Salinity (ppt)
Data Source: CIFRI, 1998
So
urc
e: S
inh
aR
oy,
S.P
., 2
01
0
A B
Disconnected River Network
A B
River Network has been modified after, Rudra, K.,2012
Gosaba
Nimpith
Sundarban Biosphere
Reserve, India(9630 km2)
Reserve Forest (4263 km2) 30 Blocks
Transitional Zone (5367 km2)
19 Blocks
Core Area(1700 km2)
Buffer Area (2563 km2)
Location