A STUDY ON GROUNDWATER LEVEL IN THE SELECTED WELLS IN CHITTAGONG CITY
Presented by
Linkon Bhattacharjee MD.Misbah Uddin
Mahin ID: 0901024 ID: 0901079
Supervised by
Dr. Aysha Akter Associate Professor
Department of Civil Engineering
Chittagong University of Engineering & Technology
BACKGROUND
Chittagong is the second largest city of Bangladesh, having around 157
km2 inhabited by 4.2 million people. Chittagong WASA is responsible for
water supply to one third of city dwellers and rest of people depends on
the shallow tube well and deep tube well.
Being the industrial capital of Bangladesh, paved area and withdrwal of
ground water in Chittagong is increasing day by day reducing infiltration
as well as natural recharge system. Thus ground water lowering has been
causing problem drawing our attention in to the project.
AIM AND OBJECTIVE
To determine the variation of ground water table in Chittagong city. The sub objectives are:
• To develop statistical relationship between yield and water depth using trend analysis; and
• To prepare a predictive map using kriging interpolation under GIS environment
METHODOLOGY Literature study
Investigation of location of tube wells in Chittagong City
Data collection from CWASA
Showing the variation of water level using Kriging method under GIS
Calculation of water table lowering
Result analysis and future recommendation
Available Information (CWASA,2014)
Halisohor-2
Halisohor-1
Dulalabad
Rongipara
Uttora
Fire S
ervice
Kornofully R/A
Agrabad
-1
Agrabad
-2
Agrabad
-3
CGS Colony
MOD-1
Bohutola
Jublee Road
Sadarg
hat
Love lan
e
Collegia
te
Firozsh
ah-1
firozsh
ah-3
Goalpara
policelin
e
Ice Fa
ctory
Bakolia
koibollo
dham
Hazicam
pFu
lcoli
Syedsh
ah0
5000
10000150002000025000
300003500040000
200920102011
Pum
ped
out w
ater
(gal
/hr)
Halisohor-2
Halisohor-1
Dulalabad
Rongipara
Uttora
Fire s
ervice
Karnofully
Agrabad
-1
Agrabad
-2
Agrabad
-3 CGS
MOD-1
Bahutola
Jublee Road
sadarg
hat
Love lan
e
Collegiat
e
Firozsh
ah-1
Firozsh
ah-3
Gowalpara
Policelin
e
Ice Fa
ctory
Jelaka
ragar
Koibollodham
Hazicam
p
Basundhora
Hajiprar
a
Syedsh
ahFu
lkoli
0102030405060708090
100
20112013
Wat
er Le
vel (
m)
KRIGING METHOD
STUDIED TUBEWELLSThe study area lies between 22°18'0 ″ to 22°24'0 ″ N latitude and 91° 46'0 ″
to 91° 51'0 ″ E longitude.
WATER TABLE VARIATION IN FIVE DIFFERENT WELLS (CWASA,2014)
In figure the groundwater level exhibits slow declining trend in five different locations which is within 14m range except in FIDC industrial area.
ANALYSIS PROCEDURE• For analyzing the average depth to water level and its variability in the
study area, the water level data of 2 years (2011 and 2013) recorded at CWASA was collected. The water level fluctuation was analyzed for year 2009 to 2013.
• Curve fitting using the regression equation y=mx+c was done for the required places to fill in for the missing data.
• The groundwater data and the discharge data assembled on yearly basis were analyzed for their long - term pattern, and were interpreted graphically to understand the dynamics of the groundwater level and discharge.
• The results were used to make the spatial variation maps of average depth to water level and water level fluctuation from the groundwater data.
• From analysis it is seen that discharge rate is decreasing year by year and hence water level is increasing.
RELATION BETWEEN DISCHARGE AND WATER TABLE
Thus discharge and water table are inversely proportional
GROUNDWATER LEVEL IN 2009• The minimum groundwater level was 4.88 m and the maximum
groundwater level was 84.76 m in 2009.• The average groundwater level in 2009 was found 43.83 m.
GROUNDWATER LEVEL IN 2010• The minimum groundwater level was 7.47 m and the maximum
groundwater level was 84.91 m in 2010.
• The average groundwater level in 2010 was found 47.06 m.
GROUNDWATER LEVEL IN 2011• The minimum groundwater level was 10.06 m and the maximum
groundwater level was 85.06 m in 2011.• The average groundwater level in 2011 was found 50.29 m.
GROUNDWATER LEVEL IN 2012• The minimum groundwater level was 12.65 m and the maximum
groundwater level was 86.72 m in 2012.• The average groundwater level in 2012 was found 53.54 m.
GROUNDWATER LEVEL IN 2013• The minimum groundwater level was 15.24 m and the maximum
groundwater level was 92.26 m in 2013.• The average groundwater level in 2013 was found 56.74 m.
VARIATION IN WATER TABLE FROM 2009 TO 2013
GROUND WATER LOWERING RATE It has seen that water level lowering rate is 0.122 to 7.922 m/year in
the studied wells.
Halisohor-2
Halisohor-1
Dulalabad
Rongipara
Uttora
Fire S
ervice
Agrabad
-1
Agrabad
-2
Agrabad
-3
CGS Colony
MOD-1
Bohutola
Jublee Road
Sadarg
hat
Love lan
e
Collegiat
e
Firozsh
ah-1
firozsh
ah-3
Goalpara
policelin
e
Ice Fa
ctory
koibollo
dham
Hazicam
pFu
lcoli
Syedshah
0
2
4
6
8
10Water table decline rate (m/year)
Decli
ne ra
te (m
/yea
r)
Halisohor-2
Halisohor-1
Dulalabad
Rongipara
Uttora
Fire s
ervice
Karnofully
Agrabad
-1
Agrabad
-2
Agrabad
-3 CGS
MOD-1
Bahutola
Jublee Road
sadarg
hat
Love lan
e
Collegiat
e
Firozsh
ah-1
Firozsh
ah-3
Gowalpara
Policelin
e
Ice Fa
ctory
Jelaka
ragar
Koibollodham
Hazicam
p
Basundhora
Hajiprar
a
Syedsh
ahFu
lkoli
0102030405060708090
100 Water level of five years
20092010201120122013W
ater
Leve
l (m
)
RECOMMENDATIONS
• The groundwater table monitoring should be done regularly for
assessment of annual safe yield.
• Large scale groundwater withdrawal by tube wells should be limited
during dry period up to safe yield limits.
• An alternative pump can be installed for drinking water supply in
the areas where water is highly abstracted.
Thank You