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International Journal of Engineering and Techniques - Volume 4 Issue 2, Mar-Apr 2018
ISSN: 2395-1303 http://www.ijetjournal.org Page 578
Identification of Groundwater Potential Zone in
Rural Sub-watershed using RS and GIS Velayudha Das M
1 and Poongothai S
2
Research Scholar1 and Professor
2
Department of Civil Engineering, Annamalai University, Annamalainagar-608002
I. INTRODUCTION
Groundwater is a significant hidden popular natural resource of
water in many tropical countries [1]. Due to uneven distribution
of rainfall, the surface water resources are unevenly distributed
as well as increasing intensities of irrigation from surface water
resulted in increased emphasis on the development of ground
water resources, while the surface water is inadequate to meet
the demand for various purposes; groundwater is the only
alternate resource which will serve the purpose [2]. In hard rock
semi-arid terrain that occupies two third of India about 65% of
the country [3] groundwater is the largest fresh-water resource
and its use raised from 10-20 km3 for every prior year 1950 to
240-260 km3 by 2000 [4]. As a result, the groundwater potential
varies from place to place, sometimes within a few meters and
even within the same geological formation [5]. In the absence of
any planned groundwater withdrawal approach, many times
random drilling of bore wells results in failure. Further, this
indiscriminate exploitation has led to decrease in groundwater
potential, lowering of water level and deterioration in
groundwater quality. It is therefore necessary to develop a
sustainable groundwater management scheme to properly utilize
this vital resource, which in turn requires delineation of
groundwater potential zones. There are several methods such as
geological, hydro-geological, geophysical, remote sensing
techniques, etc., which are employed to delineate groundwater
potential zones. Remote sensing technique provides an
advantage of having access to large coverage, even in
inaccessible areas. Satellite pictures are widely being used for
groundwater exploration because of its ability to identify various
ground features, which may serve as an indicator of
groundwater’s presence. Geographical information system (GIS)
has become one of the leading tools in the field of groundwater
research, which helps in assessing, monitoring, and conserving
groundwater resources. Geology, geomorphology, lineaments,
soil, land use, drainage and slope all play an important role in
groundwater location [6]. Many researchers have come out with
procedures and techniques of generating the groundwater
potential zone maps by remote sensing, which helps in
surveying, checking, and rationing groundwater assets based on
groundwater controlling parameters using GIS [7-15]. The scope
of the study is to develop an action plan for the effective usage
of groundwater resource for agricultural and non agricultural
activities. The objective of this study is to identify groundwater
RESEARCH ARTICLE OPEN ACCESS
Abstract: Groundwater is a dynamic and replenishment in natural resources, which support all environmental issues.
To understand groundwater prospects of an area, integration of different thematic layers is required. An attempt was
made to identify groundwater potential zones in the Muktha river (upper Manimuktha) sub-watershed (4C1A2e) of
Tamilnadu, India for effective usage of groundwater resource for agricultural and non-agricultural activities and for
sustainable groundwater management. Toposheet maps of SOI and IRS 1C satellite imageries are used for preparing
various thematic maps viz. geology, geomorphology, slope, land use/cover, lineament density, drainage density, soil
map, hydrologic soil groups and runoff. After transforming these thematic layers to raster format, assigned ranks and
weightage to the factors according to their influence of groundwater recharge. Based on the groundwater availability
a composite groundwater potential map has been generated as high, moderate, less and poor zones of covering
10.86%, 37.93%, 35.11% and 16.10% in the study area respectively. Agricultural oriented artificial groundwater
recharging methods are recommended to develop the poor and the less groundwater potential zones.
Keywords — Sub-watershed, Groundwater, Weighted overlay, Thematic maps, RS, GIS.
International Journal of Engineering
ISSN: 2395-1303
potential zones in the hard rock’s area of the Muktha river sub
watershed in Tamilnadu.
II. STUDY AREA
The present study area is Muktha river sub-
Manimuktha, 4CIA2e) of the Velar basin (Fig.1). It is a part of
Sankarapuram and Kallakurichi taluks of Villupuram district in
Tamilnadu, India. The study area extends between 78
78° 59’ 21.73” E and 11° 46’ 12.80’’- 11° 53’ 42.38’’ N with an
area of 251.151 km2. This rural sub-watershed falls in SOI
toposheets 58I/9 and 58I/13. The western part of the study area
is covered by a thick forest cover (85.761 km
almost plain terrain (165.390 km2). The Muktha river originates
in the western side of the Eastern Ghats hill range (Kalrayan
hill) and join in the Manimuktha dam. It is an ephemeral river
which is found almost to be dry throughout the year, excepting
the surface water flow for a few days in a year during rainy
season. Agriculture is the main economical activity of about
80% of the population. The main sources of water are tanks and
dug wells apart from rainfall. The average annual rainfall of the
study area is 1231.09mm during 1992-2017. The elevation
ranges from 130m to 987m above MSL with a gentle gradient
from west to east. The soil types are clay soil, red soil, alluvial
soil and red gravelly soil. A major part of the study area falls in
the agricultural activities, where sugarcane, paddy, and
groundnut are being cultivated and depends on groundwater for
their use. The area is mainly underlain by charnockite
depth of bore holes in the upper ranges of Manimuktha basin is
90-150 ft [16]. The depth of dug wells and the
15-20 m and 8-18 m respectively [17]. R
coupled with increase in groundwater exploitation results
declining of groundwater levels.
Fig.1 Index map of the study area
International Journal of Engineering and Techniques - Volume 4 Issue 2, Mar
1303 http://www.ijetjournal.org
potential zones in the hard rock’s area of the Muktha river sub-
-watershed (upper
, 4CIA2e) of the Velar basin (Fig.1). It is a part of
Sankarapuram and Kallakurichi taluks of Villupuram district in
Tamilnadu, India. The study area extends between 78°43’9.22’’-
53’ 42.38’’ N with an
watershed falls in SOI
toposheets 58I/9 and 58I/13. The western part of the study area
is covered by a thick forest cover (85.761 km2) and the rest is
). The Muktha river originates
de of the Eastern Ghats hill range (Kalrayan
hill) and join in the Manimuktha dam. It is an ephemeral river
which is found almost to be dry throughout the year, excepting
in a year during rainy
he main economical activity of about
The main sources of water are tanks and
dug wells apart from rainfall. The average annual rainfall of the
2017. The elevation
with a gentle gradient
from west to east. The soil types are clay soil, red soil, alluvial
A major part of the study area falls in
the agricultural activities, where sugarcane, paddy, and
nds on groundwater for
rnockite rock. The
depth of bore holes in the upper ranges of Manimuktha basin is
the water table range
Recurring drought
coupled with increase in groundwater exploitation results in
III. METHODOLOGY
A) Watershed Database:
In this study the following data are used (Fig.2)
• Base map of the study area (sub
SOI toposheets 58I/9 and 58I/13 (Source: IRS, Anna
University, Chennai).
• Remote sensing data (IRS 1C, LISS III) to study the land
use map of the year 2012 (Source: IRS, Anna University,
Chennai)
• Soil and Geology maps (Source: Geological Survey of
India)
• Hydrologic Soil Group and Runoff (Source: NRCS
method, Ministry of agriculture in India)
Various thematic maps (Geology, Geomorphology, Soil
Lineament, Land use/cover (LULC), Drainage, Slope, Runoff,
and Hydrologic Soil Group (HSG)) were converted into raster
format through GIS environment. The groundwater potential
zones were obtained by overlaying all these thematic maps in
terms of the weighted overlay method using the spatial analysis
tool in ArcGIS 10.5 software. During the weighted overlay
analysis, the ranking has been given for each individual
parameter and the weightage were assigned according to the
influence of the different parameters of each thematic map as
presented in the Table 1. It was validated throu
truthing.
Fig.2 Flow chart showing the methodology
B) Geology:
Occurrence of groundwater mainly depends by the underlined
rocks because the properties of porosity and permeability
variations by rocks to rocks. [18] pointed out that the type of
rock exposed to the surface significantly affects groundwater
recharge. A major portion of the study area is underlain by hard
rock (Archean group of rocks) of Charnockite and others are
Metaggabbro, Pyroxenite, Pyroxene granul
Hornblende-biotite gneiss (Fig.3).
Mar-Apr 2018
Page 579
In this study the following data are used (Fig.2)
study area (sub-watershed 4CIA2e) from
SOI toposheets 58I/9 and 58I/13 (Source: IRS, Anna
Remote sensing data (IRS 1C, LISS III) to study the land
use map of the year 2012 (Source: IRS, Anna University,
(Source: Geological Survey of
Hydrologic Soil Group and Runoff (Source: NRCS-CN
method, Ministry of agriculture in India)
Various thematic maps (Geology, Geomorphology, Soil,
, Land use/cover (LULC), Drainage, Slope, Runoff,
Soil Group (HSG)) were converted into raster
format through GIS environment. The groundwater potential
zones were obtained by overlaying all these thematic maps in
terms of the weighted overlay method using the spatial analysis
. During the weighted overlay
analysis, the ranking has been given for each individual
parameter and the weightage were assigned according to the
influence of the different parameters of each thematic map as
Table 1. It was validated through ground
Fig.2 Flow chart showing the methodology
Occurrence of groundwater mainly depends by the underlined
rocks because the properties of porosity and permeability
pointed out that the type of
rock exposed to the surface significantly affects groundwater
major portion of the study area is underlain by hard
rock (Archean group of rocks) of Charnockite and others are
Pyroxenite, Pyroxene granulite, Ultrabasic, and
International Journal of Engineering and Techniques - Volume 4 Issue 2, Mar-Apr 2018
ISSN: 2395-1303 http://www.ijetjournal.org Page 580
Fig.3 Geology map of the study area
Gneiss is a moderate recharge and potential of groundwater
source compare to Charnockite rock type. In the hard rock area,
groundwater occurrence mainly depends on secondary porosity
caused by fracturing of the underlying rocks [19, 20].
C) Geomorphology:
Geomorphology exhibits various landforms and structural
features. Geomorphologic units are extremely helpful for
selecting groundwater potential zones and artificial recharge
sites.The denudation land forms in the study area are subdivided
into various geomorphic units such as Dome type residual hills,
Linear ridge/dyke, Inselberg, Valley floor, Ridge type structural
hills, Upper piedmont slope, Shallow buried pediment and
weathered, Moderately weathered buried pediment, Pediplain
canal command and Water body mask (Fig 4).
Fig.4 Geomorphology map of the study area
The hydro-geomorphic units such as pediplain canal command,
valley floor, and buried pediment are good sources of
groundwater where as structural hills, pediment zone and gullied
land are poor recharge zones. Considering their behavior with
respect to groundwater control, the different classes are given
suitable values, according to their importance relative to other
classes are described in the Table1. The good groundwater
prospective zones are along the pediplain, and weathered zones.
The major portion of the study area falls under moderately
weathered and shallow buried pediment zones.
D) Soil:
Soil plays an important role in encouraging or discouraging the
recharge of groundwater, determining the quality parameters of
groundwater and direct impact on agricultural development.
Study area mainly underlined by Alfisols, Entisols, Hillsols,
Reserve Forest, Inceptisols, and Vertisols (Fig.5). Based on the
water holding capacity, Vertisols soil has more favor for
groundwater recharge and potential zone.
E) Hydrologic Soil Group: The initial infiltration and transmission of surface water into an
aquifer system is a function of soil type and its texture. From the
soil texture map, the hydrologic soil groups A (sand or gravel),
B (moderately coarse to fine, C (moderately fine to fine) and D
(clay) are identified in the study area (Fig. 6). Soil group A is a
high infiltration rate and good recharging zone, whereas D is
very low infiltration soil group. Field checks in the identified
soil units were conducted and confirmed.
Fig.5 Soil map of the study area
Fig.6 Hydrologic soil group map of the study area
International Journal of Engineering and Techniques - Volume 4 Issue 2, Mar-Apr 2018
ISSN: 2395-1303 http://www.ijetjournal.org Page 581
F) Drainage Density: Drainage pattern reflects the characteristic of surface as well as
subsurface hydrological formation.
Fig.7 Drainage density map of the study area
Most of the drainage originates from the charnockite hills in the
western part of the study area and the drainage pattern is
generally dendritic to sub-dendritic (Fig.7). The extraction and
analysis of the drainage network were prepared from
topographic maps, field data and satellite images [18].
Drainage density = LWS/AWS
where LWS = total length of streams in the sub-watershed and
AWS = area of the sub-watershed. Drainage density indicates
closeness of spacing of channels as well as the nature of surface
material. More the drainage density, higher would be runoff.
Hence, lesser the drainage density, the higher is the probability
of recharge or potential groundwater zone. So the higher weight
was given to the low drainage density regions.
G) Lineament Density:
Lineaments are formed due to the movement of the earth
intersects. It is considered as good occurrence of groundwater
potential zones. These are manifestation of linear features that
are identified from remote sensing data. The prominent
directions of these are NW– SE and NE–SW as shown in the
Fig.8.
Fig.8 Lineament density map of the study area
Those across in the high-drainage density and high-slope area or
in the area occupied by clay zones are of less significance as
there could be a high runoff along them and these may act as the
only conduit to transmit infiltrated rain water. In the hard rock
terrains, lineaments represent areas or zones of faulting and
fracturing resulting in increased secondary porosity and
permeability and are good indicators of groundwater [21,
22].The lineament density maps were prepared using the line
density tool in ArcGIS 10.5 software. Lineament-length density
is the total length of all recorded lineaments divided by the area
under study. Groundwater potential is high near lineament
intersection zones. Therefore, high lineament densities are more
favored for groundwater potential. The most significant value of
ranking was designated to highest lineament density interval.
H) Slope:
Slope determines the rate of infiltration and runoff of surface
water, the flat surface areas can hold and drain the water inside
Fig.9 Slope map of the study area
of the ground, which can increase the ground water recharge
whereas the steep slopes increase the runoff and erosion rate and
decrease the infiltration of surface water into the ground. The
hilly region indicates more runoff and no infiltration of
groundwater. The gradient of slope is one of the factors that
directly influence the infiltration of rainfall [23].The slope map
of the study area has been prepared by adopting the widely used
Wentworth’s average slope method. It varies from 0 to more
than 55%. Most of the study area occupies very flat terrain slope
category of 0-5%, except the upper part which is a hilly terrain
with slope more than 5%.The various slope classes and their
spatial distribution are shown in the Fig.9.The higher weight has
been assigned to gentle slope and lesser weight to higher slopes.
I) Land use/cover:
Land use/cover plays a significant role in the development of
groundwater resources. It controls many hydro-geological
processes in the water cycle. [24] estimated the difference in the
amount of groundwater recharge due to changes of land
International Journal of Engineering and Techniques - Volume 4 Issue 2, Mar-Apr 2018
ISSN: 2395-1303 http://www.ijetjournal.org Page 582
utilization and vegetation from changes in the groundwater
level..
Fig.10 Land use/cover map of the study area
Different land use/cover classes (Fig.10) were weighted based
on their water requirement. The water bodies were given the
highest weight. Agriculture fields had more ground water
potential zones because of regular irrigation and infiltration
consequently they have also given a higher rank. The current
fallow land is a land which was periodically left idle. Scrub land
is a land that is covered with small bushes and tree. The lowest
priority was given to scrub and waste lands as it lacks a
vegetation cover. Evergreen forest was weighted higher than
deciduous forest.
J) Runoff:
The non-dimensional Curve Number (CN,1-100) is derived
from the tables, chapter 7, SCS handbook, section 4 (1972) for
catchment characteristics, such as soil type, land use, hydrologic
condition, and antecedent soil moisture conditions (AMC).
Curve Number map of the micro-watersheds in the study area
was made by integrating HSG and LULC maps by using
ArcGIS 10.5 software [25]. The weighted CN for AMC II
condition of the micro-watersheds ranged from 59 to 89 (Fig.11
and 12).
Fig.11 Micro-watersheds wise Curve Number map of the study area
Fig.12 Runoff potential zone map of the study area
A high curve number means high runoff and low infiltration,
whereas a low curve number means little runoff and high
infiltration.
IV. RESULTS AND DISCUSSION
All the thematic maps were converted into raster format and
superimposed by weighted overlay analysis method and
integration of them through GIS environment (Table 1).
Geology + Geomorphology + Soil + Hydrological soil group+
Drainage density+Lineament density+ Slope+ Land use/cover+
Runoff = Groundwater Potential
Based on the groundwater potentiality, all thematic layers were
quantitatively and qualitatively placed together and categorized
into high, moderate, less and poor. This high weight value
means that the factor significantly influences the groundwater
recharge and potential. Thus, the entire study area was divided
into four groundwater potential zones (Table 2 and Fig.13). The
study reveals that high potential zones cover an area of 27.271
km2 (10.86%) of the study area. The high groundwater potential
zones are found in plain areas due to the presence of highly
fractured and weathered rocks. Moderate potential zones occupy
95.256 km2 (37.93%) of the study area which are mostly in the
plain region. Less potential zones spread over an area of 88.172
km2 (35.11%) and fall in the hilly and plain regions. Poor
groundwater potential zones are confined to mostly hilly terrain
which acts as high runoff zone. It occupies an area of 40.452
km2 (16.10 %) of the study area. The poor prospective zones fall
under denuded hills and the region where more withdrawal of
groundwater takes place for agricultural purposes. It shows that
high potential zones occur within very low drainage density. So
the proper prediction is needed to maximize infiltration and
obstruction of water for groundwater recharge.
International Journal of Engineering and Techniques - Volume 4 Issue 2, Mar-Apr 2018
ISSN: 2395-1303 http://www.ijetjournal.org Page 583
Fig.13 Groundwater Potential Zone map of the study area
Table 1 Rank and weightage of different parameters for groundwater potential zones
Criteria Classes Weightage Rank Groundwater Prospects
Geology
Charnockite, Metaggabbro, Pyroxenite,
Pyroxene granulite 18
1 Poor
Ultrabasic rocks 2 Less
Hornblende-biotite gneiss 3 Moderate
Geomorphology
Residual hills, Linear ridge, Inselberg, Valley
floor, Structural hills, Upper piedmont slope
13
1 Poor
Shallow buried pediment, weathered 2 Less
Moderate buried pediment, weathered 3 Moderate
Water body mask, Pediplain canal command 4 High
Soil
Hill soils
12
1 Poor
Inceptisols, Reserve Forest 2 Less
Alfisols, Entisols 3 Moderate
Vertisols 4 High
Hydrologic Soil Group
A
7
4 High
B 3 Moderate
C 2 Less
D 1 Poor
Drainage density
6.60-8.80
8
1 Poor
4.40-6.60 2 Less
2.20-4.40 3 Moderate
0.00-2.20 4 High
Lineament density
0.00-0.96
10
1 Poor
0.96-1.92 2 Less
1.92-2.88 3 Moderate
2.88-3.84 4 High
Slope in %
>15
14
1 Poor
10-15 2 Less
5-10 3 Moderate
0-5 4 High
Land use/cover
Scrub, Waste, Barren lands
8
1 Poor
Deciduous forest, Tree clad area 2 Less
Plantation, Fallow lands 3 Moderate
Water bodies, Agricultural lands 4 High
Runoff
<66 Poor runoff
10
4 High
66-70 Less runoff 3 Moderate
71-75 Moderate runoff 2 Less
>75 High runoff 1 Poor
. Table 2 Spatial Distribution of Groundwater Potential Zone
International Journal of Engineering and Techniques - Volume 4 Issue 2, Mar-Apr 2018
ISSN: 2395-1303 http://www.ijetjournal.org Page 584
V. CONCLUSION
The study area falls in four groundwater potential zones
ranging from poor to high. In order to maintain the water
table condition in balance, and to restrict the surface
runoff going waste, various measures for artificial
groundwater recharge can be implemented in such zones.
Percolation pits, recharge basin, recharge wells, ridges
and furrows, check dams, gully control/stone wall
structures, contour bund, trenching and land flooding are
some of the agricultural oriented artificial
groundwater recharging methods, are recommended in
poor and less groundwater potential zones of the sub-
watershed after conducting proper hydro-geological
investigations and site suitability analysis. It is
recommended that it is necessary to harvest the rainfall
during monsoon season. The groundwater potential zone
map could be used for various purposes like irrigation,
drinking and to plan for sustainable groundwater
management, etc. It is concluded that the RS and GIS
techniques are very efficient and useful for the
identification of groundwater potential zones.
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