This module gives an overview of general applications of current hydrogeological aspects. It is for the basic understanding of students and research scholars.
3. Studies & Approaches
• Surveys & Monitoring
• Data collection and Analysis
• Research and Development
• Procedure and Product
Development
• Resources evaluation and
Management
• Impact analysis (Natural &
Man-made)
• Future trend analysis.
6. Surface hydrology
• Addresses issues pertaining to eroding soils
and streams due to surface flow.
• Flooding, nutrient runoff, and pollutants are a
few of the effects addressed + civil
constructions such as dams.
7.
8.
9.
10. Hydrogeology
• Deals with the Occurrence, distribution and quality of
groundwater.
• The flow of water in the subsurface environment(aquifers) is
controlled by various factors
11. Branches of Hydrological Sciences:
• Hydrology – Surface water &
• GW hydrology
• Physical Hydrogeology
• Chemical Hydrogeology
• Contaminant Hydrogeology
• Coastal Hydrogeology
• Hydrometeorology
• Urban Hydrology
• Forest Hydrology
• Snow Hydrology
• Ecohydrology
• Isotope Hydrology
• Hydraulics
• Fluid dynamics
• Hydrodynamics
• Water Resources
Engineering
• Water management
• Water Conservation
• Natural hazard and
Disaster Management
• Storm Water
Management
12. Hydrometeorology:
• is the study of the transfer of water and
energy between land and water body surfaces
and the lower atmosphere.
• Hydrometeorology incorporates meteorology
to solve hydrological problems.
• These problems include forecasting flood or
drought, or determining water resources and
the safety of dams.
13. Surface Hydrology
• Measurement of Hydrometeorological data
– Rainfall, Runoff, Infiltration, Evapotranspiration, snowfall/
snowmelt,
• Catchment Zone characteristics
– Topography, Drainage, Morphometric parameters
– DEM, DTM.
– Rainfall-runoff relationships
– Flood forecast- peak flow analysis.
– Storage reservoirs, dams, weirs, etc.
– Drainage controls.
– Climatic Water Balance.
– River Basin Hydrological models.
19. HYDRAULIC PROPERTIES
• There are ten main hydraulic properties of the aquifer
which should be understood. These are:
• 1. Hydraulic Conductivity.
• 2. Transmissivity.
• 3. Storage Coefficient.
• 4. Specific Mass Storativity.
• 5. Specific Yield.
• 6. Specific Retention.
• 7. Hydraulic Resistance.
• 8. Leakage Coefficient.
• 9. Leakage Factor.
• 10. Drainage Factor.
20. Aquifer Types
• Confined aquifer
– Under pressure
– Bounded by impervious layers
• Unconfined aquifer
– Phreatic or water table
– Bounded by a water table
• Aquifer
– Store & transmit water
– Unconsolidated deposits sand and gravel,
sandstones etc.
• Aquitard
– Transmit don’t store water
– Shales and clay
21. Aquifer System Analysis
• Pumping Tests
• Well-Hydraulics
• Flow types, flow tests
• Aquifer parameter evaluation
• Specific capacity of wells
• Optimum Yield analysis of wells
• Well-fields
• Set back distances among wells(?)
22.
23.
24.
25. Development of Groundwater
Resources
• Response of aquifers for pumping
• Long-term and short-term changes
• Natural recharge detection
• Artificial recharge of Groundwater
• Aquifer modelling & Simulation
• Recharge-Discharge Simulation
26. Coastal Hydrogeology
• Saltwater-Freshwater Relations/interface
• Density variations
• Shape and slope of interface- Movement
• Island aquifer systems
• Saltwater intrusion (encroachment)
• Saltwater upconing
• Modelling saltwater-freshwater flow in coasts.
27. Scale of Hydrogeological Studies
• River basin
• Watershed( Macro-,Micro)
• District, Taluk, Block, Zonal
• State-wide
• Country-wide
• Formation level
• Single well, Well-fields
43. Surface water bodies –Krishna basin
• Surface water bodies have traditionally played an
important role in the lives of common people in
India.
• According to the assessment, the total utilizable
Surface Water Resource in Krishna Basin is 58.0
BCM. Reported Live Storage capability of Krishna
Basin is 49.55 BCM. Maximum number of surface
water bodies in Krishna basin falls in size range 0-
25 Ha.
• There are reportedly 536 major reservoirs in the
basin.
58. Chemical Hydrogeology
• Solute & Particle Transport
• Aqueous Geochemistry
• Chemical reactions
• Equilibrium Thermodynamics
• Mass Transport (MT)Analysis
– MT in GW flow(Geologic/ Aqueous systems)
• Studies on Water Quality Parameters
• Water Pollution –sources & Impact Analysis.
67. Aqueous Geochemistry
• Aqueous solution phase
• Gas-solid phase
• Occurrence of mass in water (ions/metals/etc)
• Reactions
• Groundwater Composition dynamics
68. Chemical Reactions
• CO2-water systems
• Alkalinity
• Organic solutes in water
• Volatilization
• Dissolution-Precipitation
• Solubility of mineral species
• Complexation Reactions
• Oxidation-reduction reactions
• Hydrolysis
• Isotopic reactions
• Equations of mass-transport, reactions, etc.= Reaction Path
Models.
69. Saturated-Unsaturated Zone
• Isotopic studies
• Dating of water
• Determination of velocity of flow of water
• Residence time
• Heat transport
• Conduction/ Convection
• Geothermal energy/hotsprings/geysers
• Aquifer Thermal Energy storage.
70. Mass Transport in Geologic systems
• Carbonate rocks- Karst Hydrogeology
• Dolomitization
• Evaporites
• Salt deposition-Salt pans
• Petroleum reservoirs.
• Geochemical Modeling
• Mass Transport simulation in 2D and 3D.
71. Hydrogeophysics
• Geophysical prospsecting of GW
– Electrical, seismic, electromagnetic methods
• ERM( profiling, 2D or 3D sounding )-Imaging
• EM sounding- depth
• Seismic profiles
• Weathered zone, GW potential zones
• Fracture trace analysis
• Saltwater-freshwater interface detection
• Contaminant plume detection.
83. Other Approaches
• Borehole Geophysical Logging
• Use of Satellite Images for
– Landuse/landcover analysis
– Hydrogeomorphic units demarkation
– Geology
– Structures
– Lineaments
• Use of GIS as a tool in all approaches.
99. Mathematical models help in order to
• evaluate the existing system ,
• generate new ideas,
• test new applications / approaches
• identify the problem areas and
• to reduce the cost of adhoc
experimentation.
104. Groundwater modelling requires
• the following domain specific
information:
• physical units,
• hydrologic conditions,
• aquifer parameters ,
• time varying inputs and
• boundary conditions.
105. Fundamental equations:
• Two-dimensional case:
• d (Tx - dh) + d (Ty dh) = S dh + w(x,y,t)
• dx dx dy dy dy
•
• Three-dimensional case:
• d (Tx - dh) + d (Ty dh) + d (Tz dh) = S dh + w(x,y,z, t)
• dx dx dy dy dz dz dy
106. APPROXIMATION:
• Finite Difference method
• Finite element method
• Integrated finite difference method
• Boundary integral method
• Random walk method
• Method of characteristics using FD/FE
165. Rock fragments with clay: light
pale to pinkish brown fragments
of quartzite, quartz and some
ferro-magnesium minerals with
little clay.
clayey sand
Silty clay
Quartzite Bed Rock: light pale
to dark brown colour chips of
micaceous quartzite.
170. • First Layer (Sandstone)
First
Layer
(
Sea
(Bay of
Bengal)
Aquifer - I
(Sandston
e)
Aquifer – IV
(Sandstone)
Second Layer
(Clay)
Aquifer – II
(sandstone)
Sixth layer
(Clay)
Fourth Layer
(Clay &
Lignite)
Aquifer - III
(Sandstone)
Perumal
Eri
Neyveli
Lignite Mine
45,000
GPM
pumping
Aquifer Management Plan
(aquifer unit wise) (lower Vellar water shed, TN)
basement
Aquifer Issues
I - Aquifer o Pumping for irrigation,
Industries & Domestic.
o Sea water intrusion
II- Aquifer o Pumping for irrigation,
Industries & Domestic.
o Sea water intrusion
III- Aquifer o Heavy withdrawal for Lignite
mining (45,000 GPM)
o Sea water intrusion
Aquifer Management
I - Aquifer Desilting of Perumal Eri (will induce recharge)
II - Aquifer Managed Aquifer Recharge
III - Aquifer Planned Pumping schedule & Managed Aquifer
Recharge, after completion of mining
IV - Aquifer Future allocation for drinking purposes
171. Water Technology
• Water Purification
• Demineralisation
• Desalinisation
• Corrosion control
• Controlling Scale formation
• Hydrofracturing
• Drilling Technology
• Water supply-Drip Irrigation systems.
180. The basin occupies an arial extent of
2550.08 sq.km covering most of the areas
in Villupuram, Vanur, Gingee, Tindivanam
Taluks and partly the areas in Polur,
Tiruvannamalai and Vandavasi Taluks,
partly in UnionTerritory of Puducherry
and less than 1% of the area covered in
Cuddalore District.
181.
182.
183.
184.
185. Soils play an important role in groundwater
quantity and also in quality.The major soil
types of this basin is clay loam,clay,
sandy,sandy clay and clay soils.
186. Mapping of lineaments is very useful
especially in hard rock areas where
the occurance and movement of gro
und water is mostly confined to
these features NE-SW,NW-SE and
NNW-SSE trending lineaments are
the major lineaments mapped in
this basin.
These lineaments are traversing on
the barren land areas in between
the Tindivanam-Mailam-Gingee
areas.
187. Twelve raingauge stations in and around the basin having the long term records are
considered for detailed analysis.
188. The average annual precipitation of the basin is 108 cm.The amount of rainfall
increases towards the east coast than the western part of the basin.
189. The basin receives the rainfall in the range
of 300 to 500 mm during the south west
monsoon
190. Legend
N
EW
S
VARAHANADHI RIVER BASIN
NORTH EAST RAINFALL CONTOUR
12°00'
12°00'
12°15'
12°15'
79° 15'
79° 15'
79°30'
79°30'
79° 45'
79° 45'
Bay
of
Bengal
$
$
$
Gingee
Vidur Dam
Pondicherry
Rain fa ll in m m
350-400
400-450
450-500
500-550
550-600
600-650
650-700
700-750
$ Raingauge Station
MAP : 3.4
4 0 4 8
Scale
Km
Nallavur Basin
Ponnaiyar Basin
Palar Basin
Ongur Basin
The basin receives the maximum rainfall during the retreating north east monsoon
period amounting nearly 43 to 63 percent of the annual rainfall.
191. The rainfall of the hot weather station is as low as 2 to 3 percent of the annual rainfall.
192.
193. The geomorphological landforms in sedimentary and hard rocks plays an important role in the water resources
study. IRS-1D Satellite LISS III data (false colour composite) has been used to demarcate the different geomorphic
units. In the eastern part of the basin it is covered by sedimentary with marine landforms whereas the western part
is covered by hard rock terrain which exhibits denudational landforms.
194. In the Buried pediment shallow, moderate and in the deep landforms with lineament
intersection points are found to be favourable for groundwater development.
195. 1. By using IRS ID – LISS III Remote Sensing Satellite imagery of Pre monsoon 2005, the image mosaic map was generated MGE – Image Analyst of
Intergraph digital image processing software and Arc view Geographical information system software were utilized for generation of this map. Visual
and mechanical interpretation techniques were applied to derive the thematic maps on geology, geomorphology, drainage, land use, lineament,
wastelands maps structural hills with dense forest area are seen south west of Gingee area where hilly regions in deep red colour are exhibited as
pockets. In sedimentary area in the east, cashew plantation is in dark red colour. Command area is also seen in thick red colour . Salt pan areas are
seen in white and ash colours in the coastal area. Beach sand dunes are exhibited in white colour.
196. In the sedimentary areas and along the river courses the groundwater potential is
very good whereas in the hard rock areas especially in the pediment and in the
shallow pediment areas the availability of groundwater is less.
197. Most of the wet crops such as paddy,
sugarcane etc., are cultivated using the
rivers, streams,lakes , reservoir and tanks.
Dry crops are practiced using groundwater
spatially in the study area.
198. Wasteland is described as degraded land which can be brought under vegetative
cover with reasonable effort and which is currently under utilised and land which
is deteriorating for lack of appropriate water and soil management or on
account of natural causes.
199. The appraisal of the ground water occurance is based on geological evaluation
and observation wells.An inventory of about 22 observation wells spread over
the entire basin has been scrutinised and periodical water level fluctuations
were examined.
200. From the map,it is found that the shallow water table occurs in the crystalline complex
especially in the western portions of the basin and the deeper water table exists in
sedimentaries near the coast line.The following steps have been adopted in preparing
the grid deviation water table map of the basin.
201. In majority of the areas of
varahanadhi basin the water level is
in the range of 5 to 10 m below
ground level. In the areas of vanur
taluk particularly in sandstone
areas the water level has gone
below 10 m below ground level.
In this basin most of the area the water
level is in the range of 10 to15 m below
ground level. In the northeastern part
and in few parts of south western
portion the water level is in the range
of 5 to 10 m below ground level.
202. In the hard rock area the transmissivity of the formation ranges upto 200 m2
per day and in the sedimentary formations about 70% of the borewells the
transmissivity value ranges between 300 to 1800 m2/day and in 30 % of the bore
wells the transmissivity value was found to be in the range of 350 to 8000
m2/day especially in some areas in Union Territory of Puducherry and in
sandstone areas of vanur taluk.
203. For evaluating the groundwater potential zones of the Varahanadhi river
basin about 120 ves locations have been used. Due to high degree of
heterogenity noticed in the hard rocks, the identification of deep water
bearing horizons below 70 m requires intensive analsis.
205. The shallow and moderate thick top soil zones exist in hard rock areas of this basin and
the deep top soil zones existing mostly in the eastern part of the basin is made up of
sedimentary formations and will be most suited for water conservation structures.
206. The weathered zone existing at a depth of 4 to 18 m spread wide over the
central and western parts of the basin. The moderately deep weathered rock
area is commonly occurred in surrounding the shallow weathered areas.The
deep weathered rock occurs as small patches in the hard rock region.
207. The fractured rock at deeper
depth exists in lesser area of
hard rock terrain and the
corresponding sandstone
/limestone spread well over
the sedimentary region
208.
209. This study clearly state that the areas covered by cluster III and IV are not suitable for setting
up of any new groundwater developmental activities. These two clusters mostly falls in the
northeastern part over the study periods where the groundwater is polluted mainly by dry
deposition of saline water as well as dumping of solid wastes.
Hilly and Quarry areas: Catchment area treatment techniques should
be implemented to check the surface run off and the possibilities of
converting abandoned quarries into recharge structures could be
explored.
Drastic measures need to be taken to minimise groundwater extraction in the area.
Further developments should be carefully planned without harming the groundwater regime.
210. Legend
Ponnaiyar Basin
Palar Basin
Ongur Basin
Nallavur Basin
N
EW
S
VARAHANADHI RIVER BASIN
WATER QUALITY CONTOUR
(TDS - POST MONSOON 2005)
12°00'
12°00'
12°15'
12°15'
79° 15'
79° 15'
79° 30'
79° 30'
79° 45'
79° 45'
Bay
of
Bengal
(
(
(
(
(
(
(
(
((
(
2 0 2 4
Km
Scale
TDS in mg/l
1200 - 1500
300 - 600
600 - 900
900 - 1200
( Observation Well
Hill
MAP : 7.8
211.
212. Time and tide wait for none
Slow and steady wins the race