The document summarizes a study that used geoelectrical resistivity methods to investigate groundwater conditions in the Korin aquifer in southeast Iran. 596 vertical electrical soundings were conducted across 26 profiles between April and June 2001. The results showed that the aquifer thickness increases toward the south, while resistivity decreases toward the north due to increasing salinity and clay content. The study was able to determine the aquifer boundary, thickness, and resistivity of subsurface layers. The best areas for future groundwater development are the southeastern and northwestern parts of the aquifer based on higher permeability and storage coefficient.

1. A N INVESTIGATION OF
GROUNDWATER CONDITION BY
GEOELECTRICAL RESISTIVITY
METHOD : A CASE STUDY IN K ORIN
AQUIFER , SOUTHEAST I RAN
B Y G.R. L ASHKARIPOUR

2. I NTRODUCTION
 Korin basin lies in the southeastern part of Iran
 Basins characteristic:
 Arid climate
 Small amounts of precipitation (84 mm/year)
 About 3400 km2
 Main water supply challanges:
 Rapid population growth
 Agricultural development
 Studys objective is to learn how to protect water supplies

3. V ERTICAL ELECTRICAL
SOUNDING ( VES )
 In order to study aquifers characteristics a
resistivity survey was carried out
 Survey involved vertical electrical sounding
 VES is based on measuring the potential between
one electrode pair while transmitting direct
current between another electrode pair

4. D ATA ACQUISITION
 The resistivity survey was completed with 596
sounding stations in 26 profiles
 Field survey was carried out between April to
June 2001
 Schlumberger array was used to conduct out the
study

5. R ESULTS AND DISCUSSION
 Nomerous geoelectrical stations were purposely
located near wells
 Because of the wells dug in the center of the
aquifer the thickness and characteristics of the
aquifer are fairly well known
 The boundary of the aquifer, thickness and
resistivity of subsurface layers were determined
 Data pointed out that bedrock of the aquifer is
the same

6. R ESULTS AND DISCUSSION
 In northwestern and southeastern part the
permeability and the storage coefficient is higher
 Due to finer materials of sand and silt mixed with
clay the resistivity is lower in the central and
nortern parts
 For future developments and drilling sites the
best part of the aquifer is southeastern and
northwestern parts

7. C ONCLUSIONS
 An inexpensive method for characterizing the
groundwater conditions is the geoelectrical
soundings
 Due to increasing salinity of water and/or clay
content the resistivity of the aquifer decreasing
towards the north
 The aquifer thickness increases towards the
south
 For future development zones with high yield
potential have been determined

8. R EFERENCES
 An investigation of groundwater condition by
geoelectrical resistivity method: A case study in Korin
aquifer, southeast Iran
By G.R. Lashkaripour
http://www.spatialhydrology.com/journal/paper/geoe
lectric/geoelectric.pdf

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