ANNOUNCEMENT
The Foreign Branch office of PARSAN becomes Operational in Singapore, Kingdom of Saudi Arabia and Bahrain!

Dam Safety Geophysical Services Provider in India

Back to Services

Dams in the country represent a major investment and huge benefits to population in terms of irrigation, power and flood control. Most of the big dams are very old and regular monitoring and maintenance of these dams is of utmost importance for continuing benefits. Unlike soil investigations, critical nature of dams, does not permit traditional invasive inspections by means of drilling, and such inspections are best avoided unless extremely important, and are done only when problem is too grave.

Geophysical techniques, by virtue of their non-invasive and non-destructive nature, offer an excellent solution for investigation or regular monitoring of dams, and detection of anomalous conditions which might snowball into major problems if left untreated.

Various geophysical methods are available to investigate the problems of earthen, masonry, concrete or composite dams:

  • Leak path detection
  • Internal Erosion
  • Identification of zone of water accumulation
  • Cavity/ sinkhole
  • Concrete degradation
GEOPHYSICAL METHODS ISSUES AND CONCERNS
CONCRETE DAM EARTH EMBANKMENT DAMS MASONRY DAMS
CRACKS DEGRADATION WATER LEAKS LANDSLIDE SINK HOLES WATER LEAKS STRENGTH
Electrical Resistivity              
Streaming Potential              
Georadar              
Radar Tomography              
Seismic Tomography              
Seismic Refraction              
ReMi              
Electrical Resistivity Imaging

The results of electrical surveys carried out on the crest of a dam are presented as vertical sections showing the electrical properties of the dam materials. Electrical currents travel along preferential pathways in the most conductive materials such as dam core composed on fine grained materials. ERI for dam safety is paramount because the electrical resistivity imaging provides picture of internal resistivity distribution of the dam structure, identifying areas of water saturation in the dam body, and thus identifying the zones of water accumulation and wetting.

Streaming Potential

The streaming potential method consists of measuring the electrical potential by flowing water within a structure or subsurface. Common applications for SP measurements include assessing seepage from dams and embankments.

Ground Penetrating Radar

GPR survey is conducted to identify shallow cracks, cavities and voids in the dam body. The survey also might reveal the stratigraphy in the dam body based on contrast in dielectric constant.

Seismic Tomography

Provides detailed information on strength of material within the dam, based on seismic velocity.

Seismic Refraction

Can be used to determine bedrock topography and presence of fractures, faults and shear zones, if any.

ReMi

To determine shear wave velocities in Dam body.

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