GPR survey for subsurface utility mapping at Ahmedabad


Scope of Work:

GPR survey execution for mapping underground utilities to ensure 30 m wide clear stretch for smooth installation of new pipeline in Dahej


Ahmedabad, Gujarat, India.


Simplex Infrastructure Limited


GSSI SIR-3000 equipped with 200 MHz and 400 MHz antenna


Undulated land for data collection, industrial area having chemical contaminated medium, weak signal GPR data


The GPR survey has been carried out at proposed metro station site near Paldi area of Ahmedabad. The total area scanned was approximately 3000m2 in 2 different patches on the main road. The scope of work includes the mapping of all possible underground utilities up to the depth of around 6-7.5 m using non-destructive Ground Penetrating Radar technology. The purpose of the project was to locate all the underground utilities so as to acquire a clear space for constructing the metro station and to prevent the damage of existing underground utilities during the project execution. Considering the client's requirements and the expected depth of the utilities, the area has been surveyed using 200 MHz and 400 MHz center frequency antennas mounted with SIR 3000 GPR system to cover the depth up to 6-7.5 m with the fair resolution. The purpose of the survey was to map all the underground utilities viz. cables, water lines, gas lines, sewer line etc. up to the depth of 6-7.5 m using non-destructive technology with the aim of constructing a metro station without damaging the already existed underground utilities. The whole data is collected in two patches of the main road. Numerous parallel profiles have been collected across the width as well as along the length of the road at a spacing of 3 m. Overall eleven utilities are observed along the road at proposed station site. Surface and buried manholes are also marked in the drawing. Several higher reection points are also marked in the drawing. However, no utility is found to exist at a depth greater than 4.6 m.

GPR data at dahej
GPR layout at dahej
GPR data 2  at dahej