GPR survey for subsurface utility mapping at Ahmedabad


Scope of Work:

GPR survey execution for mapping exact alignment of existing underground ONGC pipeline


Ahmedabad, Gujarat, India.


Arvind Infrastructure Limited.


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


Undulated land for data collection, weak signal GPR data


The GPR survey has been carried out on an stretch of about 400m with approximate width of 20m at Arvind Uplands in Nasmed, Ahmedabad. The scope of project was to map the alignment of an ONGC line expected to be at a depth of around 2 - 3m to prevent the damage of the same while laying the new drainage line under the road. It is also required to know the alignment of the existing line to plan the layout of the new drainage line. Considering the visual inspection on site, depth requirement and interactions with client, data has been collected using 400 MHz antenna along with SIR 300 GSSI GPR system to cover a depth upto 3 - 4m. The survey was conducted using SIR-3000 GSSI GPR system equipped with 400 MHz antenna. The antenna frequency is chosen to achieve better depth of penetration with fair resolution upto 3-4 m. The data collected from the site has been processed appropri- ately and interpreted on the basis of the observed features. Over all two almost parallel pipelines along the road could be interpreted on the basis of repeating impressions. However, few extra high amplitude reections were observed, but due to unavailability of data the corresponding utilities could not be confirmed.

GPRcase study-arvind
GPRcase study-arvind
GPRcase study-arvind
GPRcase study-arvind