Replacement of border fencing phase-i (18.195 km) and phase-ii (0.706 km) to high-security weld mesh fencing in gopalpur to coochbehar sector of west bengal. sh- conduct a topographical survey of land and bathymetric survey of rivers for fixing the alignment of fence/road for the proposed area and its prominent surface features using total station, dgps or any advance, precise survey instrument as suitable for the job and preparation and submission of detail survey report as per deion of work and direction of engineer-in-charge.