Topography survey for Water supply Project under GMDA, Guwahati

Client
IVRCL/GMDA

Location
Guwahati, Assam

SERVICE CATEGORYGIS mapping, Topographic SectorWater Resource Engineering

The Government of Japan extended a package of Official Development Assistance to India to construct water supply facilities in the south-central and north zones of Guwahati city ( 2500 ACRE).

The new infrastructure, funded by the Japan International Cooperation Agency, will provide continuous, pressurized and potable water supply to all people living in the area, significantly improving current living standards in the Guwahati City.

BPC India has been preparing detailed drawings of water supply facilities, reviewing and as a part of design process is conducting topographical survey, contour survey and GIS-based mapping. The total construction cost of this project is 5000 cr.

The tasks that are performed during the project work are as follows:

  • Centre line of all existing roads, lanes, streets, footpaths, cart-tracks (all walkable and drivable ways where pipelines exist or can be laid in future) and their widths.
  • Road and shoulder edges (up to existing private land/ property) of all roads, lanes, streets, footpaths, cart-tracks (all walkable and drivable ways where pipelines exist or can be laid in future).
  • Reduced Levels along all roads, lanes, streets, footpaths, cart tracks (all walkable and drivable ways where pipelines exist or can be laid in future).
  • Culverts, bridges, causeways;
  • Retaining walls, Guard wall if any, other boundary walls.
  • Type of pavement as well as footpath/ shoulders over all roads, streets, lanes, cart-tracks (concrete, pitched boulders/ brick footpath, WBM and earthen roads, ).
  • Road intersections and crossings.
  • Open and covered drains.
  • Layout of Government lands or vacant government land like schools, parks, play grounds, or
  • any other open spaces (where storage tanks or pumping stations can be constructed in future).
  • Names of places, names of prominent buildings, names of every road crossing, names of localities, etc.
  • RL and layout of all above assets
  • All topographic and man-made features
  • Borrow pit/ pond/ ditch/ toe drain profile, where present
  • All break-points of natural ground
  • Positions of individual entities such as trees, service lines & poles, pillars boxes, wells, etc.
  • Property lines and structures (with description)
  • Stream or drain bank line, bed line (if dry) and cross sections.
  • The data for each survey points are recorded in terms of Northing, Easting, and Elevation. To ensure standardization of works of different survey teams and to facilitate further CAD works, a rational coding system for the features has been developed and used. Different types of features are mapped and stored in different layers (files). These features are geo-referenced.
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