Geo-referenced survey and Asset Survey to prepare GIS map for Water Supply Project

Client
Smec India Pvt. Ltd.

Location
Gangtok, Sikkim

Service CategoryGIS-Mapping SectorWater Resource Engineering

The main objective of the project is to prepare a GIS digitized map for renovating the existing water supply system and construction of new water supply system infrastructure for the Greater Gangtok Area.

The grater Gangtok is the subject project area (200km) comes under the hilly terrain. Presently the existing water supply system of Gangtok is based on surface water from River Ratey Chu at Intake located around 14 kms from the WTP at Selep in the outskirts of Gangtok. So starting from source to distribution to consumer is under our project corridor.

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 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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