SDT Division

Director (in-charge)
Survey & Data Division

Hydro-meteorological Measurements (HMM)

Hydro-meteorological data is essential for planning, design and implementation of all water related projects including irrigation, drainage and flood control.  IWM collects the above data by maintaining the quality through frequent supervision of the collection system in the field as well as systematic processing and consistency check of the data in the office.

  • Water Level
  • Liquid flow
  • Sediment volume and fall velocity
  • Rainfall
  • Temperature
  • Pressure
  • Groundwater

Water Quality Investigation (WQI)      

Understanding of the level of water quality parameters is essential for the conservation of environment including drinking, irrigation, fisheries and recreation. During recent days IWM has acquired sufficient skill in monitoring the following water quality parameter for different studies.

  • Salinity
  • Biochemical Oxygen Demand (BOD)
  • Chemical Oxygen Demand (COD)
  • Dissolved Oxygen (DO)
  • Ammonia (NH3), Nitrate (NO3)
  • Lead (Pb), Chromium (Cr)
  • Mercury (Hg)
  • Phosphate (PO4)
  • Coliforms
  • Turbidity

Hydrographic Survey (HgS)        

IWM has proven experience in collecting the following types of data to support morphological assessment of the rivers for bank protection and drainage improvement.

  • Bathymetry  / Cross sections of the rivers
  • Bank line movement
  • In-situ measurement of flood plain sedimentation


Laboratory Analysis of Sediment Samples (SedLab)

IWM maintains a well-equipped sediment laboratory to analyze the sediment samples to support morphological assessment of the rivers. The services provided from the sediment laboratory include:

  • Grain size distribution of the bed materials
  • Concentration test of suspended sediment
  • Separation of fine and coarse sediment in suspension
  • Grain size distribution of suspended sediment.

Topographic Survey and Mapping (TSM)

IWM conducts topographic survey to update land level and land use pattern, infrastructure development including drainage and irrigation facilities and communication networks.  The data is collected through state-of-the-art equipment like RTK-GPS, Total Station and DGPS.  The data is processed through professional software.  The result is archived and presented in the form of topographic maps for any future use.