Introduction

Introduction

Introduction to Real Time Data Acquisition System (RTDAS) and Real Time Data Decision Support System (RTDSS)

General Note on RTDAS

Hydrometric observations serve a very important role in the decision-making process with the application of real-time hydro-meteorological monitoring systems. Real time knowledge of water resources helps planners make informed decisions for flood forecasting, water supply management, irrigation, hydro generation, as well as environmental monitoring and planning. Hydrometric observations coupled with real-time telemetry become the basis for objective analysis of water resources. The telemetry and real-time Decision Support Systems (DSSs) brings the data to life. This allows operators to consider numerous operating criteria and the impact of any decision, rapidly, efficiently, and consistently.

A Hydrological Information System (HIS) would be designed to monitor all the processes of the hydrological cycle, which includes rainfall, evaporation, flow of rivers, groundwater recharge and extractions, etc. In a modern HIS, automatic telemetric instruments are used to measure and transmit hydro-meteorological parameters on a real time basis.  Real Time HIS consists of sensors, a data collection platform, power supply, telemetry, database management system and dissemination systems.

Real Time Data Acquisition System works inin following three steps

Data Collection Platform (DCP):

This is the platform where the sensors are mounted. The DCP supplies power to various sensors, charges the battery using solar panels, stores the data in the data logger and provides protection to equipment from dust, water and theft. Most stations in a real-time network are required to run on battery power packs with solar charging since there might not be any power connections.

Telemetry Device:

This device receives data from the DCP (data logger) and transmits them to data centres via an appropriate telemetry method. The telemetry proposed under the project is based on technologies such as the Global System for Mobile (GSM)/ General Packet Radio Service (GPRS), Indian National Satellite System (INSAT) and Very Small Aperture Terminal (VSAT).

Database Management System:

This system is installed at the data centres and receives the data from the telemetry device. The data are then checked for quality and consistency, stored in a structured format, and made available to stakeholders by different means. This section shares information about national database management software, E-SWIS/WIMS, which is already available for all Central Water Commission (CWC) agencies.

Highlights on RTDAS

  • Real Time Hydro-Met data acquisition network is implemented under this Hydrology Project (SW) Maharashtra, provides key data required for forecasting Inflows into the Basin and other related activities.
  • A Real Time Data Acquisition System (RTDAS) consists of a Telemetry Network of Automated Rainfall Stations, automated weather station and water levels stations along rivers/reservoirs which will be installed to provide inputs to the RTDAS.
  • The concept of implementation on which the present technical specifications and special conditions are based intends to combine the advantages of modern Data Loggers, data storage, processing and data communication technologies with the requirements of high availability and sustainability required by such an important project.
  • The real-time data acquisition system networks have the greatest possible reliability, thus minimizing the maintenance to the extent possible.

 

Benefits of RTDAS

  • Cost effectiveness
  • High frequency of data
  • Better ability to detect extremes
  • Deployment in hostile locations
  • Faster access to data
  • Consistency and objectiveness in measurement
  • The ability to perform automatic quality monitoring

 

Measurement frequency

Station Type

Parameter

Type of Sampling

Sampling Interwal

ARS

Rainfall (mm)

Cummulative

15 mins

AWS

Minimum Temperature (°C)

Instantaneous

Daily

 

Maximum Temperature (°C)

Instantaneous

Daily

 

Minimum Humidity (%)

Instantaneous

Daily

 

Minimum Wind Speed (m/s)

Instantaneous

Daily

 

Maximum Wind Speed (m/s)

Instantaneous

Daily

 

Minimum Atmospheric Pressure (hpa)

Instantaneous

Daily

 

Maximum Atmospheric Pressure (hpa)

Cummulative

Daily

 

Max Solar Radiation (w/m²)

Cummulative

Daily

 

Automatic Evaporimeter

Cummulative

Daily

ODS

Reservoir Level (mtr.)

 

 

 

Gross Contents (McuM)

 

 

 

% Contents (%)

 

 

 

Live Contents (McuM)

 

 

 

Discharge Rate (Cumecs)

 

 

 

Cummulative Discharge (McuM)

 

 

RDS

Minimum Level (Mtr.)

 

 

 

Maximum Level (Mtr.)

 

 

 

Minimum Stage Discharge (Cumecs)

 

 

 

Maximum Stage Discharge (Cumecs)

 

 

 

 

 

 

 

ARS : Automatic Rain Gauge Station
AWS : Automatic Weathering Stations
ODS : Automatic Reservoir Water Level Recorder & Outflow Discharge Station
RDS : Automatic River Water Level Recorder & River Discharge Station



Last Modified on : 19 May, 2021