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Effective flood management with a real-time streamflow forecasting and reservoir operation system
Highly variable rainfall in different areas of the western Indian state of Maharashtra made integrated operation of the 46 reservoirs in the Krishna and Bhima River Basins difficult. Combined with delays in receiving up-to-date data, this made efficient flood management problematic for the Government of Maharashtra’s Water Resources Department. To help them, we developed the Real-Time Streamflow Forecasting and Reservoir Operation System (RTSF & ROS) – a real-time decision support system. Our solution uses data collected from 300 stations to provide water authorities with accurate hydro-meteorological information. Now Maharashtra’s Water Resources Department can optimise the operation of the area’s reservoirs and improve flood management significantly.
Difficulty in making operational decisions
There are 46 reservoirs in the Krishna and Bhima River Basins in the western Indian state of Maharashtra. These reservoirs are used for hydropower generation and irrigation, as well as for domestic and industrial uses. However, rainfall in these basins is highly variable – ranging between 6 m of rain in the upper catchments to as little as 40 cm of rain in the lower ones.
The large variability in rainfall throughout the 69,967 km2 area of the basins made flood management difficult. As a result, the area regularly experienced flooding events. In 2005 and 2006 alone, extreme flooding in the areas around the basins caused loss of lives and extensive property damage.
Water authorities in Maharashtra had been operating the basins on rigid schedules and as single entities based on historical hydro-meteorological data and previous experience. This method did not allow for the efficient integrated operation of multiple reservoirs. There was also a considerable time lag between data observation in the field and decision makers receiving it. This left little time to develop flood forecasts. As such, it was difficult to make optimal operational decisions, especially related to flood management.
Enabling integrated operation
To help our client improve flood management operations, we developed the Real-Time Streamflow Forecasting and Reservoir Operation System (RTSF & ROS). The web-based and user-friendly real-time decision support system – developed using MIKE 11 (now MIKE HYDRO River) as its foundation – includes:
Combined with information and communications technology, our state-of-the-art decision support system can help water authorities:
The RTSF & ROS utilises the information collected from 300 telemetry stations in the Krishna and Bhima River Basins. These stations provide real-time data on rainfall, reservoir water levels, gate positions, river water levels and discharge, as well as other climatic parameters.
The system’s hydrological, hydrodynamic and real-time flood forecasting modules then utilise the collected data to help authorities monitor and forecast streamflow, as well as manage the operations of the 46 reservoirs in the basins.
As part of the project, we also developed a knowledge base system (KBS)– driven by MIKE OPERATIONS – for the Krishna and Bhima River Basins. Fully integrated with the RTSF & ROS, the KBS includes comprehensive historical hydrological and GIS data. The KBS imports and validates the real-time data, then converts the data into time series formats to run our reservoir operation and forecasting models. These are then archived in the KBS for future use.
The forecasting system can also run different scenarios offline so that water authorities can compare historical floods forecasted in hindcast mode with current hydrological events. This data can be used in climate change models as well as to aid in operational decision making.
After a successful test of the RTSF & ROS with our client, water authorities in the Krishna and Bhima River Basins used the system during the monsoon season in the following year. The ability to operate the reservoirs in an integrated manner ensured the optimal use of water resources for power production, irrigation and water supply, and also minimised flood risks in flood-prone urban and rural areas.
In addition to the RTSF & ROS, we also developed a communication and information management system for the basins. It consists of three main components:
Our solution allows water authorities and decision makers to quickly and easily access the latest data, enabling them to make sound flood management decisions. It also helps water authorities disseminate information to disaster management agencies as well as to the wider community.
Improvement in flood management in the Krishna and Bhima River Basins
Enabled integrated reservoir operation
Development of a hydrological knowledge base system better planning in water resources
Water Resources Department, Government of Maharashtra
MIKE HYDRO RiverMIKE OPERATIONS
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