10 months ago
Assam Flood Safety: Study Urges Floodplain Zoning and Timely Dam Releases
Imagine a big river in a place called Assam.
Sometimes, when it rains a lot, the river can overflow and flood nearby towns and farms.
There are also big dams built to make electricity, but sometimes these dams have to release a lot of water very quickly.
This extra water can make the floods even worse for people living downstream.
A new study by scientists says that to keep people safe, they need to plan where floods might happen (floodplain zoning) and make sure the dams release water at the right time, not all at once.
They also need to work with other countries, like Bhutan, where some of the rivers start.
The study wants to make better predictions of how much water will flood so people can be warned and move to safety.
They also want to install special tools to measure water flow more accurately.
A study by NESAC and ASDMA highlights the importance of floodplain zoning and coordinated dam releases for downstream safety in Assam.
The research focused on three hydropower projects: Ranganadi, Doyang, and Kurichhu.
The Ranganadi hydroelectric project's peak discharge of 760 cumec could flood 1,391 hectares downstream.
The study emphasizes that dam operations, while beneficial for energy, can increase downstream flood risk.
Researchers recommend installing four new discharge measurement stations to improve inundation scenario accuracy and noted the need for cross-border cooperation with Bhutan.
- Who
- NESAC and ASDMA researchers
- What
- A study emphasizing the need for floodplain zoning, community preparedness, and coordinated dam water release for downstream safety.
- Where
- Assam, India, focusing on Ranganadi, Doyang, and Kurichhu hydropower projects
- When
- November 10
- Why
- To safeguard downstream communities and agricultural assets from flooding, exacerbated by hydropower reservoir operations.
Study Findings
Challenges and Gaps
Dam Operation Impact
Study Findings
Dams can be helpful for energy and irrigation but can also change river flow or increase flood risk downstream.
Challenges and Gaps
The operation of upstream hydropower reservoirs, with controlled or emergency releases, can trigger downstream inundation, exacerbating flood risks.
Data Availability
Study Findings
Generated inundation scenarios can enable operators to anticipate village-level impacts and time evacuation and warning dissemination.
Challenges and Gaps
Dam water release data from Bhutanese projects was not available, relying on hypothetical scenarios; final inundation scenarios will be more realistic once spillage data is correlated with observed river flows from ungauged channels.
Key facts
- Study Name
- Flooding scenario generation and discharge based downstream impact study in Assam for Ranganadi, Doyang & Kurichhu hydro power projects
- Collaborating Agencies
- NESAC and ASDMA
- Ranganadi Discharge
- 760 cumec peak observed water discharge
- Ranganadi Potential Flood Area
- 1,391 hectares downstream
- Proposed Measurement Stations
- Four state-of-the-art discharge measurement stations
- Cross-border Relevance
- Kurichhu-Beki system (Bhutan and India)
Quotes
researchers
the researchers who conducted the study
“Dams can be helpful for producing energy and irrigation, but they can also change river flow or increase the risk of flooding at the downstream. Floods remain the most persistent natural hazard in Assam, primarily driven by the Brahmaputra's dynamic hydrology, high monsoonal rain-fall and trans-boundary inflows. The challenge intensifies with the operation of upstream hydropower re- serviors, whose controlled or emergency releases can trigger downstream inundation.”
assamtribune.com
they
the researchers who conducted the study
“As currently these channels are all ungauged, installation of four state-of-the-art discharge measurement stations are proposed for approval by the Government of Assam. If installed, the data from these stations will compliment the current in- undation scenarios for further improvement in accu- racy and precision of the inundation simulation output.”
assamtribune.com
it
the study
“Quantifying down- stream response to hypothetical releases establishes a negotiation-ready frame- work for data sharing proto- col and real time coordination between national hydro power and disaster agencies.”
assamtribune.com
