Dams and Hydroprojects
HMDA to use bioremediation to clean up Hussainsagar lake
Why in the News?
The Hyderabad Metropolitan Development Authority (HMDA) has announced a new advanced bioremediation initiative using enzyme solutions and biochar-based Bokashi balls to clean and restore Hussainsagar Lake, which has long suffered from algal blooms, foul odour, sewage inflow, and industrial pollution.
About Hussainsagar Lake
- A 16th-century artificial lake in Hyderabad.
- Faces severe pollution due to:
- Sewage inflow
- Nutrient overload (nitrates, phosphates)
- Industrial waste
- Problems: algal blooms, foul odour, low Dissolved Oxygen (DO), high Biochemical Oxygen Demand (BOD).
What Is Bioremediation?
- Definition: Use of microorganisms, enzymes, or biological materials to break down pollutants and restore ecosystems.
- Types relevant here:
- In-situ bioremediation – treating the lake onsite without removing water.
- Bio-augmentation – adding microbial cultures to enhance degradation.
- Aerobic/oxygenation systems – boost DO to improve water quality.
New Intervention Planned by HMDA
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Enzyme Solutions
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- Enhance microbial breakdown of organic pollutants.
- Help reduce nutrient load responsible for algal blooms.
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Bokashi Balls (with Biochar)
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- Bokashi = fermented organic matter rich in beneficial microbes.
- Biochar:
- Carbon-rich material produced from biomass.
- Increases microbial activity, absorbs toxins, improves water clarity.
- Purpose:
- Reduce algae, odour, pathogenic bacteria.
- Increase water transparency and DO levels.
| In the context of solving pollution problems what is/are the advantage/disadvantages of bioremediation technique? (2017)
1. It is a technique for cleaning up pollution by enhancing the same biodegradation process that occurs in nature. 2. Any contaminant with heavy metals such as cadmium and lead can be readily and completely treated by bioremediation using microorganisms. 3. Genetic engineering can be used to create microorganisms specifically designed for bioremediation. Select the correct answer using the code given below: (a) 1 only (b) 2 and 3 only (c) 1 and 3 only (d) 1, 2 and 3 |
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Dams and Hydroprojects
Meghalaya’s Umngot River turns Muddy
Why in the News?
The Umngot River, celebrated for its crystal-clear waters and tourist appeal at Dawki and Shnongpdeng, has turned murky and opaque.
About Umngot River:
- Location: Flows through West Jaintia Hills district, Meghalaya, close to the India–Bangladesh border.
- Origin: Arises from the Jaintia Hills, traversing limestone-rich terrain that naturally filters impurities and maintains clarity.
- Distinct Appearance: Known for its crystal-clear waters that create the illusion of boats floating on air, earning it global recognition.
- Length & Course: Flows southward to Dawki town, where it merges with Bangladesh’s Piyain River.
- Ecological Features: Possesses high dissolved oxygen levels, preventing algal growth and supporting diverse aquatic biodiversity.
- Tourism Hub: Popular at Dawki and Shnongpdeng for boating, fishing, camping, and eco-tourism, drawing thousands of visitors annually.
- Infrastructure Landmark: The Dawki Suspension Bridge (1932) is a heritage structure spanning the river and serving as a trade route link.
- Economic Role: Sustains cross-border trade, local fishing, and tourism-driven livelihoods vital to Meghalaya’s rural economy.
- Cultural Boundary: Serves as a natural divider between Ri Pnar (Jaintia Hills) and Hima Khyrim (Khasi Hills).
Cause of Discoloration:
- Primary Cause: Linked to Shillong–Dawki road-widening project upgrading it to a two-lane highway with a 400 m bridge at Dawki.
- Pollution Source: Hill-cutting, excavation, and soil dumping along sites near Umtyngar and Dawki caused heavy sediment runoff.
- Inspection Findings: The Meghalaya State Pollution Control Board (MSPCB) detected uncontained debris and sliding soil entering the river, reducing water transparency.
| [UPSC 2021] Consider the following rivers:
1. Brahmani 2. Nagavali 3. Subarnarekha 4. Vamsadhara Which of the above rise from the Eastern Ghats? Options: (a) 1 and 2 (b) 2 and 4* (c) 3 and 4 (d) 1 and 3 |
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Dams and Hydroprojects
Naying Hydroelectric Project
Why in the News?
The Naying Hydroelectric Project (1000 MW), proposed on the Siyom (Yomgo) River in Shi-Yomi district, Arunachal Pradesh, represents a major addition to India’s clean energy expansion under the Decade of Hydro Power (2025–35).
About Siyom (Yomgo) River:
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About Naying Hydroelectric Project:
- Overview: A proposed 1,000 MW (4Ă—250 MW) run-of-the-river project located in Shi-Yomi district, Arunachal Pradesh.
- Developers: Jointly undertaken by North Eastern Electric Power Corporation (NEEPCO) and Arunachal Pradesh Hydropower Corporation Ltd (APHCL).
- Design & Output: Features a concrete dam, underground powerhouse, and diversion tunnels, expected to generate 4,966.77 GWh annually.
- Regulatory Approval: Received Central Electricity Authority (CEA) concurrence in 2013; progress slowed by environmental and social concerns.
- Public Consultation: Environmental hearing scheduled for 12 November 2025 at Yapik Community Hall to assess ecological and community impacts.
- Timeline: Construction targeted to start by 2028, with commissioning by 2032.
- Policy Context: Forms part of the state’s Decade of Hydro Power (2025–2035), aiming for 19 GW capacity addition to support India’s net-zero goals.
- Regional Linkages: Among five key hydel projects in the region – Heo (240 MW), Hirong (500 MW), Tato-I (186 MW), and Tato-II (700 MW).
| [UPSC 2022] Consider the following pairs:
Reservoirs – States 1. Ghataprabha — Telangana 2. Gandhi Sagar — Madhya Pradesh 3. Indira Sagar — Andhra Pradesh 4. Maithon —Chhattisgarh Options: (a) Only one pair (b) Only two pairs (c) Only three pairs (d) All four pairs” |
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Dams and Hydroprojects
Sawalkote Hydro Project
Why in the News?
After suspending the Indus Waters Treaty, India is asserting water control in J&K by reviving the Sawalkote Hydroelectric Project — the UT’s largest planned hydro project.
About Sawalkote Hydro Project:
- Location: Ramban and Udhampur districts, Jammu and Kashmir.
- River: Built on the Chenab River (a western river under the Indus Waters Treaty).
- Agency: Implemented by National Hydroelectric Power Corporation.
- History: Proposed in the 1960s; delayed due to Pakistan’s objections, environmental issues, and red tape. Revived after India suspended the Indus Waters Treaty post the April 2025 Pahalgam terror attack.
- Status (2025): Forest clearance granted; tenders floated on 29 July 2025; declared a project of national importance.
- Timeline: 96 months post-clearance; expected commissioning by or after 2032.
Key Features:
- Type: Run-of-the-river (utilizes the natural flow and elevation drop of a river) hydroelectric project.
- Capacity: 1,856 Megawatts (8 Ă— 225 MW + 1 Ă— 56 MW).
- Dam: 192.5 m high, roller-compacted concrete gravity dam; reservoir holds 550 million cubic meters.
- Powerhouse: Underground, with Francis turbines.
- Cost: â‚ą22,704.8 crore (~2.6 billion United States Dollars).
| [UPSC 2009] Gandhi Sagar Dam is a part of which one of the following?
Options: (a) Chambal Project * (b) Kosi Project (c) Damodar Valley Project (d) Bhakra Nangal Project |
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