Oju Hydroelectric Project — Visual & Conceptual Aids
1️⃣ Map — Subansiri Basin & Cascade Projects
Topographic-style schematic map showing Oju (2,220 MW) and neighboring projects
India — China border
Redi village — Oju (uppermost)
Niare
Naba
Nalo
Dengser
Upper Subansiri
Lower Subansiri (2,000 MW)
Oju project — 2,220 MW (near Redi)
Upper Subansiri district, Arunachal Pradesh
Scale: approx. 0 — 50 km
Rivers in blue • Mountains shaded • Forest zones light green
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Note: stylized schematic map for concept use — not intended for navigation or precise geospatial analysis.
2️⃣ Schematic — Run-of-River + Peaking Dam Setup
Cutaway schematic with dam, 14.12 km headrace tunnel, underground powerhouse, and dam-toe powerhouse
Concrete gravity dam (100 m height)
Reservoir submerged ~43 ha
Reservoir — 43 ha submerged
Headrace Tunnel — 14.12 km
Underground Powerhouse — 2,100 MW
Penstocks → Turbines → Generators
Dam-toe Powerhouse — 120 MW
Penstocks (pressurized flow to turbines)
Transmission lines to grid
Legend — blue = water, gray = civil structures, green = terrain
100-m dam • Headrace 14.12 km • Underground PH 2,100 MW • Dam-toe PH 120 MW
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Schematic cross-section for conceptual design review (not an engineering drawing).
3️⃣ Flow Chart — Flood / GLOF Risk Modeling vs Design Margins
Flowchart showing modeling sequence and resilience measures
Glacial lakes in Upper Subansiri
(GLOF sources)
Simulation — Peak flows & dam-break
Hydrodynamic modeling
Design flood estimation
Includes extreme rainfall & climate-change scenarios
Spillway capacity & safety margins
Redundancy & freeboard
Early warning & monitoring
Sensors, telemetry, sirens, evacuation plans
Control room & operational protocols
Automated gates, emergency actions
Resilience & Safety Margins
Design against extreme events • Redundancy
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🌊
📈
🛡️
📡
🖥️
Flow: identify GLOF sources → simulate peak flows & dam-break → determine design flood (incl. climate extremes) → provide spillway & early warning. Emphasize redundancy & operational response.
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Icons are illustrative. For operational use, couple models with real hydrologic and glaciologic data.
4️⃣ Timeline — Project Schedule vs Monsoon Windows & Climate Risks
5-year horizontal timeline (2025–2030) with monsoon overlays and climate icons
2025–26
2026–27
2027–28
2028–29
2030 (Commissioning)
Site prep, tunneling begins
Dam foundation & powerhouse excavation
Dam structure rise & headrace completion
Turbine installation & testing
Commissioning target — 2030
Climate risks:
☔ Rainfall extremes
🧊 Glacial melt / GLOF
🌋 Landslides
⚠️ Seismic activity
Project summary
Capacity: 2,220 MW • Expected generation: 8,402 million units/year
Estimated cost: ₹24,942 crore
Monsoon (June–Sept) shown each year as blue windows — schedule plans heavy outdoor civil works outside these windows where possible
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Timeline is illustrative. Use project controls and local monsoon forecasts for operational planning.
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