Hydropower projects can reduce landslide and erosion risks by investigating unstable ground before work begins, controlling water and disturbed soil during construction, stabilizing slopes according to how they could fail, and managing reservoir levels and sediment over the facility’s life. The right measures depend on local geology, groundwater, rainfall, slope conditions and project operations; no single treatment works everywhere.
How do hydropower projects create landslide and erosion risks?
Risk can arise at several stages, not only while a dam or powerhouse is being built. Excavation, blasting, tunnelling, access roads, vegetation clearance and spoil placement can expose soil, change slope shape or redirect water. Those changes can increase erosion or contribute to slope instability, particularly where ground is already susceptible.
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Reservoir filling changes saturation and groundwater conditions along the shoreline. During operation, changing water levels can expose some slopes to repeated wet-dry cycles. These effects depend on the site and should be assessed rather than assumed to occur uniformly around a reservoir.
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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Erosion and landslides are related but distinct. Erosion detaches and transports soil or rock, often through runoff; slope failure is downhill movement of a mass of material. Erosion can undercut or steepen a slope, while a landslide can carry a large volume of sediment into a reservoir or river.
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What should teams investigate before choosing controls?
Start with the ground and the ways water moves through it. The IFC/World Bank’s 2018 hydropower Good Practice Note recommends surveys of soil and geological conditions at future reservoir margins to identify formations and areas prone to erosion or landslides. The same principle applies to construction areas: investigate before deciding where to excavate, place spoil or build access works.
Site investigations and mapping should establish existing signs of instability, soil and rock conditions, slope geometry, groundwater conditions and plausible failure mechanisms. Geotechnical analysis can then help determine whether the practical response is to avoid an area, alter the design, manage drainage, stabilize a slope or monitor it more closely. Spatial mapping can also help prioritize vulnerable slopes and catchments rather than treating every location as equally risky.
Assess the whole pathway of a potential failure: where water and sediment could travel, and whether a reservoir, river, road, work area or downstream community could be affected. The Kambarata-1 draft catchment and reservoir-rim plan, dated 11 August 2025, is a project-specific example of planning around catchments and reservoir margins; it is not a universal standard.
Which controls help during construction?
Construction controls should address both the disturbed ground and the water that reaches it. Concentrated runoff can erode cuts, fills and exposed soil; poorly drained spoil can also create instability or send sediment into waterways. Controls need inspection and maintenance as the work and site conditions change.
- Manage surface water: use drainage and runoff controls to keep concentrated flows from scouring exposed slopes, cuts and fills.
- Protect exposed ground: cover or stabilize disturbed soil and stockpiles as appropriate, and use sediment controls where they fit the site and the flow path.
- Place spoil deliberately: put excavated material in engineered locations with suitable drainage instead of leaving it on vulnerable slopes or where it can enter a river or reservoir.
- Stabilize work areas: restore or otherwise stabilize disturbed land as work progresses, and inspect areas affected by blasting for signs of change.
- Adapt inspection to conditions: increase attention during periods of elevated rainfall risk where appropriate, and repair or adjust controls when they are damaged or no longer working as intended.
The World Bank construction environmental management plan and the Kambarata-1 draft plan describe project-level management approaches. Their measures are examples to adapt through site-specific design, not a guarantee that a particular control will suit every hydropower site.
When can vegetation help stabilize a slope?
Vegetation can be useful in suitable shallow-instability settings. Roots may reinforce shallow soil, and plants may partly relieve excess water pressure. The World Bank hydropower climate toolkit cautions that these effects should be examined and quantified through expert geotechnical analysis, including consideration of soil-root interactions.
Vegetation is therefore one possible part of a stabilization strategy, not a substitute for investigating the failure mechanism. A deeper or more complex failure may require engineered measures designed through geotechnical analysis. The choice should reflect the ground conditions, expected water pressures, slope geometry and maintenance needs.
How should reservoir margins and operations be managed?
Before filling, investigate and map potentially unstable reservoir margins. Where analysis identifies a concern, the IFC/World Bank Good Practice Note recommends stabilizing susceptible areas as needed and considering reservoir operating adjustments to limit wet-dry cycles on potentially unstable slopes. Monitoring slope movement and relevant hydrologic conditions can help teams evaluate whether conditions are changing.
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Reservoir-level and drawdown practices should be informed by site-specific slope-failure modelling rather than a generic operating rule. Sediment management also needs a lifecycle plan: the guidance identifies reservoir bathymetry monitoring and, where appropriate, upstream check structures or bypass systems as options to consider. These measures address sediment pathways and accumulation; they do not replace slope investigation or stabilization where those are needed.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How can project teams compare possible measures?
Compare options against the risk they are meant to address, not by assuming one measure is universally best. The following framework reflects the considerations emphasized in the IFC/World Bank guidance and the World Bank climate toolkit.
| Decision factor | Question to resolve |
|---|---|
| Failure mechanism and geology | Is the concern surface erosion, shallow soil movement, or a more complex slope failure, and what do site investigations show about the materials? |
| Slope and groundwater | How do slope geometry and groundwater conditions affect the likelihood and possible form of movement? |
| Project stage | Does the risk arise during construction, reservoir filling or operation, and when should controls or monitoring be in place? |
| Sediment pathway and receptors | Where could eroded material or a slope failure travel, and what could it affect downstream or along the reservoir margin? |
| Durability and upkeep | How will the measure perform over time, and what inspection, maintenance and monitoring will it require? |
| Environmental effects | Could the measure create other impacts, and how will those be assessed alongside the stability and erosion benefits? |
The cited guidance provides recommendations and examples, not a universal ranking of treatments or a transferable percentage reduction in risk. Project-specific effectiveness needs to be established for the site and the conditions being managed.
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