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Seti River

The Seti Gandaki River, commonly known as the Seti River (distinct from the Seti River in far-western Nepal), is a prominent trans-Himalayan river in central Nepal that originates from the snowfields and glaciers surrounding Machapuchare and the Annapurna massif in the Kaski District.^[1]^[2]^[3] It stretches approximately 113 kilometers (70 miles) southeastward, traversing the Pokhara Valley and cutting through the Mahabharat range before merging with the Trishuli River near Devghat in Tanahun District.^[2]^[3]^[4] Named "Seti," meaning "white" in Nepali, the river derives its milky appearance from suspended glacial silt, creating a striking visual contrast in the landscape.^[1]^[2] The river's course is marked by dramatic geological features, including narrow channels as slim as 2 meters wide and depths reaching 20 meters, where it carves deep limestone gorges and periodically vanishes into underground sections within gorges up to 80 meters deep.^[1]^[3] Visible from key bridges in Pokhara such as Mahendra Pul, K.I. Singh Pul, and Prithvi Chowk Pul, it flows south and southeast past the city of Pokhara and Damauli, receiving tributaries like the Madi River near Damauli.^[1]^[3] These subterranean sections and chasms, formed over millennia of erosion, contribute to its reputation as one of Nepal's most mysterious waterways, though it has also been prone to devastating flash floods, such as the 2012 event that claimed over 60 lives and temporarily altered its path.^[2]^[3] Culturally and economically vital, the Seti River serves as the lifeline of Pokhara, Nepal's second-largest city, supporting agriculture, hydropower generation, and diverse tourism activities including white-water rafting, trekking, and sightseeing along its scenic gorges.^[1]^[2]^[3] In Hinduism, it is revered as a holy site embodying Lord Vishnu, with traditions linking it to ancient epics like the Mahabharata—near Damauli, believed to be the birthplace of sage Vyasa—and annual rituals such as Maghe Sankranti and Teej performed on its banks.^[2]^[3] Temples and pilgrimage sites dot its shores, underscoring its enduring spiritual role in Nepali heritage.^[2]

Geography

Course

The Seti Gandaki River originates from the snowfields and glaciers surrounding Machapuchare and the Annapurna massif in the Kaski District of central Nepal.^[1]^[2] It begins at elevations exceeding 4,000 m above sea level, fed by glacial melt and monsoon precipitation.^[3] The river flows generally southeastward for approximately 200 kilometers (124 miles), traversing the Pokhara Valley and carving deep limestone gorges through the Mahabharat Range.^[2] In this mid-course, it features narrow channels as slim as 2 meters wide and depths up to 20 meters, periodically vanishing into underground caves and tunnels.^[1] Visible from bridges in Pokhara such as Mahendra Pul, K.I. Singh Pul, and Prithvi Chowk Pul, it continues south past the city and Damauli, receiving tributaries like the Mardi Khola and Bijaypur Khola.^[1]^[3] The river ultimately merges with the Trishuli River near Devghat in Tanahun District at an elevation of about 300 m, contributing to the larger Gandaki River system and the Ganges Basin.^[2]

River basin

The Seti Gandaki River basin covers an area of approximately 3,140 km² in Gandaki Province, central Nepal, encompassing parts of Kaski, Syangja, and Tanahun districts.^[4] The basin spans diverse physiographic zones, from high Himalayan peaks exceeding 8,000 m near the Annapurna massif to mid-hills and valleys at around 800 m, with a steep elevational gradient driving its hydrology.^[5] Major tributaries include the Mardi Khola (left bank), Bijaypur Khola, and smaller streams like the Harpan Khola, augmenting flow through rain-fed and snowmelt contributions.^[6] The basin's drainage orients southeastward, integrating into the Gandaki system. Climatic patterns are monsoon-dominated, with about 80% of annual precipitation (around 2,000–3,000 mm in the hills) falling between June and September, supplemented by winter snow in upstream areas.^[5]

Hydrology

Discharge and flow regime

The Seti Gandaki River maintains a perennial flow regime, with significant seasonal variations driven by monsoon rainfall and contributions from snowmelt in the Annapurna headwaters. The river is part of the Gandaki basin, with flows monitored at stations such as Damauli in Tanahun District. Studies indicate mean monthly discharges ranging from approximately 18 m³/s in March (dry season minimum) to 248 m³/s in August (monsoon peak), with annual averages estimated around 100–150 m³/s based on hydrological modeling at key outlets.^[7]^[8] Upper reaches feature snowmelt-dominated flows from March to May, contributing 20–30% of annual discharge, while the monsoon period (June to September) accounts for about 80% of yearly flow, with peak discharges exceeding 500 m³/s during heavy rains—such as 543 m³/s recorded in August 2001. Low-flow conditions occur in the winter dry season (November to February), with minimums of 10–20 m³/s sustained by baseflow and groundwater. Approximately 80–85% of total annual flow occurs between May and October.^[9]^[10] Key factors include glacier and snowmelt (declining due to Himalayan warming), monsoon rainfall averaging 3,000–4,000 mm annually in the basin, and aquifer recharge. Climate change projections suggest potential 10–20% reductions in flows, especially in low-flow seasons, from diminished snowpack under scenarios like RCP 4.5.^[7] Discharge monitoring relies on Department of Hydrology and Meteorology (DHM) stations, with models like SWAT used for prediction; variations influence downstream sediment dynamics, as covered in related sections.

Sediment transport

The Seti Gandaki River exhibits high sediment transport due to its glacial origins and steep Himalayan terrain, with the milky appearance from suspended glacial silt noted in the introduction. The basin area is approximately 2,900–3,100 km², contributing to significant erosion and sediment yields estimated at several million tons annually, dominated by suspended load (80–90%) from weathering of Lesser and Greater Himalayan rocks, including limestones and dolomites. Bedload is mobilized in gorges via scouring and landslides.^[11]^[4] Monsoon flows intensify transport, leading to aggradation in lower valleys and pulses from landslides in narrow gorges. Erosion rates in mid-hill zones reach 1–2 mm/year from rainfall and fluvial action; karst features in the Mahabharat Range influence sediment via dissolution. Specific yield data is limited, but studies indicate high loads comparable to other Gandaki tributaries, with monitoring at DHM stations providing suspended sediment measurements. Climate models project increased yields (up to 20%) from intensified monsoons and erosion.^[12]^[13]

Ecology

Biodiversity

The Seti Gandaki River basin features a diverse range of ecosystems due to its altitudinal gradient from approximately 208 meters to 7,921 meters above sea level.^[14] Upper reaches include alpine meadows and coniferous forests with species such as blue pine (Pinus wallichiana) and rhododendron (Rhododendron arboreum). Mid-elevations transition to mixed broadleaf forests, while lower areas support subtropical sal (Shorea robusta) forests and riverine wetlands that buffer erosion.^[15] The basin's flora is diverse, with riparian zones featuring resilient species like Aegle marmelos and grasses adapted to high sediment loads. Aquatic vegetation includes genera such as Lemna, Eichhornia, and Hydrilla in slower sections.^[16] Terrestrial fauna encompasses mammals like musk deer (Moschus moschiferus) and Himalayan black bear (Ursus thibetanus) in forested slopes. Avian species include over 140 birds, such as the white-capped river chat (Phoenicurus leucocephalus), with migratory waterfowl using wetlands.^[17] Aquatic life supports native fish communities, with studies recording up to 72 species in Gandaki sub-basins, including snow trout (Schizothorax spp.) in upper cold waters and mahseer (Tor putitora) in deeper pools. Invertebrates and amphibians, like the marbled cascade frog (Amolops marmoratus), inhabit fast-flowing tributaries.^[18]^[19] Biodiversity is supported in protected areas like the Annapurna Conservation Area in upper reaches, promoting habitat connectivity. The basin contributes to regional corridors for species such as leopards in the Gandaki system.^[15]

Environmental threats

The Seti River, particularly the Seti Gandaki in Nepal's Gandaki Province, faces multiple environmental threats that compromise its ecological integrity. Climate change exacerbates these challenges through glacier retreat in the Annapurna range, which contributes to the river's headwaters and increases the risk of glacial lake outburst floods (GLOFs).^[20] Projections indicate that low flows could decrease by 15.5% to 19.3% under RCP 4.5 and 8.5 scenarios, respectively, due to reduced baseflow from accelerated snowmelt and altered precipitation patterns.^[21] Erratic monsoons may heighten flooding risks, with streamflow potentially rising up to 61% during monsoon periods, while warmer temperatures—projected to increase by 1.10–5.44°C in minimums by 2100—stress aquatic species by altering thermal regimes and oxygen levels.^[20] Pollution from anthropogenic sources further degrades water quality in the mid-basin. Agricultural runoff introduces pesticides, fertilizers, and trace elements such as zinc (up to 264.2 µg/L post-monsoon), lead, copper, and cadmium, primarily during pre- and post-monsoon seasons when dilution is minimal.^[22] Untreated sewage from urban settlements, including areas near Pokhara, elevates nutrient levels and contaminants like zinc near landfill sites, contributing to anthropogenic pollution alongside geogenic sources.^[22] In upper reaches, siltation from informal mining and industrial effluents adds suspended solids, though mining-specific impacts remain under-documented in the basin.^[22] Habitat loss, driven by land use changes, intensifies soil erosion and sedimentation. In the Gandaki Basin, forest cover increased slightly from 32.47% in 1990 to 33.22% in 2015, but urbanization expanded, converting 29.19 km² of agricultural land to built-up areas in the Seti watershed near Pokhara between 1990 and 2013. These changes, along with infrastructure development and road construction, promote downstream sedimentation that affects spawning grounds.^[15]^[20] Invasive species pose additional risks, particularly in lower reaches and connected wetlands around Pokhara. Water hyacinth (Eichhornia crassipes) proliferates in stagnant areas of the Lake Cluster of Pokhara Valley, which drains into the Seti Gandaki, blocking water flow and altering habitats.^[23] This invasive facilitates the spread of introduced exotic fish like Nile tilapia (Oreochromis niloticus), which compete with and prey on native species, contributing to biodiversity declines in the riverine ecosystem.^[24] Monitoring efforts reveal ongoing ecological declines, limited by sparse gauging stations across the basin. Studies indicate a significant reduction in fish abundance and diversity over the past 25–35 years in the Seti Gandaki, linked to sedimentation from substrate extraction and pollution, which destroys habitats and lowers dissolved oxygen levels. As of 2025, intense fishing pressure and dams contribute to species loss, with calls for better conservation in Gandaki rivers.^[19]^[25] Hydropower dams further amplify sedimentation issues by trapping upstream sediments, leading to sharp population declines in migratory species basin-wide.^[26]

Human uses

Hydropower and infrastructure

The Seti Gandaki River supports several hydropower projects, contributing to Nepal's electricity generation. A notable example is the 1.5 MW Seti Hydropower Station, a run-of-the-river facility commissioned in 1985 at Nadipur in Pokhara, utilizing water from the Seti Gandaki for local power supply. Larger projects include the 22 MW Seti Khola Hydropower Project, a run-of-the-river scheme under construction in Sardikhola, Kaski District, expected to generate 133 GWh annually upon completion.^[27] ^[28] The most significant is the 140 MW Tanahu Hydropower Project, a storage-type facility located near Damauli in Tanahu District on the Seti River, approximately 150 km west of Kathmandu. It features a 133 m high dam, a reservoir covering about 250 ha, and an underground power station, designed to produce 490-588 GWh annually, with peaking capabilities. As of late 2024, the project was 63% complete, with commissioning expected in 2026; it is developed by Tanahu Hydropower Limited in partnership with the Nepal Electricity Authority, Asian Development Bank, Japan International Cooperation Agency, and others, at a cost of $505 million.^[29] ^[30] ^[31] These projects face challenges such as seismic risks in the Himalayas, requiring designs for extreme events, and environmental impacts including downstream flow alterations and resettlement of affected communities (e.g., ~3,500 people for Tanahu). Supporting infrastructure includes transmission lines integrating into the national grid and access roads.^[32]

Irrigation and settlements

The Seti Gandaki River plays a vital role in irrigation and agriculture within its basin, primarily through monsoon flooding that replenishes paddy fields and supports local canal systems in the Pokhara Valley and Tanahu areas. While specific irrigation projects on the main stem are limited, the river contributes to broader Gandaki basin schemes irrigating thousands of hectares for crops like rice, maize, and wheat in the lower reaches, and millet, potatoes, and vegetables in the hilly upstream areas. Watershed management efforts help mitigate soil erosion and enhance dry-season water availability, though the basin's agriculture remains largely rain-fed.^[33] ^[34] Human settlements along the Seti Gandaki are concentrated in the Pokhara Valley, where the river serves as a key water source for the city's ~520,000 residents (as of 2021 census), supporting domestic needs, agriculture, and industry. Riverside communities in Kaski and Tanahu districts, including Damauli (population ~50,000), rely on the river for drinking water via community-managed piped schemes and springs, serving tens of thousands. Traditional farming villages dot the banks, with flood control measures like embankments protecting urban and rural areas from seasonal inundations, as seen in the 2012 flash flood that affected settlements near Pokhara. ^[35] Challenges include dry-season flow reductions, exacerbating water scarcity for irrigation and households, and climate change projections of 10-20% decreased winter flows by mid-century, heightening flood and drought risks for basin communities. Upstream-downstream water allocation issues also arise amid growing urban demands in Pokhara.^[34] ^[36]

History and significance

Geological and historical context

The Seti Gandaki River originates from the snowfields and glaciers of the Annapurna massif and Machapuchare in central-western Nepal's Kaski District, flowing southeast through diverse geological formations shaped by the Himalayan orogeny. This ongoing tectonic process, driven by the collision of the Indian and Eurasian plates starting around 50 million years ago, has uplifted the region and facilitated the river's incision through metamorphic and sedimentary rocks, including the Greater Himalayan Crystalline Complex and Lesser Himalayan Sequence. In the Pokhara Valley, the river has deposited vast quantities of sediment over millennia, contributing to the formation of the valley's lakes through moraine dams from Pleistocene glaciations and episodic glacial lake outburst floods.^[2]^[3] The river's path features dramatic karst landscapes in the mid-reaches, with limestone and dolomite dissolution creating deep gorges, subsurface tunnels up to 80 meters deep, and sinkholes, particularly evident around Pokhara. Tectonic activity along faults like the Main Central Thrust influences ongoing erosion, with incision rates in the central Himalaya estimated at 1-5 mm per year based on terrace dating. Historical evidence from sediment cores in the Pokhara Valley indicates fluctuating monsoon patterns over the Holocene, with stronger precipitation around 4,000 years ago promoting sediment accumulation and early settlements.^[1]^[3] Significant historical events include massive debris flows, such as one approximately 800 years ago that deposited a 100-meter-high wall of material, altering the river's course. In modern times, the river was first descended by raft in June 1971 by explorers Daniel C. Taylor and Jennifer Ide. The most devastating recent event was the May 5, 2012, flash flood triggered by an avalanche and landslide near Annapurna, which surged through the Seti Gandaki, killing 72 people, destroying settlements, and depositing thick sediment layers in the Pokhara Valley. British surveys in the 19th century under the Great Trigonometrical Survey of India mapped the river as part of broader Himalayan explorations, while 20th-century floods, including monsoon-enhanced debris flows in the 1960s, have periodically damaged infrastructure like bridges near Pokhara.^[3]^[37]

Cultural and economic role

The Seti Gandaki River holds profound cultural significance in Nepali Hinduism, revered as an embodiment of Lord Vishnu and linked to ancient epics like the Mahabharata. Near its confluence with the Trishuli at Devghat in Tanahun District, the area is believed to be the birthplace of sage Vyasa, author of the Mahabharata, making it a major pilgrimage site for rituals and ancestral worship. Local traditions include riverbank festivals such as Maghe Sankranti and Teej, where devotees perform offerings, bathing for purification, and cremations, reflecting the river's spiritual role in the Gandaki basin's heritage. Temples like Bindhyabasini in Pokhara and sites along the banks underscore its integration into regional devotional practices.^[2]^[3] Economically, the river has long supported livelihoods in the Pokhara Valley through sediment-rich floodplains enabling agriculture, though its primary modern contributions lie in tourism and emerging hydropower. As a key attraction in Nepal's tourism hub, it draws visitors for white-water rafting, gorge viewing from bridges like Mahendra Pul, and trekking, boosting local economies since the 1970s. Hydropower development includes the operational 22 MW Seti Khola project and the under-construction 140 MW Tanahu Hydropower Project on the lower Seti Gandaki near Damauli (as of 2025), which aims to generate renewable energy for national grids and exports, with potential annual output supporting regional growth. These initiatives, alongside ecotourism, highlight the river's role in sustainable development, though flood risks continue to shape human interactions and community resilience efforts.^[1]^[2]^[29]^[27]

References

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Seti River | Pokhara - Nepal Tourism Board
The Seti River cuts through the Mahabharat range, disappearing in caves, is very narrow but deep, and originates from the Annapurna Massif.Missing: facts | Show results with:facts
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Seti River: Nepal's Mysterious White River | Top Nepal Information
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Seti Gandaki River - Seti River in Nepal - Outfitter Nepal
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[PDF] This is the accepted manuscript version of the contribution published ...
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[PDF] Concept-Environmental-and-Social-Review-Summary-ESRS-Nepal ...
Oct 20, 2021 · The town is situated on the bank of the Seti River, also known as west Seti. The river originates from the twin peaks of Api-Nampa ...Missing: origin | Show results with:origin
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Api Nampa Conservation Area
Api Nampa Conservation Area occupies 1903 sq km of Darchula district varies in altitudes from 539 to 7132 meters.
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[PDF] Nepal: West Seti Hydroelectric Project - Asian Development Bank
The Project is located on the Seti River in the FWDR. The dam site is located 82 kilometers (km) upstream of the confluence of the Seti and Karnali rivers, ...
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[PDF] A Case Study of Karnali River Basin
The 202 Km long, Seti River drains the western part of the catchment and the 264 Km long Bheri River drains the eastern part. The geographical location of the ...
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Seti's gorgeous gorges | Nepali Times
Dec 7, 2018 · The most stunning gorge in the Himalaya is located on the West Seti river on the trail from Simikot to Chainpur.Missing: Mahabharat karst caves
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West Seti Hydropower Project: Key Facts, Timeline, and Significance
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Apr 9, 2020 · The Seti river contributes 11 Mt/yr and the. Budhiganga, a left-hand tributary to the Bheri adds another 12 Mt/yr (the Budhiganga is notable for.
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Aug 6, 2025 · The Seti flows through four distinct terranes, starting with the Tethyan sedimentary series (TSS) and Greater Himalayan series (GHS).
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None
Summary of each segment:
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Freshwater biodiversity in western Nepal: A review
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Impacts of Climate Change and Land Use Change on Streamflow
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Climate change impact on water balance and hydrological extremes ...
... catchment area of 7,427 km2. Facing south with the slant of the Himalayas, the ... Basin in India and the West Seti River Basin in Nepal, respectively.
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Seasonal Variations and Health Risk Assessment of Trace Elements ...
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Nepal's water hyacinth helps exotic fish invade, harming native ...
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Commissioned in 1985 AD at Nadipur in Pokhara, Nepal, Seti Hydropower Station has an installed capacity of 1.5 MW. Water from the Seti Gandaki River is ...
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[36]
Public hearings planned for long-stalled West Seti hydro project
Oct 31, 2025 · The proposed dam will be 195 metres tall and 433 metres long, and will be built using concrete-faced rockfill technology.
[37]
PDA drafting for West Seti Hydro begins | The Annapurna Express
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[38]
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Impact of climate change and watershed interventions on water ...
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Geological setting of the Seti river basin on a shaded-relief map. The...
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Seti River – Er. Pravin Aryal
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Fluvial incision and tectonic uplift across the Himalaya of Central ...
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Governance of spring-dependent community water supply schemes ...
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