5. Hydropower tunnel operations

Nepali authorities report that approximately 933 workers remain unaccounted for at 11 flood-affected hydropower projects across Rasuwa and Nuwakot, with many believed to be inside tunnels blocked by mud and debris. Trishuli 3A and 3B are among the key rescue sites. The Nepal Army is leading operations, using controlled blasts, excavators and search lights, supported by Indian and Chinese tunnel specialists at the Nepal government’s request.

• Rasuwagadhi (111 MW): the project tunnel was searched to a depth of about 225 m (250 m tunnel) using drones; the Nepal Army and the Prime Minister’s Secretariat reported no people found inside. Approximately 93 workers associated with this project — including the project chief, employees and workers — remain missing.
• Upper Trishuli-1: project-level reporting indicates a large number of workers missing, with a portion believed to be inside the project tunnel. These project-level figures are provisional and subject to reconciliation.
• Recoveries: three bodies were reported recovered after teams entered two tunnels; other sections remained blocked by mud and were still being searched.

Status wording. NESRA reports these workers as unaccounted for / believed trapped. NESRA does not publish survivor estimates and does not describe people as “trapped alive” unless an authority explicitly confirms it.

6. Access & transport

• Prithvi Highway (Muglin–Kathmandu): completely blocked at Krishnabhir (Dhading) following flood-induced road subsidence and river erosion; the site is under technical assessment and reopening is not expected to be immediate. Alternative routes are carrying diverted traffic.
• Galchi–Malekhu bridges: the Trishuli bridge at Phurke Khola (Malekhu) was washed away, and two further bridges between Galchi and Malekhu were damaged.
• Dhunche: the alternative light-vehicle route via Kathmandu–Tokha–Kalikasthan remains open, with caution on risky sections.
• Primary Rasuwa corridor: the Betrawati–Rasuwagadhi / Timure–Syabrubesi route remains severely damaged and not open end-to-end; the Rasuwagadhi border road is not open.
• Bridges (restoration): the government has sought approximately 42 Bailey bridges from India and China to restore connectivity. These are requests/pledges — not bridges confirmed delivered or installed.

Physical condition (state of the structure) is shown separately from passability (whether an authority has established the route is open). Confirm current status with Traffic Police before travel.

7. Utilities & connectivity

• Electricity (NEA): the Nepal Electricity Authority reports power restored across most areas of Kalika and Naukunda rural municipalities and at Dhunche, Bharkhu and Gosainkunda, with repair work continuing in remaining areas. The flood affected roughly 10% of national generation capacity and damaged six major hydropower/transmission facilities (Rasuwagadhi, Chilime, Trishuli 3A, the Trishuli 3B Hub 220 kV substation, Trishuli Hydropower Station and Devighat). This is partial restoration, not full restoration.
• Telecommunications: restoration of mobile network infrastructure is continuing; tower/base-station restoration is not the same as full population coverage or full service availability. Consult operators for current service status.
• Fuel / logistics: with the Prithvi Highway blocked, alternative fuel-supply routing has been reported to maintain supply continuity toward Kathmandu.
• Victim identification: Nepal Police has reportedly requested DNA samples from relatives of missing persons to assist identification — relevant for affected families and foreign-national cases.

8. Earth Observation — NESRA Rapid EO Assessment v1

NESRA Rapid EO Assessment v1 remains the latest NESRA EO product — no newer NESRA satellite analysis has been produced for this brief. It is a rapid, cloud-limited Sentinel-2 flood/debris-path and exposure assessment (imagery 27 August 2026).

• 101.6 km river corridor assessed (92 km measured; 4.1 km under solid cloud).
• 3,216 buildings, 11.5 km of major road and 62 bridges intersect the mapped flood/debris path.
• Exposure is not verified damage; areas under cloud must not be read as unaffected — “no evidence” is not “no flooding”. Treat the mapped extent as an upper bound requiring field or official verification.

Earth Observation analysis led by Michael Hylind, NESRA Earth Observation Lead.

9. External emergency mapping

International Charter (activation 1052): eight external products are listed, spanning Rasuwa pre/post mapping and mudflow/rockflow extent, Nuwakot pre/post damage imagery and a Timure–Syabrubesi impact map. These are external products, not NESRA-generated analysis.

Copernicus EMS (EMSR927): Rapid Mapping products have been released across multiple areas of interest. Within its mapped Syapru Besi area, Copernicus EMS reported more than 240 buildings destroyed and 32 damaged (WorldView-3, 27 August 2026).

Sentinel Asia: value-added mapping products (including Planet-based mapping and an EOS-RS Sentinel-1 damage-proxy map) have been shared through the Sentinel Asia activation.

Do not conflate datasets. External emergency-mapping figures are findings for specific mapped areas and are not NESRA findings; the Copernicus destroyed-building figure is not comparable with NESRA’s 3,216 exposed-building figure (exposure ≠ verified damage) and must not be generalised to the whole corridor.

10. What we know

• NDRRMA reported 903 bodies/human remains recovered, ~4,247 unaccounted for (incl. 592 foreign nationals) and 10,451 rescued at 31 Aug 09:00 NPT; 267 injured (156 discharged); 20,819 security personnel; 411 helicopter flights (3,344 Nepalis + 252 foreign airlifted).
• Approximately 933 workers are unaccounted for at 11 flood-affected hydropower projects; the Rasuwagadhi (111 MW) tunnel was searched with no people found inside, and ~93 of its workers remain missing.
• The Nepal Army leads tunnel operations with Indian and Chinese specialists, using controlled blasts, excavators and search lights; three bodies were recovered from two tunnels.
• One barrier lake near the border was reported fully drained; DHM has issued flood/rainfall warnings across several downstream districts.
• The Prithvi Highway remains completely blocked at Krishnabhir; the alternative light-vehicle route to Dhunche remains open.
• The NEA reports partial power restoration across several Rasuwa municipalities.

11. What remains uncertain

• Casualty and missing reconciliation: the exact number missing is not settled; different government reporting pipelines circulated during 31 August, and some later, higher recovered-body and lower missing figures attributed to a government/Prime Minister statement could not be independently reconciled at this cutoff. NESRA has therefore retained the verified NDRRMA 09:00 snapshot and has not merged unverified later totals.
• Tunnel outcomes: the status of workers inside blocked tunnels is unresolved; NESRA does not publish survivor estimates.
• Secondary hazard: stability of glaciers, landslide deposits and any new impoundments in the source zone remains under assessment.
• Essential services: precise grid-restoration and telecom-coverage percentages circulated in some statements are not independently confirmed here; tower restoration ≠ full coverage.
• Bridges / logistics: the composition of pledged Bailey bridges (domestic, Indian and Chinese) and delivery/installation status are not confirmed as operational infrastructure.
• NESRA EO / YIL: a validated final NESRA flood extent and final YIL geospatial products are pending.

12. Sources

• NDRRMA 31 August 09:00 NPT search, rescue and relief update — impact, missing, rescued, injured, personnel, aerial operations (via The Kathmandu Post, OnlineKhabar, Radio Nepal, RSS).
• Reuters / Associated Press and Al Jazeera — hydropower-tunnel operations, 933 workers unaccounted, Indian/Chinese specialists, controlled blasts.
• Nepal Army / Prime Minister’s Secretariat via The Week / RSS — Rasuwagadhi tunnel search concluded, ~93 workers missing.
• The Kathmandu Post — barrier lake fully drained (Chinese statement); Prithvi Highway severed at Krishnabhir; Galchi–Malekhu bridges.
• Nepal Electricity Authority via Radio Nepal / Nepal News — power restoration and hydropower/transmission damage.
• DHM — current flood/rainfall warnings and river monitoring (dhm.gov.np).
• International Charter activation 1052; Copernicus EMS EMSR927; Sentinel Asia — external emergency mapping.
• NESRA Rapid EO Assessment v1 — NESRA EO dashboard.

13. NESRA methodological caveat

FloodWatch provides Earth Observation and geospatial situational analysis. NESRA distinguishes Earth Observation-derived exposure from verified damage, and distinguishes an official warning from a technical assessment and from a satellite/remote-sensing interpretation. Impact figures are provisional and attributed to their originating authorities; recovered bodies/human remains are not equated with a final confirmed death toll. NESRA does not maintain an independent missing-person registry and does not issue warnings. FloodWatch supports situational awareness and does not replace official warnings, emergency instructions or authoritative government assessments.

५. जलविद्युत् सुरुङ उद्धार

अधिकारीहरूका अनुसार रसुवा र नुवाकोटका 11 जलविद्युत् आयोजनामा करिब 933 कामदार सम्पर्कविहीन छन्, धेरै हिलो/माटोले अवरुद्ध सुरुङभित्र रहेको आशङ्का छ। त्रिशूली 3A र 3B मुख्य उद्धार स्थलमध्ये छन्। नेपाली सेनाले नियन्त्रित विस्फोट, एक्साभेटर र सर्चलाइट प्रयोग गर्दै भारतीय र चिनियाँ सुरुङ विज्ञको सहयोगमा नेतृत्व गरेको छ।

• रसुवागढी (111 MW): सुरुङ करिब 225 m सम्म (250 m सुरुङ) ड्रोनमार्फत खोजियो; नेपाली सेना र प्रधानमन्त्री सचिवालयले भित्र कोही फेला नपरेको जनाए। यस आयोजनासँग सम्बन्धित करिब 93 कामदार सम्पर्कविहीन छन्।
• माथिल्लो त्रिशूली-1: आयोजनास्तरीय रिपोर्टअनुसार धेरै कामदार सम्पर्कविहीन, केही सुरुङभित्र रहेको आशङ्का। यी संख्या प्रारम्भिक र मिलानयोग्य छन्।
• बरामद: दुई सुरुङमा पसेपछि 3 शव बरामद; अन्य खण्ड हिलोले अवरुद्ध।

अवस्था शब्दावली। NESRA यी कामदारलाई सम्पर्कविहीन / अवरुद्ध सुरुङमा रहेको आशङ्का भन्छ। NESRA जीवितको अनुमान प्रकाशित गर्दैन र आधिकारिक पुष्टिविना “जीवित अवस्थामा अवरुद्ध” भन्दैन।

६. आवागमन तथा यातायात

• पृथ्वी राजमार्ग (मुग्लिङ–काठमाडौं): बाढीजन्य सडक भासिने र नदी कटानपछि कृष्णभीर (धादिङ) मा पूर्ण अवरुद्ध; स्थल प्राविधिक मूल्याङ्कनमा, तत्काल खुल्ने अपेक्षा छैन। वैकल्पिक मार्गमा यातायात मोडिएको।
• गल्छी–मलेखु पुल: मलेखुको फुर्के खोला त्रिशूली पुल बगायो, गल्छी–मलेखुबीच थप 2 पुल क्षतिग्रस्त।
• धुन्चे: काठमाडौं–टोखा–कालिकास्थान हुँदै वैकल्पिक हलुका सवारी मार्ग खुला।
• मुख्य रसुवा मार्ग: बेत्रावती–रसुवागढी / टिमुरे–स्याफ्रुबेसी गम्भीर क्षतिग्रस्त, अन्त्यसम्म बन्द; रसुवागढी सीमा मार्ग खुलेको छैन।
• पुल (पुनर्स्थापना): सरकारले भारत र चीनसँग करिब 42 Bailey पुल माग गरेको। यी माग/प्रतिबद्धता हुन् — जडान भइसकेका होइनन्।

भौतिक अवस्था र आवागमन अलग देखाइन्छ। यात्रा अघि ट्राफिक प्रहरीसँग पुष्टि गर्नुहोस्।

७. सेवा तथा सञ्चार

• विद्युत् (NEA): कालिका र नौकुण्ड गाउँपालिकाका धेरै क्षेत्र तथा धुन्चे, भर्खु र गोसाइँकुण्डमा विद्युत् पुनर्स्थापना, बाँकीमा मर्मत जारी। बाढीले राष्ट्रिय उत्पादनको करिब 10% प्रभावित र 6 प्रमुख जलविद्युत्/प्रसारण संरचना (रसुवागढी, चिलिमे, त्रिशूली 3A, त्रिशूली 3B हब 220 kV सबस्टेसन, त्रिशूली जलविद्युत् केन्द्र, देवीघाट) क्षतिग्रस्त। यो आंशिक पुनर्स्थापना हो।
• दूरसञ्चार: नेटवर्क पूर्वाधार पुनर्स्थापना जारी; टावर पुनर्स्थापना पूर्ण कभरेज वा पूर्ण सेवा बराबर होइन।
• इन्धन / लजिस्टिक: राजमार्ग अवरुद्ध हुँदा काठमाडौंतर्फ आपूर्ति निरन्तरताका लागि वैकल्पिक इन्धन ढुवानी व्यवस्था।
• शव पहिचान: नेपाल प्रहरीले पहिचानमा सघाउन आफन्तबाट DNA नमुना माग गरेको रिपोर्ट।

८. पृथ्वी अवलोकन — NESRA Rapid EO Assessment v1

NESRA Rapid EO Assessment v1 नै NESRA को पछिल्लो EO उत्पादन हो — यस संक्षेपका लागि नयाँ NESRA उपग्रह विश्लेषण गरिएको छैन। यो बादल-सीमित Sentinel-2 flood/debris-path तथा exposure मूल्याङ्कन हो (तस्बिर 27 अगस्ट 2026)।

• 101.6 km नदी मूल्याङ्कन (92 km मापन; 4.1 km घना बादलमुनि)।
• 3,216 भवन, 11.5 km मुख्य सडक र 62 पुल नक्साङ्कित मार्गसँग intersect।
• Exposure प्रमाणित क्षति होइन; बादलमुनिको क्षेत्रलाई अप्रभावित नबुझ्नुहोस्।

पृथ्वी अवलोकन विश्लेषण नेतृत्व: Michael Hylind, NESRA EO Lead।

९. बाह्य आपत्कालीन नक्साङ्कन

International Charter (activation 1052): 8 बाह्य उत्पादन — Rasuwa pre/post र mudflow/rockflow extent, Nuwakot pre/post, Timure–Syabrubesi impact map। यी बाह्य उत्पादन हुन्, NESRA का होइनन्।

Copernicus EMS (EMSR927): नक्साङ्कित Syapru Besi क्षेत्रमा 240 भन्दा बढी भवन नष्ट र 32 क्षतिग्रस्त रिपोर्ट (WorldView-3, 27 अगस्ट 2026)।

Sentinel Asia: value-added नक्साङ्कन उत्पादन साझा गरिएको।

तथ्याङ्क नमिलाउनुहोस्। बाह्य संख्या निश्चित क्षेत्रका निष्कर्ष हुन्, NESRA का होइनन्; NESRA को 3,216 (exposure ≠ क्षति) सँग तुलनायोग्य होइनन्।

१०. के थाहा छ

• NDRRMA: 903 शव/अवशेष, ~4,247 सम्पर्कविहीन (592 विदेशीसहित), 10,451 उद्धार (31 Aug 09:00 NPT); 267 घाइते (156 डिस्चार्ज); 20,819 सुरक्षाकर्मी; 411 हेली उडान।
• 11 जलविद्युत् आयोजनामा करिब 933 कामदार सम्पर्कविहीन; रसुवागढी (111 MW) सुरुङमा कोही फेला परेनन्, ~93 कामदार सम्पर्कविहीन।
• नेपाली सेना भारतीय/चिनियाँ विज्ञसहित; 2 सुरुङबाट 3 शव बरामद।
• सीमानजिकको एउटा ताल पूर्ण निकास; DHM ले धेरै जिल्लामा चेतावनी।
• पृथ्वी राजमार्ग कृष्णभीरमा पूर्ण अवरुद्ध; धुन्चे वैकल्पिक मार्ग खुला।
• NEA ले धेरै क्षेत्रमा आंशिक विद्युत् पुनर्स्थापना।

११. के अनिश्चित छ

• मृत्यु/सम्पर्कविहीन मिलान: सम्पर्कविहीनको सही संख्या यकिन छैन; 31 अगस्टमा फरक सरकारी प्रणालीका संख्या प्रचलित रहे, र सरकार/प्रधानमन्त्रीको भनाइमा उल्लिखित पछिल्लो उच्च शव र कम सम्पर्कविहीन संख्या यस समयमा स्वतन्त्र रूपमा मिलान गर्न सकिएन। त्यसैले NESRA ले प्रमाणित NDRRMA 09:00 विवरण कायम राखेको र अप्रमाणित पछिल्लो संख्या जोडेको छैन।
• सुरुङ परिणाम: अवरुद्ध सुरुङका कामदारको अवस्था अनिश्चित; NESRA जीवितको अनुमान प्रकाशित गर्दैन।
• दोस्रो जोखिम: हिमनदी, पहिरो सामग्री र सम्भावित नयाँ अवरोधको स्थिरता मूल्याङ्कनमा।
• अत्यावश्यक सेवा: केही भनाइमा उल्लिखित विद्युत्/दूरसञ्चार पुनर्स्थापना प्रतिशत यहाँ स्वतन्त्र पुष्टि छैन।
• पुल / लजिस्टिक: Bailey पुलको स्रोत र जडान/सञ्चालन अवस्था पुष्टि छैन।
• NESRA EO / YIL: NESRA को अन्तिम प्रमाणित विस्तार र YIL उत्पादन बाँकी।

१२. स्रोतहरू

• NDRRMA 31 अगस्ट 09:00 NPT अपडेट (The Kathmandu Post, OnlineKhabar, Radio Nepal, RSS)।
• Reuters / AP र Al Jazeera — सुरुङ उद्धार, 933 कामदार, भारतीय/चिनियाँ विज्ञ।
• नेपाली सेना / प्रधानमन्त्री सचिवालय (The Week / RSS) — रसुवागढी सुरुङ खोजी।
• The Kathmandu Post — ताल निकास; पृथ्वी राजमार्ग; गल्छी–मलेखु पुल।
• NEA (Radio Nepal / Nepal News) — विद्युत् पुनर्स्थापना र क्षति।
• DHM — हालको चेतावनी र नदी निगरानी (dhm.gov.np)।
• International Charter 1052; Copernicus EMSR927; Sentinel Asia।
• NESRA Rapid EO Assessment v1 — NESRA EO dashboard।

१३. NESRA विधिगत टिप्पणी

FloodWatch पृथ्वी अवलोकन तथा भू-स्थानिक स्थिति विश्लेषण दिन्छ। NESRA exposure र प्रमाणित क्षति छुट्याउँछ, र आधिकारिक चेतावनी, प्राविधिक मूल्याङ्कन र उपग्रह व्याख्या छुट्याउँछ। संख्या प्रारम्भिक र स्रोत-आधारित छन्; फेला परेका शव/अवशेष अन्तिम मृत्यु संख्या होइनन्। NESRA स्वतन्त्र सम्पर्कविहीन दर्ता राख्दैन र चेतावनी जारी गर्दैन। FloodWatch आधिकारिक चेतावनी वा सरकारी मूल्याङ्कनको प्रतिस्थापन होइन।